Question about PSI boost acceleration

[kashdog1]

Hey everyone, I'm still learning all I need to know about the typhoon, I have seemed to run into another problem. I know that stock the typhoon should do about 5.3 0-60. I have a new atr intercooler, and that’s all. I recently noticed that I was only getting 10psi at max acceleration. I then timed my 0-60 and it was somewhere in the 7-8 sec range. I don’t like this. So if anyone has any suggestions, they would be much appreciated.
Thanks
-Andrew

 

[Quickstop [UK]]

Re: Question about PSI boost acceleration

Your stock turbo should give you a max of 14.7 psi. You may have a faulty solenoid that is dumping the wastegate before you get up there or you may not be generating enough boost because the turbo is knackered or a whole host of other reasons.Run datamaster.

You could try adjusting the rod on the wastegate actuator arm but I would only try that after you have learned a bit more about the car. I have just got one myself and there is a lot to learn about this car!

Intercooler would not affect the amount of boost you can generate, only how much gets to the engine.

Standing by to be corrected!

 

[kashdog1]

Re: Question about PSI boost acceleration

Would you recommend to take the Typhoon to a chevy dealer, and just let them find and fix the problem?

 

[SY756]

Re: Question about PSI boost acceleration

Would you recommend to take the Typhoon to a chevy dealer, and just let them find and fix the problem?

I wouldn't recommend that. First thing to do would be to check out the truck with Datamaster or some type of logging program. Has the truck always had a boost issue since you got it? If so, then the previous owner could have messed with the wastegate actuator rod. You might see if there are any fellow Sy/Ty'rs close that maybe could help you out. Then there is always here. The best people for sy's and ty's are right here on this forum.

Also, there are quite a few good "how-to's" here.

http://www.sytyarchives.com/howto/

good luck.

 

[VermontTy]

Re: Question about PSI boost acceleration

From what I recall, with the boost solenoid unplugged or not functioning correctly, the truck will only make around 8psi. Another things that I would check are ALL the vacuum lines to make sure there are no leaks or anything disconnected. I would definitely avoid the dealership at ALL costs!!!!

 

[wantingasy]

Re: Question about PSI boost acceleration

From what I recall, with the boost solenoid unplugged or not functioning correctly, the truck will only make around 8psi. Another things that I would check are ALL the vacuum lines to make sure there are no leaks or anything disconnected. I would definitely avoid the dealership at ALL costs!!!!

I've read that this would happen from a couple of people, but mine was unplugged for about a month ( didn't know it was ) and I was overboosting. It would creep up to about 17/18!!! :2cents:

 

[HotRudyRod]

Re: Question about PSI boost acceleration

Yeah like Adam told you try checking for broken or disconected vacuum lines, the hard lines get very brittle with time and are easy to break. Try taking a look at the turbo's vacuum box ( the lil black box by the turbo with vacuum lines attached to it) as its very close to the turbo and any one stickin a hand in there could have broken or discconected a line. Mine had that problem, some moron was snoopin around at a paint shop tryin to see what turbo size it was and then my truck was running crappy after that till i found the problem. Good luck.

 

[kashdog1]

Re: Question about PSI boost acceleration

Thanks for all the help. I'm seeing if I can find anyone in the Chicago Land area that has more knowledge about this truck then I do, to see if they could help me out on this problem. Hopefully I'll be able to get my typhoon to full boost, to really be able to feel the power. Thanks again
-Andrew

 

[SeattleSy#1255]

Re: Question about PSI boost acceleration

do the work yourself...it'll pay in the long run. Just read everything you can here.

First thing to fix is all your vacuum hoses. Replace them. Then see if you get full boost.

Search and ye shall find!

 

[midnightbluS10]

Re: Question about PSI boost acceleration

Get an aftermarket boost gauge if you don't already have one. Then you'll see how much boost you're actually getting.

 

[dgoodhue]

Re: Question about PSI boost acceleration

If its taking 7-8sec to get to 60 you have some issues. I would recommend that you don't go WOT until you give the truck a tune up, replace the vacuum lines, and then have someone (not a dealer) look at it on scan tool.

 

[dgoodhue]

Re: Question about PSI boost acceleration

If its taking 7-8sec to get to 60 you have some issues (even with 10 psi of boost). I would recommend that you don't go WOT until you give the truck a tune up, replace the vacuum lines, and then have someone (not a dealer) look at it on scan tool.

 

[SyTyJedi]

Re: Question about PSI boost acceleration

Ok, few questions:

What boost gauge are you reading? If you stay stock, see list of things to get below.

How are you timing your 0-60?

Why did you need the ATR intercooler? Problems with stock one? Did you upgrade the pump or add a heat exchanger as well? (trying to figure out if you have just the IC or the whole kit)


List of things to get ASAP:

- An aftermarket gauge. (Autometer is cheap and Jedi approved) The stock gauge isn't linked to anything real, it just throws out a random number. GM did this just to mess with your head.

- Datamaster. It is impossible to troubleshoot without a log of what is happening. You wouldn't wipe your ass without checking the paper to see if you're done, so don't do the same with your truck.

- Wire your intercooler pump to run all the time (search for this)

- Get an adjustable fuel pressure regulator (search for this)

- Do a complete tune up and verify that your timing is set correctly (search for this)

- Check and replace (if necessary) your vaccuum lines (search for pics of what to /checkreplace)


List of things to NEVER do:

- Take your truck to the dealership

- Not ask a question because you think the issue is too small.

 

[dirtdemon]

Re: Question about PSI boost acceleration

List of things to get ASAP:

- An aftermarket gauge. (Autometer is cheap and Jedi approved) The stock gauge isn't linked to anything real, it just throws out a random number. GM did this just to mess with your head.

- Datamaster. It is impossible to troubleshoot without a log of what is happening. You wouldn't wipe your ass without checking the paper to see if you're done, so don't do the same with your truck.

- Wire your intercooler pump to run all the time (search for this)

- Get an adjustable fuel pressure regulator (search for this)

- Do a complete tune up and verify that your timing is set correctly (search for this)

- Check and replace (if necessary) your vaccuum lines (search for pics of what to /checkreplace)


List of things to NEVER do:

- Take your truck to the dealership

- Not ask a question because you think the issue is too small.

had the same probs as you kashdog1- when taking the beast out in the first few times after gettin it run somehow (grabbed my truck cheap, but almost dead) -

i can highly recommend to do all things mentioned by sytyjedi in his list !!!

- that really did it for me ... :2cents: :tup:

now my ty does 0-60 in a low 5s - but runs very rich @ 47psi fuelpressure (w/ stock chip - still waiting for the ultimate :rant: )

try this : http://www.sportmachines.com/maintenance/recipe1.php - and dont forget the 13. !!!

hope it helps,
pat.

 

[bezerk]

Re: Question about PSI boost acceleration

i need to vent this over here.
but if your truck is knocking like a mofo (but you don't hear it). stock chips will cut back boost.
as mentioned before, it can be the vacuum lines. you have to replace them anyway. but you need..and you REALLY need a scantool to know you're safe. cause there can be alot of causes to be slow

 

[dirtdemon]

Re: Question about PSI boost acceleration

i need to vent this over here.
but if your truck is knocking like a mofo (but you don't hear it). stock chips will cut back boost.
as mentioned before, it can be the vacuum lines. you have to replace them anyway. but you need..and you REALLY need a scantool to know you're safe. cause there can be alot of causes to be slow

bezerk, but what for example could cause massive knock on a stock motor w/ stock turbo, except a fawked up fuelpump or a faulty ignition or spark, or even the vac-lines ??? :roll:

TIA,pat.

btw.: excuse another noob-lesson

 

[bezerk]

Re: Question about PSI boost acceleration

bezerk, but what for example could cause massive knock on a stock motor w/ stock turbo, except a ****ed up fuelpump or a faulty ignition or spark ??? :roll:

TIA,pat.

btw.: excuse another noob-lesson

t

hight iat's, wrong timing bad FPR, bad map-sensor o2 sensor, bad alternator
etc. etc. etc. etc

 

[dirtdemon]

Re: Question about PSI boost acceleration

aye, but the things u listed should throw a code if working not proper - or am i wrong :roll:

im that bizzy cause im still waiting for my DM-cable ::steamer:
... like you mentioned before, all the things (in my case) are new and tuned fine IMO (cat reinstall *lol*) - time for me to worry ???

what da hell's a hight iat's :dunno:

 

[Don W.]

Re: Question about PSI boost acceleration

Despite the few barbs back and forth this is an interesting thread with some good info for the new owner. Diagnose, diagnose, diagnose, check and double check seem to be the answers here.

Kashdog1 - keep at us, this place is full of good folks with great answers. To paraphrase a post the only dumb question is the one you don't ask.

 

[bezerk]

Re: Question about PSI boost acceleration

aye, but the things u listed should throw a code if working not proper - or am i wrong :roll:

im that bizzy cause im still waiting for my DM-cable ::steamer:
... like you mentioned before, all the things (in my case) are new and tuned fine IMO (cat reinstall *lol*) - time for me to worry ???

what da hell's a hight iat's :dunno:

they do not always throw a code, but you can see most of the stuff in DM when some things just aren't what they should