carbed timing
03-12-2007, 09:24 AM
#2
TECH Fanatic
iTrader: (16)
Join Date: Dec 2005
Location: Alvarado, Texas
Posts: 1,299
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Darracq
Has anyone had any spark knock with the msd curve, The fi only use around 30 total i belived, i am getting knock but my carb is lean, i dont see how it is so lean with 72 jets in front and 78s in rear on a 750 vac.
I am running 75 front and 78 in the rear and it was a little lean. I am going back to the dyno now that I got my timing issues worked out and re-tune it.
03-12-2007, 11:24 AM
#4
On The Tree
iTrader: (5)
Join Date: Nov 2005
Location: Alabama
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
So far on my LS6 i haven't noticed any knock. I am running the edelbrock ignition setup
with the #3 pill. I don't understand why y'all are running lean, with the 625 road demon
i had to reduce my IFR's and IAB's cause i was running extremely rich at idle and cruise.
Now i have it pretty much dialed in 14.4-.7 @idle, 13.9-14.4@cruise, 12.8-13.3@WOT,
this is with 70's up front and 78's in rear. What kind of vacuum #'s are you pulling at idle
and WOT? You may have to change your power valve to a looser one if you are pulling
a lot of vacuum.
with the #3 pill. I don't understand why y'all are running lean, with the 625 road demon
i had to reduce my IFR's and IAB's cause i was running extremely rich at idle and cruise.
Now i have it pretty much dialed in 14.4-.7 @idle, 13.9-14.4@cruise, 12.8-13.3@WOT,
this is with 70's up front and 78's in rear. What kind of vacuum #'s are you pulling at idle
and WOT? You may have to change your power valve to a looser one if you are pulling
a lot of vacuum.
Trending Topics
03-13-2007, 07:32 PM
#8
anyone know if there is a built in rev limit with the plug in pill, my car is breaking up real bad at around 5500 but tach could be off i guess, it runs great up to there, plugs are black except some of the ground strap looks pretty clean.
03-13-2007, 08:18 PM
#9
FormerVendor
iTrader: (5)
Join Date: Jun 2006
Location: N.E. FL
Posts: 170
Likes: 0
Received 0 Likes
on
0 Posts
timing i built my own ignition system for my carb 5.3ls and set the timing in 200 rpm steps with max advance 36* using a stock computer and efi live to set advance works really great, i don't know much about the msd box , but i know that carbs like more advance than efi .
03-15-2007, 03:58 PM
#10
Originally Posted by Vcious04
Man, be very carefull with the msd setup. I found out the other day that I was probably on the edge of blowing something up due to the factory timing on the box. What happends is the map sensor automatically adds 6-7 deg of timing untop of your mechanical curve. I was accidentatly running 44-46 deg of total timing this whole time. I basically just disabled the map sensor and am running a custom mechanical advance (like the old days of mech advance only dist).
I am running 75 front and 78 in the rear and it was a little lean. I am going back to the dyno now that I got my timing issues worked out and re-tune it.
I am running 75 front and 78 in the rear and it was a little lean. I am going back to the dyno now that I got my timing issues worked out and re-tune it.
03-16-2007, 03:39 PM
#15
I just set mine up for 32 all in by 2500, runs real good, still breaks up at around 5600 or so, i guess my valve springs are weak, it does show my tach off by a little but only 100 rpm or so, but it is hard to watch when i get on it. going to try and go to the track tomarrow.