Ext Cam Gear & Tuning - before, after, no difference ??

[Gizmo73]

Hey Guys..

As part of my upgrade plan, ive got two more steps to go...

1) Up boost to 12psi, install power fc and tune

2) install Ext Cam Gear

Now - in regards to step (2), i understand that this is a mechanical retard.

My question is (sorry if its dumb) - is there any advantage to do this together/prior to the power fc tune for maximum gains....or does it matter nothing since the retard is mechanical ??

[Burto]

Not sure if I can be much help but i put in some cam gears with power fc and got it tuned at the same time, went from zero boost at 4000rpm to coming on boost at about 2400rpm and pretty much 1bar at the 4000-4500rpm mark, that was with N1 turbos

[darrinspencer]

I know where there is a good for sale

http://www.skylinesaustralia.com/forums/sh...ead.php?t=57007

[NismoGirl]

I got the exhaust cam gear put on and it didn't seem to make any difference IMO.

[ferni]

I think its different for GTR's.

Makes a big difference for GTR, i've heard people say it doesn't make much different on Gtsts...

[Guest RedLineGTR]

on gtst's (r33) there should be some gain's to be made, on gtr's you use both inlet and exhaust cam gears because gtr's dont have VCT.

With tuning i would get the cam gears installed before the tune. IMO

[2rismo]

There is no difference if all you're doing is replacing your factory gear with an adjustable one

I have heard plenty of people with 33 gtst's getting good results by retarding the exh gear a couple of degrees. As with any modification, you are ALWAYS better to perform the change AND THEN tune for it afterwards.

Adrian

[INASNT]

On mine with i think 4 degrees retarted it made a bit of mid range power/torque gains.

[rev210]

The retarding of the cam gear will do a couple of things.

First your peak power may be a a little lower, this is why people complain about no gains they are looking at the peak power dyno reading. However the boost comes on a tad sooner and the power across the boost range bar the very top end is up usually 10hp or so.

Bottom line is you will have a quicker car at the end of the tune. The guy without the cam gear might beat you in a dyno comp but, you kick his ass everywhere else that actually matters.

As mentioned you need to retune the car and focus on the mid range power timing and fuel maps.

[Gizmo73]

Hi Guys...

2rismo - what you have stated makes sense - however, i wasnt sure if there was any difference between mechanical retard and overall tuning capabilities..

rev210 - the exact reason why i got them...i really dont care about the end dyno figure, just hoping for a good torque (re: 1/4 mile) result...

So - what im hearing is that it seems better to install the cam gear before the overall tune..

Thanks for the replies guys...seems like ill have to wait a while longer before i do the power fc tune... (re: ill do the cam gear install first)

[adznight]

Have been told that on R33 GTS-t there is a little gain to be made, but on a R34 GT-t they are useless (as proven by us). Just some usefull info