If you have a Super Ram and a big cam, what is your total timing at idle, what is your base timing.

 

Your total timing will vary depending on your cam, heads, compression etc. As a general statement, I would say that your base timing should be set 6-8 degs advance and you total timing between 34-36 degs.

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D&Z Performance
"Putting Power to the Pavement"

 

Total timing is dependant upon cam, intake, compression. TOTAL TIMING AT IDLE is the total amount of timing the car has at idle. It can be calculated using this simple formula:

Timing@idle= Base Timing + Computer Timing at idle.

I realize that the computer causes the timing to jump around at idle, I just thought maybe somebody who is down with DFI or Prom tuning would possibly know.

 

YOu should probably ask on the Prom board, but DFI still has to work the same way the Stock computer does. Your base timing should not exceed 10* advance. anything below that is just to get it set to where it will idel properly at a good rpm that holds vacume up for brakes and such.
I would sudjest starting at 6* and working up to about 8*

 

18-20*

 

Are you talking about timing in the distributor, or in the Computer?

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

I just did an 88 IROC with a SuperRam and a 214/220 cam. With the ARAP chip it idles at 750 RPMs with 28 degrees timing and 6 degrees initial timing.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

I did some testing the other week with my HOT-cammed 355, comparing timing at idle vs. vacuum (using a gauge), MAF reading, and IAC count. I went from 18 to 30 degrees total timing at idle in 2 degrees increments, gaining (IIRC) 2" in Park (900 rpm) and 2.5" in Drive (750 rpm). The MAF reading went from just about 10 gps to the high 8's (estimated by where the scan tool went from telling me 10, then 9, then 8). IAC count dropped by several each time except for the last 2 tests, where it dropped 3-5 counts for each 2 degree increase in timing. Also, the idle really smoothed out with the increase in timing. BTW, I'm still running 6 degrees of initial timing since I make all my changes in the main spark advance table.

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Greg Westphal
'87 IROC 355TPI/A4