SMOKINV8

iTrader: (6)

I was called to "fix a tune" for a fella the other day. He told me he had his truck built and tuned at a dyno shop (non-sponsor in northern IL), and had basically reached his wits end with his poor fuel economy. There was a lot mismatched with his combo, but long story short, his fuel economy issue was pretty apparent.

gectek

iTrader: (2)

Do not look at edelbrock canned tune then.

jimmyblue

iTrader: (11)

Yes, that is stupid fat. Stupider and fatter than stock,
even. Maybe somebody done multiplied when they shoulda
divided. Or believed a miscalibrated wideband.

gectek

iTrader: (2)

I guess you did not see the 2% throttle in the other table at the top? It was always in PE. Not the best idea....ever really.

rmata

iTrader: (34)

Maybe he told them he wanted a race only tune and gets towed up to the starting lane, lol. That's crazy!

redtan

iTrader: (5)

It's not even about that, it's the fact that he was running in PE at 1200rpm at 10.9 AFR.

OP, is that a boosted truck? That would explain the rich PE throughout the higher rpms but not the fact that it was entering PE at 800rpm.

Atomic

iTrader: (37)

90% of the "tuners" out there are complete hackjobs that have no business tuning anything besides their own lawnmower. The majority of the other 10% are very good but usually dont have time to frequent forums as often as the rest of us would like so their knowledge isnt really shared, which keeps them in business.

This coming from someone that has been "tuning" for about 5 years and still only tunes my own stuff.

SMOKINV8

iTrader: (6)

Yes, it's a boosted truck. It's an 8.8cr shortblock (that was fresh when this tune was put in) with a P1. It has other issues besides the mismatched combo. I don't get on here very often anymore because of cycle of noobs that read and regurgitate, but this was about the dumbest thing I've personally seen done in a tune so I had to share. Plus, he took it back multiple times to have it fixed, and supposedly had another shop look at it as well. I'm hoping the rings aren't washed down in it.

gectek

iTrader: (2)

You mean a target PE of 10.5 then to 11.3 right? You can enter PE at 800 RPM and its fine, as long as the tps% indicates it. But running in PE all the time....might as well just toss the O2 sensors out the window.

got-a-ls1

iTrader: (12)

im gonna set my pe enable at 1% so i can be faster

bad6as

iTrader: (17)

Yeah a target a/f of 11.3 is a lil rich. But that pe table needs WORK

gectek

iTrader: (2)

Well in thinking a certain tuners way, if you make sure the PE is plenty rich, then you do not have to worry if the MAF goes out or the intake after the MAF creates a leak, or a charge tube blows off.

There are many ways to tune, but alot of them will get you nowhere near the desired end result.

ctd

iTrader: (1)

I should not even ask this, what is the logic & thought process behind that table?

01ssreda4

iTrader: (96)

The correct way to stop this cycle you speak of is to add correct information to the mix. With all the experienced guys having the opinion you have, all us poor souls that search for correct answers are fucked. So thanks

Exeodus

iTrader: (1)

^^^^ Hit the nail on the head. ^^^^

Atomic

iTrader: (37)

The tuner has the right idea, but he should set the enable map a little higher, at 55kpa the engine isnt under enough stress to need the extra fuel. Delay rpm should also be something slightly below the stall speed of the torque converter. On my setup with a turbo and 3200 stall I have mine set for 20% throttle, 85kpa, and 2500rpm delay and it works perfectly.

The logic behind that table is you dont want throttle position to be a determining factor in when PE is enabled. This isnt as important in supercharged applications, but with a turbo when you can have some conditions that are low throttle, low rpm, and boost, you want pe to enable based on manifold pressure and not rpm. With a procharger boost is directly related to rpm so you dont have to worry about it as much.

The tuner had the right idea, but is way too conserative. Tuners have to play it safe because if someone is ******* their engine and it breaks, they instantly blame the tuner.

edcmat-l1

iTrader: (10)

So there are no tuners that frequent forums that are any good? OK, then being a hack, I guess I'll keep my opinions to myself about your last post, and what is and isn't correct about it. Ironic how someone who only tunes his own stuff is such an expert on tuning and the quality on tuners in general.

SMOKINV8

iTrader: (6)

I know you're not seriously stressing over this Ed.

Atomic

iTrader: (37)

No, thats not what I meant. My original post was a little harsh, I admit, so I reworded it slightly. A lot of the guys on here and other forums are very good at tuning, but many are not. How many horror stories have you heard about someone paying a "tuner" to work on their car and it never really working right or constantly having problems? My post was not intended to assess the skill level of anyone reading it, but merely to bring attention to the fact that a lot of guys that own HPT or EFILive do not have firm grasp of what they are doing. I made no assumption about your skill level nor mine for that matter.

If you have something you would like to add to the discussion of PE entry conditions I would like to hear it.

GregRexAdams

I've seen many tunes like that. They always give me shivers, because I'm afraid of what else I'll find.