Minimum pulley size

[blaisa]

I have and am installing a fully forged RPG Gen 3 Coyote for a 3-2-2 build built to 11 to 1 specs. I also have a gen 5 3.0 Whipple. LTH 1 7/8" headers no cats and a double pump in tank return fuel system. Looking for 1000 WHP out of my automatic 17 Mustang. I need to know what is the smallest pulley I can run with 93 octane with 1 or 2 cans of boostane added. I know E85 would be much preferred but it isn't available close to me.


Any real experience advice would be appreciated.

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[engineermike]

That's a tall order.

To make 1000 rwhp on a Whipple 3.0 would require something like a 2.5" or 2.6" pulley.

A couple of issues stand out to me.

1. It's doubtful a 6-rib belt will work well with that small of a pulley. I guess you could try but it seems that under a 3" it's generally recommended to upgrade to a 10-rib. My friend broke a couple of 6-rib belts on the 3" pulley but I haven't, so even at 3" it's hit-or-miss for the 6-rib.

2. I don't think many would recommend attempting 1000 rwhp on a witch's brew of pump gas. You're talking 11/1 compression, 20+ psi boost, and 20+ deg timing. That's asking for a lot from a gas-station cocktail.

3. You might consider lowering the compression if you're stuck with pump gas. You could probably get up past 800 on true pump gas at 9.5/1, though most tuners won't touch it. Conversely, lowering compression will make it a little harder to reach the ultimate goal of 1000.

 

[RiotfunK]

Any tracks by you for race fuel? Don’t think that’s gonna last long trying to push that much power out of 93 tune

 

[Joshinator99]

That's a tall order.

To make 1000 rwhp on a Whipple 3.0 would require something like a 2.5" or 2.6" pulley.

A couple of issues stand out to me.

1. It's doubtful a 6-rib belt will work well with that small of a pulley. I guess you could try but it seems that under a 3" it's generally recommended to upgrade to a 10-rib. My friend broke a couple of 6-rib belts on the 3" pulley but I haven't, so even at 3" it's hit-or-miss for the 6-rib.

2. I don't think many would recommend attempting 1000 rwhp on a witch's brew of pump gas. You're talking 11/1 compression, 20+ psi boost, and 20+ deg timing. That's asking for a lot from a gas-station cocktail.

3. You might consider lowering the compression if you're stuck with pump gas. You could probably get up past 800 on true pump gas at 9.5/1, though most tuners won't touch it. Conversely, lowering compression will make it a little harder to reach the ultimate goal of 1000.

This. Compression closer to 10:1 would help a lot if you’re stuck with 93.

 

[Timbuck]

Direct port water/methanol would be a safer option instead of a pump gas cocktail.

 

[diambo4life]

Absolutely not. 3.5" is the very max I would attempt and that is nowhere close to 1000whp. Now with meth injection, you could make that 1000whp with a great tune.

 

[xr4x4ti]

If are putting the long block together yourself, you could put a thicker head gasket in to drop the compression. I think @engineermike has done some calculations on that.

I will be playing around with a similar setup this summer. I have a 9.5:1 gen 3 Aluminator and I am going to install a Gen 6 Whipple and planning on 800+ to the wheels on 93.

 

[Joshinator99]

If are putting the long block together yourself, you could put a thicker head gasket in to drop the compression. I think @engineermike has done some calculations on that.

I will be playing around with a similar setup this summer. I have a 9.5:1 gen 3 Aluminator and I am going to install a Gen 6 Whipple and planning on 800+ to the wheels on 93.

Be careful. A thicker head gasket can push your quench distance into undesirable territory, making your car *more* detonation prone… the opposite of what you’re trying to do.

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