Are Cams A Worthy Investment On A Rb20?

[RB GUN]

fr0st -- i left the cam gears at the original dials and the full boost reduced by approx 300 rpms.

[Roy]

9.5mm cams for an RB25 in an RB20?????

[legend01]

I'mm gonna break that 11.9999 second barrier when this motor is finished even if i gotta go nos

[Roy]

It was going to be this Friday night but it will most likely be toward the end of the month. Im goign to have a run on some old RR55s and see if i can get the 60ft time down to 1.9. Hope to get under 12.5

[legend01]

wanna borrow my MT radials that'll help

[Roy]

So since this thread is dead...can we take it in a slightly different direction. Copy, complete and paste the following info into your post

Cam Brand -

Specs - (I:Duration/lift , E:Duration/lift)

Turbo -

ECU -

Before, Power - @ psi

After, Power - @ psi

Dyno sheet

It seems so far a few ppl seem to have tried Poncams and HKS Step 1. I shoudl have some results up in a few weeks.

[dead32]

im going reground rb26 cams, comes in at just under half the price of tomai cams... when its all said and done ill post up specs. p.s is that 11.999 on street tyres? or it doesnt matter?

[donkey_punch]

Cam Brand - Tomei Poncams

Specs - (I:256/8.5 , E:256/8.5)

Turbo - gt2876r .64 housing

ECU - haltech e11v2

Before, Power - ? @ psi - didnt get a power reading before doing all the work to the engine

After, Power - [email protected] psi

Dyno sheet - dont have a scanner

[Wheezy]

quincy777- mate ill tell you this. i have had an RB20DET in my GTRST b4 and the mods i had was:

Custom Zorst Manifold

GT3040R with .63 housing

Sard 550cc

EMS stinger

bosch 910 fuel pump

forrged pistons (Arias)

Custom FMIC

Now, i was running 1.5 bar of boost and she made 230rwkw. I ordered Tomei 256 with 9.5 lift cams that was for an RB25DET engine and my mechanic fitted them. then car was tuned at 1.2 bar boost and made a 261rwkw.

The point is that i invested $1500 that was NOT a waste.

Cheers

Babak

230rwkw on 1.5bar wtf that sounds like a fair average figure for that setup...

[Roy]

Cam Brand - Tomei Poncams

Specs - (I:256/8.5 , E:256/8.5)

Turbo - gt2876r .64 housing

ECU - haltech e11v2

Before, Power - ? @ psi - didnt get a power reading before doing all the work to the engine

After, Power - [email protected] psi

Dyno sheet - dont have a scanner

Who tuned the car? Have they any experience with cars with the same setup as you less the cams?

I have searched high and low and im not able to find a single definitive example where a setup had been run for a period of time, then had cams thrown at it and tuned by the same guy on the same dyno and actually made more power.

LOL...it doesnt appear as though such an example exists

[BHDave]

Who tuned the car? Have they any experience with cars with the same setup as you less the cams?

I have searched high and low and im not able to find a single definitive example where a setup had been run for a period of time, then had cams thrown at it and tuned by the same guy on the same dyno and actually made more power.

LOL...it doesnt appear as though such an example exists

If you were after an rb25 example i meet all those criteria. 30rwkw gain with no other changes.

[Roy]

Yeh there is plenty of info around for the bigger RBs...but nothing for the RB20. My attempt looks to be an utter disaster, but need to give it more time and tweaking. But is definitely not a bolt in upgrade

[donkey_punch]

Who tuned the car? Have they any experience with cars with the same setup as you less the cams?

I have searched high and low and im not able to find a single definitive example where a setup had been run for a period of time, then had cams thrown at it and tuned by the same guy on the same dyno and actually made more power.

LOL...it doesnt appear as though such an example exists

it was tuned by richard at allstar performance systems here in qld, your best bet would be to email dan from elite racing at [email protected] and ask him about his personal rb20, i know he did see results from changing to poncams.

[boostn32]

I have Cams in my RB20, with GT3040, 25psi, boost came on hard and all the way to 8.7k, made close to 290rwkw untill it received some forged piston melting conditions. lol.

a better tune and more fuel with new engine should see it hit over 300rwkw.

i know this is all about cams but im not for giving out my specs, but yes they sure make it alot better. more power and response and yes the cam gears were adjusted.

Edited March 14, 2007 by boostn32

[yogi000]

Who tuned the car? Have they any experience with cars with the same setup as you less the cams?

I have searched high and low and im not able to find a single definitive example where a setup had been run for a period of time, then had cams thrown at it and tuned by the same guy on the same dyno and actually made more power.

LOL...it doesnt appear as though such an example exists

have some faith troy.....my car is in the shed with its cams out, ready for the new ones (256/8.5)....just waitin on the water pump, belts, tensioners

should be fairly soonish

[Roy]

i know this is all about cams but im not for giving out my specs, but yes they sure make it alot better. more power and response and yes the cam gears were adjusted.

LOL...fair enough. But there is enough 'trust me..wink, wink" stuff going on. Im looking for hard tangible results

Can you at least post a dyno sheet?

have some faith troy.....my car is in the shed with its cams out, ready for the new ones (256/8.5)....just waitin on the water pump, belts, tensioners

Look forward to seeing your results as your turbo is a bit smaller then what im running.

[silver gts-t]

sif need cams.. more boost and a better tune

i was think cams are bad for bottom end

Edited March 14, 2007 by silver gts-t

[Roy]

Honestly. Based on my experiences with my setup...i agree. Its all in the tune and being willing to run the 18psi with a decent turbo.

What are std Rb20 cams and std RB26 cams. Sure the lift is a little different but the durations isnt overly different. So perhaps the std Rb20 cams are decent enough. I know my power whilst trailing off up top didnt exactly fall over

[silver gts-t]

Honestly. Based on my experiences with my setup...i agree. Its all in the tune and being willing to run the 18psi with a decent turbo.

What are std Rb20 cams and std RB26 cams. Sure the lift is a little different but the durations isnt overly different. So perhaps the std Rb20 cams are decent enough. I know my power whilst trailing off up top didnt exactly fall over

so true, if anything the rev limit needed to be raised

would obviously differ between setups, but goes to show its possible

anyway, graphs have been pissing me off as of late, going to WSID on the 25th.

Edited March 14, 2007 by silver gts-t

[yogi000]

lets hope this whole cam job isnt a waste of time.......