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Topic Review (Newest First)
Today 05:03 PM
stuff1138 ^what he said
Today 04:54 PM
Junk_Poet It has been said before by other people but the driveability between 87 and 91 (I live in CA) really is a huge difference in my MK3. I've ran 91 for the last two tanks and it's crazy how much better the car feels. No more drop in power when starting from a stop with A/C on, car has more linear power throughout the gears, 2MPG increase, and it feels there is more HP.

$4 to $5 more... No brainer there.
Today 04:05 PM
coldbear
Yep......

Agreed X2!
Today 08:50 AM
1turbofocus
Quote:
Originally Posted by coldbear View Post
Anything above 100 0ctane should run a 5-10# boost. As stated.... should run OK. 100-12-15. Higher the numbers, the slower combustion rate. Makes a ton of power when set up right. 100 oct. Aviation fuel in a pinch, but not everyday.
Altho Av gas is higher octane dont confuse Av. gas with race fuel , Av gas is for high load low rpm , race fuel is for low to moderate load high rpm and yes there is a difference , Av gas shouldnt be used in a car

Tom
Yesterday 05:14 PM
felixthecat
Quote:
Originally Posted by coldbear View Post
Anything above 100 0ctane should run a 5-10# boost. As stated.... should run OK. 100-12-15. Higher the numbers, the slower combustion rate. Makes a ton of power when set up right. 100 oct. Aviation fuel in a pinch, but not everyday.
Great if your racing, but for a DDer, premium is good.
Yesterday 03:04 PM
coldbear
Fasgas is racing fuel

Anything above 100 0ctane should run a 5-10# boost. As stated.... should run OK. 100-12-15. Higher the numbers, the slower combustion rate. Makes a ton of power when set up right. 100 oct. Aviation fuel in a pinch, but not everyday.
10-21-2014 07:46 PM
dyn085
Quote:
Originally Posted by puffingonj View Post
I'm sure you would have to decrease your timing or never get into the throttle too much lol. I lowered my compression to 9.0 Ill up the boost soon just still in the tuning process.[emoji3]
That's what is great about Ford's dynamic timing-it adjusts itself to an extent. Yes, the car will fall on it's face at around 5k-5500 rpm or so with 87 but it can run it, and if you want the additional performance you just put premium in. It's kind of a win-win situation for the end-user.

Fwiw, neither of my ST's will get 87. The extra ~$4 a tank is worth the additional smiles.
10-21-2014 07:45 PM
puffingonj
Quote:
Originally Posted by coldbear View Post
Apples and Oranges here. You are talking boosted versus my 9.3 comp. stocker. I I were you, at 20 psi boosted, I might look at some FastGas.
What is fastgas?? I googled it and found nothing
10-21-2014 07:36 PM
puffingonj
Quote:
Originally Posted by dyn085 View Post
But doesn't that go against your argument of fleecing the public? I run 23 psi and can do it on 87, though I choose not to. His boosted application is a closer comparison to the high-compression and direct-injection Mk3 than your 9.3:1 is.
I'm sure you would have to decrease your timing or never get into the throttle too much lol. I lowered my compression to 9.0 Ill up the boost soon just still in the tuning process.[emoji3]
10-21-2014 07:33 PM
dyn085
Quote:
Originally Posted by coldbear View Post
Apples and Oranges here. You are talking boosted versus my 9.3 comp. stocker. I I were you, at 20 psi boosted, I might look at some FastGas.
But doesn't that go against your argument of fleecing the public? I run 23 psi and can do it on 87, though I choose not to. His boosted application is a closer comparison to the high-compression and direct-injection Mk3 than your 9.3:1 is.
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