Highflowed Ct26.

[Just1n_mc]

Guy's I can get my hands on a high flowed CT26A off a MKIII supra. The question I have is has anyone changed there ST165 to one of these turbo's?? I know it's pretty much bolt on but i'm not sure as what to expect as far as lag goes and any fueling issues that may arise from the upgraded turbo. I currently run my car on about 10-12psi and was hoping to do much the same with this turbo.

Any information would be greatly appreciated as i'm relatively new to this turbo business.

Cheers, Justin.

[CHB]

i've bought myself a CT26A off 7MGTE as well.
how much a stock CT26A can push actually? i didn't managed to find the efficiency map for it as well..
there are more photos than the technical spec of the CT26A on the net. can some one share the technical spec of it such as compressor/exhaust wheel trims, intake/exhaust housing A/R and so on? cheers...

[BeRad]

steel wheels so as much as you dare ......

[CHB]

but there were debats over the the efficiency map which some may claim that it just blowing hot air above 15psi??

[tooch]

but there were debats over the the efficiency map which some may claim that it just blowing hot air above 15psi??

All turbo's blow hot air, the higher the boost, the hotter it is, that's what proper intercooling is for

The problem with CT26's above 15psi is that they just can't hold the higher boost at all. The exhaust housing is very restrictive and doesn't allow enough exhaust gases to escape at higher pressures, which basically chocks it up and the boost falls. ATSracing in the USA made a 'CT27' which was basically a highflowed CT26, but they machined out the exhaust housing also. Gets some decent results, but I'd put the money towards a Garrett or TD06.

[Just1n_mc]

I thought that was why people used the Supra CT26A, cause it had a larger exhaust housing.

[tooch]

It is larger, being a single entry instead of twin entry, but I believe the housing is still rather small. It is better at higher boost than the twin entry's though, you're right.

[CHB]

i used a TD06-17C on my 3TC once but its not really suitable for it. accidentally i found out my TD06-17C was originally from a diesel engine, which it was designed for full floating application(without wastegate). no boost ever make from it.. so it waste lots of my time n effort to make my "turbo" 3TC.
now i'm on my way fabricating a new tubular manifold for my CT26A.. hope everything is ok..
bout high flowing a CT26A, i think ppl fit a larger trim compressor wheel on it and have the steel exhaust wheel "clipped" to allow more gases flowing thru the hot site...

[Andrew162]

a little something I pulled off the GT4 Yahoo group discussion earlier, might be of some help... I know ST165 owners will find this useful too.

(regarding turbo mods), what matters is flow. The CT26 max flow gives you around 14psi at 4200RPMs, and starts falling off rapidly down to ~10psi by redline. The celica CT26 is hotside-limited much more than compressor. A lot of people do the hybrid MA70 hot side and CT26 cold side with an upgraded inlet wheel, to address both sides of the equation. If you do that full upgrade, you can hold 15psi or more all the way to redline, depending on what level of upgrades you go to.
In terms of horsepower, say the stock turbo was good for 275 horsepower, then the supra would be good for 300 hp (on our cars) based on percentages, it's not that much bigger, but it will carry you further. If you are putting it on an ST185 you can bump that figure a little higher due to the response of the Twin Entry System. That would put you close to or above the power of the ST205 turbocharger.

[triptek]

I'm running a 7mgte ct26 high-flow on my 3sgte. It's a 60-1 compressor, i'm using the 7mgte steel turbine wheel. And i'm running the 3sgte twin entry exhaust housing. At the moment it's running 17psi which comes on at full boost by about 3600-3700rpm. This pulls all the way too redline (8000rpm). Compared too before it would drop off at about 5500-6000rpm.

I know this is not a ct26A but i thought i'd just add what i'v got and what it does.

[Just1n_mc]

I though the Supra's only ran CT26A's and the Celica/MR2's ran CT26's, and later CT20B's.

Did the Supra's run CT26's also??

What then is the difference between a Supra CT26 and CT26A???

[triptek]

CT26A has a bigger compressor wheel compared too ct26. And yes the supra's run both. Turbo A model's had the ct26A.

[CHB]

i'm quite confused about the compressor code. lets take 60-1 compressor wheel as example. what is the manufacturer it and what does the 60-1 means in relation with the compressor inducer and exducer?

[Just1n_mc]

So are both the Supra's CT26 and CT26A single entry?

Are they the same but with different internals??

[triptek]

So are both the Supra's CT26 and CT26A single entry?

Are they the same but with different internals??

Yeh there both single entry, main differance is the internals.