I was wondering if anyone knew what the max boost I can run on my tC. I have a turbo-kits.com turbo set up with a 3" downpipe back exhaust system. I currently am running 8lbs of boost. I have not got the car re-tuned yet since I got the new exhaust system.
Previous to the new exhaust the car had 230whp and 235 ft lbs tq with a Magnaflow cat back system. Im getting it tuned this week and was wondering if I should have them crank of up the boost or is the stock engine internals not designed to handle more than 8lbs of boost.
I'm hoping with the new exhaust that it bumps up the horsepower by 30 or more and it allows for more boost. Does anyone know what the max boost I can run with this new exhaust?
Thanks.

 

dont exceed 14 psi on stock internals is the rule of thumb for our motor. I'm running 3" exhaust with a 2.5" downpipe at 14psi and about to go higher once i get my parts in, so you wont max out 3" exhaust anytime soon.

 

There is not such thing as max boost. It's all about the power your making. Not boost. You can be boosting a million pounds and only making 230whp and that won't blow your motor. I say don't pass 320whp. But it all depends on your tune/setup. Other people blew there motor on higher power some on lower power. There is no actual figure. Like I always say do what your pockets can afford.

 

By the way search the forum. You will see other people opinions.

 

https://www.scionlife.com/forums/sho...d.php?t=185745

Here's a good thread to read regarding this subject.

 

So your saying the engine would be able to safely handle 14 psi. I just do not want to take any chances and blow my motor. I invested a lot of money in the car and do not wanna F it up. Im shooting to exceed 300 whp, i was just curious to see how much it can be cranked up to try and achieve some big power gains.

 

Every time you increase the power in your car your increasing the chance that something will break. I wouldn't go over 300, and as a earlier poster indicated the psi doesn't matter.

 

i was at 303 whp and have no problems with my stock motor..
i am currently running at the 325 whp mark and all seems real good

 

Yeah I've heard that the motor can take up to 350, so under that amount might be fine. 300 is just the limit of my comfort level.

 

Yup. Totally agree.
I'm thinking about going back down to 300. It is alot of power over stock.

 

Well since the PSI does not matter, how else would you increase the horsepower without increasing lbs of boost? I always thought the more pounds of boost your pushing the more horsepower.

 

Also the turbo I bought has 550cc injectors and I also got the AEM F/IC plug n play unit, I really have no idea on how to tune the car and make air fuel ratio adjustments, that why I leave it to the pros. I was wondering with these injectors and F/IC is their a way to crank up the horsepower.

 

when you raise psi you do raise the horsepower noob. you can advance timing and get more power, switch to race gas or ethanol and get more power, run nitrous and get more power. i dont know if 550's will be good at 14psi without an upgraded fuel pump. all of the answers you have asked have been covered atleast 100 times each. from now on use le ole search feature. it saves kittens.

 

Ok, lets take a step back. A set psi level on a turbo set up will not yield the same power as the same set psi on another set-up (due to many factors including tuning turbo size etc). So in guaging whether the psi you have your car set to is safe or not, you have to evaulate how much hp the car is making as the engine can only take a certain amount of hp before it blows. So, the # you set your psi to doesnt really matter, also long as you are within the hp limits of the engine.

Now that are some other factors that come I to safety, most importantly the quality of your tune, but that's a big picture explanation. I would suggest you read that thread I posted above.

And yes, you can increase the hp by increasing your boost psi.

 

Well thanks for the advice, I tried searching and could not find anything on the forum, thats why I posted this thread. I keep getting different information from people so I am trying to get the best answer. Someone had mentioned before you could have a bunch of boost and still produce only 230whp. I am new to forced induction and trying to learn as much as possible. Well I am taking my car to get dyno tuned tomorrow, so from the information I have received I am going to have them increase the boost to 10lbs and see what type of power I am going to have.

 

your power gain is probally only gonna be 14-18 whp

say for instance...
with my 57 trim
1psi=10 whp....
you have a smaller turbo..
so safe to say..
1psi=7-9 whp. i think more towards the 7 whp

 

What about since I added the 3" downpipe back exhaust system wouldnt the power be increased even more? I have no cats or muffler on it.

 

i would say.. if you bump up the psi to about...
8 psi...235-245 whp
9 psi...245-255 whp
10 psi...255-265 whp
11 psi...265-275 whp
12 psi...275-285 whp

you'll gain sum from you full exhaust.. but not much....

 

Go 20-22 psi. See what happens. Search

 

Sweet thanks for the information, I am going to get it dyno tuned tomorrow and have them crank the boost to 12 psi. I am hoping to get the car running in the 13s in the qtr mile. Currently the last run I had was 14.6 but I was leaking air. So hopefully with the new exhaust and the increased boost I can acheive my goals. Thanks everyone for your advice. I will post up here after I get it tuned and let you guys the results.