I currently have a a GT28R turbo which as I understand is actually a GT2560R using Garretts terminology. Which other turbos will fit straight on without any further mods.

I have all the other supporting mods just looking at what turbo options I have.

RS, RSR, 2871R, 3071WG

what kind of power are you looking for?

Am I right in thinking that
R = GT2560R
RS = GT2860R
RSR = GT2860RS

rsr is a gt28r with a RS compressor wheel.

rs = gt2860rs (aka Disco Potato)

OK so if

R = GT2560R
RS = GT2860RS
RSR = GT2560R + RS Comp Wheel

where does the GT2860R fit in?

Sorry is these are dumb questions but am a bit confused.

GT2860R has a larger trim than the GT2560R on both the compressor and turbine wheels, also a slightly larger diameter turbine wheel. Effectively the GT2860R will flow more but spool up slightly slower than the GT2560R.

The GT2860R has the same compressor and turbine wheel as the GT2860RS but appears to have the housing designed for skylines so I would ignore it and decide between the GT2560R and GT2860RS.

Thats whats I figured but want sure. I already have a GT28R (GT2560R) so I guess the next step up would be a GT2860RS

it would be, but what are your current mods? With an RS you will be starting to push the internals!

Trust me!

h2ypr (Ross) upgraded from a GT28R to an RSR, so he might be able to tell you how much of a difference it made.

tick, tick, tick, tick, boom!

sure - if you run 1.5 bar! Gt28RS will make over 300bhp with ease at a shade over a bar of boost on a well setup car.

that was only special occasions it was actually set up for 1.4 bar, but was mapped at 1.5! very little difference between the two! most of the time it was ran at 0.9 so it didn't use WI!

If you are going to go for an RS, dont go for much more than 1.1bar at redline IMO

I don't have any forged internals or headwork, just the usual PA FMIC, PA SIP, Apexi Filter. My current EBC will be replaced with an R spec Blitz ID3. Clutch is also being replace with a Helix Organic. Other Mods are DBA front disc, 3G rear disks, Yellow stuff and Textar Pads.

Would be looking to get the car live mapped as well

Hyperlink, do you have Cosmo's old car? If so is it still running on a standard exhaust?

yep - Robs old coop

Scorpion cat back with standard cat and downpipe with vband adaptor

My ears are burning.

I always wanted to put a Hayward and Scott 5 stud flange downpipe and big exhaust on it.

Charlie at SRR reckoned with a better exhaust and boost control it would have been well over 300bhp.


Is the clutch holding up Mark or is it starting to slip?

I wondered how long it would take you to find this thread

Not sure about putting a downpipe on as it seems that your lose low end torque. The boost controller is playing about hence its being replaced and the clutch has just started to slip on high boost. I dont think its too bad as its probably done 40k with your mods

You don't want to lose low end torque but want to change to a bigger turbo?

I'd buy a blueflame exhaust and sell the cat back. Sticking a bigger turbo in will just give you backpressure issues IMO.

I didnt actually say I was going to change my turbo just which would fit without more mods. I am just wieghting up options and yes I would like to limit the lose of low down torque which I understand is side effect of larger turbos and higher flowing downpipes. That doesnt mean I wont if the gains are worth it, just that I not bothered about gaining afew extra horses at redline at the expense of low down torque if that makes sense.

To be honest I thing that I will probably stick with the GT28R, which with the better controller, live map and either decat or sports cat should get me circa 300 bhp.

You'll be well over that figure Mark. It was 296bhp on the rollers as you've got it now.

Wow, 40K, after the mods, eh?

Must have done a reasonable job fitting the turbo then.

yep its about 40k, I'm and 82k now and got it 47-48k i think.

And no you did a shite job - I took it off and did it again