Sunoco 100 Octane Race Fuel

[PlatinumST]

Does anyone have experience with the Sunoco 100 octane race fuel in the Explorer? Is this something @ZFGracing has/could tune for? The E85 around here is mixed with 87 octane and tends to be around E70. Would E70 or even E50 be better than the 100 octane?

 

[TMac]

ZFG can definitely tune for it. Here's an old dyno run from Kruppa on 104 octane with the Pure 700 turbos. As to whether that's better than say e70- to get the same amount of HP you'd probably have to upgrade the injectors and pump.

 

[PlatinumST]

Interesting. It seems I've read that those tuned with an E50 blend are getting around 550hp, so if my thinking is correct, with increased RPMs, an E70 blend with stock turbos would likely surpass the 100 octane, but perhaps not significantly. Though with 100 octane at $9/gal the E70 would be much more economical in the long run, even considering the additional cost of the HPFP and injectors, and likely produce more power. Higher flowing turbos would, of course, also help.
Please feel free to correct me if my thinking/theorizing is incorrect.

 

[TMac]

Increasing the rev limit is really only useful if you're going with big turbos. And by big, I mean larger than the Pure 700s illustrated above which (barring something I'm unaware of) appear to fall off precipitously after 6300 rpm.

The ethanol blends will always make more HP due to the higher energy content at the correct air-fuel mixture. But....you definitely need additional pump and injectors to deliver all that fuel. While the dyno chart above reflects 104 octane, it's completely reasonable to assume that with 93 and those same Pure turbos should result in 500 all-wheel lb/ft of torque- (per other 93 tune dynos) resulting in approximately 530 WHP.

What this means is that with the Pure turbos, you can probably get to 530 WHP goal on 93- no mixing, no additional injector or pump. If your goals are higher, THEN go to the higher ethanol blends and add the pump and injectors which would get you to approx 580 whp.

To utilize what I recommended with the higher rev limit strategy, it's clear you're going to have to have larger turbos than are available as bolt-ons- that's shown with Kruppa's later build with the Xona turbos resulting in 704 WHP. Although, there are certainly cheaper ways to do that than how he did it!

 

[PlatinumST]

Increasing the rev limit is really only useful if you're going with big turbos. And by big, I mean larger than the Pure 700s illustrated above which (barring something I'm unaware of) appear to fall off precipitously after 6300 rpm.

The ethanol blends will always make more HP due to the higher energy content at the correct air-fuel mixture. But....you definitely need additional pump and injectors to deliver all that fuel. While the dyno chart above reflects 104 octane, it's completely reasonable to assume that with 93 and those same Pure turbos should result in 500 all-wheel lb/ft of torque- (per other 93 tune dynos) resulting in approximately 530 WHP.

What this means is that with the Pure turbos, you can probably get to 530 WHP goal on 93- no mixing, no additional injector or pump. If your goals are higher, THEN go to the higher ethanol blends and add the pump and injectors which would get you to approx 580 whp.

To utilize what I recommended with the higher rev limit strategy, it's clear you're going to have to have larger turbos than are available as bolt-ons- that's shown with Kruppa's later build with the Xona turbos resulting in 704 WHP. Although, there are certainly cheaper ways to do that than how he did it!

Great info. Thanks for taking the time to respond.

 

[NewGuy]

Jeez these numbers are higher than my stock GT350R. Bet it's not sustainable without what was mentioned above and eventually internals? OPG or Crank? No mention of head studs either, adding an additional 130 hp I'd think for sure those heads would want to lift off

 

[UNBROKEN]

Jeez these numbers are higher than my stock GT350R. Bet it's not sustainable without what was mentioned above and eventually internals? OPG or Crank? No mention of head studs either, adding an additional 130 hp I'd think for sure those heads would want to lift off

Nah…plenty of us have been running max effort 93 tunes plus spicing them up to E30 and also E50 tunes for years with no issues. Mine was tuned about 5K miles…I’ll roll over 100k on another road trip next week. Gonna throw a new set of plugs in it tomorrow because they are hard on those but everything else is solid.

 

[NewGuy]

That's incredible to hear, and better to know now with my 22. My 6.4 powerstoke needed head studs for less than 150hp modds. And for the GT350, I was told to change OPG and Crank sprocket when adding boost.