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Old 07-10-2008, 03:04 PM   #1
JTPerryR1
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Default Way to much Lag

So I went to get the car tuned Monday at xxtuning. 05 STi stock long block with a rotated gt35r .82. We stopped at 411 whp on 93 oct. because the lag is so bad. I don't see full spool until like 5300 or maybe even higher, which sucks . It has a stock header on it. Anyone have any thoughts on this? I realy don't want to buy another turbo right now, but something has to be done
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Old 07-10-2008, 03:07 PM   #2
fobiawrx
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you got a leak. go over your exhaust and make sure its all tight and sealed.
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Old 07-10-2008, 03:15 PM   #3
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Quote:
Originally Posted by fobiawrx View Post
you got a leak. go over your exhaust and make sure its all tight and sealed.
+1 So you have stock headers, I would think its one of the 2 gaskets from either Header to Up-Pipe or Up-Pipe to turbo.
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Old 07-10-2008, 03:47 PM   #4
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All brand new. No leaks. Its the first thing we checked
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Old 07-10-2008, 04:00 PM   #5
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^ Stock motor is your answer. I got cams and 8500rpms of room and lag isnt in my vocab!!!!
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Old 07-10-2008, 04:04 PM   #6
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What are you using for boost control?... Also did you guys try and lean it out in the lower rpm's to try and raise exhaust temp to try and spool it quicker..... Also is this only in the lower gears?....It does sound like a exhaust leak however.
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Old 07-10-2008, 04:05 PM   #7
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what exhaust is on the car? have you pressure tested the whole system? intake too?
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Old 07-10-2008, 04:09 PM   #8
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I'm comparing to other similar setups. We overlayed my dyno chart with others and mine looks horrible. Most gt35rs have full spool at 4700-4800 and I'd be happy with that.Hardly any boost in 1st gear. I have a haliman manual boost control. we got up to 22 psi. Chris did try to lean it out some and give it some timing, but didn't go crazy.
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Old 07-10-2008, 04:11 PM   #9
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Please list all modifications:
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Old 07-10-2008, 04:13 PM   #10
JTPerryR1
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3" all the way back. when its on boost it holds it to the rev limiter, so I don't think there are any boost leaks.
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Old 07-10-2008, 04:17 PM   #11
JTPerryR1
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05 sti stock longblock,cams and header. gt35r .82,txs front mount,ultimate racing 1000s and rails,aeromotive fpr, tgv deletes,all 2.5" intercooler piping, tial bov,perrin big maf, slowboy up and down pipe, tial 44, halliman mbc. tuned w/ cobb ap v1
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Old 07-10-2008, 04:22 PM   #12
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Quote:
Originally Posted by JTPerryR1 View Post
Chris did try to lean it out some and give it some timing, but didn't go crazy.
Timing should be retarded to increase spool along AVCS timing advanced.
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Old 07-10-2008, 04:27 PM   #13
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He did retard the timing, maybe I worded that wrong. He didn't want to go to far, because It was getting worse off boost. He did spend about 4 hours on it.
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Old 07-10-2008, 04:30 PM   #14
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Check compression, do a leakdown, check to makesure the BOV isn't leaking. Go back to a EBC. Check turbo, make sure its spinning freely and isn't eating oil.
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Old 07-10-2008, 04:34 PM   #15
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We put a brand new tial bov on it while I was there, because mine was leaking.I checked the turbo yesterday, spins free and no oil. Haven't checked compression yet, but the car sounds good.
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Old 07-10-2008, 04:36 PM   #16
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Will the boost control have that much effect on spool?
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Old 07-10-2008, 04:39 PM   #17
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Boost control will help you get to your target boost as fast as possible and help bleed boost to keep you at the target. I never cared for MBCs, i know a lot of guys run them with no issues though.

Just because a motor sounds fine doesn't mean you don't have a leaky valve. Also, are you EWG? Might wanna check that too. I have seen those tials go bad. Especially the 38mm ones.
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Old 07-10-2008, 04:39 PM   #18
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Quote:
Originally Posted by JTPerryR1 View Post
Will the boost control have that much effect on spool?
my car seemed to lose quite a bit of 'spool time' (laggier) when I went from a Hallman MBC to the Greddy Profec B.. even adjusting the gain perfectly.
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Old 07-10-2008, 04:47 PM   #19
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At 4700-4800rpm what are your afr's???? You could add fuel with the retarded timing and that might help a little. What intake set-up are you using, is it a 3" inlet on the turbo???
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Old 07-10-2008, 04:59 PM   #20
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If u dont have any mechanical issues with the car then you need to find someone else to tune it.
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Old 07-10-2008, 04:59 PM   #21
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Perrin big maf,turbo is a 4" inlet. I think Chis did what he could with fuel and timing .I'd say like mid 11's at 4700-4800 and about 10.6 at full boost.At the downpipe.
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Old 07-10-2008, 05:10 PM   #22
JTPerryR1
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By the way is anyoneelse running ultimate racing injectors with a stock ecu.Tuner says they are for stand alones only, and I still have some stalling problems with them.
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Old 07-10-2008, 05:15 PM   #23
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That is a ludicrous statement your tuner made. Sounds like you need to find a new tuner.
I know guys that have near perfect idles with UR1kcc injectors.
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Old 07-10-2008, 05:19 PM   #24
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Thanks for that doctor Nick. He said my injectors were the worst thing I did to the car,a huge mistake. Also the funny thing was, after the first pull on low boost, I could have sworn he said I had full boost by 4800,which I expected.Then all of a sudden it was mid 5000s.It just seemed like he was so negative about everything I had.

Last edited by JTPerryR1; 07-10-2008 at 05:27 PM.
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Old 07-10-2008, 05:33 PM   #25
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Did you get your parts from or have them installed by your tuner?
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