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Old 04-17-2014, 05:45 PM   #201
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Interesting that the above engine still has a front waterneck.
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Old 04-17-2014, 06:08 PM   #202
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What's the power advantage of E85 over 93 octane percentage wise? Is it 20% more power or something like that?
Will the gas mileage be the same with E85 or is it less?
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Old 04-17-2014, 06:16 PM   #203
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Quote:
Originally Posted by my97miata View Post
What's the power advantage of E85 over 93 octane percentage wise? Is it 20% more power or something like that?
Will the gas mileage be the same with E85 or is it less?
If only this question had been asked at some point in the past somewhere by somebody, we'd know by now!
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Old 04-17-2014, 07:26 PM   #204
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What's the power advantage of E85 over 93 octane percentage wise? Is it 20% more power or something like that?
Will the gas mileage be the same with E85 or is it less?
5% more power, no other changes. Some (non Miata) engine combinations will see 7-8% gain. 30% less economy at full load, 15-20% at light load.

The difference here is that the BP combustion chamber, even coated, can't tolerate CA91 with 13:1 CR. That requires race gas which is tough to find in California for less than $7/gal. New laws here mandate that it can only be sold for racing use. Very difficult to buy 100 unleaded from a pump and into your daily now. E85 OTOH, make seven more power, is CARB legal for highway use and can be found for about $3.75/gal.

Powered by corn, subsidized by your tax dollars.
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Old 04-18-2014, 09:22 AM   #205
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Powered by corn, subsidized by your tax dollars.
If you do not put that somewhere on the car, I will drive out and kick you in the shin
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Old 04-18-2014, 12:16 PM   #206
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I know, we need bumperstickers with that on it.
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Old 04-22-2014, 11:47 PM   #207
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Gave up trying to get a response from Maruha for a VP header. Called Ocean and Chikara. He was able to get us hooked up. Should be here in a few weeks. Looking forward to testing it against the Racing Beat. Maybe this time I can twist Andrews arm into letting me test his Stahl Torquemaster 2000
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Old 04-25-2014, 10:24 PM   #208
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One of these days I hope you put some boost on one of your creations. When I see 200whp NA I start to wonder what a little boost on top of that would do.
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Old 04-25-2014, 10:39 PM   #209
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One of these days I hope you put some boost on one of your creations. When I see 200whp NA I start to wonder what a little boost on top of that would do.
Me too
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Old 04-26-2014, 12:06 AM   #210
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One of these days I hope you put some boost on one of your creations. When I see 200whp NA I start to wonder what a little boost on top of that would do.
Kablooey!
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Old 04-26-2014, 12:09 AM   #211
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bolt on one of those TSE turbo kits that are so common these days :P
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Old 04-26-2014, 12:29 AM   #212
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Kablooey!
Tom has a Rotrex. You would be surprised at how much base compression you can run with big boost and race gas or E85 with one. Charge temps tend to be significantly lower than a typical turbo at the same pressure differential. You can match a C30-74 charge temps at say 15psi but you need a relatively bigger turbo to do it.

The Bonnevile LSR cars with giant Rotrex superchargers running insane amounts of boost do so with CR's that would look just about right in an EP motor. Running 15psi with a C30-74 and 12.0:1 on E85 is no big deal.
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Old 04-26-2014, 01:30 AM   #213
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Running 15psi with a C30-74 and 12.0:1 on E85 is no big deal.
I agree.

I am currently running 11:1 CR with 12psi of boost on E85. I would not hesitate to bump CR to 12:1.
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Old 04-26-2014, 03:24 AM   #214
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What are your thoughts about gearboxes, that sort of setup would be basically useless without a very close ratio gearbox right?

Dann
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Old 04-26-2014, 03:56 AM   #215
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What are your thoughts about gearboxes, that sort of setup would be basically useless without a very close ratio gearbox right?

Dann
The planned dog gearset for the 6speed might fit like a glove.
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Old 04-26-2014, 01:06 PM   #216
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Supermiata at Bonneville in 2015?!
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Old 04-26-2014, 01:39 PM   #217
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For the time being, we will run the same AZ6 everyone else does. If we are able to get the dog box into production, kit#1 will be behind this engine.

I bought an SCTA rule book a while back. That is step 1 of going to Bonneville. It's an archaic organization, more of a brotherhood than a sanctioning body. No rules on the web. You have to buy a little book they mail to you. Only a few classes a Miata could have a chance in without a million dollar budget. We may think about doing something for 2015.
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Old 04-27-2014, 11:28 AM   #218
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Originally Posted by k24madness View Post
I agree.

I am currently running 11:1 CR with 12psi of boost on E85. I would not hesitate to bump CR to 12:1.
What about using 93 octane? Very common here in Tampa, Florida.
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Old 04-27-2014, 11:55 AM   #219
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Quote:
Originally Posted by my97miata View Post
What about using 93 octane? Very common here in Tampa, Florida.
In the context of running 10-15psi ~40cfm with 13.0:..no. E85 or nothing
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Old 05-01-2014, 11:18 AM   #220
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Quote:
Originally Posted by emilio700 View Post
Tom has a Rotrex. You would be surprised at how much base compression you can run with big boost and race gas or E85 with one. Charge temps tend to be significantly lower than a typical turbo at the same pressure differential. You can match a C30-74 charge temps at say 15psi but you need a relatively bigger turbo to do it.

The Bonnevile LSR cars with giant Rotrex superchargers running insane amounts of boost do so with CR's that would look just about right in an EP motor. Running 15psi with a C30-74 and 12.0:1 on E85 is no big deal.
Does some of that flexibility in CR/Fuel/Boost with a Rotrex come from less boost at TQ peak vs redline compared to a turbo that has about full boost at peak TQ RPM? Or is all the really manageable IATs?
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