Before I start, my car is FI and I'm running 15.5psi on greddy twins ...

So, I'm in the process of fine tuning my umm tune, WOT is super (although I still need to tweak the tempurature compensation numbers) but under 25% throttle (closed->open transition point) about 3250 there is a slight stutter that I'm trying to get rid of.

So, my question is, what should the timing of the 10% column look like, in previous logging runs I noticed that going from the 0% column -> 10% column there was a 20 degree jump in timing, I've changed the timing map to reduce this gap and it does seem to be better, but then again it could be my imagination ...

Also, I get the whole notion that under WOT the timing should be something like 11 btdc at peak tq blending to 15 btdc at peak rpm for example. But what about the timing before peak tq, should it blend from a higher number down to 11 or should it be 11 all the way up to peak tq ... ?!?!?!

Help would be appreciated,

Colin

 

First are you running a utec? 2nd I hope you get your answer. From what I've seen in a few threads most people tell you get it tuned by a pro. The best that you will get is a base map. I hope you have better luck in getting answers. No one wants to give out the info when they pay $500-$1000 for a tune. Which I can understand maybe you'll find someone good luck.

 

Sorry, yes, utec.

Yeah, I know I'm gonna get a bunch of 'go get a tune' answers but what is the point of that, what would I learn. So, if I get answers, then great, if not, well, we'll see ....

Colin

 

Hey Colin,

For a smooth transition you want to have the timing (stock vs. UTEC) numbers very close to each other. Do a datalog during this transition and you can see what the factory vs. UTEC timing is. If necessary, lower your switch over point to avoid knocking.

Hope this helps,

 

well u can also change the transition time length so UTEC does the above mentioned action itself for you

 

This is what I figured and I've been slowly but surely closing the gap in the ECU timing values between 0% and 10% columns ...

In regards to the closed -> open loop delay, does this actually work well or is it just best to get the timing nailed in the timing map ?

Colin

 

(stock vs. UTEC) numbers very close to each other. Do a datalog during this transition and you can see what the factory vs. UTEC timing is.

can u clear this for me plz ???
do u mean i can see the stock timing numbers ??? plz clear this for me so i can tune the timing perfectly

thanks

 

personally, I played with both. I think it is better to get the timing number as close as you can. The hard part comes when the ECU changes its timing around, though.