CT20 CT26 Hybrid possible?

[GTSSportCoupe]

Does anyone know if it is possible to exchange the compressor and cover on a late CT20 'A' (90-93 2LTE) with the compressor and cover from any of the CT26's? I realized this would entail a full rebuild and balance.

I have a well tuned 2lte, and would like to improve my turbo efficiency a bit. Currently I'm running 15psi maximum (set by manual boost controller) through a water to air intercooler. I can hold 15psi to 4000rpm. This is about all the CT20 can do though, and I think I'm way out of it's efficiency range. I think it would benefit from a slightly larger compressor.

I was thinking of buying a used CT20, rebuilding it with the CT26 compressor side (perhaps from a 1hdt or 13b). I think this would increase my 40mm inducer to 43mm.

I happen to have a Supra CT26 compressor and cover which I've compared to my CT20 for fun. The Supra CT26 is a 47mm inducer, which is much too big for my needs (I think...). Anyone with a 1HDT want to trade compressor parts?

 

[o8ko8k]

sorry for being a bit off topic, but how do you like that water intercooler? does it heat saturate on the long hills?

 

[GTSSportCoupe]

sorry for being a bit off topic, but how do you like that water intercooler? does it heat saturate on the long hills?

By far the best thing I've done to my truck. Transformed the 2lte. No, it does not heat soak even under the worst conditions (like when I tow 2800lbs in 30C weather up the Malahat). Read more here: https://forum.ih8mud.com/70-series-tech/745872-lj78-air-water-intercooler-working.html

 

[mudgudgeon]

If you can get hold of the parts to build up a second turbo, it would be worth experimenting IMO. They share the same central housing, shaft and small parts (bearings, seals etc)

 

[BCR4619]

Too bad you didnt do this earlier it would have worked out perfectly.... but if I ever get off my butt and swap my supra hybrid in, Ill have a spare CT26 kicking around.... So ya know....

Interesting your supra wheel has the white paint on it, mine has the same but I thought it was the PO that painted it or something lol

 

[GTSSportCoupe]

If you can get hold of the parts to build up a second turbo, it would be worth experimenting IMO. They share the same central housing, shaft and small parts (bearings, seals etc)

I've been working on getting my hands on a worn out CT20A. If I can, I'm definitely going to experiment with it. Might even put the Supra compressor on it for the heck of it if I can. The current CT20A on my rig was rebuilt about 10,000kms ago, so I'm not going to mess with it.

Too bad you didnt do this earlier it would have worked out perfectly.... but if I ever get off my butt and swap my supra hybrid in, Ill have a spare CT26 kicking around.... So ya know....

Interesting your supra wheel has the white paint on it, mine has the same but I thought it was the PO that painted it or something lol

Sure, let me know if/when you have the spare 1HDT CT26 available.

Yeah, I was wondering about the paint on it too. I also thought it was from a previous owner. Weird.

 

[mudgudgeon]

I've found that in my area atleast, that used ct26 turbos rarely come up for sale. There are so many cheap chinese knock offs that genuine ones are seen as almost worthless.
I'd love to be able to pick up used ones to build up a couple of versions.

 

[GTSSportCoupe]

I've found that in my area atleast, that used ct26 turbos rarely come up for sale. There are so many cheap chinese knock offs that genuine ones are seen as almost worthless.
I'd love to be able to pick up used ones to build up a couple of versions.

Keep an eye on Ebay north america, as they come up there pretty often, and for a good price. I suppose shipping will be the challenge though for you.

There are a lot of dead 2lte's in my area due to the head problems, so the CT20's do come available pretty cheap sometimes. Just have to keep my eye out.

 

[Dougal]

Generally speaking extreme hybrids don't work very well. You end up with a turbine that produces too much shaft power at low airflow and drives a larger compressor wheel into surge. Then at the other end the small turbine can't provide the shaft power at higher flows that the larger compressor wheel needs.

The result is a turbo that surges down low, works okay for a very short rpm band and then chokes out the engine with excessive drive pressure and falling boost.

The only hybrids that generally work out are ones to allow larger or smaller A/R turbine housings than the factory options allowed or minor changes in turbine or compressor wheel size.

 

[GTSSportCoupe]

Generally speaking extreme hybrids don't work very well. You end up with a turbine that produces too much shaft power at low airflow and drives a larger compressor wheel into surge. Then at the other end the small turbine can't provide the shaft power at higher flows that the larger compressor wheel needs.

The result is a turbo that surges down low, works okay for a very short rpm band and then chokes out the engine with excessive drive pressure and falling boost.

The only hybrids that generally work out are ones to allow larger or smaller A/R turbine housings than the factory options allowed or minor changes in turbine or compressor wheel size.

Hi Dougal, thanks for your experience. Although I have a picture of the 7mgte compressor, that is not what I'll be using. I plan to only upgrade my compressor slightly. So an extreme hybrid is not what I have in mind.

I suppose I should not bother, and instead put my efforts into looking for something like a used GT2056 that is more modern and efficient. And build an adapter. It's just that I like playing around with OEM toyota stuff is all.