Turbo to produce 400hp at wheels?

[Roy]

This is what i had intended to do to my RB20...but with an OS holiday next year and work etc, i cant really see myslef doing it.

Bore the engine to use 81 or 82 mm forged pistons, balance and prep std rods and crank, serviced head, with some basic match porting and cleaning up, GTR oil pump, 8.7:1 compression, 264 cams and new valve springs. HPC coated valve faces, exhaust valves stems and combustion chambers.

If i could score an RB26 crank and rods off a friend for the right price i would also use those as the additional cost for machining was only another $200.

So for about $4500-5000 i would be able to run 1.5bar from my TD06 and use a 8,500 rev limit. I would expect a damn strong 250-260rwkws with full boost coming on strong at around 3,600-3800rpm. Then as a T67 bolts to my current manifold and dump,

300rwkws would only be a turbo change away less the sale price of my TD06.

[mtopxsecret6]

Ok guys, this has opened a real can of worms. So lets get back to the main topic hey. Im not too worried about gearing and speeds of silvias and skylines etc. Basicly, for the show, the next project car is the skyline, and our aim is to make the toughest R32 skyline, using the RB20 motor. The RB25 and RB26 are all good and stuff, but how many kickarse RB20's are there? None that i know of. So, basicly, all i really want to know, is what turbo setup should i use to gain that power figure. It really doesnt matter if its for track or drag or street, i really dont think that is an issue. Basicly the car will be showed around aus, so we can eliminate that issue. The gearing is all well and good, but im not worried about what power it will be making at what revs and gears, all interesting though. It is a decision between doing a single turbo setup, or a sequential turbo setup. The rev ranges are general ideas on where we want boost to be at. I would prefer them to be lower and flow right through.

As this is a sponsored car, anything is possible.

[mtopxsecret6]

This is a rough idea on what will be done to the motor.

New forged cams

Metal Headgasket

port/polish

forged pistons

forged crank

Block shot peened for strength.

Blue printed

Larger sump with baffels

12a injectors

Larger fuel pump

Computer

New turbo with external waste gates. Either single or twin setup

All intake piping

Largish intercooler( From boonet to bottom of gtr lip, and spotlight to spotlight. IS a biggen)

Larger throttle body

Larger plenum

Tuned intake manifold piping

Tuned exhaust manifold piping

3.5inch Twin dump

3.5-4inch exhuast( but retaining quietness, well, close... maybe not..?!)

New 6 speed box(possibly s15 box. Have parts strengthened for the job)

Double or triple brass button( has single now, is bitch to drive with)

Strengthened tailshaft

Diff, not so sure. Have been told will handle power. Well, everything bar the box will handle the power we have been told. But doing all the work to make it a bulletproof setup. What want the power, and the reliabilty. All persons involved say its a reasonable goal, and is a piece of cake.

AS i said before, with sponsorship, anything can be done.

[rbs13]

use a rb25 gtst gear box..

[Steve]

Different story here - before it was 400rwhp with good boost under 4k

agree with rbs13 go rb25 g.box - tough as nails

also, I would suggest something like an OS Giken twin plate - nice take up and will easily hold 400rwhp.

Turbo - Something like a HKS 3037, 3040 or garrett GT30 or GT35R, also as suggested T67 (but will be a bit more laggy).

Something like a 3037S 56T with a 0.73 turbine AR, around 1.5-1.7bar bar(use a 0.87housing if you dont want to have to use that much boost pressure, but from the sounds of your build up the engine wont have a problem) and you will have 400, or if you think you may want to try and get a few more ponies out for dyno comps, try a HKS 3040, but you will probably find it a bit more laggy, maybe another 500+rpm.

Some suggestions anyways.

[Roy]

All persons involved say its a reasonable goal, and is a piece of cake.

Well since it seems like you have sponsorship and ppl building the engine, they will best be able to tell you what suits your needs.

Something like a 3037S 56T with a 0.73 turbine AR

Thats two votes.

[mtopxsecret6]

Thanks for the replys guys, just wanted some feedback from the people who know the skylines the best. We dont want to be wasting time with people thinking this should do it etc etc.. What do you guys think for a twin sequential setup?

[Roy]

I wouldnt use a sequential setup, if you need more low end repsonse, then id plumb in a nitorus kit before trying to get a sequential setup running.

[rbs13]

agree with roy there.. but a twin t25's should work.... and boost up.. that would cut costs down.. as the turbos are cheap but the manifolds mite even up the cost compared to a big single.. if u want a drag car.. go auto with trans brake and a stally.. use the nos to bring the turbo on.. and you WILL run VERY quick times.. no fun for the street tho.. just suggesting some thigns.