STS Turbo setup - question on Cats
11-10-2009, 11:22 AM
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STS Turbo setup - question on Cats I am sure someone is gonna yell at me to do a search but I believe my situation is a bit unique - here is why:
I have Pacesetter 1 3/4" long tubes and a 3" catless y pipe right now.. All heat wrapped and sprayed to the turbo. The turbo is a T67....
Now - I want to upgrade the turbo to a T76 and at the same time bring up the spool time a bit.. In this situation i'd like to avoid taking the headers off and y pipe off... Would a metal-core high flow cat bring the temps up enough to see it spool sooner? I was thinking of doing a hot side in the .80 range ... Thoughts? (other than telling me to go back to stock manifolds lol)
EDIT: this is because I may be doing a forged bottom end in the spring, trying to get an idea
I have Pacesetter 1 3/4" long tubes and a 3" catless y pipe right now.. All heat wrapped and sprayed to the turbo. The turbo is a T67....
Now - I want to upgrade the turbo to a T76 and at the same time bring up the spool time a bit.. In this situation i'd like to avoid taking the headers off and y pipe off... Would a metal-core high flow cat bring the temps up enough to see it spool sooner? I was thinking of doing a hot side in the .80 range ... Thoughts? (other than telling me to go back to stock manifolds lol)
EDIT: this is because I may be doing a forged bottom end in the spring, trying to get an idea
11-10-2009, 11:27 AM
#2
you don't want high flow, you want stock exhaust manifolds w/heat wrap which has a higher/faster velocity of exhaust flow to spool the the turbine faster and the cast iron holds the heat much better. kinda like a garden hose with our thumb on the end vs. 3'inch PVC piping and your hand over the end. you will see a significant difference in spool time and little to no lag with manifolds
11-10-2009, 11:39 AM
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.... did u miss what i posted? lol
well with what u said - ill ask this: what r u doing for a y pipe? and did you port the manifolds? I have a beefy cam 232/240 .595/.608 115.. don't want it to have no where to go lol - but if the exhaust flows faster i guess there wouldnt b a problem
well with what u said - ill ask this: what r u doing for a y pipe? and did you port the manifolds? I have a beefy cam 232/240 .595/.608 115.. don't want it to have no where to go lol - but if the exhaust flows faster i guess there wouldnt b a problem
11-10-2009, 11:54 AM
#4
stock y-pipe, ported/polished stock manifolds. i missed that you are in CT. yes, high flow cats i would recommend. i've heard stories of stock cats breaking down and throwing chunks of the cat into the turbine fins damaging the turbo. i don't know much about cam specs
this is close to what i have but for an LT1: http://leperformance.com/leplsxturbo...rcamshaft.aspx
this is close to what i have but for an LT1: http://leperformance.com/leplsxturbo...rcamshaft.aspx
Last edited by hawk584; 11-10-2009 at 12:00 PM.
11-10-2009, 12:03 PM
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yea i think ill try that - i just wish i kept my mac 2.5" y-pipe that was catless which bolted up to stock manifolds lol
now with that said - if i swap to that, what size hotside on the t76 turbo? ill be using meth on a stock bottom end until it blows up or till i have more money lol
now with that said - if i swap to that, what size hotside on the t76 turbo? ill be using meth on a stock bottom end until it blows up or till i have more money lol
11-10-2009, 12:09 PM
#6
there's a guy here in utah with a bone stock LS T/A t67 sts kit & headers. he said he got the kit for cheap and was thinking about selling it because it didn't make much power (link in my signature). he got a ride in my hawk and it made him think twice
11-10-2009, 12:13 PM
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i no doubt love the system - just takes time and a lot of work.. just want some additional info so its done right this last time around lol
was trying to avoid another PITA swapped exhaust parts, but after a while u kinda realize u gotta..
was trying to avoid another PITA swapped exhaust parts, but after a while u kinda realize u gotta..
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11-10-2009, 12:22 PM
#8
done right is the right mindset ! this is the kit i'm running with my little LEP forged 385cu.in LT1. this is my first turbo one time tuned at just over 500. now that i am conferable i'm shooting for the 600 mark this summer. my friend in vegas is running pretty much the same with his 2002 SS. when he had the t67 LEP got it up to 530 rearwheel on 100oct. with a nearly bone stock LS# and now with a forged motor he's pumping out over 630 safely and neither i or him have had any major issues. most i've had is hose clamps coming loose
http://leperformance.com/lepstsrearmountturbo.aspx
http://leperformance.com/lepstsrearmountturbo.aspx
11-10-2009, 12:30 PM
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i guess my concern is also the idea of losing power - i dont want that to happen..
Anyone else know if i would as well?? or if id keep the power now but have it come on sooner??
Anyone else know if i would as well?? or if id keep the power now but have it come on sooner??
11-10-2009, 05:54 PM
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I see your good numbers. What size are your y and I pipe? I agree with the smaller pipe for less surface area idea. That being said, most people run 2.5 pipe from manifold to turbo. What do you think about 2.25 y pipe then 2.5 for the I to the turbo? The manifolds I've measured have a 2" exit. Doesn't make much since to go straight to 2.5 straight off the manifold, just trying to get others theories on this.
11-10-2009, 08:02 PM
#15
I see your good numbers. What size are your y and I pipe? I agree with the smaller pipe for less surface area idea. That being said, most people run 2.5 pipe from manifold to turbo. What do you think about 2.25 y pipe then 2.5 for the I to the turbo? The manifolds I've measured have a 2" exit. Doesn't make much since to go straight to 2.5 straight off the manifold, just trying to get others theories on this.
11-10-2009, 08:05 PM
#16
I see your good numbers. What size are your y and I pipe? I agree with the smaller pipe for less surface area idea. That being said, most people run 2.5 pipe from manifold to turbo. What do you think about 2.25 y pipe then 2.5 for the I to the turbo? The manifolds I've measured have a 2" exit. Doesn't make much since to go straight to 2.5 straight off the manifold, just trying to get others theories on this.
11-11-2009, 11:32 AM
#19
4xx for the haters lol gts 76 .81 hot side, the highest hp was 813 at 17 psi 14 psi was 760. Best quater since I only ran it twice was a 10.38 142 on a street tire 1.78 short time if i remeber correctly not sure 16 psi. The run befor that was a 11.23 at 136 with a 1.9 short time. The track prep was awsome alot of cam only vettes where low 11 to mid 10s on dr all day. Nothing special epp blower cam patriot stg 3 heads arp studs stock 10 bolt with hardern axels and 3.73 gear meth injection vic jr dual intank fuel system custom cold side custom true Y pipe, and header wrap.
Last edited by OUTLAWZ RACING; 11-11-2009 at 11:33 AM. Reason: sixty foot