ct-26 on 18psi!!

[clem]

Hey guys my friend did a swap in his tercel with a 4age motor and he used a ct26 the turbo came of a gen 2 3sgte motor which was completely stock! the guy is running 18 psi on the ct26 and he`s been doing it for almost a year and a half

[MRQtwinturbo]

theres no real point to running 18psi...after 16psi its just blowing hot air...and i'd have to see with my own eyes to believe that a 4AGE could handle that much boost....

[BDSL]

You can push the CT26 to 20 or 25psi but it doesn't mean you should. Since there is no compressor map of CT26, a lot of MR2 owners speculate 16psi is the max that we should push....anything beyond that point, the turbocharger isn't very efficient.

[Nad1370]

He might be spiking to 18 but not holding it to redline.

[MRQtwinturbo]

this is on a 4AGE motor also..not a 3SGTE...

[JekylandHyde]

Originally Posted by MRQturbo

after 16psi its just blowing hot air...

That's not actually accurate.

What happens after 15 psi, is the turbine housing becomes a serious restriction to flow. As more air is forced into the engine, it can't be exhausted fast enough so it starts to have reversion.

That is when the dirty, burnt up exhausts starts to get pushed back into the combustion chamber ... since THAT air is hot, dirty and burnt already, it greatly increases the chance of detonation.

The air coming out of the compressor is not any hotter than it would be at 16 psi on any other turbo.


As for the set up in question, just because people do it does not mean it is recommended.
The minute amount of extra "hp" you are getting for 2-3 psi at the top of a CT26 does not justify the risk to the whole engine.

[clem]

i will take pics of the car so u guys can see!

[clem]

on and by the way he doesnt run 18psi everyday its only when he`s on the track