Need help by tomorrow.... Please Timing issue...
Thread Starter
Corvette ***** OG
Joined: Oct 2003
Posts: 4,776
Likes: 21
From: Charlotte NC
St. Jude Donor '05
CI VI Veteran
Need help by tomorrow.... Please Timing issue...
Since I'm sending my computer out AGAIN to get the gears redone, should I have any timing changes done? I need some help from some of the experts here. The engine is out of my '95 vert. Here are some stats.
58 mm Throttle body
355 block (bored .030", stock compression on pistons)
30 lb injectors
.586 lift exhaust
.248 @.050" duration
1.6 rollers
heads ported and polished
160 thermostat
2800 converter
3.54 gears
shorty headers
k&N filter w/ opened front case
I left the stock timing in the ECM but was thinking about having it advanced. Any suggestions?
Just out of curiousity, anyone have probably HP ideas? I was going to have it dynoed today until I realized that I had to send the computer back again since the gear change in the ECM didn't work.
Thanks,
Mark
58 mm Throttle body
355 block (bored .030", stock compression on pistons)
30 lb injectors
.586 lift exhaust
.248 @.050" duration
1.6 rollers
heads ported and polished
160 thermostat
2800 converter
3.54 gears
shorty headers
k&N filter w/ opened front case
I left the stock timing in the ECM but was thinking about having it advanced. Any suggestions?
Just out of curiousity, anyone have probably HP ideas? I was going to have it dynoed today until I realized that I had to send the computer back again since the gear change in the ECM didn't work.
Thanks,
Mark
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: Need help by tomorrow.... Please Timing issue... (C4 Newbie)
Without the ability to datalog during driving to see what's happening, advancing the timing may result in spark knock. If that occurs the PCM will retard timing and cost you hp.
I'd leave well enough alone. If you feel you have to add something, have them add 3-5* below 3000 rpm in the 75kPa regions and up. You should pick up just a little low end torque. Just remember, depending on what they've already done, adding any more could end up being too much.
By doing this blind (no datalogging), add timing at your own risk!
[Modified by 96GS#007, 2:22 PM 11/15/2003]
I'd leave well enough alone. If you feel you have to add something, have them add 3-5* below 3000 rpm in the 75kPa regions and up. You should pick up just a little low end torque. Just remember, depending on what they've already done, adding any more could end up being too much.
By doing this blind (no datalogging), add timing at your own risk!
[Modified by 96GS#007, 2:22 PM 11/15/2003]
Thread Starter
Corvette ***** OG
Joined: Oct 2003
Posts: 4,776
Likes: 21
From: Charlotte NC
St. Jude Donor '05
CI VI Veteran
Re: Need help by tomorrow.... Please Timing issue... (96GS#007)
96GS,
Thanks for your input. Though each engine will require something different, I didn't know if there was some "rule of thumb" that LT1's run better with advanced timing.
Rather than guess, I'll just leave it alone. If no one knows for sure, don't want to do anything that will be detrimental in way of performance/durability.
Thanks,
Mark
Thanks for your input. Though each engine will require something different, I didn't know if there was some "rule of thumb" that LT1's run better with advanced timing.
Rather than guess, I'll just leave it alone. If no one knows for sure, don't want to do anything that will be detrimental in way of performance/durability.
Thanks,
Mark
