GT 500 Whipple 3.8L - Anyone running with 93 Octane?

[bent98]

I am planning to do some engine mods for my 2021 GT 500. I was leaning towards going with Whipple and selling my stock SC opposed to porting it for various reasons (pricing, temps, HP scalability). I wanted to have 3 Tunes. 93 Octane tune, E85 tune using same pully as 93 and then a E85 race tune with a smaller pully. I've heard running a whipple on pump gas can be risky a even on a 3.875 pully it makes 18 psi of boost which is 6 psi over the stock Eaton SC.

I've also heard of some wonky issues with the bypass vales these units .

I know Shelby put these Whipples on King of The Road models so people are driving them on 91/93 octane. Wonder what pully size they run and how the reliability and driveability is?

any advise would be appreciated.

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[JCDriller]

Mine is at Fathouse performance waiting to get started on my build. I will be running flex fuel with a MoTec. It’ll run 91-E99, but I do plan on running 91 often as that’s what is around me most places.

 

[Cgouzoulis]

I've looked into it. You can run 93. Just won't be an aggressive timing tune.

 

[GTFORMULA]

If I end up getting the 3.8 I'll run it with 93 octane and then e85 on another tune.

 

[bent98]

What pulley are you running ? Rwhp? Are you running a catch can and have any issues with catch can? How’s the drivability ?

 

[Cgouzoulis]

Mine is at Fathouse performance waiting to get started on my build. I will be running flex fuel with a MoTec. It’ll run 91-E99, but I do plan on running 91 often as that’s what is around me most places.

That sounds like a 25-30k bill incoming

 

[JCDriller]

Mine is at Fathouse performance waiting to get started on my build. I will be running flex fuel with a MoTec. It’ll run 91-E99, but I do plan on running 91 often as that’s what is around me most places.

That sounds like a 25-30k bill incoming

haha, I wish that was all….. we’re at KR levels, but the car should be much more drivable with the MoTec.

 

[bent98]

Screw it, I’m getting the whipple.

 

[Twenty4/7]

haha, I wish that was all….. we’re at KR levels, but the car should be much more drivable with the MoTec.

the flex fuel feature alone of the motec is worth the price lol. i live 20 mins from the nearest e85 stationa and with how thirsty these cars are id be using half the fuel just getting there and back all the time. and you dont need to be at full 85% to make power.


motec will really change the game with turbo cars (lots of boost control strategies that blower cars cant make use of). but still the power reduction with the blower will be way smoother with motec than oem ecu

 

[bent98]

can you disable motec and switch back to factory ecu easily for yearly emissions ?

 

[JCDriller]

can you disable motec and switch back to factory ecu easily for yearly emissions ?

As I understand it, your ecu comes out and it plugs in.

 

[bent98]

That doesn’t sound like it can be easily switched back and forth

 

[JCDriller]

That doesn’t sound like it can be easily switched back and forth

I guess that depends on what your looking to do. It’s not particularly hard to access the ECU.

 

[OF5.0]

That doesn’t sound like it can be easily switched back and forth

If you replace the fuel injectors, SC pulley, etc, it will never be an easy switch back to the stock ECM.

For NY, you’d be well advised to look at VMP’s 50-state legal tune and hardware. It won’t get you the power of a Whipple, but you won’t have emissions testing issues.

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