bigboybigtruck21

OK so here is the deal im running the TVS with the 2.75 pulley and for one reason or another when doing pulls in third gear right around 3800rpms I hit a wall... What im saying is at 3800rpms my car is making 20psi and just stays there through the rest of the pull... I have no clue why its doing that but the map is good, the timing is good, the atf is good, my temps are good, belt is tight, no leaks, and the all of things have been check many times... Im just trying to see if anybody else hase any ideas for me to check or maybe you live close enough to me where we could meet up only if you have vast exp with the TVS..

MODS becasuse i know someone is going to ask...

timing 26
atf 11.3
3in intake
stock TB
meth
built bottom end
dual pass and h/e
full exhaust

If you need to know anything else please ask me... Im going back on the dyno in a day or two so any help would be great..

N1ckateen

iTrader: (1)

nooby here, but i wonder if maybe getting the LS4 throttle body would scort more air in allowing it to fully boost in the higher gear? just a complete guess.

bigboybigtruck21

i had the ls4 on to start with and just way to hard to tune kept throwing codes the whole time..

alleycat58

I don't have the LS4 and I hit peak boost just fine with almost the exact same mods, no built bottom end and substitute e85 for meth, throttle body shouldn't be the issue.

bigboybigtruck21

how much boost are you making

WSFrazier

Just 3rd? Not 4th or any other gear?

You really need to log the car when it happens and post it. We can't magically diag a car.

bigboybigtruck21

first and second are detuned so i can make traction... but we are tunning the car in third

N1ckateen

iTrader: (1)

I see, well looks like my guess got thrown out of the bag pretty quickly.

WS post more pics and info of my shitty orange cobalt that you used to own haha

WSFrazier

By de-tuned I assume you mean bleeding off boost. You can only bleed boost off in 1st gear. If you tell it to do 2nd gear, it will do it in all the gears.

Also sounds like you might have fuel cut set to 3800 somehow/accidently.

So far, I have yet to find out where its located since you gave it back to dealer. Can't seem to track where it went at all after that.

bigboybigtruck21

So your saying if i change the settings for second it will effect the rest of the gears??? and i dont think its the second because its more about the boost not so much as just at 3800 sometimes is 4000 sometimes its 3700 its just when it hits 20psi in third

WSFrazier

Yeah, even though HPT has separate fields for each gear, whatever you put in the 2nd gear box will also apply to 3,4,5.

Change 2nd gear back to 100 and try again to make sure.

bigboybigtruck21

ok anything else you can think of

WSFrazier

Nothing really without a log of the car, if your saying the car is actually making 20lbs in 3rd, it probably isn't the only problem. If it was bleeding off boost, it would be making less than 20lbs.

But I figured I would let you know 2nd gear boost control affecting the rest of the gears.

bigboybigtruck21

OK putting it on the dyno tomorrow morning and I will let you know whats up... How much boost should I be making with stock Heads and the 2.75 pulley..

WSFrazier

That is the same pulley I run with the car in my sig.

Never really paid attention to boost, but I think around 21-22.

bigboybigtruck21

what rpm are you at when you hit max boost

SunburstSS

iTrader: (48)

telling the car to make 15 psi in second gear for example will affect the boost in the next gears too from my experience with HPTuners...try taking the limit off

bigboybigtruck21

will do man thats what we are doing tomorrow

bigboybigtruck21

OK so this is were i sit as of today.... Boost gauge is reading 26 or so PSI on third gear pulls... But for some reason there doesnt seem to be any power like the boost is not making it to the motor for some reason..... ATF is good.. timing is good... intake temps are good.. but hpturnes is saying its not making boost into the motor.... So i have no idea what else to check or do... o all the vac lines seem like there good... The only thing I can even think of at all is the supcharger gasket is leaking... or the bypass is messed up.... or hopefully not but the supercharged is messed up some how... Please if you have any input or ideas or things I could check please let me know asap... Thanks for the input guys

383_Stroker

iTrader: (3)

Your stock map sensor maxes at ~22.5psi .. hptuners gets its boost signal from the map

bigboybigtruck21

Yea i got that man but its has the other reading thats tell you how much boost is going into the engine itself..

383_Stroker

iTrader: (3)

What reading are you talking about exactly?

freakta

iTrader: (1)

i had some strange problems with mine as well, i just disconnected the actuator and let the car do its thing. no regulating boost at all in any gear it seemed to fix the probelsm

2K5SS/SC?

Did you use the bypass valve that comes with the TVS or the stock M62 one? If not, you need to use the stock M62 one. I'll call Colin today and talk with him about it.

mrbelvedere

iTrader: (3)

good luck with that they are different