11.5:1 e85 and Kraftwerks? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members

Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

LinkBack Thread Tools Search this Thread
Old 10-29-2010, 01:55 PM   #21
Free Moustache Rides
iTrader: (8)
matthewdesigns's Avatar
Join Date: Jun 2008
Location: Colorado Springs
Posts: 1,656
Total Cats: 49

I think the bottom line is this: If you want to squeeze every last drop of power out of the setup then go with E85, because it's going to work better for that reason. If you can sacrifice some hp/tq for the peace of mind that readily available pumpgas will give you, then keep it 9:1. Or if you have a hp/tq goal in mind, then get a larger SC on 91oct at the lower CR for the same results.

I was trying my best to max out the 16g setup I had on my Talon, so I kept E85 in the tank 99% of the time, and frankly I thought pumpgas was a total bore when I was forced to switch back, because max on 91oct was very different from max on E85. When I turbo my Miata, I'm going to go with pumpgas because I'm not trying to max out the turbo, and I can get everything I want on 91oct. (famous last words)
matthewdesigns is offline   Reply With Quote
Old 10-29-2010, 02:41 PM   #22
Join Date: Feb 2010
Posts: 88
Total Cats: -9

Look into restrictors for the Rotrex. If it's possible to reduce the boost to whatever you want by swapping in a smaller one, why not try? If you have to fill up with 91, just put in a 60% restrictor with a couple hose clamps.

11.5:1 would be very efficient. You'd make more power everywhere, but the tune has to be near perfect. That's the major factor here.
Trackwhore is offline   Reply With Quote
Old 10-30-2010, 10:16 PM   #23
Supporting Vendor
iTrader: (3)
emilio700's Avatar
Join Date: May 2005
Posts: 5,323
Total Cats: 1,341

The compression ratio isn't the only factor. Quality of fuel and tune complete the triangle. The Rotrex loves compression. OGK motor is 11:1 with a C30-74, (milled down Supertech 11.5:1's and chamber work). Oscar has built a bunch of race set ups for other cars using high base compression. If you are using E85 100% of the time, I'd go 11.0:1
emilio700 is online now   Reply With Quote
Old 11-01-2010, 05:53 PM   #24
Senior Member
iTrader: (5)
Join Date: Jan 2008
Location: Central, TX / Bay area, CA
Posts: 1,272
Total Cats: 3

+1 on getting a drum,easy access and save money.
Gotpsi? is offline   Reply With Quote
Old 11-01-2010, 09:58 PM   #25
Junior Member
iTrader: (1)
Join Date: Aug 2007
Posts: 387
Total Cats: 10

how much track use will the car see ? the more track use it sees, more conservative I would be on compression. but if it a street setup, I say go for it !!

but if it is a track setup. how do you plan to bring enough E85 to drive to track and back, plus track time ? if you are towing, no problem. otherwise you need to think about it carefully.

yes, I do run Rotrex and E85. love it, but again I have stock engine.
bellwilliam is offline   Reply With Quote
Old 11-04-2010, 11:44 AM   #26
Junior Member
iTrader: (8)
Join Date: Mar 2007
Location: Sarasota, FL
Posts: 334
Total Cats: 0

I want to see it, so you should do it.
chokeasphyxia is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Rotrex cooling issue gsyk59 Engine Performance 49 11-22-2015 05:11 AM
"Chimney Ethanol" E100 MiataGarage Engine Performance 5 09-30-2015 12:04 AM
1.8, C30-74 Rotrex, 9psi, 235WHP/190WTQ (E85) Lincoln Logs Dynos and timesheets 4 09-23-2015 01:26 PM
1991 Turbo Miata partout tottestad Miata parts for sale/trade 18 09-14-2015 08:52 PM
Is E-85 worth it N/A? Stealth97 ECUs and Tuning 22 08-31-2015 05:38 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 09:42 PM.