CT housing debate - as per Smiler's thread

[Thuppu]

I don't know Mike's exact setup, but if he's gona use ported head and some sort of custom cam setup, the benefit of a bigger hot side comes on higher rpm's, of course with some cost of spool. All is what you wan't. If you wan't the powerband to rise all up to the redline or wan't a descending powerband. RWD19T's dyno plot shows nicely two different kind of power bands:



With the .84 housing you propably get something like 900 degrees EGT wich is ok for all day track use, if you have need for that.

[Jamo]

Not the best screenshot as the dyno plot is comparing a 2.2 setup to a 2.5 stroker set

This is a better example http://www.s2forum.com/forum/showpos...9&postcount=71

Also note the amount of 3076r users on 2.2 dropping down in hotside size

[Thuppu]

Oh, I thought the turbo was the only different on that one, didn't check it properly, sorry. Bigger hot side should rise the powerband upwards some bit. Also the spool rises to higher rpm's of course as mentioned before.

Ok, it seems that RWD19T didn't get so much out of the bigger hot side after all, if I read the plot right... Of course there is ported head vs stock.

[A80Avant]

Not the best screenshot as the dyno plot is comparing a 2.2 setup to a 2.5 stroker set

This is a better example http://www.s2forum.com/forum/showpos...9&postcount=71

Also note the amount of 3076r users on 2.2 dropping down in hotside size

That's me! But it goes with what the user wants as well..

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[Thuppu]

For some reason RWD19T uses .82 hot side on the latest setup after all. But, I doupt Mike gona build a customized setup like as JP's, so maybe the .63 housing would be better for him.

[Jamo]

He uses .82 because of the stroker application

[Jamo]

That's me! But it goes with what the user wants as well..

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Yes also Aronmatic2 went the same way so did RWD19T and 4wheeldrifter all dropping to the .63 hotside on the 2.2

I'm always a start small then go bigger

[Billman]

maybe the turbine impeller it too small on the GT3076 to give a major advantage with 0.82 AR so people prefer the 0.63 for the better spool.

[A80Avant]

Yes also Aronmatic2 went the same way so did RWD19T and 4wheeldrifter all dropping to the .63 hotside on the 2.2

I'm always a start small then go bigger

You will get there, you just don't know it yet

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[Jamo]

maybe the turbine impeller it too small on the GT3076 to give a major advantage with 0.82 AR so people prefer the 0.63 for the better spool.

This is my point exactly Europeanme turbo has a smaller turbine than that of a 3076r

[europeanme]

0.63 it is then....

I must start a project thread or at least update my old one.....

[Bram]

If I remember correctly and Bram can verify, he was seeing up to 1100C at 2.1bar at the redline on the CT355.

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This was due to my crappy exhaust system at that time. Normally 0.63 AR CT hotside will stay in safe temp margins so you can safely run a 0.63 AR hotside on track days. Jyrki Repo can back this up by log data on the many 0.63 CT turbo tunes he did

[A80Avant]

what exhaust were you running? i thought it was a 3inch without any catalysts

[Rocco]

what exhaust were you running? i thought it was a 3inch without any catalysts

and a full 3" is crappy?

[Jamo]

3" is only the pipe size, the difference in exhausts are the boxes, some boxes like the borla generate little back pressure some are quite restrictive adding a lot of back pressure.