R32 GTR Cam Gear settings for max power?

[fsmout]

Hey everyone,

I have had my 32 GTR rebuilt and iv now done 3000kms. I had it on PITS dyno and spun up 250kw at the rears @ 1.2bar. Im running arias pistons 87mil bore, standard cams, 750cc injectors, pfc, ngk ird .8m plugs and N1 turbo's. I have adjustable cam gears but they are at the standard setting.

I dont really want to pay $140 an hour on the dyno up front to experiment with the timing??

Thought i might ask the question as to what other people are running as far as timing and what power levels they are getting vs the standard timing??

i have heard 2 deg's on the exhaust with my setup could improve power through the range??

cheers,

Francisco

[Sydneykid]

Each engine is different. The most common is 2 degrees advanced on the inlet and 4 degrees retarded on the exhaust. It's where I start and I can work through the most likely combinations in under 30 minutes. Some engine need "unlikely" combinations and you can't tell until you try it.

In yor case 250 rwkw at 1.2 bar is not as good a result as I would expect from your parts combination, I suspect that there is plenty to come with more tuning. Around 300 rwkw at 1.4 bar would be my expectation based on past experience.

Please post up the results after you have gone the next tuning step:cheers:

[Blitz]

I was about to say the same.

250rwkw can easily be acheived on standard turbos at 1.2 bar without cam gears and only basic exhaust upgrades

[fsmout]

yeah thats what i thought, anyway i am going to the sau dyno day tomorrow so ill post up the results on a different dyno. I think also a limiting factor in my systme is the exhaust as its only 3 inch & i have a 3 inch cat? i will be putting a 3.5inch system on at the start of June. From there i guess i will be saving to get it re-tuned with the cam gears adjusted.

i was expecting about 280kw+, but was a little surprised with 250. Not sure if it makes a difference but the dyno was done after 900kms and was a tune run not a power run, done in 3rd? Also i was running the second batch of run in mineral oil at the time?

[Sydneykid]

yeah thats what i thought, anyway i am going to the sau dyno day tomorrow so ill post up the results on a different dyno.  I think also a limiting factor in my systme is the exhaust as its only 3 inch & i have a 3 inch cat?  i will be putting a 3.5inch system on at the start of June.  From there i guess i will be saving to get it re-tuned with the cam gears adjusted.

i was expecting about 280kw+, but was a little surprised with 250.  Not sure if it makes a difference but the dyno was done after 900kms and was a tune run not a power run, done in 3rd?  Also i was running the second batch of run in mineral oil at the time?

It depends on how hard you ran it in, 2 sumps of running in oil is more than I use. One oil change (to synthetic), 2 oil filter changes and 500k's to Bathurst and back is it, run in as it is ever going to be. If you pussied it around for 900k's then it was probably not run in yet. So it will pick up some power as it seals better.

I would say it wasn't tuned for power anyway, it should be much better this time, depending on tune of course.

[fsmout]

yeah i pushed it around for 900kms(oil & filter change), then ran it in on the dyno for 3 hrs.

after 2000kms i changed the oil and fliter again to synth 5w50 and i will do it again before sat.

Yeah i dont think it was tuned for power, or at least i HOPE not, lol!!

Thanks guys!

[TurboX]

Each engine is different.  The most common is 2 degrees advanced on the inlet and 4 degrees retarded on the exhaust.  

Fsmout, sorry to hijack,

but I was wondering the same thing about when I fit Int/Exh GTR cams (thanks Ronin09) to my RB20 which has adjustable Custom mod std adj. Gears.

I have read about probs with this mod but I am going to give it a go soon.

I am going to be very careful about binding and try to measure everything first.

[Sydneykid]

Fsmout, sorry to hijack,  

but I was wondering the same thing about when I fit Int/Exh GTR cams (thanks Ronin09) to my RB20 which has adjustable Custom mod std adj. Gears.  

I have read about  probs with this mod but I am going to give it a go soon.

I am going to be very careful about binding and try to measure everything first.

Excellent, someone else trying the RB26 cams in RB20. What ECU?

[TurboX]

Excellent, someone else trying the RB26 cams in RB20.  What ECU?

I have already used Martin Donnon & Morpowa Adelaide to tune the chipped std ECU after the last bout of mods inc custom Intake, and it come up to about 170KW.

As i have done more work and with the GTR cams I was thinking of going to a Piggyback Perfect Power SMT6 & local dyno as its a long way to Adelaide.

My GTS4 is also Auto so easier to piggyback.

[fsmout]

hi,

Dyno'ed at the sau day on sat and spun up 259.2awkw, on 1.2bar. I might have to put it in for another session and get the timing played with. Maybe i should up the boost to about 20psi?

anyway its got enough power for me at the moment!!