Dyno results
Thread Starter
Racer
Joined: Feb 2006
Posts: 367
Likes: 0
From: Harrisburg PA
I have not changed the fuel filter...but i did read your post in the other thread. Im a new vette owner and thought there was an in tank only. I asked the dealer and I think he said some ridiculus price for the filter. What do you guys generally pay? I will change it asap.
Stock fuel pump. During the dyno runs fuel pressure held steady.
There is one small soundbite in the link where the logs are. I will email you them Jesse...bigger ones.
I logged alot of good info tonight and will put it in there also. Still the car would not spin the tires. It goes pretty good but not as strong as it should. Yes im in comp mode. Mounted the boost gage in the ashtray...5-6psi steady.
Hopefully you all can help me sort this out. I chickened out racing a new M3 because I didnt want to get pissed off...
Stock fuel pump. During the dyno runs fuel pressure held steady.
There is one small soundbite in the link where the logs are. I will email you them Jesse...bigger ones.
I logged alot of good info tonight and will put it in there also. Still the car would not spin the tires. It goes pretty good but not as strong as it should. Yes im in comp mode. Mounted the boost gage in the ashtray...5-6psi steady.
Hopefully you all can help me sort this out. I chickened out racing a new M3 because I didnt want to get pissed off...
Pro
Joined: Jun 2003
Posts: 555
Likes: 0
From: Moline IL
Originally Posted by C5A4TT
I asked the dealer and I think he said some ridiculus price for the filter. What do you guys generally pay? I will change it asap.
I tried getting one from the Auto parts store, but it doesn't have the bracket with it, and the GM bracket doesn't fit on the aftermarket filter. It costs a whopping $4 more to get the one from the stealership vs. the auto parts store.
Thread Starter
Racer
Joined: Feb 2006
Posts: 367
Likes: 0
From: Harrisburg PA
I swear the dealer said $80...I will check again.
I put the log files in but damn I need schooled on autotap. Bunch of damn timestamps and the friggin sample rate was too slow. I guess I will try again tomorrow night.
I put the log files in but damn I need schooled on autotap. Bunch of damn timestamps and the friggin sample rate was too slow. I guess I will try again tomorrow night.
Thread Starter
Racer
Joined: Feb 2006
Posts: 367
Likes: 0
From: Harrisburg PA
My tuner says tuning Motron/Siemens 60lb injectors is far easier than 42lbers. Also fuel pressure was good. Air/Fuel was good. No knock. And the car is an 01 not an 03 up which need fuel pumps. But if I need one I will get one.
Is anyone an autotap expert? How do you get rid of all the time stamps?
Is anyone an autotap expert? How do you get rid of all the time stamps?
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Melting Slicks
Joined: Mar 2003
Posts: 3,116
Likes: 10
From: Macomb MI
Originally Posted by C5A4TT
My tuner says tuning Motron/Siemens 60lb injectors is far easier than 42lbers. Also fuel pressure was good. Air/Fuel was good. No knock. And the car is an 01 not an 03 up which need fuel pumps. But if I need one I will get one.
Is anyone an autotap expert? How do you get rid of all the time stamps?
Is anyone an autotap expert? How do you get rid of all the time stamps?
Phil
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
Are you running the stock Cats? I am wondering if maybe they are clogged up enough to restrict the exhaust flow?
If your timing, AF/R are correct, but your boost is low or lazy, then I would guess either you have a leak on the intake charge, a leak or blockage on the exhaust side, or leaking waste gate.
Have you noticed what rpm it takes to make full boost? Compare it with the other STS guys with equal set-ups and see if they are the same.
If your timing, AF/R are correct, but your boost is low or lazy, then I would guess either you have a leak on the intake charge, a leak or blockage on the exhaust side, or leaking waste gate.
Have you noticed what rpm it takes to make full boost? Compare it with the other STS guys with equal set-ups and see if they are the same.
Thread Starter
Racer
Joined: Feb 2006
Posts: 367
Likes: 0
From: Harrisburg PA
Yep thats what he said about the injectors.
Would you have an opinion on my log files? c1-1 is cruise..d1-1 thru h1-1 are WOT. Im going to get more tonight...as well as plug up the exhaust to check for leaks...especially around the wastegate. If there is nothing there im going to start looking for intake leaks...that wont be easy.
http://briefcase.yahoo.com/bc/man77k...il+Attachments
I dont have cats at all.
Would you have an opinion on my log files? c1-1 is cruise..d1-1 thru h1-1 are WOT. Im going to get more tonight...as well as plug up the exhaust to check for leaks...especially around the wastegate. If there is nothing there im going to start looking for intake leaks...that wont be easy.
http://briefcase.yahoo.com/bc/man77k...il+Attachments
I dont have cats at all.
Drifting
Joined: Jan 2002
Posts: 1,731
Likes: 1
From: Bay Area CA
You guys should try turning up the boost to see what it does, maybe that's all the turbos have at 6psi. I can't imagine that those turbos are anywhere near their efficiency at that low of a boost level.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
Le Mans Master
Joined: Jan 1999
Posts: 5,135
Likes: 24
From: Long Island NY
Originally Posted by Red C5
You guys should try turning up the boost to see what it does, maybe that's all the turbos have at 6psi. I can't imagine that those turbos are anywhere near their efficiency at that low of a boost level.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
The GT32's spool as quickly as STS standard turbos with the smaller A/R.
Safety Car
Joined: Jun 2004
Posts: 4,921
Likes: 1
From: Minburn Ia
Originally Posted by Red C5
You guys should try turning up the boost to see what it does, maybe that's all the turbos have at 6psi. I can't imagine that those turbos are anywhere near their efficiency at that low of a boost level.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
Put in an EBC ( your gonna eventually want/need it anyways), and dial in higher boost to troubleshoot your power loss issue.
NCM, WSCC &amp;amp; SCC Member
Joined: Oct 2002
Posts: 2,900
Likes: 1
Originally Posted by Red C5
You guys should try turning up the boost to see what it does, maybe that's all the turbos have at 6psi. I can't imagine that those turbos are anywhere near their efficiency at that low of a boost level.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
I don't think there is much you can do about the lag, unless you're willing to go to a smaller A/R or smaller turbos. Good luck with getting it dialed in.
That owner is very surprised as well.
As far as efficiency, 7 psi. seems to be the wake up point on a 346 from the data I have seen. Actually, spool is adjusted to the increase in psi.., which in turn provides more cubic air volume per minute. In other words, I believe that you correct about the efficiency.
I am positive his problem is something else and something really simple like the fuel filter. Knock out everything else, one step at a time, its what is left over. EG. The pinhole leak in my FMIC, was costing a 6 psi.. loss by itself alone.
Drifting
Joined: Jan 2002
Posts: 1,731
Likes: 1
From: Bay Area CA
One of the main reasons I say to turn up the boost is it will allow you to see if the problem continues or not. If by going to 8psi you still make the same power you're at now, you know you really have a problem somewhere. Although it's a good idea to change the fuel filter, I don't think it's the fuel filter causing this situation since he's not running out of fuel and the dyno sheets are pretty much unchanged with the two different AF readings.
Maybe the BOV is leaking a little, some are adjustable so maybe check that out.
Maybe the BOV is leaking a little, some are adjustable so maybe check that out.
Drifting
Joined: Jan 2002
Posts: 1,731
Likes: 1
From: Bay Area CA
Originally Posted by Hammer
Under Taker is running 6.5 lbs of boost and has 553 rwhp (on a Z06), so that isn't the problem.
The GT32's spool as quickly as STS standard turbos with the smaller A/R.
The GT32's spool as quickly as STS standard turbos with the smaller A/R.
Only reason I bring up the lag is because the owner said;
Originally Posted by C5A4TT
Took the car for a good ride tonight. Feels like there is way too much lag...more than I expected. Just falls flat at 5k rpms and above. Perfect driveability and no popping, pinging etc.
How could I identify GT32 turbos? I already got the wrong wastegate spring, missing installation hardware, wrong silicone hoses.
How could I identify GT32 turbos? I already got the wrong wastegate spring, missing installation hardware, wrong silicone hoses.
Thread Starter
Racer
Joined: Feb 2006
Posts: 367
Likes: 0
From: Harrisburg PA
Ok got the fuel filter from the local chevy dealer and ordered a .6bar spring for $30 off the net...from NY it should be here by Friday hopefully. Local track has a 4 hours test and tune Sat...maybe I will head out and see what it does.
Raining here so I dont think I can get much accomplished...especially some full power rudolph runs. Need to put a rag in the exhaust to see if the wastgate is leaking. Other than those i will start looking at intake next. I notice my car has very little whistle...unlike some other vids Ive seen here. maybe its the no cats. I dont have a BOV..auto and low altitude.
I really appreciate all your comments guys...thanks.
Raining here so I dont think I can get much accomplished...especially some full power rudolph runs. Need to put a rag in the exhaust to see if the wastgate is leaking. Other than those i will start looking at intake next. I notice my car has very little whistle...unlike some other vids Ive seen here. maybe its the no cats. I dont have a BOV..auto and low altitude.
I really appreciate all your comments guys...thanks.
Last edited by C5A4TT; Jun 7, 2006 at 05:37 PM.
Drifting
Joined: Jan 2002
Posts: 1,731
Likes: 1
From: Bay Area CA
With an increase of approximately 3 psi, you may want to start on the dyno instead of the track and make sure you're ok on AF, KR, etc. Unless of course you have a way to monitor all those things. Best of luck to you.
