Modifying fuel maps in order to get more torque on low revs???

[frankxb12r]

Maybe this is an stupid question but I just wondered If I can modifying my fuel maps in terms to get more torque on 2K-4.5K revs to ease the way to do wheelies??

I've actually modified my maps (with megalog and ve analyzer) and I have a bike with minimum backfire and virtually no popping under 1K-3K revs. The acceleration curve is really smooth and linear; That's why I asked if I can "modified" this tune to improve tricks.

Thank you guys and best regards,

Franklin

[jimijeans]

Well if you have modded exhaust,ECM Spy w/ Megalog Viewer/Analizer.Do a data Log run MAKE sure to anchor things properly, and see what your fuel maps need for your type of riding.This way you can see what the engine is doing at the Rpms/2K etc..You may find that a Tiny bit Richer at those 2K-4K- Revs, can benefit and get the pull needed. Make sure to check the lower end Maps as well.I'm GUESSING but I figure you are wanting to pull a Wheelie at Say 3rd, gear and bring up the front wheel? My Bike can do that Only in 1st, or 2nd gear.Post up later.`Jimi:D

[Sirius815]

Doesn't retarding timing increase low end torque (albeit decreasing top end)? Actually now that I think about it, couldn't the timing maps be changed to do that? ...and on that note, wouldn't Megalog try to get the most out of your datalogging?

[gbalias]

you dont get power from fueling.

its all in the ign timing.

sirius, you dont get tq from retarding the timing. the effect of doing that is a loss in overall power, and a dramatic increase in EGT's.

and the ONLY way to properly tune for tq (which is what should always be done anyways)is on a steady state dyno.

[Sirius815]

Hm...so if it's all in the timing, wouldn't retarding timing or even advancing timing be adjusting timing? (No argument, just trying to learn).

[GW 04 XB12R]

I know that for my '88 Mustang, the stock timing is 10 degrees. If I advance the timing to 15 degrees, I need to run higher octane fuel (nothing crazy, maybe 93 octane from 87) to avoid pre-ignition, and it DEFINITELY pulls harder. I've noticed a consisten 0.2 second 1/4 mile time decrease JUST from advancing the timing using 93 octane.

Using this (and only this) case, I would suggest to advance the timing, and run a slightly higher octane fuel. But then, our bikes are already recommended to use higher octane fuel, so maybe the timing is advanced (vs. my Mustang) and advancing it more won't help anything. Idk!!

--Gary

[gbalias]

yes, any change would be 'adjusting' it.

however, i dont recommend doing it on your own without any means of monitoring the effects unless you are VERY familiar with whats going on.

for our bikes, there are places for improvement in the timing maps but each application is different. ive found that (in my particular case) the stock map in many places was much more advanced than 'needed', and retarded in other places where it can be advanced.


running a higher octane allows for a more advanced ignition because of its resistance to detonation (knock). if youre getting any detonation on premium, and all other aspects of the engine are in good working order (plugs, cooling/ET, fueling, etc) the timing in that combination of TP + RPM is too advanced.

however, the old 'method' of "advancing until it knocks, then bring it down a couple degrees" is also a terrible way to do it. plus, messing up here can and will cause catastrophic damage to the engine. ive been over this stuff a hundred times and i think theres a practical example i posted after i did my cert. a while ago