New tuners, don't do this...
Thread Starter
TECH Fanatic
iTrader: (6)
Joined: Jan 2002
Posts: 1,193
Likes: 0
From: Springfield, IL
New tuners, don't do this... 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.
Yes, that is stupid fat. Stupider and fatter than stock,
even. Maybe somebody done multiplied when they shoulda
divided. Or believed a miscalibrated wideband.
even. Maybe somebody done multiplied when they shoulda
divided. Or believed a miscalibrated wideband.
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.
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.
This coming from someone that has been "tuning" for about 5 years and still only tunes my own stuff.
Last edited by Atomic; Apr 8, 2012 at 10:34 PM.
Trending Topics
Thread Starter
TECH Fanatic
iTrader: (6)
Joined: Jan 2002
Posts: 1,193
Likes: 0
From: Springfield, IL
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.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo 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.
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.
There are many ways to tune, but alot of them will get you nowhere near the desired end result.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
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.
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.
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.
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.
If you have something you would like to add to the discussion of PE entry conditions I would like to hear it.
