High Rpm Rb20

[r32gtst sedan]

Hey guys thanks for all the replies im suprised by the support i knew i was gonna get the "Just get a 25 they are way better" but i dont want to do that. As for low down i was thinking in the end a getrag 6 speed but that costs a shit load so that can wait. For now im just going to do the bottom end and when money permits start building a head with all the gear. Does anyone know if Tomie still manufactures all there gear for Rb20s because i know they used to have a pretty comprehensive range. And thanks for the tip on GTS ill have a chat to them as they came out and did some quotes a while ago.

Thanks

Cameron

[Roy]

By building a head just stick with the basics and dont get carried away with porting, unless you are willing to get it wrong a few times. Solid lifters, some baby duration - high lift cams and some decent valve springs would do the job. I have Tomei cams, springs, retainers, RB24 pistons etc for an RB24. With a 26 crank it should be pretty decent for 9,000rpm if its screwed togehter correctly. The bigger problem is what to do with things like power steering pulleys etc which are driven at the wrong speeds at those sort of rpms.

To spin it up to 10,000rpm i think just stick with std bottom ends and just uprated cams, springs, oil pump and inlet manifold. The std inlet manifold falls off power after 7,000rpm where as aftermarket ones seem to hurt response a little but give you more top end. If the thing throws a rod then so what. You have transferable bolt ons that can go the next $400-600 wrecker engine. Rather then some $8000 motor with a lot of fruit

[R31Nismoid]

I love how you dice with death

Although that said, I think we'd all love to see someone run a stock bottom end to 10,000 for a while just to see what happens.

Bets on #5 or #6 rod for me! Remember though if it throws a rod, head damage could indeed occur so it's not like he can just bolt on/off if it does shit itself in a epic fashion.

In all seriousness though Cameron - whilst everyone will always say the bigger motor.

You do need to remember you have a GTS4. A normal R32 GTS-t - ok not so bad with a 2ltr. But the extra weight, 4WD - you are pushing poop up a hill before you even start which really is the major disadvantage over and above anything else.

Perhaps not "what RPM", but what is the use of car and power you are chasing to perhaps look at this from a different angle

[zoidbergmerc]

can the flywheel cope with being spun up to 10,000rpm, I'd be worried about that bad boy letting go and chopping my legs off.

Apart from that, it'd be pretty epic revving it's nut off. Go for it!

[r32gtst sedan]

Hey guys well for now im going to build it so i is capable of high but i only have an rb25 turbo for now which is gonna do shit all at such rpm. So ill buy the gear put it together get it balanced and run in and leave all the other gear standard. And as for keeping stock internals well the main reason for this build is the pistons had a shit load of play. So i have a strong starting point for any modifications in the way of power it comes down to turbo selection to get the right power band i suppose. I dont expect this to get of the line great but drop a gear or 2 and it should go sick.

Thanks

Cameron