CA T25 vs SR T25 Quick question.

[Boozor]

Did a search, it wasn't very specific.

Are they the same? I've heard the CA T25 was smaller then the SR T25.

[RalliartRsX]

Major difference is in size and a few parts

- Turbine housing on the SR is .64 as compared to the .48 from a CA- Also, the CA T25 has a compressor nipple for the wastegate actuator so you dont have to find another vacuum source to run to your wastegate diaphram.- The wastegate diaphram mouting hardware is different (as in, the CA T25 diaphram WONT bolt to a SR T25 turbo or only one bolt from the CA T25 matches up to the SR T25)- The turbos are clocked slightly different (about 10 degrees)

I think thats it for major differences

[davidricardo86]

Major difference is in size and a few parts

- Turbine housing on the SR is .64 as compared to the .48 from a CA- Also, the CA T25 has a compressor nipple for the wastegate actuator so you dont have to find another vacuum source to run to your wastegate diaphram.- The wastegate diaphram mouting hardware is different (as in, the CA T25 diaphram WONT bolt to a SR T25 turbo or only one bolt from the CA T25 matches up to the SR T25)- The turbos are clocked slightly different (about 10 degrees)

I think thats it for major differences

- When changing to an SR t25 or t28 would you necessarily need to change injectors and adjust fuel pressure?

- I'm currently rebuilding my engine and about to start work to the head. I am budgeting in some JUN/HKS cams, stiffer springs, expensive retainers, new valves, guides, 5 angle valve cut, etc. etc. and maybe some kind of porting/machining. I was thinking about solid lifters but i dont think id like the idea of messing and redjusting it over and over periodically. Hydraulics takes care of that nicely. What would be my advantage to solid type? My guess is the fact that its a solid connection. No "squish" area for oil to burn up or just not keep up with the moving parts? Obviously its done for a reason.

- Am i headed for some ROM tuning aswell?

[themadscientist]

The SR the turbo in question comes from gets by with the same 370cc fuel delivery so you should be fine, just some fine-tuning. The solid lifters are for the high revs where a hydraulic might collapse and float a valve. Good-condition OE lifters on a warmed-up street motor should do you if they are clean. Chuck any from a motor that is sludged up as they will be too.

[float_6969]

The SR T25 also has a higher flowing compressor housing as well....

[davidricardo86]

Thanks for the response! Yeah i do want to be able to keep making power upto and see speeeds of 7K rpm possibly 8K rpm so i wasnt worried about the hydraulic ones. I have read on here that past that you should start considering solid type as the hydraulic wont be able to keep up with the speed. OEM units are the same for CA18DE & DET correct?

The higher flowing SR t25 & t28 can keep producing power till how many rpm? Ive also read that the CA t25 peaks out quicker than those on the SRs and that it doesnt keep making power all the way to redline like the others, what about this?

[float_6969]

That is completely true. I mean, it'll hold boost to redline, but it's out of it's effeciency range at anything over 10psi.

The SR T25 will hold 12-14psi to redline and still be OK.

The S15 T28, if I did my compressormap correctly, is good to 18psi up to redline. It'll do more, but you're really not as effecient anymore. I'd say 21psi max, and I wouldn't do that on a daily basis, by any means.

[davidricardo86]

I dont want to start a seperate topic but ive been wondering about this, whats the most lift and duration you can run on the factory hydraulic lifters? I am thinking about some bigger cams like the hks, or jun 264/272s for either intake or exhaust. I also want to change the valve springs retainers, etc. of course.

[float_6969]

Most agree that 9mm is the max lift on stock lifters. As far as duration, I guess the sky's the limit, but I wouldn't reccomend more than about 272 for the street.