T2.T25,GT28R comparison
 

Just thought id show of my new Gt28R turbo:D The pictures dont really do the size of it justice however i didnt expect it to be as big as it actually is.
http://i41.photobucket.com/albums/e2...2/P1010187.jpg

yeah that is pretty big:D what revs do you expect it to hit full boost at?

Well if the reasearch is correct it should make the 18/19 psi il be running by 3500rpm and hold it to redline;)

Pmsl, why is the T25 sitting on a calculator?

Because its working out how many magpies it could fit down its housing:D

got a piccy of a t28 (same externally as a gt28r) and a GT28RS but it's 700+k, kind of excedes the 39k limit for uploads :wack:

resize it in photoshop then:)

Think im going to tap straight into a suitable part of the compressor housing for the brass nipple as opposed too the i/c pipeing, i just found it odd as to why they dont come with a nipple already in place?

http://i133.photobucket.com/albums/q...y/IMAG0023.jpg

and this is the BIG bastard. GT2876R

the s14 has a take off in the boost pipe just after the turbo

Do you have a picture of this? I dont suppose it makes much difference though does it?

the t28 in that picture has the take-off tapped into the elbow bolted onto the outlet, it's my old one. In my experience taking the feed from after the intercooler will give more stable boost as it's telling the actuator what is actually happening just before the plenum rather than just after the turbo. it helps to account for boost drop across an intercooler

that thing looks huge :D ,sorry if this has been covered before but are forged pistons, stronger rods always needed with these turbo's or is the std. ca18et short motor ok?
My T25 gives me all the boost I need but i wonder how much more it would take before things started breaking/melting :eek:

I've stripped an ET bottom end completely for the first time recently and the rods are really puny, the pistons seem to be made of cheese too. IMO the simple upgrade to DET rods and pistons is well worthwhile as they are proven to over 300bhp

There certainly capable around the 250 mark though:)

So whats the simple upgrade involve?

remove the old standard ones and fit standard s13 ones

So what about getting the bores rehoned and do they fit straight onto the et crank?

ok maybe i simplified a bit too much, but honing the bores and fitting new rings should always be done anyway. big ends are the same, you should always use new bearings

my actuator signal is taken from the plenum, not the turbo housing or boost pipes

Could you post a picture of this please?

Do you not get wicked boost spike having the pipe that long?

hadnt thought of that, but yes you could well do if running it direct to the actuator. my actuator signal goes from the plenum, thru an Audi TT boost solenoid then to actuator and is controlled by the ecu. Your Omex new should be able to it too. makes it possible to alter boost infinitely thru the rev range and removes spikes.

actuators don't like vacuum

Well il be using my mbc valve inline until i get an electronic boost controller:)

afaik the boost solenoids have a oneway valve in them.

got myself a gt28r on my det, its a nice turbo, goin for 300bhp now that the cars off the road again lol:D