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Whats a good base for tuning cams?
Posted: Mon Feb 12, 2007 9:19 am
by Sheck
Hey guys, my cam gears should be comming in this arvo so the will be going in as soon as i get my hands on them.
Has anyone got any tips on tuning them? I was told by a trusted mechanic that retarding the exhaust cam is the way to go - said the car will haul arse with that.
I modded a spare cam cover yesterday, so i'm all set for the install. Just need some tips, so any help is greatly appreciated!
Dave
Posted: Mon Feb 12, 2007 12:56 pm
by Babalouie
What's the rest of your setup?
Posted: Mon Feb 12, 2007 2:20 pm
by Sheck
330cc injectors, RX7 AFM, Emanage, 2.5inch exhaust, GReddy turbo kit, IC, HKS 264deg cams in/ex with about 9mm lift on both.
The cams came off a 1.6 motor that was bored out to 1.7 had a GTiR turbo and a bunch of other stuff making 359ps at i think 20-25psi
Dave
Posted: Mon Feb 12, 2007 3:42 pm
by Babalouie
Ahh turbo. Well I can't help you then, I have NFi about turbo
Posted: Mon Feb 12, 2007 3:43 pm
by Sheck
heheh cool thanks, well just out of interest how did you tune your n/a cams?
Cheers!
Dave
Re:
Posted: Mon Feb 12, 2007 4:16 pm
by Babalouie
Sheck wrote:heheh cool thanks, well just out of interest how did you tune your n/a cams?
Cheers!
Dave
I used the timing which Tomei recommended....which was the stock timing!
Posted: Mon Feb 12, 2007 5:00 pm
by Sheck
ahh no worries then!!
thanks
Dave
Posted: Mon Feb 12, 2007 5:33 pm
by Astroboysoup
tried asking some of the US guys???
alot of them have turbs and cams
Posted: Mon Feb 12, 2007 5:38 pm
by Sheck
Yea cheers, i'll do that if the cam gears dont come in today. If they do i'll just try retarding the exhaust like my mech said, and go from there.
Dave
Posted: Mon Feb 12, 2007 6:24 pm
by Sean
Best thing is to get it on a dyno and start with zero, retard a little, advance a little and eventually you will find the sweet spot.
I've seen cams produce peak torque 16 degrees away from where they produce peak power, so be sure you know what you want before turning too much to the advice of others.
Posted: Thu Feb 15, 2007 6:24 pm
by Sheck
Yea thanks Sean, I really need to get my beast onto a dyno soon. Actually put some timing into her so i can pull out some power.
I did some road tuning again today, all i did was retard the exhaust cam by 5deg (2 and a half notches) and the power band has moved back to about 4.5k rpm (instead of the previous 5k rpm). I'm just gonna leave it at that untill i can get to a dyno and tune it properly. Oh and the AFR remained the same.
Oh and the boost spike is a bit worse than before but still not that bad i guess.
Dave
PS anyone know a good EManage tuner on the south side of brissy that will let me help him out while tuning?
Re:
Posted: Fri Feb 16, 2007 9:51 am
by neil d
Sheck wrote:PS anyone know a good EManage tuner on the south side of brissy that will let me help him out while tuning?
Simon at McGregor Mechanical tunes my race car but I'm not sure if he can do EManage?
Neil
Posted: Fri Feb 16, 2007 5:03 pm
by Sheck
Thanks, i'll look into that once all my finances are up to scratch!
Dave
PS someone buy my old suspension!!!
Posted: Sat Feb 17, 2007 12:11 am
by Sheck
just gave the car a bit of stick on the way home from the archefield drifts and it feels heaps better than before!!! good old cold air helped it alot!! great midrange push (the boost spike helps with this) then continues to pull well up to the redline (with the lower boost).
Only problem is the boost spikes up to about 14-15psi then comes back down to 12. Used to be a smaller spike. I'll have to chack on all the auctuator lines over the weekend make sure there are no additional leaks (got man boost contorller)
Dave
Posted: Sat Feb 17, 2007 8:47 am
by john!
With the apologies for the off topic post.
Sheck, where abouts at Archerfield was the drifting on at? If I had known that it was on I would have come down and watched. All I could hear from a few k's away was lots of screeching and engines bouncing off the limiter. It sounded like fun.
john