Okay,

So some of you have been tracking the problems with my car, if not here is the quick review. Brand new motor with Carillo rods, head studs, etc... Brand new Stage 5 Garrett T04 turbo's, fuel injectors, exhaust, wastegates, EVO V flow air intake, EVO air inlet pipes, EVO boost hoses. GIAC software.

Car has a boost leak that PES is having trouble finding. It apparently gets to 13 psi and that is all, it should be hitting 19 or 20. They have pressure tested the entire system and cannot find a leak. They have changed wastegates, checked the divertor valves, replaced the MAF, replaced a solenid that activates the camshaft (which read bad on the dealer diagnostic). Changed sparkplugs, run the dealer diagnostic equipment again and no codes. Car idles and runs fine but under full throttle hits 13 psi and won't go further.
They are going to remove the exhaust and run it to see if their
is some weird blockage through the exhaust. I doubt this will fix the problem because it is a brand new Fabspeed exhaust.

Anyone have any ideas? I am beginning to think we have a bad turbo even though they are brand new. Or something inside the motor but it was just built by EVO. HELP! This is driving PES and myself crazy!

 

I had that same problem with mine for a while. It ended up being a simple valve that would stay open......I wish I could remember the name of it. Same thing. The motor would pressurize, Turbos were good, same senario.
I remember the valve wouldn't close to build up all the boost. My car would hit .4 bar when it shoulda hit.9. I will try to call my tech again and find out what it was. It did take 3 weeks to find it.

josh. If you want to find out right away call Delta imports, ask for Brady(tech) or Brad, tell them Josh's cars boost problem last year. Or I will find out later today.

 

Thanks that would be great.

 

I would rule the turbos out, but open them up and check the compressor wheels for any damage. This sounds like a wastegate/ boost controle issue. If your car is building boost untill 13psi then stops I would look into the wastegate. To me it sounds like your building boost off the wastegate spring then its is releaved at its max of 13psi. It should be held closed untill a certain boost is reached then released. If possible take a aftermarket Boost controller and hook it up to the wastegate bypassing the stock ECU controll and see what happends. Also are you running internal or external wastegates?

 

The turbo's are brand new and Tony from PES personally checked them over, they were spinning freely and had no signs of problems. The wastegates are
also brand new and he said he could see through the dump valves into the wastegate that they were completly clean and shiny meaning no exhuast gases were passing through the dump valve. These are external wastegates.

 

often when my car goes into limp mode( due to too much boost... it stays at 13 psi. i disconnect the battery for a few minutes and its back up again. but Im sure thats not ur problem caus eI would figure u dont have any throttle control shut down
good luck.
markski

 

Sounds excactly what mine was. the only difference was, mine was a little black valve up by the diverter valves.
My tech is still not answering his phone. I'll try again in the morning.

 

i would check teh wastegates.. seems lieka wastegate problem with me . check the springs , and see if the vlaves are sticking ..

also another is the vacuum lines. make sure they are connected right..a simple thing like vacuum lines can be a PIA for turbo cars..

 

Yes, Take off the wastegates and make sure they are fully working not just looking at there inlet. Spring and valves get stuck all the time. Are you using Tial wastegates?

 

i had the same problem backin my old supra.. i replaced it with a new one then i looked at teh old wastegate.. and he damn thing was just sticking..

sounds to me liek a wastegate problem...

 

I called PES this morning and they think they have found the problem. (fingers crossed, praying) They put the car up and under heavy boost starting poking around and found a big leak near the intake. This leak did not occur during idle as they had pressure tested the system several times. They will hopefully have it resolved today. But I am not holding my breath.

mpwrmodena: Yes they are Tial wastegates

 

i had the same problem with the intake leak,

the dealer had to take the engine out to raplace the intake gasket because it is at the back of the engine


hope it work out for you.


boris