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adjusting timing on tpi

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Old Sep 8, 2014 | 11:56 AM
  #1  
Black88Z's Avatar
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From: Charlotte, NC
Car: 1988 IROC-Z Camaro, 1981 Trans Am
Engine: 350 TPI, 301 N/A
Transmission: 700r4, 350thm
adjusting timing on tpi

I have read where you can unplug the connector that allows the computer to adjust timing and adjust base timing. I know factory base timing is 6 degrees. I've read several people saying you can bump the timing up to 12 on a stock ish engine and it'll be ok, any more and it's to much. My engine is fairly stock, some bolt ons, an exhaust, and opening up the air intake big time. I was thinking of go with 10 degrees bar, to keep it on the safe side.

I've been reading lately that if you adjust base timing this way, it somehow hurts performance. It doesn't make sense to me, but I figured I'd check with you guys on it first. Should not make a difference, but its the 350tpi.

Thanks
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Old Sep 8, 2014 | 12:46 PM
  #2  
8Mike9's Avatar
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Joined: Jul 1999
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From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Re: adjusting timing on tpi

I suggest you try 8 first, and move in 2 degree increments.

Mine will ping over 8.

Edit:

It's possible that some are getting knock retard from pinging, with too much base timing,
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Old Sep 8, 2014 | 06:09 PM
  #3  
Black88Z's Avatar
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From: Charlotte, NC
Car: 1988 IROC-Z Camaro, 1981 Trans Am
Engine: 350 TPI, 301 N/A
Transmission: 700r4, 350thm
Re: adjusting timing on tpi

Thanks for the advice. did you notice any difference? (probably not at just 2 degrees lol)

Any one else have any input?
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Old Sep 8, 2014 | 10:06 PM
  #4  
8Mike9's Avatar
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From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Re: adjusting timing on tpi

Didn't notice anything, I'd just set it at 8 years ago, once I found the EST connector and learned how to check/set the timing, pretty sure I set it back to 6 for smog teasting, and just left it.

The majority, if not all of, your performance is done via PROM tuning.
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Old Sep 9, 2014 | 11:44 AM
  #5  
Black88Z's Avatar
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Joined: Nov 2011
Posts: 507
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From: Charlotte, NC
Car: 1988 IROC-Z Camaro, 1981 Trans Am
Engine: 350 TPI, 301 N/A
Transmission: 700r4, 350thm
Re: adjusting timing on tpi

right. I plan to order a chip from a man named John Wayne who custom burns them, I've been hearing good things about the chips he sells.
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Old Sep 9, 2014 | 09:33 PM
  #6  
8Mike9's Avatar
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Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Re: adjusting timing on tpi

I talked to some burners, not a lot of gain on a stock set up....just saying, wish TP was still here.
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Old Sep 9, 2014 | 09:42 PM
  #7  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: adjusting timing on tpi

Originally Posted by Black88Z
right. I plan to order a chip from a man named John Wayne who custom burns them, I've been hearing good things about the chips he sells.
Is this the guy on FB? I haven't heard much good. I wouldn't waste time with a aftermarket chip until you do way more.
Bump the timing,use highest octane you can, (93) and fuel PSI along with other "free mods" will help more than another chip. (do it at the tack for best results)
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Old Sep 9, 2014 | 09:57 PM
  #8  
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From: SC
Car: '87 IROC-Z | '99 SS
Engine: LB9 | LS1
Transmission: 700R4 | T56
Re: adjusting timing on tpi

If you need a tune... "Tuned Performance" is the man.
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