FBC Performance

Bret Shook, F-Body Central's Tuner will have a regular column/sticky to answer questions about the tuning process, codes, emissions, header issues with the tuning process, etc. Feel free to ask away and he'll post replies as time permits

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fbodycentral.com.....Specializing in Late Model GM Performance 410-242-0404

Slowass

Difference in maximum timing between TR55 and TR6 plugs? Large cammed N/A application.

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1999 Pontiac Firebird
Stock'ish'

FBC Performance

Now you're getting it, you aren't as slow as you say. Brett will start this thing up some time this week, so stay tuned.

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fbodycentral.com.....Specializing in Late Model GM Performance 410-242-0404

Slowass

Oh yeah??

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1999 Pontiac Firebird
Stock'ish'

Bret-FBCPerformance

I'm in here now... been out sick for awhile...

I'm gonna check the sticky up above for questions directed at me, but I'll go through the posts elsewhere as much as possible...

To answer the question above... timing is not really a question of the spark plug - although that plays a part in it. There is no set answer on what timing will work for a given combination of modifications. That is why an actual dyno tune is so important - that is what tells the tuner what the given combination wants. It will vary some depending on heads/cam/compression and other variables. As a general guideline, most LS1's range between 24 to 28 degrees at WOT. Always start low and add a degree or 2 on the dyno and see where it picks up power... the dyno never lies

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10.68@126.1 w/1.47 60' on motor
9.41@143 w/1.41 60' (back tires) on 250 shot

Slowass

Okay, let me try it this way.

TR55 or TR6 for an 11:1 402?
If I am not mistaken, I am at 33 degrees WOT. Might be the thin air that allows for that though without knock.

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1999 Pontiac Firebird
Stock'ish'

Bret-FBCPerformance

I would run a TR6 with 11.1.... I've found there is a little safety margin, and you won't see a power drop going to a TR6.

Yeah, that's a lotta timing for an LS1! It's not always a matter of if its not knocking - is it making more power with the timing so high? I've found you can often drop timing and pick up power on LS1's in many cases... I see alota cars come in where handhelds, or other tuners, have the timing cranked way up - and I have gained as much as 10 at the wheels over that tune with as much as 3 degrees less timing... But as long as you have verified it on a dyno, and the engine is where it wants to be, then some variable may be making it need that.

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10.68@126.1 w/1.47 60' on motor
9.41@143 w/1.41 60' (back tires) on 250 shot

Slowass

I will be back on the dyno in a few months. Try some things out.
Thanks!

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1999 Pontiac Firebird
Stock'ish'

Bret-FBCPerformance

Anytime! Let me know how it goes...

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10.68@126.1 w/1.47 60' on motor
9.41@143 w/1.41 60' (back tires) on 250 shot

Slowass

Hopefully it won't be TOO long, but it might be. lol

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1999 Pontiac Firebird
Stock'ish'