Would you trust DLL for tuning MBT? Putting my DSM on a dyno is a chore, and last time it was spinning anyways. My Evo requires a 2.5 hour drive for AWD dyno time.

 

I think if you are good about using DLL and trying to keep as much constant as possible you could.

Also experience helps alot, which I know you have tuning the 4G63. People tell me I am crazy when I say I can actually hear small differences between tuning changes.

Going beyond MBT doesn't always mean you don't gain anymore power either. Paying attention to the curves is key as well. If you gain 8whp but the curves aren't smooth anymore, obviously the motor isn't very happy.

 

I used to tune my 4g63 by ear. Retarded as it was, I was the most reliable/fastest back then. Then I threw a wideband on it and got "scared" so I richened it up. Since the wideband I've never broke as many parts and went as slow. Thanks for the input. I'll trust my insticts. Its just that I know, for a fact, that straight ethanol motors will preignite before detonate, so the tuning style is not det limited. I'll trust my ears and the "feel" of the motor when tuning on E85.

 

Indeed. I just hope more people figure this out and we don't start seeing a bunch of rods on the street from E85 tuning.

It's easy to be too greedy with this fuel.

 

Preignition is cool, in the fact that everything is fine, then next thing you know rods and bits of your crank are on the ground. LOL

 

It may be worth your while to look into an e-cutout. I am running the DMH e-cutout with a QTP downpipe with the stock cat and cat-back. I actually like driving my car again and my old exhaust wasn't even that loud. I had full 3" exhaust with a high flow cat and two resonators and magnaflow muffler.

I do have a problem that I haven't had time to figure out/ tune out yet, though. My car can't take any timing anymore...my knock cel flashes like a B. I know the QTP downpipe flange is hitting the cat heat shield, so it may be that, but I think it very well may be due to the restrictive stock cat/cat-back. I need time to tune and figure it out. I may end up putting my high flow cat back on if it turns out it is the stock cat causing most of the problem.

The car is loud with the cut-out open though. I've only tested it a couple times, but it's loud as hell. Straight through 3" from the DP, though, so you aren't going to get a much better flowing setup for track use while maintaining stock quiet for daily driving road use.


Eric