FI over 15psi boost, how much hp gain are you seeing (or ET) + 15 degrees of timing?
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FI over 15psi boost, how much hp gain are you seeing (or ET) + 15 degrees of timing?
With Meth I can add some timing without KR (so far). I'm running 15 at max tq and 18 at max hp. What HP/ET increases are you seeing with more total timing? TIA.
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I think that depends on way too many factors, but LTLHOMER told me the other night his car came alive when he put more degrees into it, I have mine set at 18deg across the board in boost right now.
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The higher the timing you run the lower your exhuast gas temps will be. That can help on turbo meltdown issues.
A lot of the Buicks will run split timing whereby on lower gears like 1/2 the timing will be bumped 3-4 extra degree's over the 3/4 gear. Doing so makes the car angrier in the first half of the track.. then keeps the flame controlled past the 1/8 mile.
I dont know if you monitor EGT's yet.. you may want to look into a simple K type thermocouple. This may help answer some questions.
Dyno's are very brief.. vs a WOT pull down a track.
I personally will shake the car down on lower timing.. then squeeze a degree or two and see how it responds. In the winter.. Ohh yeah.. it will pickup
A lot of the Buicks will run split timing whereby on lower gears like 1/2 the timing will be bumped 3-4 extra degree's over the 3/4 gear. Doing so makes the car angrier in the first half of the track.. then keeps the flame controlled past the 1/8 mile.
I dont know if you monitor EGT's yet.. you may want to look into a simple K type thermocouple. This may help answer some questions.
Dyno's are very brief.. vs a WOT pull down a track.
I personally will shake the car down on lower timing.. then squeeze a degree or two and see how it responds. In the winter.. Ohh yeah.. it will pickup
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Originally Posted by nitrorocket
I run 18 degrees timing with 18.5 psi and no meth on 93 octane. The car is definetly quicker with more timing!
What intercooler setup are you using?
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I know its an LTx motor, but I run 110 leaded race gas, and have 20* at torque peak and 23* at peak power.. this is on 20 psi. I am also running a 355 with the stock camshaft so i am not moving the same amount of air you guys are which Is why I think I am getting away with it. no knock on these settings with an 11.3-11.4 AFR at anything over vacuum.
am I gambling? it DOES feel better with the new timing set up some.
Chris
am I gambling? it DOES feel better with the new timing set up some.
Chris
#13
I know it's not totally comparable . . . but we built a 377 SBC carbureted with a T-76GTS turbo. It had FastBurn heads, so it should have run best around 30 deg. I set it at 28 for a baseline. We later found 50 hp just by bumping it to 30 deg (at about 700 fwhp). Didn't want to push our luck by going any higher.
#15
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The math model is probably a gain of 10-15hp per degree of timing that you are adding to your engine's NA baseline power. Then you are hit that with your FI setup's effective multiplier for the boost level that you are running. So it could quickly become a 15-30hp gain per degree of timing.
The other thing to consider is that's power being added accross the full RPM range where you add that extra degree of timing. That's what makes it challenging to decide where you're getting more power for 1 or 2 degress of timing or 1 or 2 lbs more of boost. The track will tell you where the sweet spot is for each setup.
Rick
The other thing to consider is that's power being added accross the full RPM range where you add that extra degree of timing. That's what makes it challenging to decide where you're getting more power for 1 or 2 degress of timing or 1 or 2 lbs more of boost. The track will tell you where the sweet spot is for each setup.
Rick
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Boost will make more power then timing, In my case anyway. I am getting about 25 rwhp per psi.
I run a Spearco 1500 cfm intercooler. I have run full boost in 95 degree weather so far with no issues.
I would'nt bother with Meth untill you want over 800 RWHP. Otherwise you are just covering up a bad tune and could lose a motor if your meth ever fails or runs out. It's a little risky, kinda like having a NOS failure. Just my $.02
I run a Spearco 1500 cfm intercooler. I have run full boost in 95 degree weather so far with no issues.
I would'nt bother with Meth untill you want over 800 RWHP. Otherwise you are just covering up a bad tune and could lose a motor if your meth ever fails or runs out. It's a little risky, kinda like having a NOS failure. Just my $.02
#17
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i have not spent much time figureing out how much the timing helps but i can tell you with my pt88 and very safe timing(13deg at 4000rpm and 15deg at 6000rpm) i get ~45rwhp per psi from 10-20psi.
i did spend a few hours one night with the gtech messing with timing and boost.
my experince tuning to the edge of pump gas was 9psi and about 19deg was a limit and 11psi and 14deg was a limit. the 11psi and 14deg was giving me more power than the 9psi and 19deg.
i did spend a few hours one night with the gtech messing with timing and boost.
my experince tuning to the edge of pump gas was 9psi and about 19deg was a limit and 11psi and 14deg was a limit. the 11psi and 14deg was giving me more power than the 9psi and 19deg.