Cam & Drivability Question
07-10-2011, 02:59 PM
#1
Cam & Drivability Question
Ok so first car info: 95 Mustang GT. 5.0, 5 speed manual
Known mods: BBK Shorties, hollow cats, cherry bomb incinerator cat back, MSD wires, Mild Cam (?)
Bought the car with these mods in it and i'm having some tuning issues.
IS there a cam that someone might use that gives all low and mid range power but loss at high rpm? (above 4,000).
i have a ton of power and pull between about 2,800 rpm and 3,500. Timing is set about 13 degrees advanced. It starts kinda hard, just lugs over a few times before starting up. If i retard the timing, i get misfire above 3,500 rpm real bad and the SES light comes on for a rich condition about 10 times a day. If I Advance the timing more, i get awesome power above 3,500 rpm, all the way to 6K. It will smack me back in the seat and take off, but it will also spark knock like hell that advanced and hardly starts at all when it's hot.
Any ideas here??? I've also noticed car is running hot. Distributor is brand new from auto zone, OEM Spec. Coil looks factory and old. plugs are so-so in it right now.
is it possible my cam to crank timing might be off by like 1 tooth?
Somebody help! I'm tired of trying to fix this and feeling like shooting at the stars instead....
Known mods: BBK Shorties, hollow cats, cherry bomb incinerator cat back, MSD wires, Mild Cam (?)
Bought the car with these mods in it and i'm having some tuning issues.
IS there a cam that someone might use that gives all low and mid range power but loss at high rpm? (above 4,000).
i have a ton of power and pull between about 2,800 rpm and 3,500. Timing is set about 13 degrees advanced. It starts kinda hard, just lugs over a few times before starting up. If i retard the timing, i get misfire above 3,500 rpm real bad and the SES light comes on for a rich condition about 10 times a day. If I Advance the timing more, i get awesome power above 3,500 rpm, all the way to 6K. It will smack me back in the seat and take off, but it will also spark knock like hell that advanced and hardly starts at all when it's hot.
Any ideas here??? I've also noticed car is running hot. Distributor is brand new from auto zone, OEM Spec. Coil looks factory and old. plugs are so-so in it right now.
is it possible my cam to crank timing might be off by like 1 tooth?
Somebody help! I'm tired of trying to fix this and feeling like shooting at the stars instead....
07-10-2011, 04:28 PM
#2
6th Gear Member
Join Date: Apr 2007
Location: California
Posts: 10,468
First of all, verify that the timing pointer and balancer marks are correct. Then set the base timing, then set a curve. It might just want good initial, with a more mild advance curve, and good total. You can have the same initial and the same total with 2 setups, but when gives you a curve that makes the car run like crap with no power, and another curve that makes it ping.
07-10-2011, 06:56 PM
#3
2nd Gear Member
Join Date: Jun 2011
Location: Ohio
Posts: 166
Why do you think it has a cam? I'd find it odd for someone to replace just the cam and not have a TB, larger MAF, and maybe injectors.
I'm wondering if you have a vacuum leak causing a rougher low end and hard starting.
I'm wondering if you have a vacuum leak causing a rougher low end and hard starting.
07-10-2011, 07:21 PM
#4
4th Gear Member
Join Date: Jul 2008
Location: alabama
Posts: 1,812
If the car is EFI still set the base to 10* and let the ecm do its job! What are you using as far as tuning software?
If you had a 1 tooth off cam to crank issue you would have a non-running pos! Thats like 20+ degrees of timing(mechanical).
If you had a 1 tooth off cam to crank issue you would have a non-running pos! Thats like 20+ degrees of timing(mechanical).
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