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Re: Sniper EFI Timing Issues [Re: BigBlockMopar] #2683239
07/31/19 09:24 PM
07/31/19 09:24 PM
Joined: Jan 2005
Posts: 4,369
Michigan
MarkZ Offline OP
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MarkZ  Offline OP
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Michigan
I really appreciate all the input here guys. Finally got some time and tossed a better map together based off of the feedback I've gotten here. Haven't driven yet.

sparkmap4.PNG

1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI Timing Issues [Re: MarkZ] #2683268
07/31/19 10:34 PM
07/31/19 10:34 PM
Joined: Jan 2003
Posts: 30,947
Oregon
A
AndyF Offline
I Win
AndyF  Offline
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Joined: Jan 2003
Posts: 30,947
Oregon
It is a lot smoother but those top rows should be around 34 degrees for a big block with aluminum heads. The engine is going to be up there in the top rows at WOT. Where the engine is at WOT depends on your barometric pressure so you need to think about that but you also need to think about what happens if you drive the car somewhere else. For example, we were on the dyno today with a BB Mopar using EFI and at WOT the engine was right at 100 kpa. Barometric pressure was 102 kpa outside but inside the throttle body it was 100 kpa. So 2 kpa of pressure drop across the throttle body. On your table the timing would've been very retarded at 100 kpa. You would be giving up a ton of power with that tune.

Re: Sniper EFI Timing Issues [Re: AndyF] #2683290
07/31/19 11:57 PM
07/31/19 11:57 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
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Posts: 27,421
Balt. Md
Originally Posted by AndyF
I think you need to smooth that curve out more. I'm not sure how well you can smooth things with the handheld but with the laptop you can select an area with the mouse and then smooth it out. I wouldn't run a curve like that in an engine since the timing is jumping 3 degrees in 50 rpm. I think that would be hard on the engine to have the timing jump around like that although the load is light in that area so it might not matter too much.



That's what we did on my sons. He takes the chip card out of the hand held and puts it in the lab top. Then we smooth out the timing curve. Course we have worked with it some to get it where we like it but that's the cool thing about it is that once you start learning how much you can do with that setup you will find you can do a lot to make it run great. My sons 400 in his Dart is running real good but he is always trimming a bit here or there to see if the car likes it better and fine tuning it to work great. Good luck with yours , Ron

Re: Sniper EFI Timing Issues [Re: 383man] #2683499
08/01/19 07:03 PM
08/01/19 07:03 PM
Joined: Jan 2005
Posts: 4,369
Michigan
MarkZ Offline OP
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MarkZ  Offline OP
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Joined: Jan 2005
Posts: 4,369
Michigan
Eventually I'll get this right. up

Taking this for a ride right now.

sparkmap5.PNG

1987 Fifth Avenue - 512/518/D60
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