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Total timing. Need distributor advice.
#106105
08/16/08 08:45 PM
08/16/08 08:45 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
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Ran my pick up in time trials today. It's a 87 Ram with a 5.9L Magnum straight from a 2500 Van. 670 Holley, M1 dual plane, shortie headers. Behind that is a wide ratio 5 speed manual. 4:1 1st, 1:1 4rth.
It's 4000lbs, 3.55's with a 28" tire.
I've slowly advance the timing from a conservative 28 deg to 32. It went from 15.11 @ 90 to 14.80 @ 91.5 mph.
Here is where I need your help. It ran it's fastest and quickest time rattling in 4rth.
Backed it to a safer 30 deg but it slowed to 14.94 @ 91.5 and I want my tenth back.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Total timing. Need distributor advice.
[Re: RapidRobert]
#106107
08/18/08 08:15 AM
08/18/08 08:15 AM
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Anonymous
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Anonymous
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Re: Total timing. Need distributor advice.
#106108
08/18/08 12:31 PM
08/18/08 12:31 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
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I've never opened the carb. So Rapid I do think some jetting is in order. The truck seems to run quicker when it's hot. Does this add up?
Cucu. The fuel is 87 octane. I thought about throwing in some booster or premium but I'm trying to set it up "as it's driven". Isn't 87 enough for a stock engine?
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Total timing. Need distributor advice.
[Re: Magnum]
#106109
08/18/08 01:00 PM
08/18/08 01:00 PM
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Anonymous
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Anonymous
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I would back down the timing or use premium.
If you have vacuum advance hooked up, that can increase your total timing way above what you think you have at part throttle cause the total mech adds to the vaccum.
You could try disconnecting the vacuum advance and trying it with the 87.
btw, a tankful of premium is about $3 more than a tank of 87
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Re: Total timing. Need distributor advice.
[Re: Paul_Fancsali]
#106112
08/18/08 07:33 PM
08/18/08 07:33 PM
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Joined: Aug 2004
Posts: 1,213 Los Angeles, CA
Mobarge
pro stock
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pro stock
Joined: Aug 2004
Posts: 1,213
Los Angeles, CA
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I'm running 38* total and have to run 101 octane - go with the premium gas, and try 34*
'71 SSP - SOLD!
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Re: Total timing. Need distributor advice.
[Re: dgc333]
#106114
08/19/08 03:35 PM
08/19/08 03:35 PM
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Anonymous
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Anonymous
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Quote:
Vacuum advance won't have any impact on WOT throttle acceleration because the intake vacuum is close to zero well below the point at which the vacuum advance would add timing.
very true but at part throttle cruise it does.
I personally do not run vacuum advance
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Re: Total timing. Need distributor advice.
[Re: dgc333]
#106116
08/19/08 09:55 PM
08/19/08 09:55 PM
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Anonymous
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Anonymous
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then put some premium in it and be done with it
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