Got Over 400kw Atw?

[SiR_RB]

Not relieved mate

So what lift/duration would be optimum for my setup, for midrange and top end reving to 8500 max

Standard poncams? Or jun 272 8.8 lift? Etc so many options but I still don't know much about lift/duration and what's better, bigger lift and smaller duration or smaller lift and bigger duration?

[Piggaz]

I personally wouldn't go 272's. You're not revving to the moon!

Send a PM to XKALABA. He will have something VERY interesting to say about 250 vs 260 degree poncams.

[NXTIME]

And then post what he says so that others can hear what he has to say

[SiR_RB]

Ok thanks il pm him

What would be ur opinion on cam choice based on ur experiences?

[Piggaz]

Ok thanks il pm him

What would be ur opinion on cam choice based on ur experiences?

If you want throttle response (which is something you CAN'T see on a dyno) no bigger than 260. My 260's spun to 8000 on 25 psi without dropping off, on higher boost ( turbos were out of puff) peak grunt was 6500 but only lost 15 kw by 8000 rpm).

We are going to try a smaller duration and higher lift cam soon.

... Awaits micks post

[XKLABA]

thanks for txt Paulie, I went from 260 type B to 250 type R poncams, same peak power just everything happened 800-1000 rpm earlier on a stock 2.6 with -7s

Paul, your cams are what I would think are near perfect in lift v duration, and XKLABA only has two As

[SiR_RB]

What would you recommend for my setup?

According to piggaz seems bigger lift is better then bigger duration? Something along the lines of 256/260 with a 9.6 lift etc?

[SiR_RB]

What's the biggest lift possible with non relieved head, standard base circle?

[Piggaz]

What would you recommend for my setup?

According to piggaz seems bigger lift is better then bigger duration? Something along the lines of 256/260 with a 9.6 lift etc?

9.6 mm won't fit in your head though.

[XKLABA]

What would you recommend for my setup?

According to piggaz seems bigger lift is better then bigger duration? Something along the lines of 256/260 with a 9.6 lift etc?

depends on funds and how far you want to go, I like Pauls cams but that is a fair chunk of cash

the type Rs would be a good start and relatively cheap, 9.3mm lift is about as far as the stock springs will stand and IIRC about 9.5mm for head clearance on older heads with stock 32mm base circle which is why most high lift cams now have a 30mm base circle allowing 11.5mm lift just have to reshim ( which is a good idea with any cam change )

[Piggaz]

Sponge bob 2's are coming Mick

[SiR_RB]

will go new springs when the time comes and definetly clearance check/new shims too, so smaller base circle would be a problem..

thanks

[XKLABA]

Sponge bob 2's are coming Mick

I can't wait, hopefully I'll get the first set

will go new springs when the time comes and definetly clearance check/new shims too, so smaller base circle would be a problem..

thanks

the smaller base circle fixes the clearance problem, by reducing the base circle by 2mm and shimming the bucket up 2mm means the point of the cam can be the same diameter from center of cam as stock but pushes the bucket down the extra 2mm to end up at the same height as stock but having the shim 2mm thinker means the valve is 2mm further down, hope this makes sense, i'm all sorts of cut ATM

[SiR_RB]

oops I ment *smaller base circle wouldn't be a problem, in my post before

totally understand cheers

[hypergear]

Some of yous have already seen my result. It is still reasonable to keep this thread updated with latest reslults obtained from a Rb25det. Plus I think this is also the most responsive 407rwkws any 2.5L Rb25det ever got on stock cams and factory cam gears. Details:

93 model R33 GTST Forged CP pistons, valve springs and stock every thing else.

800cc injectors

600x300x75mm Front mounted cool

Brae high mount exhaust manifold

HPVA 50mm external gate plumbed back.

Xforce 3inch Cat back exhaust

100 Cell Cat

Profect B electric boost controller

4inch intake pipe

Adaptronic Plugin

Power so far is 407rwkws @ 24psi E85 Fuel

HyperGear ATR43SS3 CBB VNT Turbocharger.

Turbocharger reached peek power of 407rwkws on 24psi of boost

This turbocharger had big turbo's top end while retains small turbocharger's down low. I've overlaid my result against result from a high flowed stock R33 21U turbocharger.

[raZ1911]

^^ you should give it at go with some cams and see what it can make

[B-rice]

is it out off puff though or is thee more in it.

[hypergear]

There are bit more in it. When it maxes out the upper rev power and torque merges together per additional psi of boost. This one is still increasing both power and torque evenly per additional boost added. We didn't bother squeezing maximum power out of it as the project goal was 400rwkws and this car needs cams.

[mattie4270]

So 260 9.15 cams should get close to 500Kws?

[hypergear]

So 260 9.15 cams should get close to 500Kws?

I'm installing a set of Tomei 264 / 8.5mm cams. I don't think I can reach 500rwkws, maybe 450rwkws.