timming

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Aug 25, 2003 | 04:49 PM

jtfrog

Thread Starter

Racer

Joined: Jun 2002

Posts: 296

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From: Auburn ca

timming

I know the timming on an 86 L98 is -6 btdc. I have read post on changing it to -4 or -2. By doing this are you advancing the timming or retarding it. One more thing. set timming in park or drive with est dissconected

Aug 25, 2003 | 04:55 PM

MrJay

Burning Brakes

Joined: Dec 2000

Posts: 1,023

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From: Marietta, South Carolina, USA

Re: timming (jtfrog)

If you change the timing to 4 BTDC or 2 BTDC then you are retarting the timing because the computer will fire later but if you got to 8 BTDC or 10 BTDC then you are advancing the timing....you should have the car in park and est dissconected.

Jay

[Modified by MrJay, 9:52 AM 8/26/2003]

Aug 25, 2003 | 04:57 PM

FSTRNU

Drifting

Joined: Jan 2002

Posts: 1,608

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From: I Hate Tourists FL

Re: timming (MrJay)

:lolg: :rofl:

Aug 25, 2003 | 05:46 PM

vvv90

Race Director

Joined: Feb 2002

Posts: 11,268

Likes: 14

From: Honolulu, HI

Re: timming (FSTRNU)

TIM-MING!

Aug 25, 2003 | 06:25 PM

jtfrog

Thread Starter

Racer

Joined: Jun 2002

Posts: 296

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From: Auburn ca

Re: timming (jtfrog)

WTF This is going to sound nuts but I can not locate the timming mark. Even with the EST disconected. Car is running great with new plugs HELP :rant:

Aug 25, 2003 | 10:25 PM

Sam Lam

Melting Slicks

Joined: Apr 2002

Posts: 2,118

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From: St. Charles, MO Route 66 Corvette Club

Re: timming (jtfrog)

jtfrog: I run my 89 L98 at 8 degrees before top dead center (BTDC) of the #1 piston. The spec from the "General" is 6 degrees BTDC. Not sure about the -6 etc mentioned in above posts???? I get good throttle response with this timing setting and the TPS set at .65 volts. Make sure you unplug the timing connector before you make the timing adjustment. Hope this is helpful!

Aug 25, 2003 | 10:40 PM

FD2BLK

Safety Car

Joined: Dec 2002

Posts: 3,655

Likes: 24

From: Charleston SC

Re: timming (jtfrog)

As far as the timing mark goes with the motor off look at the balancer and find the grove then take somthing (white chalk or a silver sharpe) and mark it. After you mark it start the car and check it it should show up clear as day. For what its worth if it is running fine mark down what the timing is at now before you adjust it for a referance then adjust it and if it runs worse put it back where you found it. The other alternative is to leave it alone.