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Thread: 87 octane with DE ecu?

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Posts: 11-20 of 20
2014-03-27 01:19:17
Originally Posted by B15NEOVVL
Personally, I would never do something like this. Running 23* base timing with 87 octane fuel in the warm environment that California brings...seems like a recipe for disaster. Maybe some top dog tuner will chime in with contradictory evidence but until that happens, I say it's a bad idea. In my eyes, what you are thinking about doing, is similar to tuning on the edge. Most tuners will not push the absolute max timing in each cell as you want room for changes in temperature, variations in fuel quality, etc.. You should always leave a margin for error and otherwise. Maybe you can get away with it, even for a short period of time, but if it is at the expense of your pistons (ringlands) and piston rings, is it worth saving a buck or two in gas? Maybe you can have one less cup of coffee a week to make up for the difference?

Also, how are you measuring the "pinging"? At idle? It is usually easiest to hear at idle and while under low load condititions? Now, throw a loud VE into the mix, with (probably) a loud straight-through muffler and I'm betting if there was pinging happening under load, you would NOT be able to hear it. How do your plugs look right now?

If you are going to go ahead with the experiment, humour me and do a compression test now, and then after a month or two of running with the 23*/87 AKI combination.

Good luck either way!

Lol my exhaust is extremely quiet.. It's nearly equivalent to stock with all the bs crush bends and 1.75" flange lol I've had it on the dyno with the hood popped listening for pinging all the way to 26 degrees from the tuners ears and my own as well and nothing. wasn't planning on keeping 23 timing with it lol was going to go to 17 or so lol but i guess i'll just stick with premium and drive my p11

Originally Posted by BlueRB240
He needs to save that 2.48 on every fill up. I'm assuming he wasn't going to try and race people with 87 pump gas on a some what high compression motor. I'm sure he knows the sound of pinging too..... or I hope he knows what it sounds like before he kills his motor lol.

LOL well I do a lot of long distance freeway driving so I'm just staying at 3k, wasn't planning on racing anybody running it but just for bullshitting around town without hitting VVL.
2014-03-27 05:37:37
get a ecu and drop the afc and tune your cruise map for better mpg. It's hard not to go wot but that's just me.
2014-03-27 06:53:30
Originally Posted by BlueRB240
get a ecu and drop the afc and tune your cruise map for better mpg. It's hard not to go wot but that's just me.

Lol it is hard as hell for me too.. I don't think I've ever driven my car and not hit VVL other than moving my car a few feet lol but to save gas I probably would... I just really don't see myself forking out a good 5-600 for an ecu lol Damn I wish it was cheaper..
2014-03-27 07:08:11
87 pump gas it is then.
2014-03-27 07:46:12
Originally Posted by BlueRB240
87 pump gas it is then.

nah i'll stick with the 91 and just drive my p11 more lol they both get 24 mpgs but regular vs premium... Would this be a good ecu to get?
2014-03-27 08:57:14
How do you get such mad mpg in the g20? Are going wot from every dead stop?. That ecu might work with your p11 since it's odb2.
2014-03-27 09:24:20
Originally Posted by BlueRB240
How do you get such mad mpg in the g20? Are going wot from every dead stop?. That ecu might work with your p11 since it's odb2.

my b14 is the only one I care about lol but nah not completely WOT all the time but you will rarely catch me going 65 on the highway lol original factory numbers were 26 combined.. I haven't measured how much mpg's I get now though after I just fixed my intake hose though, sure that thing was robbing plenty of mpg's lol (almost torn in half in a few places..) That and it is a g20T so fully loaded with a bunch of crap
2014-03-27 09:33:26
My bad thought you had a B13, That ecu will work with your B14. Your going to have to learn how to use it tho lol. Time to go back to the old forum and start reading.
2014-03-28 17:22:08
You can try it. ECU should pull timing back to dial out the knock if everything is stock and plugged in. You might end up doing more harm then good since the reduced efficiency of the overly retarded timing could decrease your MPG and offset the cost savings. Not always the case but can happen.

And btw just because you are cruising at lower RPM does not make you less prone to knock. Actually the higher the RPM the less tendency for knock to occur. But I digress.....

I drove my VE around for almost 2 years and in the summers it would knock at lower RPM. I thought it was a loose bolt. One day it popped in my head that it was knock so I adjusted me ignition maps and it has not since...

Also, knock can occur slightly where it is undetectable to the human ear. It is just my opinion but this probably will not cause damage especially if my engine took it for such a long period of time. It also just put down over 200whp a month ago despite all of this so that is cool I guess. N/A engines are VERY forgiving. I got lucky. I would not encourage running with a disabled knock sensor.

Enjoy and be safe.

2014-03-29 17:51:54
I tuned mine to run on 87, runs great. If you don't have a ton of mods on it/aren't bigger displacement you're going to be fine. Might even make more power than if you were to run it on higher octanes. These engines are bulletproof
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