I recently installed an Edelbrock e-force SC on my 2007 LS2. I did not opt for the optional fuel pump kit. Power produced on the dyno is 506HP and 460ft lb. Issue I'm having is that on cold start up, the engine revs by itself from 500rpm to as much as 1500rpm for 15-20 sec. I took it back twice for recalibration and this is substantially better. In fact when I first got it the engine actually tried to go to zero rpms and stall and as high as 2500 for over one minute. Once the 15-20 sec goes by, the car seems to run perfect. One more note is that the problem seem worse if the car sits there for a few days than if I run it the night before and then start it in the morning. Is anyone else seeing this sort of issue? Any ideas?

 

Are you using the canned E-Force tune that comes with the hand-held? I tried it and it stalled at every stop sign. I had to have a tuner build a tune from scratch.

Elmer

 

Mine is a custom tune as well. They've tried to adjust it twice. As I said, much better than the first time but I'm pretty picky.

 

What tuning software are you using?

 

I'm checking with the shop to see what SW they used. With your custom tune, did you get it to rune perfectly? Again, mine only does this occassionally and only on start up for 15-20 seconds now. Maybe I'm being too picky?

 

I have three issues with my car right now:

1) Dieseling

Upon shutting off the engine, the car tries to run on for about 1-2 seconds. It only does the dieseling in closed loop after the car is at operating temperature. In open loop, the car shuts down normally. The dieseling happens on the E-Force tune and the custom tune.

2) RPM dives at idle

Sitting, closed loop, the commanded A/F jumps to a number other than 14.7 and the RPMs dive down into the 400s. It recovers on it's own and will then sit and idle normally until it get another wild hair up its *** and performs the same cute trick.

3) Horn goes meep-meep with the Edelbrock mounting and procedure. I need to get that fixed as it's pretty useless to meep-meep like the road runner cartoon.

Edelbrock has no explanation for these two events and we can't seem to tune them out. The Edelbrock tune stalls my car every time I stop. I had to slip it out of gear, left foot brake and work the throttle to keep it running. Great huh? The E-tune also put out 50 less HP than my custom tune. Pig rich and terrible timing.


I've experienced the high revs (well higher than I deem normal) at startup but only for 1 or 2 seconds and it is so rare that I've missed getting the event on my scan-tool software. Since it is very rare, I haven't tried to get it fixed because you don't know if what you do to the tune fixes it until the rare occurrence repeats.


Oh, and NO, you're not being too picky. If it didn't do that before the kit, it shouldn't do that after the kit.

I'm not sure if Edelbrock is too concerned about fixing my car as they have my money and are looking for the next guy, not the quasi satisfied customer.

Elmer

 

I have a 2007 LS2 without an optional fuel pump, and getting similar rwhp numbers to yours.

Not on my car. Mine starts up and idles normally. Moments ago I specifically started it up cold so I could observe the exact behavior, and the idle ends up a 900 RPM for a moment and then drops to 800.

 

I have the lower hp kit with the stock fuel pump on an 06 MN6. No other engine mods except Dewitt radiator. My numbers are very similar to yours.. little over 500 rwhp with 480 torque.

1. No dieseling. It did diesel the VERY first time it was started at ECS, but never saw it again after it was tuned. ECS did not use any part of the Edlebrock tune.....
2. On cold start engine jumps to about 1000 then quickly drops back to 500 and then to steady 850. Stays at 850 until it's off closed loop.
3. RPM is seems pretty steady once car is warmed up.

One complaint I have is the engine doesn't return to idle as quickly as I believe it should. If you're coming to stop light from say 30 or 40 mph and de-clutching it seems to take longer to drop to idle than I would like... It's not anything I can't live with for now but it's certainly not the same as it was stock! Not going to mess with it unless it gets worse.

The other slight annoyance is when going moving in 1st at an idle it wants to slightly surge. Seems like it wants to idle up a bit on it's own.. which you need to be aware of.... Almost like the feel of having a big cam when your engine lopes forward... Again it's not something I'm going to do anything about unless it gets worse.

Sounds like these E-Force setups might be pretty sensitive to idling issues.... Have to wait until there are enough of them out there to really decide just how good the set up is going to perform over the long haul. I have no major issues and the car runs excellent over all.....

 

Craig,

All in the tune....and yours was tuned by the master. I'm sure a 15 minute "touchup" would sort out those little nits.

 

Ken....
Good idea.... I'll probably run it down to Doug in the spring and see what he can do with it. Sort of SCARY how much tuning affects these things now. Without having a really good tuner you have an 85 lb aluminum anchor sitting on top of your engine..

 

...or you learn to tune the car yourself!

 

That terrible thought has already entered my mind....

 

michc6 where are you located?

 

I'm in the north suburbs of Detroit. My issue got a little worse last evening. I started the car cold after work and started to back out without letting it get through its little rev cycle. Got a check engine light and was a little difficult to restart for a minute or so. I plan to take it back to the shop again today.

 

Spend 6-7.5k for charger/stall and it should be perfect...What am I missing here...Thanks for posting

 

So my shop tried contacting Edelbrock for calibration ideas for the start up. Edelbrock's tune expert is on vacation until next week. I think the shop I'm working with is running out of ideas but is willing to keep working on it. Pretty soon the snow will fly in michigan and I will put it up in storage and revisit the problem in the spring. Maybe there will be more insight out there by then. My shop has done three LS3s and say there have been no issues. My LS2 is there first.

 

That's exactly my thought. I will stick with the A&A kit when I supercharge mine in the Spring. The E-Force kit seems to have a few bugs that need to be worked out.

 

Yep, his name is Chris. He's been sending me a "daily tune" to load and is working hard to correct my issues. The car is running very well now except for the dieseling. From key off to 0 RPMs takes 1.7 seconds. If I extrapolate from key off to 0 without the dieseling, the time should be .8 seconds. This has been a bear to find and he's still whacking at it.

We've taken a holiday break to do "Turkey" so he gets a break on the e-mailed tunes.

All other issues have been resolved, well except for the meep-meep horn I have. I just haven't worked up the energy to remove the nose to fix the damn horn. Sigh... Maybe when it gets into the 60s or so, I'll get the energy. Looking at 82 today so it's too hot and then there's the turkey and pie and football and....

Elmer

 

The problem is the mail order tune. You need a proper tune where someone can data log and make changes on the fly. What would take a tuner a couple hours is taking weeks.

 

Thank you for that insight.

We took a stock tune, set the injectors, MAP, & MAF and the car still diesels. That was done with EFILive here in Jax. My car has been obstinate since the day the ECM was turned into a paperweight by the original Edelbrock tune. We used it to get the new MAF slope but it disabled the car and it took a week to get the ECM back to where it thought it could get the car to just run.

This problem might be the tune but Edelbrock needs to fix it. They are working on it. I do not know what is causing the issue so I sit, load the new tunes, and send back data logs of the problem. I hope it is the tune and it gets fixed. If it is the ECM, then I have a totally different issue to discuss with Edelbrock.

Elmer