CT26 and CT15B and CT20B differences

[J0RD0]

hey peoples, ive heard some rumors that the CT26 and CT15B (1jz vvti turbs) are similar though not sure about the CT20B. If anyone has a CT26 lying around would you be able to take a couple of pics and take some measurements of the exhaust flange and dump flange? I have a spare CT15b here to post up, will do it later tonight though

Thanks!

[Cuts]

ct26 single entry (larger) -------- 7m-gte
ct26 single entry (smaller)------ 3sgte (gen 1)
ct26 twin entry --------------------- 3s-gte (gen2)
ct20B twin entry --------------------3s-gte (gen3)

i have both spare ct26 and ct20b kicking around, ill take some pics 2mora if i remember.

but i daresay the ct15B will be a bit larger

[J0RD0]

i read that the CT15b is 25% larger than the twins put together on the non vvti. this information came from the interweb . . . so it MUST be true!

[Cuts]

haha naturally.

i often thought how much better a ct15b would be then say a ct26.

ide assume all ct15bs are ceramic? where in adm ct20b (like mine is) is steel so it loved 20 psi day in day out

[neal]

No photos yet?

[J0RD0]

yeah got a bit slack lastnight

[Cuts]

left ct20b, right ct26

[manny]

i read that the CT15b is 25% larger than the twins put together on the non vvti. this information came from the interweb . . . so it MUST be true!

The interweb strikes again - someone who has neither had the two side by side nor done the math - more like the twins are ~20% larger !


This old pic of mine may help in a few comparisons

[{Mr Crabs}]

Hey Cuts could you edit your post i'm not sure what the housing pic's.are they only of the ct26?
Good thread though.

Case

[Cuts]

the exhaust side is all ct26, you cant tell any difference between the 26 and 20b by looking at the rear housing inlet or outlet.

[{Mr Crabs}]

So it's the same bolt pattern as a single entry 7m ct26?

Is the 3s ct20b the same as a 2J turbo.

Cheers Case

[Cuts]

nooo, the twin entry turbine housing i posted earlier is the twin entry ct26. which is the same patturn as the twin entry ct20b

the ct20b is a great deal different (in both front and rear housings) to both the ct20 found on the 3t-gte and the ct20a found in twins on the 2jz.

[shezyworld]

sorry to bring back such an old thread. searching for some useful information regarding my query. wanted to know the potentials and capacity of replacing/upgrading the two ct12b with two ct15b i have in my store. i just got a 1jzgte nonvvti motor imported from japan, just a thought of changing the turbos to a bigger size while keeping the cost in mind and keeping it twin configuration.

i know people will suggest to put one big turbo rather than using the two ct15b but i have budget constraints and while i have the turbos laying free so its a good option. but cant find on internet that anyone has done this.

[Biggus]

It depends on what you are trying to do.

I would say that for me, it isn't worth the effort to change to 15bs when the 12as flow enough to send a Soarer down the quarter in a bit over 11 seconds. 15bs also seem a bit more fragile than 12as too. I'd probably try to trade the 15bs you have for other turbos if you really want to replace the 12as.

[shezyworld]

It depends on what you are trying to do.

I would say that for me, it isn't worth the effort to change to 15bs when the 12as flow enough to send a Soarer down the quarter in a bit over 11 seconds. 15bs also seem a bit more fragile than 12as too. I'd probably try to trade the 15bs you have for other turbos if you really want to replace the 12as.

i am just trying to save my self from he hassle of upgrading the turbo later in time, bcoz the swap is happening right now and wanted to do the pipe fabrication once and for all. so was thinking of this idea to utilize the resources available with maximum benefit.

well, later on i thought of one more fact, that the ct15 needs a pressure of 6 cylinders together to spool, and when it will be fixed on 3 cylinders it will spool on high rpms hence making the motor slower than before. ct12 will spool better. whats your thought on this?