Whipple Gen 5 pulley size for 91octane

[Racinjason65]

What size pulley can still be run with 91 octane? My car is a 2020 with ARH 1 7/8” catted long tubes and Magnaflow
Competition 3” catback and 160 thermostat. The kit is the Whipple stage 2 with the 3.875 pulley @10lbs of
Boost. I will be getting this dyno tuned and it’s not my daily so I don’t mind putting a little race fuel (or boostane) in the tank at every fill up. I was hoping I could run the 3.625 pulley and make about 12lbs.
Any experienced advice would be appreciated.

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[sabtaj1]

have to talk to your tuner, but I was advised by mine that I was pretty much maxed on the 3.875 with my stage 2 kit. I had the dw400 and injectors supplied with the stage 2 kit. I would also mix in a lil boostane with my 93 to be safe.

 

[engineermike]

Do you want to run 91 or whatever 91+booster brew yields?

 

[S550AC11]

AED won't tune an 18+ on pump gas 91 because of constant knock. He recently dynoed one with whipple tune on 91 and it only made 648/543 because of knock. He tuned it on E85 and it made 834/630 on the 3.875 Pulley

 

[LSchicago]

What size pulley can still be run with 91 octane? My car is a 2020 with ARH 1 7/8” catted long tubes and Magnaflow
Competition 3” catback and 160 thermostat. The kit is the Whipple stage 2 with the 3.875 pulley @10lbs of
Boost. I will be getting this dyno tuned and it’s not my daily so I don’t mind putting a little race fuel (or boostane) in the tank at every fill up. I was hoping I could run the 3.625 pulley and make about 12lbs.
Any experienced advice would be appreciated.

10#of boost is pushing it on 91. Lund wouldn't tune more than 10# even on 93.

 

[engineermike]

You can tune the 3.625 pulley to run perfectly fine on 91, but it needs a boost a pump. The timing will be pitifully low and egt’s will send it to cat-protect mode pretty quickly. There’s no real harm in running it this way, as that’s how all the ecoboosts are run. Some might see 5 deg of timing on 91, at best. Lambda is controlled by an inferred cat temp feedback loop.

Edit: I think final spark timing would be 13-14 deg, maybe 15 if cam timing, lambda, fan temps, gdi, were all optimized. Fwiw no tuner I’ve seen really takes the time to fine tune this sort of thing. “Command more than it can take and let the knock sensors do the rest” seems to be a common approach.

 

[Platinum_5.0]

Well I traded my 17 2.9 Whipple in and just got a 21 with the whipple coming and I'm not at all expecting it to make as much on pump as my 17, nor do I care to be honest. I did 744whp on the 3.6 pulley (11-12psi) and trapped 135mph. We do have pump 94 here but whatever it makes safely on pump is all that matters. Maybe 670whp? It's my E85 and 15-16psi pulley on the 21 that I'm really excited for. It's a 10R car.

 

[sabtaj1]

Well I traded my 17 2.9 Whipple in and just got a 21 with the whipple coming and I'm not at all expecting it to make as much on pump as my 17, nor do I care to be honest. I did 744whp on the 3.6 pulley (11-12psi) and trapped 135mph. We do have pump 94 here but whatever it makes safely on pump is all that matters. Maybe 670whp? It's my E85 and 15-16psi pulley on the 21 that I'm really excited for. It's a 10R car.

My 19 with stage 2 whipple on 3.875 trapped at 139 on 93. I think you will be surprised.

 

[Racinjason65]

Do you want to run 91 or whatever 91+booster brew yields?

91, any little bit gained from adding any race fuel or boostane (I’ve never been a fan of fuel additives) would be for margin Incase the 91 was less than advertised

 

[Racinjason65]

You can tune the 3.625 pulley to run perfectly fine on 91, but it needs a boost a pump. The timing will be pitifully low and egt’s will send it to cat-protect mode pretty quickly. There’s no real harm in running it this way, as that’s how all the ecoboosts are run. Some might see 5 deg of timing on 91, at best. Lambda is controlled by an inferred cat temp feedback loop.

Edit: I think final spark timing would be 13-14 deg, maybe 15 if cam timing, lambda, fan temps, gdi, were all optimized. Fwiw no tuner I’ve seen really takes the time to fine tune this sort of thing. “Command more than it can take and let the knock sensors do the rest” seems to be a common approach.

Are you saying it would need a pump booster on top of the fuel pump that came with the kit? It the DW400 pump that close to being maxed out?

 

[sabtaj1]

Are you saying it would need a pump booster on top of the fuel pump that came with the kit? It the DW400 pump that close to being maxed out?

Pretty much. I guess it’s possible but risky. Well ya can’t just switch to e85 cause it’ll drain the rails n can’t keep up with the dw400 and injectors supplied by whipple

 

[Racinjason65]

Pretty much. I guess it’s possible but risky. Well ya can’t just switch to e85 cause it’ll drain the rails n can’t keep up with the dw400 and injectors supplied by whipple

I have been running my car on E85 n/a, but don’t want to run pump E85 with the blower due to its inconsistency, and VP or other quality E85 you can buy by the pail or drum is the same price as race gas from the same manufacturers. So I’m planning on doing a fuel system as well.

 

[sabtaj1]

I have been running my car on E85 n/a, but don’t want to run pump E85 with the blower due to its inconsistency, and VP or other quality E85 you can buy by the pail or drum is the same price as race gas from the same manufacturers. So I’m planning on doing a fuel system as well.

E85 NA is fine. But need fuel system to be safe with blower. I run pump, I just test it in advance. No issues here. Hell, I even had one station testing at almost e90. Lol

 

[Platinum_5.0]

My 19 with stage 2 whipple on 3.875 trapped at 139 on 93. I think you will be surprised.

That's pretty exciting to hear actually...lol...my area usually is around 3800DA which isn't favorable but now you have me excited!

 

[engineermike]

My 19 with stage 2 whipple on 3.875 trapped at 139 on 93. I think you will be surprised.

Man that’s fast on 93. Can you give more details? Like any octane booster, what exhaust, wheels, and what DA?

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