Pulley question on Whipple for my 2016

[MUSTANG GUY]

Hey guys, got a question. I’m doing the fuel system in my Whipple’d 2016 6R80 and looking to go to a smaller pulley from the stock 3.75 and wanted opinions on which I should go or if I should even leave the stock pulley and what’s a “safe zone” horsepower level? I’ll be running E85 at the track.
I’d like to keep the car on the safer side with a goal of making the car touch a 9’s at the track.
Mod list is:American racing 1 7/8 long tube headers, free flowing exhaust with stock resonators, corsa sports, Fore fuel system, ID1050X injectors, 2.9L gen 3 whipple 3.75” pulley, opg and crank sprocket done.

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[lx347cd]

Id step to a 3.5 with e85 and the fuel system.
Your gonna need to 800 rwhp to tap into the 9s. Definitely dooable.

 

[chops44]

With the mods you’ve listed I’d say a 3.25 pulley will get you ~850hp and depending on your da, that could be enough to get you a 9 sec pass. People feel the safe zone varies, but I was always comfortable with ~800 on a good tight tune. Some guys get away with 900 and the occasional rip here and there.

 

[DavidHuff]

With the mods you’ve listed I’d say a 3.25 pulley will get you ~850hp and depending on your da, that could be enough to get you a 9 sec pass. People feel the safe zone varies, but I was always comfortable with ~800 on a good tight tune. Some guys get away with 900 and the occasional rip here and there.

What kind of 1/4 mile times are you running with your current mods?

 

[Stephen@lethal]

I would recommend a 3.25 Griptec pulley. We sell a fuel system for S550 cars that is great quality for a great price and can get you a Griptec pulley that will prevent any belt slip you most likely will have with that pulley size. Hit me up if you have any questions about pullies or fuel systems. https://www.lethalperformance.com/s...fuel-delivery/fuel-systems/lethal-performance

 

[MUSTANG GUY]

Awesome, thanks guys. I assume a 3.5 inch pulley will get me to the 800rwhp mark? What can I look for power on 93 pump gas on the street with that pulley?

 

[DavidHuff]

Awesome, thanks guys. I assume a 3.5 inch pulley will get me to the 800rwhp mark? What can I look for power on 93 pump gas on the street with that pulley?

I would never try to make that kind of power with a 3.50 pulley on pump gas.I would at least put a can of Boostane in the mix.Just Saying

 

[chops44]

Awesome, thanks guys. I assume a 3.5 inch pulley will get me to the 800rwhp mark? What can I look for power on 93 pump gas on the street with that pulley?

What’s the da where you live? I can run a 3.5 pulley with no fueling issues (72#er’s on 93) but our da is terrible....2,500-6,000 depending....2,500’ is still a 1# loss in boost pressure for me, so the 3.5 acts as a 3.6 pulley. With the 3.25 pulley I run half a can of boostane (~100 oct) and my fuel trims are still as they should be.

 

[MUSTANG GUY]

The track I go to is 300’ above sea level.
From what I gather I believe a 3.65 pulley would be the Max I should go on pump gas and 3.5 on E85. Since I only use E85 at the track I may just go with the 3.65 pulley and not have to swap pulleys for the track

 

[chops44]

You could do that or run a 3.5 all the time. Pump gas plus 1/2 can of boostane on the street, then e85 at the track. Who’s tuning the car?

 

[MUSTANG GUY]

You could do that or run a 3.5 all the time. Pump gas plus 1/2 can of boostane on the street, then e85 at the track. Who’s tuning the car?

Lund

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