2860-5 Turbos A Good Choice For This Goal?

[Chris Wilson]

Was going to go single, but am now considering twins on ported stock manifolds, for the sole reason they never seem to crack, and if they should are cheap and easy to source. Engine spec is as follows, intended use track days, with occasional road usage, in a modded R33GTS-t

New ported head with stock valves, modded to take Tomei 280 degree cams with 10.8 mm lift.

New N1 block with 86.5 Tomei cooling channel pistons, Tomei steel rods and Farndon steel crank at stock stroke 9so still around 2.6 litre)

Matched stock throttle bodies on matched manifold.

Motec M800 running MAP sensor, no AFM's.

What is an honest and conservative at the flywheel power and torque figure on 2860-5 turbos? On pump and on race fue?

Will they shuffle on the road?

I don't want lots of lag, I intend to use 9K revs maximum. Don't forget car is a lot lighter than a GTR, and yes, it has proper brakes and suspension, and will run a none Nissan strong dog box, and a proper clutch

Thanks, any other turbos that fit the stock manifolds worth considering? 650 BHP should be plenty.

[Gav]

Was going to go single, but am now considering twins on ported stock manifolds, for the sole reason they never seem to crack, and if they should are cheap and easy to source. Engine spec is as follows, intended use track days, with occasional road usage, in a modded R33GTS-t

New ported head with stock valves, modded to take Tomei 280 degree cams with 10.8 mm lift.

New N1 block with 86.5 Tomei cooling channel pistons, Tomei steel rods and Farndon steel crank at stock stroke 9so still around 2.6 litre)

Matched stock throttle bodies on matched manifold.

Motec M800 running MAP sensor, no AFM's.

What is an honest and conservative at the flywheel power and torque figure on 2860-5 turbos? On pump and on race fue?

Will they shuffle on the road?

I don't want lots of lag, I intend to use 9K revs maximum. Don't forget car is a lot lighter than a GTR, and yes, it has proper brakes and suspension, and will run a none Nissan strong dog box, and a proper clutch

Thanks, any other turbos that fit the stock manifolds worth considering? 650 BHP should be plenty.

The short answer to your question is that these terbs will probably be better suited to a track RWD car than a big single. A wide torque curve with slightly lower top end will be much easier to drive than a peaky "torque monster".

Shuffle can be almost eliminated by tuning and boost controller set-up. If you haven't already got a set of manifolds, consider a bridged manifold also.

Good luck.

Gav

[700HP-GTR33]

I don't believe lag will be a problem with those cams dialed in correctly.

Expect turbs to start spooling around 3K..

560BHP...no problems with the set up in question....-5's fitted to a worked and tuned motor cannot be beaten on track.

It will be responsive and will handle lots more horses than you mentioned.(running 1.3 Bar).

If you go to 2 Bar set on the boost controller..and you have a reliable motor to handle this, I would guess..on race fuel,

you would have 700+BHP

Good luck...and post up your results on the RB Turbo upgrade.