Tune Help

Lightning and Harley Davidson F150, powered by a supercharged 5.4L 2 valve engine
Post Reply
Ascendancy
Private
Private
Posts: 9
Joined: Mon Sep 03, 2007 6:09 pm
Location: Guntersville, AL
Contact:

Tune Help

Post by Ascendancy » Wed Sep 12, 2007 1:08 pm

So I'm finally getting a chance to begin tweaking my tune, and I have a few questions. On my base tune everything is fine except my air/fuel because at WOT it will read anywhere from 10.5 to 10.8. So would I use the spark modifier or fuel modifier to lean it out farther? Also would it be better to adjust these by RPM or globally? And what exactly is global fuel modifier PT and FT. I'm sorry if these sound stupid, but this is all new to me.

Rhynotune
Sergeant Major of the Army
Sergeant Major of the Army
Posts: 110
Joined: Mon Jul 23, 2007 1:31 pm

Re: Tune Help

Post by Rhynotune » Wed Sep 12, 2007 1:21 pm

I wouldn't lean it globably. Use the mid and high RPM fuel modifiers to address that.

Globally means everywhere, from idle to redline.

Generally speaking, spark doesn't lean the mixture, the same amount of fuel is going into the motor but the increased spark in some cases burns off the additional fuel. Never add spark to lean the mixture, it rarely works that way.

Ryan
Ryan
RHYNOTUNE
rhynotune@gmail.com
Sniper Delta Force Tuner and Dealer

AIM: RyanatSDM

Ascendancy
Private
Private
Posts: 9
Joined: Mon Sep 03, 2007 6:09 pm
Location: Guntersville, AL
Contact:

Re: Tune Help

Post by Ascendancy » Wed Sep 12, 2007 2:46 pm

I'm also getting a stutter I guess you could call it. It only does it on the 1-2 shift at WOT, but it's bad enough the truck will basically fall on its face. Once it shifts out it's fine though and 1-2 is the only time it does it. Any ideas on this?

Mattr66
Warrant Officer 5
Warrant Officer 5
Posts: 292
Joined: Fri Jul 20, 2007 4:58 pm
Location: College Station, TX

Re: Tune Help

Post by Mattr66 » Wed Sep 12, 2007 2:59 pm

could it be bumping the rev limiter on the 1-2 shift?

Matt R
Matt Robinson
Delta Force Gas and Diesel Tuner
www.gearheadautomotiveperformance.com

Ascendancy
Private
Private
Posts: 9
Joined: Mon Sep 03, 2007 6:09 pm
Location: Guntersville, AL
Contact:

Re: Tune Help

Post by Ascendancy » Wed Sep 12, 2007 3:08 pm

It's possible, but I actually backed my gears off. I went from 4.10 back to 3.55, and I never did it with the 4.10. How would I go about backing down my shift point? I don't have the software with me right now so I can't remember all the options.

Mattr66
Warrant Officer 5
Warrant Officer 5
Posts: 292
Joined: Fri Jul 20, 2007 4:58 pm
Location: College Station, TX

Re: Tune Help

Post by Mattr66 » Wed Sep 12, 2007 3:45 pm

you could raise the rev limiter in your software or your WOT shift point for that gear down by 100RPMs or so. Just watch your tach and see if you can get an idea what is going on. Sometimes the shift points get overshot when you start adding power and it just bumps the rev limiter on the 1-2 shift.

Matt R
Matt Robinson
Delta Force Gas and Diesel Tuner
www.gearheadautomotiveperformance.com

Ascendancy
Private
Private
Posts: 9
Joined: Mon Sep 03, 2007 6:09 pm
Location: Guntersville, AL
Contact:

Re: Tune Help

Post by Ascendancy » Wed Sep 12, 2007 3:53 pm

Alright I'll give that a try, and thanks for all the help.

sniperpat469
General of the Army
General of the Army
Posts: 427
Joined: Fri Jul 20, 2007 2:53 pm

Re: Tune Help

Post by sniperpat469 » Wed Sep 12, 2007 4:53 pm

For adjusting the air fule use the mid and high adjustment like Ryno said,.


The studdering may me the spark plugs check them , at what boost dose it happen also what is the AFR when it happens it may be running a little rich


Patrick
Image

Ascendancy
Private
Private
Posts: 9
Joined: Mon Sep 03, 2007 6:09 pm
Location: Guntersville, AL
Contact:

Re: Tune Help

Post by Ascendancy » Mon Sep 17, 2007 3:31 pm

My plugs were just put in maybe 200 miles ago, and they're TR6's gapped at .35. I never got a good look at my boost gauge because I was so focused on the wideband. I was WOT and my AFR was right around 10.8, so maybe around 12 to 13lbs of boost. Now with a little tweaking I got it up 11.3 to 11.5 range, but I still get the stutter. I adjusted the rev limiter as stated earlier, but it's still there.

sniperpat469
General of the Army
General of the Army
Posts: 427
Joined: Fri Jul 20, 2007 2:53 pm

Re: Tune Help

Post by sniperpat469 » Mon Sep 17, 2007 5:14 pm

You do need to lean it for sure, that is probally causing the popping.

11.6-11.8 is a good AFR for that.

Patrick
Image

Ascendancy
Private
Private
Posts: 9
Joined: Mon Sep 03, 2007 6:09 pm
Location: Guntersville, AL
Contact:

Re: Tune Help

Post by Ascendancy » Mon Sep 17, 2007 5:17 pm

Alright I'll give it a try when I get off work tonight. Thanks again for all the help.

Post Reply

Return to “SVT Lighting and SVT Harley”