How much boost? 2.5L turbo?

[Alex12123]

I have a stage I, 2.5L turbo i want to crank up the boost its at 7psi right now. The block and head have never been rebuild how much can it take and how do you up the psi?? I also plan to put a Blow off valve on it what is the best set up for that?

[xtrempickup]

intercool it, add a bov and add +20s and bump it up to 15psi

[Turbo-Baron]

First of all welcome to tubododge!. If you have any questions feel free to PM any of the staff our PM boxes are always open.With an intercooler and BOV you are safe at around 12-14 psi.You will hit boost cutout at 14.7 i belive. Any pics of your car?

[EvilcowRoland]

Your 2.5 T1 should have a BOV from the factory. It's in the airbox. But it isn't terribly strong so it could rupture with high boost. Get a first gen DSM valve or an aftermarket one. Most folks make a mounting tube and put it in line from the intercooler to the throttle body. Lots of info and pictures of some good setups on this forum if you look around.

If you want to up the boost, you'll need a manual boost controller. The vendors sell different ones. You can also find one on eBay or make your own. Look around a little. There's TONS of information on them also. With that little Mitsu turbo (stock for the 2.5), you'll want to put an intercooler on your car for anything upwards of 12 PSI. You could run 10 or so now and be perfectly fine.

On a final note, if you aren't sure of what has been done to the car and what condition the internals are in, take some time to go through everything before you modify it. The usual points are a must: plugs, wires, timing, fluids, etc. Maybe check the turbo shaft for play too. It wouldn't be a bad idea to get an air fuel gauge since you'll be upping the boost past what the computer was set for. It has some room to play, just need to watch everything and make sure you don't get too far out of the computer's ability to compensate.

[Alex12123]

i will get you some pictures in a little while, i just did a interior swap (from red to grey) and i am putting on the fog lights with the little body kit and then im going to get it painted black after that. So i will you get some before and after pictures of it once im done

[87dtna]

Quote:

Originally Posted by xtrempickup intercool it, add a bov and add +20s and bump it up to 15psi

You don't need +20's to run 15 PSI. But I agree and IC and BOV, and get a manual boost controller to turn boost to ~14 PSI. 15 PSI will hit cutout.

[Turbo-Baron]

Alot of the time if you set it to 14psi it wil spike to boost cutout(14.7 psi) so just be carefull

[87dtna]

Yes thats true, all depends on the vacuum/boost supply line, the wastegate can preload, and the manual boost controller.