Wanted to open this thread to have some discussion about tuning...
I have had the car dyno tuned a while back...but master fuel trim was set at -14% for some reason...so zero'ing that has thrown out the rest of the figures...anyway...

besides timing which i will be leaving to a dyno one day in the future...mainly on WOT on an NA...what are optimal A/F ratios? I've been told 13.0:1 on an N/A is sweet for WOT. I will be aiming for 12.5's but what are your thoughts on the topic? is there a right and wrong answer here?

mines on about 12.7 at wot from memory, Steve was very happy with it when he did the dyno run... could be a basis to start at

My magna is currently running around 12.9 and seemed to love going even leaner to around 13.1-13.3 (thats when it made a nice amount over 200@wheels) but we decided against going that lean for now, so pulled it back to its current AFR.

Some cars/engines like running leaner than others and some love running more timing than others, its alll a matter of finding out what your engine runs best at.

Mmmm...Interesting.....I'll be aiming for about 12.5 at WOT right now. But wouldnt mind another hour or two on the dyno to fine tune everything....timings only at about 35degree's but feels alot more lively with the cam gears adjusted....I'll choppity a bit of fuel out today see how we go...

On all this talk of lower temp thermostats and whatknot, can anyone shed some light on a general consensus of what temperature is optimal for "warm"? In regards to best power gains vs temp? I currently have my thermo fan come on at 80deg's...

mine's at 80 as well.

What coolant temp is your's set to add fuel to reduce combustion temp?

Also you should post your timing matrix. I'd like to compare and i'll do the same sometime.

atm I only use a coolant enrichment map while it's cold. after its past 60 degree's it's only the air temp correction map which can come into play. so looking at that coolant map it's set up to start adding fuel again around 105deg. but the car hardly surpasses 90 after heatsoak
Timing map as such after a dyno tune with the standard cam gear settings. with the cam gears adjusted and overlap changed i really think there is a lot of gain to be had....just gotta get it dyno'd again lol

Also nothing from 50kpa and below has been tuned.....that's the killer. Luckily at the dragstrip your at 100kpa :D
http://i9.photobucket.com/albums/a52/dodgeviper89/timinggraph.jpg
Also, this is a standard 3000GT DOHC NA timing map for comparison to yours. would really love to have a look at your map..
http://i9.photobucket.com/albums/a52/dodgeviper89/3000timing.jpg

the tempreture is more of a personal thing but comes into the tune with regards to the higher temp being more stable and thus being able to trim fuelling more accurately/ consistantly for better economy and emissions. Lower temps better support more timing and on a whole, a little less fuel on WOT then when running high coolant/cylinder head temps. It doesnt really matter whihc, but choose one and stick to it before and afte the tune.

generally speaking you see 85degree on factory turbo cars and 100degrees on high compression engines. Start low and work your way up, but dont be too worried about the final number as such, make sure the afr's are nice and stable across the whole rev range AND anything under half load should be nice and stoich (for fuel economy sake). To a degree the lower the AFR the more timing you will be able to run, which may make safer power then a higher AFR with less timing. In all honesty i would be suprised with anything lower then 13.0:1 as compression isnt massive and you do have cam overlap, which also alters the way compression on the engine ramps up with rpm. For arguments sake, now that building forged sr20 engines has come down in cost people are experiementing more and making some huge power increases from rather small changes. In the last few years people have moved away from dropping the stock compression down to 7.6:1 to add 2 bar of boost and running 11-11.5:! arfs across the board to now raising compression to 9:1 or more while still running upwards of 2bar of boost with AFR's in the 12 to 12.7:1 range. I know this has little to do with exact parameters of your car

TUFFY, as u know I'm running 13.0:1 AFR. (i too was told this is preferred for NA engines.)

mine sits on around 12.5,12.9 at WOT, the guys that tuned my car said thats the " sweet spot" with these motors , anything below or above that at WOT, is a waste of time he reckons

my fast cars not a n/a magna but the motors comparable, i run 13:1 off boost and 11.8 on boost.

I imagine you want it as close to stoich as possible while avoiding detonation.

http://i931.photobucket.com/albums/ad152/ajwasherein2001/Ajtimingmap3LDOHCV6.jpg

There you go Paul. Too much timing; needs to be wound back a few degrees then the fuel can be corrected

Excellent! Well around 80kpa it's got a massive spike which is not good...
We'll flatten it out and work on fuel I think. maybe add 2 degree's in the top half upper RPM for some more power but yeah work on fuel first.
Excellent :D

Thats TPS yo but yeah unsure if thats just a missed pt

Thats TPS yo but yeah unsure if thats just a missed pt

Ah yep. need to get that MAP in soon eh..
We can smooth that out no worries, good to see you finally got the tune from the car

;1307033']Ah yep. need to get that MAP in soon eh..
We can smooth that out no worries, good to see you finally got the tune from the car

Ive had it on my computer for over a yr lol