Rb26 Twin Turbo Upgrade Specifications - Would Like Specifics With Models, Sizes Etc

[sneakey pete]

I'm certainly going to be interested in your results when they arrive, we seem to have a similar end goal.

[The Mafia]

-5s + 3L will do it easy haha

If it was a dirty old BNR32 or BNR33 I would go 3L but I want to keep the GTR about it lol.

Mafia, are you planning on stroking this at any stage or strictly a stock engined car? If not, a set of -5's and a step 1 v cam which you can use with stock pistons will definitely help you reach your goals.

Stock at the moment. Considered adjusting cams but funds aren't that plentiful at the moment. I'm just chasing replacements for my -5s.

This is what ATP have said. Looks like they only have options for the GTX2863 and GTX2867 at the moment which are too large for what I want.

Hello Jonathan,

Thank you for contacting us. We offer the GTX2863R and GTX2867R upgrade solutions to the stock turbochargers. The turbine and compressor housings bolt-on to the stock compressor inlet, turbine inlet, and turbine outlet.

Product details (NOTE: GTX2863R and GTX2867R are upgrade options under related parts):

http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=GRT-TBO-075&Category_Code=RB26

Feel free to contact us for further questions.

Thank you

[The Mafia]

Doesn't look like they offer a solution:

Hello Jonathan,

We do not offer a bolt-on solution for the GTX2860R.

The provided link is a GT2871R with the option to upgrade to the GTX2863R and GTX2867R. The GTX2863R and GTX2867R are the only available GTX series options within the Skyline housings.

Thank you

[The Mafia]

I've added the GTX2863 to my cheat sheet. It looks like it was made to be the -5 equivalent.

Does anyone think the different lower trim would help it spool? Need some experts in here to talk to me about the specs

[The Mafia]

ATP are pretty helpful, they just sent this:

Hello Jonathan,

No problem. On a typical 2.0L setup, the GTX2863R spools about 100 to 150rpm slower than the GTX2860R.

[Piggaz]

Simon did a back to back with -5's and 63 mm GTX wheels in -5 housings. Made an extra 90 hp through the middle and 50 up top or so. I have the graph in my phone somewhere. I'll post it up this arvo after work. That was on a RP 2.8 though.

I'm sure those results are on the GTX thread. Go back about 12 months.

[Piggaz]

[infamous_t]

More power and earlier on?

Seems to be a flawless win-win, bar the additional cost of the GTX over GT

Any idea on boost levels on both runs?

[The Mafia]

That's a really nice plot. Can anyone give an idea of what rpm vs speed between 90 and 130?

See with this sort of upgrade, the GTX2860 (Slightly smaller) would be earlier and even more responsive with a nice top end

[Piggaz]

That's a really nice plot. Can anyone give an idea of what rpm vs speed between 90 and 130?

See with this sort of upgrade, the GTX2860 (Slightly smaller) would be earlier and even more responsive with a nice top end

I've plotted it over my graph which has rpm. I'll dig it up tomorrow for you.

They are on 2.8's though.

[Piggaz]

Found it!

Dotted is 63 mm in -5 housings

Blue is -5's

Both on E85

Both 2.8's

[The Mafia]

Does that seem pretty laggy on a 2.8? My -5's are all in (18psi) at 4800rpm. (Standard motor)

[Piggaz]

I suppose looking at a line on a piece of paper only tells half the story.

[r32-25t]

There was nothing laggy about piggaz set up