Sts Owners Help
Thread Starter
Teching In
Joined: Jun 2005
Posts: 16
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Sts Owners Help 
I just finished getting my sts turbo put on and its making really low numbers on the dyno. My car is a 2001 TA ws6 with m6. The following mods are sts turbo with a t76, methanol injection, racetronix fuel pump, 42lb svo injectors, kb boost a pump, gutted cats. Its only making 440 rwhp at 9psi tuned at the dyno. The turbo isnt fully spooled until 5500rpms. I realize the turbo is kind of too big but the dyno results were disappointing. Im switching to a t67. 
Why is it so damn weak dont get hung up on dyno #s, my sts setup only showed 360 rwhp on dyno, then i went to the track and cut my time down by 2tenths, i raced my buddy 420 rwhp car and stayed nose to nose, see what your car does on the street and track before you junk the setup, i agree the 76 is big and will spool later, i know your frustration i felt the same way. but dont get hung up on dyno #s it is just a tuning tool your real data comes from the track or street. also wrap your exaust from headers back to turbo that may help your spool up. just keep digging it took me almost a month to work out the kinks and get the system running good. just dont give up. 
Full spool by 5500 rpm?! In what, 1st gear?! Something isn't right man... You definitely aren't loading the turbo correctly or something else is wrong. I can only imagine my car on a dyno with the T70 in 4th gear, that thing would spool up quick. What was your fuel pressure like?
i had this SAME kinda issue with my TTi twin kit for the vette. turns out i was leaking boost out my worthless shitty BOV's that were included. i barely hit 15 lbs of boost at the TOP of 4th. once i fixed the bov's i was able to hit in excess of 21 lbs of boost well before 5k in 4th.
SO if you have some kind of BOV, the spring could be weak, or you could have a poor boost refrence, OR just a random leak somewhere. Its very hard to hear it over your engine screaming and it sucking in massive amounts of air. the leak just sounds like part of the overall way it should sound. very hard to hear if you arent a seasoned turbo pro. even when i had it on the dyno at a speed shop, no one knew that was the prob.
gl with the trouble shooting!
SO if you have some kind of BOV, the spring could be weak, or you could have a poor boost refrence, OR just a random leak somewhere. Its very hard to hear it over your engine screaming and it sucking in massive amounts of air. the leak just sounds like part of the overall way it should sound. very hard to hear if you arent a seasoned turbo pro. even when i had it on the dyno at a speed shop, no one knew that was the prob.
gl with the trouble shooting!
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Thread Starter
Teching In
Joined: Jun 2005
Posts: 16
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No the car was tuned and it made 440 rwhp. The housing is a .81 ar. It will chirp the 275 tires at 55 barly. That is in first it takes to 5500 rpm to fully spool. I don't know how much this will affect it but the shop forgot to put on the bov.
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WOW... your AF is WAY High.. you need to get it down to 11.0 -11.5
You went with a 76 on a stock block with 42# injectors? Somebody steered you wrong brother. With a 67 I max out my 42's.... And unless you have done allot to limit the heat loss a 76 is way too much for a Stock LS1
You went with a 76 on a stock block with 42# injectors? Somebody steered you wrong brother. With a 67 I max out my 42's.... And unless you have done allot to limit the heat loss a 76 is way too much for a Stock LS1
Originally Posted by 2k1ws6
My air fuel is about 14.5
How do you still have a motor after running that lean.. You're AFR should be around 11:1.. No wonder you arent making any power. Chanches are you probably popped a few ringlands on #7 and #8 as well..I would rethink your tuning startegies..
Is there a block off plate for the BOV? If not can you say boost leak? That might explain your lean A/F. With the mods you got i would say do 67. I dont think I would use that shop that your at any more though. Hopefully it turns out alright 
Originally Posted by 2k1ws6
If the rings pop do I have to tear the motor apart and how can you tell. The afr is about 14.5 at idle and goes down to about 12.5 when they dynoed it.
Originally Posted by 2k1ws6
If the rings pop do I have to tear the motor apart and how can you tell. The afr is about 14.5 at idle and goes down to about 12.5 when they dynoed it.
12.5:1 is still too lean.. 11.5 should be the leanest you want to go..