Smaller pulley with less timing or larger pulley with more timing?
- Thread starter Allmachtige
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How much boost are you seeing with those pulleys? 11, 12, 13 psi? What AFR are you running?
FWIW - My SSEi with the VS, N*, P&P heads, Stage II IC, TOGs, 3" exhaust, etc. I'm running a 3.0 pulley (maxing out around 12lbs of boost and 18* of timing on 93). I'm in the upper thresholds fo boost and timing at the moment to run KR free on pump gas.
I need to continue to dial in my PE vs. RPM vs. Time
FWIW - My SSEi with the VS, N*, P&P heads, Stage II IC, TOGs, 3" exhaust, etc. I'm running a 3.0 pulley (maxing out around 12lbs of boost and 18* of timing on 93). I'm in the upper thresholds fo boost and timing at the moment to run KR free on pump gas.
I need to continue to dial in my PE vs. RPM vs. Time
x2, and what some people are not taking into consideration is how heavy the bonneville is and how much the extra little torque gained from a smaller pulley will help when launching. Its a bit of a trade off and needs to be taken to the track to be proven which works better. HP wise the added timing might make a bit more but where the power curve is means a lot at the track.
It works with 3800s if the rest of the setup is done right, but that is a big can of worms that will knock this thread out of the park.
Whats the obstacle, spraying the meth through the supercharger? Tuning? Something completely different I dont even know about?
Turbo cars love meth, would seem to me it wouldn't be much different for a S/C'd car.
Cliffs?
Well I tried a 3.4 today with 17* of timing and KR is nearly all gone, so acceleration feels solid.
I'll need to test this at the track, but what pulley size and timing decrease should I start trying out to see if the extra torque pays off?
I was guessing a 3.2 with 14-15* of timing. I could maybe run a 3.0 on stock SSEi timing, but the heat built up by that small of a pulley might hurt me.
I'll need to test this at the track, but what pulley size and timing decrease should I start trying out to see if the extra torque pays off?
I was guessing a 3.2 with 14-15* of timing. I could maybe run a 3.0 on stock SSEi timing, but the heat built up by that small of a pulley might hurt me.
So I had the Alkey injection kit. It worked well for what I had but at higher RPMs gotthe KR would started and would stay there till I let off. I was only running the 3.2 pulley aswell. Now I have the full size IC and the KR is gone and I have the 3.0 so im happy. Plus I heard with the alkey it is not good for the inside of the charger and the longer its in the worse it gets..
This is the real cruncher.
How much power you make is directly proprtional on how much pressure you can squeeze in a CC. Timing or boost can both achieve this. Boost is like a coarse control of it, timing is more of a fine control of it. So you really want to cram as much boost in as you can, then optimize timing. The wild card on a supercharged car is parasitic loss from the blower. This is where the debate comes in. It's best to look at how you will drive the car, or what you want out of it. For a fun DD, pulley down to the smallest pulley you can run. It will give the car a ton of grunt, and you can run the car from stoplight races up to 50-60 mph with no detrement to parasitic loss. If you want a quarter mile machine you need to keep the motor happy for 3 gears, so a bigger pulley and more timing is usually better. For an all around machine on an M90, it's best to intercool, run higher compression instead of either a lot of timing or boost.
How much power you make is directly proprtional on how much pressure you can squeeze in a CC. Timing or boost can both achieve this. Boost is like a coarse control of it, timing is more of a fine control of it. So you really want to cram as much boost in as you can, then optimize timing. The wild card on a supercharged car is parasitic loss from the blower. This is where the debate comes in. It's best to look at how you will drive the car, or what you want out of it. For a fun DD, pulley down to the smallest pulley you can run. It will give the car a ton of grunt, and you can run the car from stoplight races up to 50-60 mph with no detrement to parasitic loss. If you want a quarter mile machine you need to keep the motor happy for 3 gears, so a bigger pulley and more timing is usually better. For an all around machine on an M90, it's best to intercool, run higher compression instead of either a lot of timing or boost.
Thanks for the advice.
I'm more of a 1/4 mile guy so more timing on a larger pulley is probably where I want to be, but how does this yield a faster time?
I'm assuming if you go with a smaller pulley with less timing that first gear will be stronger, but the 1/4 mile setup will win in the top end. Wouldn't each setup just negate each other?
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