4 second delay for full power?
Registered User
Joined: Nov 1998
Posts: 3,252
From: Knoxville, TN
Bob
Registered User
Joined: Jun 1999
Posts: 2,368
From: OR
the 01 f4i do have a 2second delay in the throttle response on them through the whole rpm range and all throttle positions not just when the throttle is pinned. it was corrected for 02 being it was the first fuel injected F series bikes Honda made a simple change in the computer fixes the problem but i don’t notice the 2 second delay so I have never fixed it.
if it was in the camaro i would agree i would be mad. but we are talking about a truck and in an ss model i could see your point. i have driven an 06 z71 off road and didn’t need to floor it to get it to go although i wasn’t towing. i believe if i read correctly though this 4 second delay doesn’t happen when in tow. i think people on here are a bunch of speed freaks and pin the accelerator on there camaro all the time and feel that people will do this in there trucks as well. i just don’t see it being as big of a deal as people are making it out to be that’s all.your talking about a 4 second delay when flooring the truck not in any other part of the throttle position. i am willing to bet most people will never notice the difference if you didn’t tell them
if it was in the camaro i would agree i would be mad. but we are talking about a truck and in an ss model i could see your point. i have driven an 06 z71 off road and didn’t need to floor it to get it to go although i wasn’t towing. i believe if i read correctly though this 4 second delay doesn’t happen when in tow. i think people on here are a bunch of speed freaks and pin the accelerator on there camaro all the time and feel that people will do this in there trucks as well. i just don’t see it being as big of a deal as people are making it out to be that’s all.your talking about a 4 second delay when flooring the truck not in any other part of the throttle position. i am willing to bet most people will never notice the difference if you didn’t tell them
I sometimes drive my 04 Av aggresively sometimes, when its time to merge, pass, or power out of a slow turn... the Tq managment and oddly spaced gearing sometimes makes it feel like you caught the drivetrain with its pants down. You only notice it when you drive it hard, but due to the circumstances, the effects are magnified because in that time, you are demanding that performance. That said, I still really like my Av.. I'm just not thrilled about that behavior.
We haven't got confirmation about the tow/haul button's effect yet..
This is why I'm not buying another GM large truck or SUV unless it has a 6 speed, and shifts eagerly and crisply under normal circumstances. The various loyalty coupons and the really nice interior of the new Av's make it tempting.. but I'll wait till they put in the new 6 speeds.
If anything, the delay just looks bad, especially when there's a competitor next door..
Registered User
Joined: Mar 2005
Posts: 3,123
From: Melbourne, Australia
Glad I'm an expert now. But I don't my own tuning.
Anyway....
You are the first, and only person that I have ever heard to claim anything near 25-30% driveline loss. The type of dyno has NOTHING to do with how much power gets from the flywheel to the rear wheels. I'm sure you know that.
The dyno's you use may indeed read significantly lower than a dynojet, or even a load-bearing dyno. But it doesn't alter the driveline power loss.
But giving the benefit of the doubt....perhaps your 30% is a correction from what your "DD" dyno reads, back to flywheel, and isn't really driveline loss at all - more like "driveline plus dyno that read less".
Ok. Irrelevant, but ok.
And glad to hear you only made one (maybe two) mistakes.
Not an LS1, but an LS2 will get close. 360 is still a bit high (unless the numbers are uncorrected, cold air).
I still think you're "fudging."
Yup. I learned about new L98s and L76s. And I had some fun. For that I thank you.
And friend....a couple of us were quite soft on you.
Bob
Anyway....
You are the first, and only person that I have ever heard to claim anything near 25-30% driveline loss. The type of dyno has NOTHING to do with how much power gets from the flywheel to the rear wheels. I'm sure you know that.
The dyno's you use may indeed read significantly lower than a dynojet, or even a load-bearing dyno. But it doesn't alter the driveline power loss.
But giving the benefit of the doubt....perhaps your 30% is a correction from what your "DD" dyno reads, back to flywheel, and isn't really driveline loss at all - more like "driveline plus dyno that read less".
Ok. Irrelevant, but ok.
And glad to hear you only made one (maybe two) mistakes.
Not an LS1, but an LS2 will get close. 360 is still a bit high (unless the numbers are uncorrected, cold air).
I still think you're "fudging."
Yup. I learned about new L98s and L76s. And I had some fun. For that I thank you.
And friend....a couple of us were quite soft on you.
Bob
I agree with some of your points relating to the dyno... but don't forget, I just go by the standards we have here when quoting figures. I'm not known to fudge figures simply to win an argument. I will be the first to say "sorry, I'm wrong" if that were to be the case.
The tuning tools are so good these days and the online support is terrific. GM V8s are a tuners dream... and that was the point of my original post in this thread!
Registered User
Joined: Aug 2001
Posts: 2,400
From: Michigan's left coast
I'm not yet convinced that this PCM "artifact" has anything to do with emissions; instead, I'm of the opinion that it has to do with saving the trans when the vehicle is operated within a typical driving profile.
Thread Starter
Registered User
Joined: Jul 2001
Posts: 3,132
From: Santa Clara, CA
Registered User
Joined: Mar 2005
Posts: 3,123
From: Melbourne, Australia
Flashing a light-truck PCM with more-aggressive code and then using the vehicle for its intended purpose is likely to cause damage. The question is what would fail first; would detonation hurt the motor, or would the transmission give up?
I'm not yet convinced that this PCM "artifact" has anything to do with emissions; instead, I'm of the opinion that it has to do with saving the trans when the vehicle is operated within a typical driving profile.
I'm not yet convinced that this PCM "artifact" has anything to do with emissions; instead, I'm of the opinion that it has to do with saving the trans when the vehicle is operated within a typical driving profile.
I'm not sure that its all that aggressive as a stock factory tune... but it's easy to analyze and compare the respective tunes and see where they differ. The constraints could then be removed from the Silverado's tune.
I do take your point that blind flashing a binary into your vehicle's PCM is not the best approach!
Thread
Thread Starter
Forum
Replies
Last Post
F'n1996Z28SS
Cars For Sale
8
Aug 23, 2023 11:19 PM
PFYC
Supporting Vendor Group Purchases and Sales
0
Jan 23, 2015 01:13 PM
PFYC
Supporting Vendor Group Purchases and Sales
0
Dec 1, 2014 08:08 AM
