2DubTech
Junior
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« on: May 29, 2011, 10:33:09 pm » |
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So I just got my 1915 turbo running. I have a Holley 500 2bbl. It will start and run, kind of. If I rev the engine it will accelerate and rev no problem. The problem I am having is it won't maintain an rpm or an even idle. It is like the only way to keep it running is to constantly goose the throttle. If i try to hold it at any rpm it will just die after about 4 seconds like it is runnig out of fuel. I have ajusted the float level to the sight hole. Any thoughts? First turbo build.
STF motor.
1915cc
7.7 compression
W125 w/1.25s
Holley 500cfm 2bbl. (rebuilt, boost referenced, adjust-a-jet)
Draw through
Locked out msd dizzy @ 20 deg advance.
Holley blue pump with Holley regulator (8psi set at)
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A&G's Racing
Build 4 torque talk about horsepower
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VdanielW
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« Reply #1 on: May 30, 2011, 01:16:05 pm » |
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I had to set my idle jets turned out about 3/4 of a turn out, with that size of a cam you may need to keep the idle up about 1200-1400 to keep it from loading up. Where is your adjust-a-jet set at? About 2 1/4- 2 1/2 turns out should be in the right area. Your timing sounds a bit low as well. Are you running a timing retard box? I would suggest a mallory hyfire 685 box. I set my timing at 30 deg's locked and let it retard timing as is need (pump gas close to 2 deg's/1psi, race fuel 0.1deg's/1psi). With no box though I would start at 24 deg's and listen for pinging. Also, I set my fuel pressure at 5-6psi.
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2DubTech
Junior
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Posts: 209
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« Reply #2 on: May 30, 2011, 06:26:59 pm » |
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I turned the idle jets out 2 1/2 turns (initially only about 1 1/4 turns out) richened up the adjust-a-jet 1 1/2 turns, picked up the idle to about 1300rpm, advanced timing to 24 degrees and dropped the fuel pressure to 6psi and now it runs at any rpm without dying. Thanks for the help, now I just need to drive it with my LM1 and see what my afr is at.
I know the cam is kind of big but it is what I already had. I built this motor out of an all motor setup that I was running. Used as many free/cheap/laying around parts as I could. Would rather blow up this STF turbo motor then a nice big expensive one as my first turbo build.
BTW I have a Mallory HyFire VIal box without the boost retard.
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A&G's Racing
Build 4 torque talk about horsepower
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VdanielW
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« Reply #3 on: May 31, 2011, 12:24:49 pm » |
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With that cam I bet the engine sounds evil at idle. My 1915 had a 120 cam (same cam I'm running in my 2276) and i loved it at idle. What boost are you planning on running? I ran mine at 15psi with 8:1 compression, my 2276 is at 8.2:1 at 12psi. I like the lower boost and higher compression.
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Dave Conklin (Cornpanzers)
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« Reply #4 on: May 31, 2011, 03:48:33 pm » |
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I was afraid of putting too much timing in my car, but Dave Kawell told me that too little timing will create serious heat issues in the heads. As I recall, he suggested 26 degrees as a nice sweet spot, but I will need to dig my notes out to verify (I am 90% sure it was 26 - it wasnt less than that). The drivability of my car improved an enormous amount when I gave it more timing. Try a couple more degrees.
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Cornpanzers!
67 Turbo Beetle
70 911 "S"
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2DubTech
Junior
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Posts: 209
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« Reply #5 on: June 01, 2011, 02:16:22 pm » |
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Yeah it sounds like a drag car at idle. When I first fired it up it echoed through out my block. Trying not to piss of the neighbors too much, lol. I was planning on starting around 5 psi of boost and good up a little at a time. No more than 15psi (stock head studs  ) I will try the more timing suggestion, it seems to run better with more timing. I am going to go flog on it tonight, haven't had much time this past couple of nights. Again thanks for the help.  Let you guys know how the tuning goes. |
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A&G's Racing
Build 4 torque talk about horsepower
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fiatdude
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« Reply #6 on: June 01, 2011, 05:27:25 pm » |
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OK --- The NUMBER ONE RULE from now on is .. .. ..
CHANGE ONLY ONE THING AT A TIME -- and SMALL CHANGES TOO
-- never ever make multiple changes as you chase the tune on this thing, it might take a little longer to fine tune it, but you'll save $$$$ in the end from not buying Mo' Parts. One little pop and you'll be buying a set of pistons and barrells and a few of these.. .. .. ... ..
Voice of experience here (LMAO .. .. now, not then)
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« Last Edit: June 01, 2011, 05:34:59 pm by fiatdude »
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Karman Sutra-needed to get my butt out of the ghia
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KAFUR1
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« Reply #7 on: June 01, 2011, 09:25:32 pm » |
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Nice rod!
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volksnut
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« Reply #8 on: June 01, 2011, 10:01:45 pm » |
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Let's hear that cam....
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2DubTech
Junior
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Posts: 209
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« Reply #9 on: June 02, 2011, 12:25:06 am » |
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So I went out and ripped on it. I have a 38mm eBay waste gate and an adjustable boost control valve. Anyone have a similar setup? If so how is it routed? I know I must have it installed wrong. If I have a very light throttle and hardly any load it will boost around 4psi if I try to get on it and put the engine under a load then boost will jump way up around 16psi and the engine will detonate (I will get off throttle immediately) I tried looking up how to hook my manual boost controller and waste gate up on the net with no real luck. The waste gate I have has a vacuum port on the top and on the bottom. If anyone has any pictures or a good explanation of the correct way to hook up a manual boost controller and wastegate that would be great, or should I just ditch the adjustable boost control valve? It runs real good on the low boost/light throttle feels like it just wants to take off, feels like a lot of low down torque. Just need to get the boost thing figured out.
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« Last Edit: June 02, 2011, 10:48:25 am by 2DubTech »
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A&G's Racing
Build 4 torque talk about horsepower
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Greg G
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« Reply #10 on: June 05, 2011, 12:15:01 am » |
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the port on the bottom of the waste gate should be plumbed up to the intake manifold after the turbo. You boost adjust should be tee'd in to this line and regulate the pressure to the top of the waste gate. If your waste gate spring is for 16psi, you cannot adjust it any lower, only higher. You may need to get another spring for lower pressure. You can always adjust the pressure up with your boost adjust.
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It runs hard and is a blast to drive!
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2DubTech
Junior
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Posts: 209
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« Reply #11 on: June 05, 2011, 08:21:44 pm » |
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Thanks for the reply. I had it set up "bleeder" style. I had a spring check valve routed into the boost controller, it was backwards and the way I had it setup made it so the waste gate would never open  The waste gate I have is a cheap no name adjustable one from 7-12 psi or maybe 15psi can't remember. Hooked it all up the way you suggested Greg G, worked just fine, thanks a lot  anyway thanks for the responses/help. Got it all situated now, I will try to post pictures/video when I have some time. |
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A&G's Racing
Build 4 torque talk about horsepower
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Turbobug65
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« Reply #12 on: June 07, 2011, 09:21:32 pm » |
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2dubtech, just wondering, do you have any issue with fuel puddling up in your plentum?, sit at idle and then just a regular street driving go from a stop and the engine is loaded up and coughing?
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2DubTech
Junior
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Posts: 209
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« Reply #13 on: June 08, 2011, 12:00:12 pm » |
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No, if it sits at idle for like 2 minutes at a "low" idle of like 1000 rpm it will sputter slightly when you take off. I have it idling at about 1300 rpm now and it will be fine for about 5 minutes idling then it will start loading up again and you will have to either take off and drive or rev it up a little bit. If I had to build this again I would have used a smaller cam......but this is the cam I had and just figured roll it and see what happens . Like I said this is a STF motor that was built with stuff laying around, the only new stuff is the crank and rods, turbo intake, and the exhaust piping used for the intake and exhaust. Everthing else was in "inventory"  |
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A&G's Racing
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Turbobug65
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« Reply #14 on: June 08, 2011, 01:04:30 pm » |
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Right on, I thinly the 4 barrel is worse at loading up. Did you have to turbo prep that carb? I have a similar motor with a 45 DCOE that I've been fighting. My buddy Mike has been telling me for awhile to put a 4 barell on it but I'm afraid it will take the fun out of driving it on the street.
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2DubTech
Junior
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Posts: 209
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« Reply #15 on: June 08, 2011, 03:53:48 pm » |
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Yeah, I had bought the 2bbl. off of ebay. It looked like it came off a running "old" car because it was all oily and greasy. I rebuilt it and let it sit in carb dip for like four days and just cleaned out all the passages and put a Percy's adjust-a-jet on it. I looked all over the web for the "how to" on boost referencing the carb and found a diagram for it and modified it. Once I got the jetting in the ball park and the wastegate figured out (thanks to GregG and VdanielW) it was easy.
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A&G's Racing
Build 4 torque talk about horsepower
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catbox
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« Reply #16 on: June 22, 2011, 02:58:44 pm » |
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How does it run? Or are you out having to much fun with it to care about the internet people that have to live vicariously through you as our projects are not done yet......  |
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2DubTech
Junior
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« Reply #17 on: July 06, 2011, 02:02:45 pm » |
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Runs pretty good...... after messing around with various problems.  The original turbo I had installed I had tried to modify for draw through. It was a K03 turbo off a passat 1.8T engine.......well it lasted about 15 miles then the seal blew and was gussing oil into the intake. Ended up getting an ebay t3/t4 and carbon sealed it. With the new turbo no more smoke. I had to rebuild the intake "t" and put a new header flange on but now it is all good. No smoke no problems. I got the boost thing figured out, thanks GregG, and have only boosted it to 7psi. I haven't even really romped on it yet. I had a 2276 FK-45 wedgeport motor (13.0@100) and this feels faster (may be in my head). The power delivery feels way different. With this turbo setup it does't feel like you are really going that fast but then you realize the stop lights and traffic are coming up wasy quicker than normal and then you look at the speedo and realize that you are going pretty fast. Feels like it has a lot of torque. I have only taken it to about 5500 rpm and it feels like it can pull a lot more. |
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A&G's Racing
Build 4 torque talk about horsepower
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Ohio Tom (DdK)
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« Reply #18 on: July 07, 2011, 11:56:33 am » |
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he he.. wait until you turn up the wick. LOL....
It probably is faster than 13.0's right now.
Power delivery is way different than N/A motors. Takes some getting used to. But, in the end you will not regret the change.
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Ohio Tom Simpson. Home of the Killa' Bee.
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2DubTech
Junior
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Posts: 209
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« Reply #19 on: July 07, 2011, 12:59:46 pm » |
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Yeah for sure, the power delivery is a lot different. I am very glad I made the change, dont get me wrong I love IDA motors and good running all motors BUT man the turbo power is pretty cool. Like I said, the speed may be all in my head, cant wait until I can see what it does at the track. At the beginning of the build I said to myself high 13s would be my goal anything faster would just be gravy.
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A&G's Racing
Build 4 torque talk about horsepower
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Turbobug65
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« Reply #20 on: July 07, 2011, 10:14:45 pm » |
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I've been playing with my BTM and some fuel delivery problems, I just got it 10 lbs on pump gas. Man that's fun, especially setting on the freeway onramp.
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fiatdude
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« Reply #21 on: July 16, 2011, 10:28:38 pm » |
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Karman Sutra-needed to get my butt out of the ghia
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2DubTech
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« Reply #22 on: September 12, 2011, 06:52:48 pm » |
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A&G's Racing
Build 4 torque talk about horsepower
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fiatdude
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« Reply #23 on: September 12, 2011, 08:01:35 pm » |
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With some C-16 and about 20 lbs of boost --- Oh My
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Karman Sutra-needed to get my butt out of the ghia
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2DubTech
Junior
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Posts: 209
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« Reply #24 on: September 12, 2011, 09:01:55 pm » |
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I guess we shall see, I think if I get the launch right then I can probably do it. I would like to see a 12.9. I think that this motor can do it. I am not going to boost a lot, stock head studs. This is a total STF motor, eBay turbo, crappy heads, eBay carb, single relief case. The only thing I "splurged" on was the CB Unitech rods, counterweighted DPR crank and CB valve springs. I pretty much turbo'd my all motor 1915 that I have been running for some time now. Everything else was whatever is the cheapest/laying around. I have been trying to do any drag racing I can, just a little difficult being in Fillmore Ca. not really "close" to any tracks.
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« Last Edit: September 12, 2011, 09:10:48 pm by 2DubTech »
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A&G's Racing
Build 4 torque talk about horsepower
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Dave Conklin (Cornpanzers)
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« Reply #25 on: September 13, 2011, 08:04:36 am » |
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I ran 20+ lbs of boost on stock 10mm head studs. Ran 10.80's.
The 101mph trap speeds suggest that your not making a lot of power. A 200hp aspirated car will trap in the 107 range with a mid 12 sec ET. The potential is there, but you will need to get it off the line like you did in that first run and bump the boost up. Make sure you run good fuel when you twist the boost up.
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Cornpanzers!
67 Turbo Beetle
70 911 "S"
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2DubTech
Junior
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Posts: 209
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« Reply #26 on: September 13, 2011, 11:20:55 am » |
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Yeah I figure that if I can get the launch like I did the first run and get everything just right then I might be able to run a 12.9. I was just comparing this motors MPH to my big motor MPH 13.0@100. The first launch was sweet, the next two sucked. I need some more seat time. I will crank up the boost next time then at the track, obviously with some c-12 or c16. If I can knock it down to a 12.9 to 13.1 consistantly then I will feel this cheap motor has served a purpose |
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A&G's Racing
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2DubTech
Junior
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« Reply #27 on: September 19, 2011, 09:02:17 pm » |
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A&G's Racing
Build 4 torque talk about horsepower
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Dave Conklin (Cornpanzers)
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« Reply #28 on: September 20, 2011, 08:21:58 am » |
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Way to go! Awesome project.
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Cornpanzers!
67 Turbo Beetle
70 911 "S"
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Humpty
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« Reply #29 on: September 24, 2011, 12:29:46 pm » |
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What a great read.... Totally inspired by your efforts....
You said you found a diagram that helped you with the mods to the carb.... Care to share?... I'm starting on the changeover from the DCOE to a Holley 500 this weekend...
Can only hope that I will see similar performance from my lil'hotrod....
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2DubTech
Junior
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« Reply #30 on: September 24, 2011, 04:07:04 pm » |
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http://www.shoptalkforums.com/viewtopic.php?f=3&t=130254That is the link to where I found how to reference my carb. I found it by doing a google search and took me to "the other aircooled site" . I cant take the credit, but it was a good post, detailed pictures. I found an old Holley drawing too that showed similiar directions but being a sketch it was nicer to have pictures. I like the Holley I have, eBay special. Don't really have anything to compare it to though. I would definatly get the adjust-a-jet again though. Easy jetting adjustment, just a turn of a screw. Good luck with the build 
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A&G's Racing
Build 4 torque talk about horsepower
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Humpty
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« Reply #31 on: October 29, 2011, 09:34:12 am » |
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Went the same way as you.... Ebay purchase.... Scored my carb off a remanufacturer in the US.... Scored an adjust'a'jet locally as the Summit purchased one took forever.... Got a spare now! Got the car running today, and is very rich, but pulled a nice idle straight away.... More here if you'd like a read.... http://www.noh2o.org/viewtopic.php?t=28&postdays=0&postorder=asc&start=540 Another question.... What PV are you running? |
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« Last Edit: October 29, 2011, 09:36:26 am by Humpty »
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