Free Horsepower ?!!? - Topic Powered by Eve Community

Quadrasteer Junkie

Posted

I haven't tried this myself, yet, but you know I will

It comes from the highest source

On our LSx motors, changing the spark plug gap from .065" (factory spec, or is it .060

) to .045" is worth up to 10hp

In fact, he went on to say that he has never had an engine make more power with a bigger gap- he recommends .040~.045 for ALL engines !!

At first I figured he'd mean crank hp... but he only has a chassis dyno (to my knowledge), so... 10rwhp ??

The source is good... but I'm still skeptical

It's certainly worth a few minutes of your time...

I'll report my findings but if anybody else beats me to it, let us know

______________________________________________________________________
MrQuadrasteer
QuadrasteerClub.com

2003 Chevy 1500HD CrewCab 2wd Quadrasteer
6.0l, 4L80E, 3.73
Wester's 91/93 tune, aFe cai, 186* stat, t/body bypass, E-Load Revos
302rwhp

Posts: 1014 | Location: Houston, Texas | Registered: February 06, 2005

Quadrafacts

Posted

Would reducing the gap without changing the ignition module programming cause the spark to jump the gap earlier?

Would this be like advancing the timing?

Would this cause predetonation or spark knock?

Would higher octane fuel be required?

Would emissions systems be thrown off, causing the computer to try and compsenate?

Enquiring minds want to know.

I just changed plugs to a 300,000 mile Honda where the rounded and worn electrode gap was well over .095" (the highest my gap guage could measure). The specification called for .043" I'll now have to ask the regular driver if any significant pickup in power was noticed.

___________________

Posts: 162 | Location: United States | Registered: May 26, 2005

Ignored post by Quadrafacts posted

BlackDawg

Posted

quote:
I'll report my findings...

Mr Q, you ever get around to testing this?

Also, Quadrafacts has some great point/questions.

2003 Silverado Crew Cab
1500HD 4x4 Quadrasteer
6.0L BLACK...like the dog!

"What does the dog say?"...Woof Woof...grrr

Oh ya, and I removed those UGLY "4x4" decals on the rear fenders!

Posts: 82 | Location: North Vancouver, B.C. CANADA | Registered: March 26, 2005

Ignored post by BlackDawg posted

2004 sd

Posted

I have mine gapped at .035 but I also have a supercharger
Mark

Mark
2004 Sierra Denali ----- 2/4 drop
LSX 438 TWIN TURBO

1000 HP & 1000 ft lbs Torque
or break trying

Posts: 72 | Location: Stockton, CA | Registered: May 29, 2005

Ignored post by 2004 sd posted

Quadrasteer Junkie

Posted

Heyyy, way to bring up an old thread, Mark

!!!!

But seriously, I'm glad you did. I had forgotten all about this one

Thanks

Posts: 1014 | Location: Houston, Texas | Registered: February 06, 2005

Ignored post by MrQuadrasteer posted

Quadster formally known as Newbie

Posted

Mr. Q, this sounds like a tuning related question. Can you get Wester's to give an opinion?

__________________________________________________________________

2005 GMC Sierra 1500HD CrewCab 4x4 Quadrasteer, 6.0L, 3.73
Undercover Tonneau, Speedliner in bed, wheelwells, & rockers (color matched)
Pioneer AVIC-D1 w/NavTraffic, iPod interface, & Back-up camera
Westers 89/91 custom PCM tune, & flow-matched injectors
To come: e-fans, summer 180 degree thermostat

"I don't know what makes 'em work baby, I just drive 'em, ...WOOF, WOOF"

Posts: 123 | Location: Berkley, Michigan | Registered: July 28, 2005

Ignored post by Oddball posted

BlackDawg

Posted

quote:
Can you get Wester's to give an opinion?

Ya, good call Oddball. Mr. 4'ster, you've got a direct line to the guru. Howze about giving him a jingle on this?

2003 Silverado Crew Cab
1500HD 4x4 Quadrasteer
6.0L BLACK...like the dog!

"What does the dog say?"...Woof Woof...grrr

Oh ya, and I removed those UGLY "4x4" decals on the rear fenders!

Posts: 82 | Location: North Vancouver, B.C. CANADA | Registered: March 26, 2005

Ignored post by BlackDawg posted

Quadrasteer Junkie

Posted

That's where this came from to begin with

!!!!

Posts: 1014 | Location: Houston, Texas | Registered: February 06, 2005

Ignored post by MrQuadrasteer posted

Quadster formally known as Newbie

Posted

I just shot Lyndon an e-mail to get the official word. Will pass it on when I get it.

Posts: 123 | Location: Berkley, Michigan | Registered: July 28, 2005

Ignored post by Oddball posted

Quadster formally known as Newbie

Posted

Here is the e-mail I sent, along with answers from Lyndon.

quote:

Hi Lyndon,

I have your tune and injectors. They're in and running great, - thanks!

A thread came up on the Quadrasteer forum where the following was attributed to you:
"On our LSx motors, changing the spark plug gap from .065" (factory spec, or is it .060) to .045" is worth up to 10hp".
LYNDON: (Sometimes...we've seen 15HP with a tighter gap on the 8.1L)

The following points were brought up by another member:
"Would reducing the gap without changing the ignition module programming cause the spark to jump the gap earlier?
LYNDON: No. A spark event happens in microseconds...a tighter gap will not affect timing...

Would this be like advancing the timing?
LYNDON: No. The computer commands when the coil current is interrupted, a tighter gap will not affect timing--however it definitely makes sure
that a 'spark event' will occur by dropping the "required firing voltage" with a tighter gap. If you run a wider gap, required voltages to make the spark jump the gap are higher.

Would this cause predetonation or spark knock?
LYNDON: NO.

Would higher octane fuel be required?
LYNDON: NO.

Would emissions systems be thrown off, causing the computer to try and compensate?".
LYNDON: CLEANER emissions result if anything !

With your tune in my 2005 GMC Sierra 1500HD with the 6.0L engine, is this officially what you recommend? If so, do you have a brand preference?
LYNDON: My preference is the NGK Irridium and a tighter gap to ensure that the combustion event occurs.

This message has been edited. Last edited by: Oddball,

Posts: 123 | Location: Berkley, Michigan | Registered: July 28, 2005

Ignored post by Oddball posted

BlackDawg

Posted

Wow! That was great Oddball.
That's what I like; clean , clear questions and SHORT, CONCISE answers.

Only remaining questions for me, is for you "already tuned" members...would you need to have your custom tune, re-tuned if you tighten your gap?

Well done!

2003 Silverado Crew Cab
1500HD 4x4 Quadrasteer
6.0L BLACK...like the dog!

"What does the dog say?"...Woof Woof...grrr

Oh ya, and I removed those UGLY "4x4" decals on the rear fenders!

Posts: 82 | Location: North Vancouver, B.C. CANADA | Registered: March 26, 2005

Ignored post by BlackDawg posted

Quadster formally known as Newbie

Posted

Thanks. I asked that question too:

quote:
LOL....no retuning necessary. Just swap the plugs, and don't drop any when you're doing the job !

Lyndon

I really want to try this now. But I think it would make the most sense if I found a dyno and did a before and after comparison.

Anybody know of one in the Michigan area?

Posts: 123 | Location: Berkley, Michigan | Registered: July 28, 2005

Ignored post by Oddball posted

Quadrasteer Junkie

Posted

Get a G-Tech

Posts: 1014 | Location: Houston, Texas | Registered: February 06, 2005

Ignored post by MrQuadrasteer posted