So what does it take to safely rev an rb20det to 8k or higher?

[SuicidnS13]

So guys what does it take to beable to rev up a stock bottom end rb20 to 8k or higher? Is the bottom end balanced/strong enough to rev to 8500rpms with just valve springs/retainers and cams in the head? Im asking because I want to beable to have the revs needed to spool a larger turbo like an hx35, sc61 or gt35r for the freeways.

[jdmser]

Everything you mentioned and a crank collar and appropriate oil pump. Does no good to spin it up that high if your not getting oil where it needs to be. That being said, I had no problems spinning to 8k with Tomei spring, cams, N1 pump, and collared crank. Best make sure the ignition can handle those rpms while your at it.

[SuicidnS13]

What is the extended crank collar for? Also is the n1 oil pump a straight bolt on or will I have to have some machining done?

[raremotive]

Short drive, only 1x1 cm drive surface on the oil pump. Soon as the semi-counter hits at the higher rpms the crank flex which can really mess up the oil pump.

All in all. You really don't need to rev too high for power, just be sure to pick the right cam durations.

Short:Long:

[Carryl]

I had tomei 270 degree cams and revved to 8.5k, took the cams off and i'm revving to 8k, engine is internally stock otherwise. I've also seen another local rb20 rev to 9000 rpm with nothing but jwt ecu. Don't get me wrong not saying its safe or smart but its possible.

[DriftingisLame]

Apart from the oil issue. The bottom end of an RB20 is extremely well balanced, probably due to the very small stroke. The super burly rods, and tiny pistons they have to carry, and well balanced crank are definately not an issue. In fact I've heard of 9500 rpm with standard bottom ends, I myself have turned my motor to 8200 with a stock motor (plus bigger cams and bigger turbo). I think the only issues you will have are making power at a higher rpm, and the hydraulic lifters.

I dont see a problem with 8500 provided you have the cams and turbo to see power at that rpm, and provided your oil pump drive doesnt round off. Any higher than that and you could spend thousands on bigger cams, solid lifters, aftermarket oil pump, with restrictors, return lines from the head, modified oil pump drive, etc. The list goes on, and the money will really be flying out of your wallet if you want to go much higher than that, lol.

[Carryl]

For what its worth i run a t67 and power doesn't fall off until 8200 there about

[SuicidnS13]

For what its worth i run a t67 and power doesn't fall off until 8200 there about

When do you get full boost on your rb20 with this turbo?

[Carryl]

i run the smallest exhaust housing 8cm.... wastegate is set at 11psi and i see it by 4000 to 4500 rpm...

[Coolwhip]

whats with the need for hi-revving engines? If there is anyway you can go about thrashing a motor is revving it till you have all sorts of vibration issues inside.

I say stick to a turbo that makes power without over revving your engine. What are you HP goals anyways? Looking at the turbos first listed looks to be close to 500hp.

[SuicidnS13]

I currently have an hx35 and a t3/t4 60 trim sitting on my shelf. I am going to run one of them for sure. Just want to make sure I am going to have enough rev capability to make use of the turbos efficiency range.

[DriftingisLame]

8000 is enough, thats probably where you'll stop making power anyway. An 8cm housing is tiny for a turbo like the t67, although I believe you're talking about the greddy version of the t67 which is much smaller.

[Carryl]

yeah it is the greddy unit ..should have said td06SH-25G

[SuicidnS13]

8000 is enough, thats probably where you'll stop making power anyway. An 8cm housing is tiny for a turbo like the t67, although I believe you're talking about the greddy version of the t67 which is much smaller.

So for only a 500rpm increase I should still bolt up the n1 oil pump? Are valve springs even required for this rpm increase?