[mrphotoman]

Just as the title says, would a roots supercharged car benefit from alcohol injection without adjusting timing? I would think from the added cooling and the increase in octane the cars ECU would no longer pull timing and the car would make more power. Would it be best to run 100% meth or a 50/50 blend of water and meth?

[dvldoc]

If your car is pulling timing then yes you will benifit from the increased timming. There is no magic formula for any car on the mix there are to many factors. Start out with 50/50 and go up or down from there to see what makes the best power for you. You will also get a faster boost build up and a few extra psi of boost spraying through the supercharger.

On my grand prix i was able to run almost 15psi at 26 degrees timing vs the factory 6psi and 15degrees of timing with supporting mods and no intercooler so it's all about the set up.

If you want the benifit of the extra timing spray before the IAT sensor.

[mrphotoman]

Originally Posted by dvldoc

If your car is pulling timing then yes you will benifit from the increased timming. There is no magic formula for any car on the mix there are to many factors. Start out with 50/50 and go up or down from there to see what makes the best power for you. You will also get a faster boost build up and a few extra psi of boost spraying through the supercharger.

On my grand prix i was able to run almost 15psi at 26 degrees timing vs the factory 6psi and 15degrees of timing with supporting mods and no intercooler so it's all about the set up.

If you want the benifit of the extra timing spray before the IAT sensor.

My car did not come supercharged and I had to move the IAT sensor to the short ram intake. would it be safe for the water/alcohol to hit that sensor?

Thanks

[bankspowered98]

I have heard however that the water/meth mixture will eat up the rotors on the sc, is this true?

[dvldoc]

If it is the older style blowers like pre-96 which had a different coating then it could strip them if using 100% methanol. New style blowers have a epoxy based coating that is not effected. By the way never, ever spary throttle body cleaner through a supercharger, Xylene in it will strip coating on all blowers.

[bankspowered98]

xcellent, thanks for the advice on the cleaner. One other quick question, I used your alls calculator for the jet sizes and it informed me that I should be running almost a 12.5 gph jet. is this too much? its a 454 vortec running 10-20 psi of boost.

[dvldoc]

Sound like your off a bit on the money, I would run a M14 with 10psi but if your going to run 14psi on that motor your going to need dual M10's

Were talking a 7.4 liter motor your going to suck down some alcohol, I would highly recommend at least a 5 to 6 gallon tank.

[bankspowered98]

I have a five gallon currently. it feels like it is bogging when the injection kicks in. is this due to the fact it is not getting enough?

[dvldoc]

If your bogging then your activating a bit too soon, But with a 7.4 LITER motor a M5 should not cause bogging even on a N/A application. Do you have the bog if you turn off the system? or is it still there.

[bankspowered98]

Spark Plug gap was the bogging problem. I ordered a 12gph nozzle from you all and should receive it today. Should I upgrade to a dual nozzle kit or will this one nozzle be enough?