Pump gas limits?
Pump gas limits? What do you guys think about this? I'm not sure how to tell where my pump gas limit is, I have plenty of fuel, no methonal but the biggest FMIC I could get on my car.
408ci, approx 8.5:1CR with my current head gaskets
twin mp 70s
fuel system will handle anything i can throw at it
bigstuff3 w wbo2
Right now I don't have a electronic boost controller and I'm thinking I want to just throw some 15 springs in the gates, what do you guys think about that with no knock sensing in BS3?
408ci, approx 8.5:1CR with my current head gaskets
twin mp 70s
fuel system will handle anything i can throw at it
bigstuff3 w wbo2
Right now I don't have a electronic boost controller and I'm thinking I want to just throw some 15 springs in the gates, what do you guys think about that with no knock sensing in BS3?
TECH Apprentice
Joined: May 2005
Posts: 300
Likes: 0
From: Boise Idaho
I think you will be fine on 15 lbs and no meth, Jake is running 8.5:1 cr and is running pump up to 24 lbs. plus your fmic is bigger than the ones on my work trucks.
I guess what do all of you think of 15 lbs on 8.5:1 cr with no meth and iat's right around 120 degrees and lower?
I guess what do all of you think of 15 lbs on 8.5:1 cr with no meth and iat's right around 120 degrees and lower?
9 Second Club
Joined: Feb 2002
Posts: 985
Likes: 7
From: Lake Orion, MI
What are you running at right now? I'm assuming that 91 octane is your best pump fuel out there.
I'd probably run 9-11lbs springs and then creep up on it with the electronic boost controller. Always better to take steps 1lb at a time and then turn it down a pound when you rattle.
We ran 13lbs be fine last year on the 422ci with a conservative tune on Sunoco 94 octane for cruising and drag radial passes at the street. There was probably room for 15lbs but with a limited number of places to enjoy it on I-75, we just didn't get around to it.
Rick
Rick
I'd probably run 9-11lbs springs and then creep up on it with the electronic boost controller. Always better to take steps 1lb at a time and then turn it down a pound when you rattle.
We ran 13lbs be fine last year on the 422ci with a conservative tune on Sunoco 94 octane for cruising and drag radial passes at the street. There was probably room for 15lbs but with a limited number of places to enjoy it on I-75, we just didn't get around to it.
Rick
Rick
Originally Posted by 2001-WS6
What are you running at right now? I'm assuming that 91 octane is your best pump fuel out there.
I'd probably run 9-11lbs springs and then creep up on it with the electronic boost controller. Always better to take steps 1lb at a time and then turn it down a pound when you rattle.
We ran 13lbs be fine last year on the 422ci with a conservative tune on Sunoco 94 octane for cruising and drag radial passes at the street. There was probably room for 15lbs but with a limited number of places to enjoy it on I-75, we just didn't get around to it.
Rick
Rick
I'd probably run 9-11lbs springs and then creep up on it with the electronic boost controller. Always better to take steps 1lb at a time and then turn it down a pound when you rattle.
We ran 13lbs be fine last year on the 422ci with a conservative tune on Sunoco 94 octane for cruising and drag radial passes at the street. There was probably room for 15lbs but with a limited number of places to enjoy it on I-75, we just didn't get around to it.
Rick
Rick
I think I'll fill it up with 94 (there is one place here that has it on the pump) and go with 15 springs in the gates for now.
with 8.7:1 compression I can only manage 12-13 psi without alky, but it's also 110+ In cooler weather i'll probably be pushing 14-15, darn crappy 91 octane.
I keep the boost set at 12 psi to play it safe on 91, I also spray a little meth/water to increase my safety margine.
I keep the boost set at 12 psi to play it safe on 91, I also spray a little meth/water to increase my safety margine.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
A few weeks ago I was making 15psi at 6000rpm with my YSi, 8.7:1 CR and intake temps hitting 160degF + at the track on our 97 RON pump fuel only, and ran 11.05 @ 138mph, also with a slightly leaking BOV.
Pump gas isnt so bad.....except the price here.
At best our 97 RON would be equivalent to your 93 PON fuel, although I wouldnt be surprised if our's is worse quality.
Pump gas isnt so bad.....except the price here.
At best our 97 RON would be equivalent to your 93 PON fuel, although I wouldnt be surprised if our's is worse quality.
