Well just got the car tuned today, and made 500whp and 520ft tq but at 16 psi thats alot of boost pressure for that little of power, also we noticed that when we raised pressure it would only go up a little after
12 psi..... there were no leaks at all that we are aware of. Taking the car back next wen to do further testing. I think that the engine is choking ofair but i dont know how it would be possible. I have a 8.8 compression motor, full built short block stock long stock heads and cams. But still that shouldn't be the issue for only the 500hp club. Also have a crawford plenum.

Didn't print of a dyno graph, but was linear till 5800 where the power dropped off. took it to 7100 but was no use at all. She is running pretty good, fast as ****. Also tunining with the UTEC, and we tuned of wastegate pressure cause the boost solonoid wouldn't work.... That was another problem. Also In order to start the car you have to give a little gas, and the utec couldnt do anything about it even though it has standalone fuel injection control.

Any suggestions would be greatly appericated!

Thanks
Dil Dhillon

 

you running the stock turbo that comes with the kit, the 60-1 or did you ever upgrade to the 62 or 67? i bet if youre using the stock turbo, its running out of its efficiency range and its blowing hot air which is causing the minimal rise in boost.

if youre running a larger turbo, i cant help, lol.

congrats on the build tho, missed you at zdayz.

 

Oo sorry forgot to mention this is a t66 turbo, that was the other thing we were looking at. Wenesday we are taking out the turbo and measuing it. I MISSED IT BRO... was sooo pissed. The car wasn't ready you know how chit is...

 

What exhuast system are you running? If boost pressure is stable, but power is dropping off after 5800rpm, I would be looking at an exhuast back pressure issue. As a test, you could unbolt your exhuast, and see how much more power you make?

So you have the upgrade T66? Nice....

 

Yes sirr! The greddy evo 2 I just posted it for sale, what do you think i should go with.

 

oh well then, im not sure, i agree with sharif, maybe high exhaust back pressure. maybe a charge system leak, have you checked all the exhaust connections before the turbo, could be leaking when the rpms and exhaust gas flow increases.

 

Also with the greddy evo 2 i have a 2.5 inch down pipe and cant fit a bigger one because the ac is right in the way according to my tec. but basically the crawfords to the down pipe through the greddy evo 2

 

Sounds like your exhaust and stock heads are holding you back bro.

 

Based on what you just described, its almost definatly an exhuast back pressure issue. Open that thing up with a 3 inch or larger downpipe, and the largest single exhuast you can tuck underneath the car.

But seriously...try unbolting you exhuast, and see what type of gains you make. This will confirm the back pressure issue.

 

What up Dil? You going to Woodward tonight?

I was present for a few hours while Dil was getting his car tuned. My initial thoughts were that it needs cams because it's almost like it hits a wall around 5600-5800 rpm and would stop making power right around 5800 rpm I believe. However, the exhaust could also be choking the car. He has a somewhat modified Greddy EvoII from what I remember.

Dil, Chime in here, but I think the exhaust is run into one pipe for several feet then spits into duals toward the back? That one section may be restricting airflow. Run a true dual 3 inch the whole way back.

 

I previously had the EVO II and when Sharif tuned my car it would stop making power at 4500 rpms or so. Also the more he turned up the boost the less power I would make. If I remember correctly I made something like 410whp @16psi with the exhaust on and when he disconnected the exhaust at the test pipes I made 543whp @12.5 psi.

 

the stock downpipe on the TN setup is 3" if i remember correctly...did you have to reduce the size or something?

 

with the TN kit, you cant really change the DP can you, isnt it squeezed in beside the motor. if so, there might not be much you can do about the exhaust that will help.

 

Whats up guys, i passes out early last night... long day. I think that is what i am going to do. Just take of the exhaust and run maybe a custom 4 in or a 3in what 3 in do you guys perfer?

 

Bro, you missed some good **** last night! Bout 60 cars and some were down right sickning Mike's Z06 was pulling hard and they were looking for you. There was also a single turbo saleen and twin turbo saleen that were bad *** (Mike beat both of them) and a few really fast ls1 trans-ams (1 even pulled its wheels off the ground at launch).

3 inch exhaust? I'd say go with the AAM or APS. I have the SVRT, which as you heard sounds pretty bad ***. However, the downside was that it took like $400 to fix the alignment issues and weld flex sections into the exhaust to make it fit on the car.

 

i know somebody who has an aps exhaust for sale pretty cheap, probably the best flowing exhaust out there for the single. BUT its aps, and i know how you feel about aps.

 

Hahah its fine with me as long as its a three inch with very less restriction

Shawn.. DAMN I MISSED IT, next week i gotta get the car running right then i will race the z06... 500whp aint gonna do it haha. Dont worry we are gonna get them!

 

here's the thing that might work, in terms of using a larger diameter downpipe......of course clearance won't allow much more than 3" round.....

if a shop were to take the time to take 4", heat it, and hammer it into an oval shape, at least in the necessary clearance areas, to fit between the block and the frame....that would be a much larger pipe

 

the aps exhaust is dual 2.5 inch, so 5inch total.

 

same with my greddy it is a 2.5 dual, i wanna switch to a single now just 3in straight no resonator