Ok,.... I will probably get flamed for this, (been happening a lot lately) but I NEED to know.

Lsvtec turbo t3
Aight..... Car hasnt been tuned yet but the butt dyno feels like 250ish. Running on 10-11 lbs. My buddy has same setup with SLIGHTLY larger turbo and he makes 318 whp @ 8lbs. WTF??? OK he has an = length manifold and 3" piping. Other than that he has type r cams.
Can those differences make this big of a power difference? And also (the reason for the thread),.....he seems to think that we can just turn up the boost until I get to 300whp (my goal) while were @ the dyno. He says that hp is what blows the motor,...not boost. Im not sure either way, still new to turbos but I dont want to crack a cylinder or anything. Ive always heard that you dont want to go over 12psi with stock sleeves. Did I mention that I have stock sleeves?

What u guys think. Is it safe to attempt (while tuning on dyno)?

 

1).His extra power is coming from the cams and the larger turbo.

2) He is right, HP output determines the "limits" not a specific "PSI".

3) Make sure Tuning is on point and 300whp should be a breeze.

4) No flaming from me

Phil

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allanonjj &raquo;</TD></TR><TR><TD CLASS="quote"> 318 whp @ 8lbs. WTF??? </TD></TR></TABLE>

wtf is right.. that is pretty good with just 8lbs of boost..

what is your fuel management.. depending on that and how well it is tuned .. there really isn't a preset limit when it comes to the blowin point of an engine.. it isn't like "oh hey don't go over 11.6927856534 lbs of boost or else".. it is all about how you tune it..
i have seen cars with stock internals get 300 hp..

depends on your fuel management

and engines can blow cause boost.. or leaning out.. ie bad fuel management

 

hey at least your asking and not telling us, so hopefully you won't get flamed and yes your buddy is right. A larger turbo will FLOW more air per PSI then a smaller turbo so you will develop more more on lower boost then a smaller turbo at the same boost level, but you obviously lose spool time with the smaller turbo. He is also right that boost level is largely irrelavent. Why would you think that 5 PSI or 15 PSI effects the engine.....the engine sees thousands of PSI of pressure when the controlled explosion happens, what is a couple more PSI of air....nothin . As long as you give enough fuel for it to not burn lean everything will be fine. The horsepower and torque IS what you want to concentrate on because that means the internals will stress more because of greater cylinder pressures leading to cracked ringlands most of the time. I wouldn't do 300whp because that really is a limit on LS engines and unless you want to push it and may only last a year don't do it. Go for 260-280 and call it a day

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pv2dickman &raquo;</TD></TR><TR><TD CLASS="quote">

and engines can blow cause boost</TD></TR></TABLE>

NO...please STFU

Love,

Adrien

edit: you know I don't understand why people have this thought that boost is the limiting factor on engine durability. True boost is usually linked to power output, but as we all know it's the ignition timing that makes the power and it's always better to run more boost and less timing to reduce heat and peak cylinder pressure


Modified by adseguy at 10:52 AM 6/6/2005

 

ok,....shouldve told you that Ive got eagle rods and cp pistons, as well as a gsr waterpump and oil pump. [edit: pistons 9.8:1]
Being tuned by "Dom-data" (buddy's name is Dominic) chipped p-28 and wideband right now but like I said, we are goin to tha dyno soon. I just dont wanna blow up my junk on the friggin dyno!!!

So ure sayin that we CAN turn the boost up till 300 whp??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allanonjj &raquo;</TD></TR><TR><TD CLASS="quote">
So ure sayin that we CAN turn the boost up till 300 whp??</TD></TR></TABLE>

HELL YEAH! since you have forged internals go for 400whp+ on it! Sleeves crack because of bad tuning I would do around 450whp then sleeve it although MASE regularly (it seems like ) does 500whp+ cars on stock sleeves. So it's possible, but MASE is an awesome tuner from what i see and hear

 

EVEN W/O A SLEEVED BLOCK???

 

....amazing..... lol yep 400whp is no worries on stock sleeves. 450 IMO is the limit and 500 is pushing it, but like I said MASE has done it several times

 

Alright I am his buddy with the other car . I feel the difference is manifold and turbo combined . His car has a T304B and mine is an E . The cams are usually good for about 15-20 whp over first gen B16 but thats not the main issue . His car actually has more aggressive tune than mine but still conservative because it hasnt been on the dyno yet and wideband shows it to have 11.4 a/f . I always run conservative timing maps but if you take to much timing out you will burn the exhaust valves quick make fuel tuning a bitch . I feel 350 whp is safe with stock sleeves even though some have made more but for how long ?
As for my car making 318 @ 8 lbs , it did this with 2.5 " DP and 58mm TB . I am putting a 70mm TB with better IM and pushing this little turbo to its limit at 18 psi or about 450 whp , I made 404 whp at 14 psi with small IM and TB .

 

well that's great that you don't want to push past 350whp for stock sleeves. I was just mentioning that people usually sleeve when they pass the 400's and (again) like I stated MASE has tuned a few cars a 500whp+ on stock sleeves. It's all in the tune as you probably know . I believe Jeff Evans (another reputable tuner) recommends sleeving in the 400hp range.

PS: how can he have a more aggressive tune if he hasn't been on the dyno yet? (if I read correctly)

 

Well tuned might have been a reach but I tuned his a/f to 11:4 and he has more aggressive than mine compared to my 8 psi maps . I based his off mine for a start since the setup was close so I figured it would be a good starting point and he is running leaner than mine with a tad bit more timing .