wiplash4-6
New Member
- Joined
- Apr 24, 2005
- Messages
- 3
First of all I hope you guys don't mind a tech question relating to Mustangs, you're definately way ahead of the curve on this stuff and the Mustang community simply refuses to embrace this stuff, even going so far as to say it's unreliable, not worth it, NEVER use more than a 50/50 mix, etc!
Last year I used a 70/30 mix on my D1SC blown/stock longblock 4.6 that ran 11.5 @ 121mph (13psi, 462rwhp457rwtq) on 104 octane in the tank. This year I built a motor and dumped the blower for a T76 Q-trim, and want to run a 100% mix of meth and use it to supply about 10-15% of the fuel enrichment so I can stick to pump gas. I'll be running 3 different tunes for 3 different boost levels, 15/20/25. The car should make about 550 rwhp on 15psi, 650 on 20psi and 700 + on 25psi, more once I get a custom turbo cams in there.
My questions are 1) is there some sort of octane calculation to figure out where I'l be at for a final octane number. I am not running a knock sensor (may install an MSD unit though) so I'd like to get an idea of where a good starting point would be for timing.
2) According to this article http://www.jagweb.com/aj6eng/superchargers.html the max power for meth is 4:1 !, so if my target on gasoline is 11.8:1, and 4:1 on meth with a 10% meth enrichment, I should see 11.0:1 on the wideband, and about 10.1:1 on a 15% mixture, correct?
I have read Razor's tuning thread and it says to tune for 11.7 to 11.8 on the alky but according to stoich's of both fuels it would seem that target A/F would be a little lean on either the meth side or gasoline side, and I'm assuming with the nozzles you guys are running you're close to 10% enrichment from meth.
Any input would be appreciated! Thanks guys.
Todd.
Last year I used a 70/30 mix on my D1SC blown/stock longblock 4.6 that ran 11.5 @ 121mph (13psi, 462rwhp457rwtq) on 104 octane in the tank. This year I built a motor and dumped the blower for a T76 Q-trim, and want to run a 100% mix of meth and use it to supply about 10-15% of the fuel enrichment so I can stick to pump gas. I'll be running 3 different tunes for 3 different boost levels, 15/20/25. The car should make about 550 rwhp on 15psi, 650 on 20psi and 700 + on 25psi, more once I get a custom turbo cams in there.
My questions are 1) is there some sort of octane calculation to figure out where I'l be at for a final octane number. I am not running a knock sensor (may install an MSD unit though) so I'd like to get an idea of where a good starting point would be for timing.
2) According to this article http://www.jagweb.com/aj6eng/superchargers.html the max power for meth is 4:1 !, so if my target on gasoline is 11.8:1, and 4:1 on meth with a 10% meth enrichment, I should see 11.0:1 on the wideband, and about 10.1:1 on a 15% mixture, correct?
I have read Razor's tuning thread and it says to tune for 11.7 to 11.8 on the alky but according to stoich's of both fuels it would seem that target A/F would be a little lean on either the meth side or gasoline side, and I'm assuming with the nozzles you guys are running you're close to 10% enrichment from meth.
Any input would be appreciated! Thanks guys.
Todd.