onfire

iTrader: (17)

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.

Boostaholic

iTrader: (4)

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.

kp

iTrader: (34)

It depends, if its hot out it makes a difference, if its cooler out 15-18 degrees makes no difference in mine really. If you have a huge cam then the timing down low would help a bunch I'm sure, all you can do is play around with it and see..

Julio

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

Boostaholic

iTrader: (4)

thats some good information Julio, I should get myself a EGT gauge and check my car out.

cablebandit

iTrader: (37)

Onfire, i have run 20 degrees at 16.5 psi with the intercoolers and meth.

Navy David SS

iTrader: (13)

With 114 octane, 17 psi with air-to-ice intercooler, 23 degrees . Close to 1K rwhp

David

nitrorocket

iTrader: (12)

I run 18 degrees timing with 18.5 psi and no meth on 93 octane. The car is definetly quicker with more timing!

Got Me SOM

iTrader: (2)

damn you run that in the heat with no problems? I know my car could use somore more timing.

onfire

iTrader: (17)

Some great info above.

Boostaholic

iTrader: (4)

Good lord, thats sweet!

What intercooler setup are you using?

lcvette

iTrader: (3)

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

engineermike

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.

Incognito

Just for comparision sake, at 17 lbs on straight 93 octane I run 11 degress at pk tq and ramp it up to 15 by redline.

2001-WS6

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

nitrorocket

iTrader: (12)

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

parish8

iTrader: (6)

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.

Got Me SOM

iTrader: (2)

I always thought the reverse was true that more timing would make more power than pushing more boost.

wish my little blower could push out some more air, its maxxed out.