First post!
Im after new turbo the t25 or the t28 i have had engine rebuild of scoff 285 cam and various other bits who has what on there car and what are the differences between them honest opinion.
First post!
Im after new turbo the t25 or the t28 i have had engine rebuild of scoff 285 cam and various other bits who has what on there car and what are the differences between them honest opinion.
New poster! (less than 10 posts)
Well thanks for the help lads!
My Current car has a T28 with standard cam... its pretty good, its got a good punch behind it.. but could do with a decent cam to push the engine further round the rev range..
But my other car has a T2/T25 hyrbid with the 285 Cam... Revs round to 7,300rpm... but runs out off boost at 4.5k ish....
I would go for the T28 personally
depends what youre intending to do with the poor ole 5 your going to obviously punish with that in mind...id say t28 for drag if using serious boost or definetly the t25 if for the road, odd track day, just my opinon mind..dont shoot me down
ive had a t28/t3 for the last 4 years, altho it give a good punch all the way to the redline, its a tad too laggy, i owned a raider during that time which was was basicly standard with cup mod, wire swap and that was a hoot to drive, near instant boost, will be going back to a standard turbo later on
A mate uses a T28 Rollerbearing with a 285. Seems to do the job. As Mr Clements said , it depends on what you use it for.
you're asking a bit of a non-question, it's the turbo equivalent of asking "what's better an escort or a sierra?"
New poster! (less than 10 posts)
When does a t28 kick in? and a T25? I have fitted a turbo to my car thats apparently a gt tuning he5a dont know th A/R but dont get full boost till 3.4K, pulls much better than standard and easier to get off the line though.
I have an he5b. Full boost is there at 3.2k. I like itOriginally Posted by TomH
The chap who did the 11.9sec pass was using a Tomcat spec turbo. Not a Tomcat, but one with the same size parts. That would make it a T25 I think? What ever that means.
Won't lag as much as some big T28. It's 'useable' for a road car, but obviously works quite well on the strip too.
That was Bushy, I can't remember his first name. It was a T25 hybrid with the .49 back end, we built that for him a few years ago now. His terminal speeds weren't as quick as people with T28's though.
I had the same turbo as Lloyd (Bu$hy) & managed a 12.7 @ 108.8 but with a better driver & some cam changes it may have gone faster.. wasn't bad on the road either, i liked it, didn't hit full boost till 4k though... but still had loads of torque lower down anyway when i ran it at 1.5bar + so never bothered me.
That was his name, Lloyd.
Lloyd didn't drive the car when it did that 11.9, it was a mate of his. And iirc his terminal speed was 111 or 112mph.
I've seen bushy go through at 115mph a number of times, thats making GOOD power, lots more than most guys with T28, more than Mr spencer ever did, and GT Tuning, and EP, and anyone else pretty much. Only 1mph behind my best C1J trap and I ran a much larger turbo and more boost than him.
That one run was a low trap for him.
Also, don't forget that Stuart clark did his quickest runs on a full T25 (well, GT2554), essentially a very similar compressor and turbine. He makes more power than you'd think possible from a 1.4v 8v.
There's something good to be said about full T25's, I tend to think that the extra lag of the bigger T28 compressor is hardly worth the tiny gain thats returned from the more efficient compressor - which, ofcourse, is ONLY more efficient if your making enough power to utilise it properly, IE, more than 200hp.
My bad.I've seen bushy go through at 115mph a number of times, thats making GOOD power, lots more than most guys with T28, more than Mr spencer ever did, and GT Tuning, and EP, and anyone else pretty much. Only 1mph behind my best C1J trap and I ran a much larger turbo and more boost than him.
That one run was a low trap for him.
Funnily, after he did that run, we sold a fair old few of those turbo's. It seems people are still struggling to get the most out of them.
Out of curiosity, what was Mike's best terminal? I only remember him going through at 110mph...
adam, whats the exact spec of this t25.? how much would one cost.?
I can't remember the trim size of the compressor wheel, and it's a pain to measure up because the blades aren't opposite eachother like most others, so you need to measure the compressor housing inlet. I can't remember the size of the turbine wheel either.
To put it simply, it's the same shaft used in the 200sx/Rover range, along with the compressor wheel. 360 thrust bearing, twin collar, double piston rings on the shaft, the rest is just the usual malarky.
£560 exchange.
Best £560 i spent
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