Rb20 Cam Gear Settings

[DFAULT]

Hey

just wondering if people can post up their settings of an RB20 with cam gears

or have any suggestions

My mods:

rb20det

- R33 turbo

- 3 inch full exhaust (split dump)

- FMIC (600x300x75) no name

- Hks pod

- Bosch 040

- EBC

- Cam Gears (in/ex)

stock injectors/afm etc

please dont tell me to take it to a shop to get it tune

Cheers

Thanks for your time

[HRthirtyone]

if your gonna give it ago, dont adjust them more than 3degrees at a time. Remember to check how many increments you are actually adjusting. Most of the time they will have on there e.g. one increment is 2degrees or something. Once you adjust the exhaust cam gear, you will have to redo your base ignition timing.

Most people advance inlet and retard ex. from memory..... my car was diff. tho.

[WazR32GTSt]

why can't we say take it to a shop to get it tuned?

each car is different, and yours might make less power than the next car with the same settings

but saying that, your setup is very similar to mine. see the link below. my gears are set at

in: +3

ex: -5

link: http://www.skylinesaustralia.com/forums/in...=115398&hl=

[DFAULT]

Cool thanks

Anyone else?

[BezerkR32]

I agree totally, these adjustments should be done on a dyno see you can see the result of your adjustment.

your car is different to the next and will require different settings.

why can't we say take it to a shop to get it tuned?

each car is different, and yours might make less power than the next car with the same settings

but saying that, your setup is very similar to mine. see the link below. my gears are set at

in: +3

ex: -5

link: http://www.skylinesaustralia.com/forums/in...=115398&hl=

[DFAULT]

Any more settings?

[WazR32GTSt]

have you adjusted them yet?

[DFAULT]

nope

looking for a few settings to try

friend has a dyno so yeah

[DFAULT]

throw some settings at me

[lowrelnz]

c rank 40 deg

ex 12 pack deg

in 2 joint deg

[Kranker]

if your friend has a dyno should be able to find your own settings,

these aren't magic numbers, people play with them on the dyno and see what works

you should do the same

you dont dial in the cams and have a run, then think, ok that diddnt work, ill try another completely different one.

You start at ur current timing, adjust a degree or two, then have a run, then adjust and run etc. Ull find the point where it makes the best power.

only reason why you would want some timing settings that have worked on other cars would be if you didnt have access to a dyno

hope the tuning goes well,

post up a dyno result when ur done, before and after would be nice

[rev210]

Basically, you ought to have proper facilities to do the measurements needed to justify any adjustments hence people telling you to take it to a shop.

No one who has any experience is going to say different, there isn't the kind of consensus about RB20 cam timing settings as per the RB26 with stock turbos and cams. Timing adjustments are dependent on a range of factors.

You ideally need to retune the fuel and timing to optimise adjustments.

I notice you have no aftermarket ecu?

If this is the case then you need to be careful with adjustments and basically a wideband sensor is very good idea.

So you understand 'why' you are moving the cam timing. You should do a little research but, failing that here is my intitial 2c to get you started.

* Advancing the intake cam moves the valve closer to the piston (be careful- not too far) and as a result you get increased cranking compression. You aim to end up with better bottom end power. The peak magnitude of power changes is centred around really the peak of the hill (one spot) but, kind of moves the whole hill under it. You advance and generally the power peak moves down the rpm range, to a point. I think you find due to the relation to cranking compression , things like turbos airflow/boost/ engine breathing characteristics make it slightly more tricky and effect which way you go from 0 -or+ and how far.

* Retarding the exhaust cam moves the valve closer to the piston (be careful not too far) it tends to effect power more generally over the entire curve. But to less magnitude than the intake changes do. The exhaust cam setting is more of a engine specific/characteritics thing. Sometimes advanced sometimes retard.

* Tune at an initial boost a little lower than you want to end up at. Tune for increased boost later.

* Dial in and advance/ retard intake cam first , then the exhaust cam.

Edited September 27, 2008 by rev210