injector sizing...

[nanokpsi]

Originally posted by Mirage2LTurbo
I ran 750cc's on my AFC, and have seen 880's idled and tuned just fine on an AFC. That's called the difference between real world experience and book knowledge.

I have seen such things as well. With hacked maf's and bypass tubes you can push the limits. The problem with big injetcors and the afc comes to leaning out on race gas. With big injectros you run out of room to really lean out. Not really a harmfull thing, but you are leaving power on the table. Not only that, but with big injectors you will be giving your car a lot of timing from deleting a lot of airflow. it jsut gets really difficult to tune and can give you headaches.

 

[Mirage2LTurbo]

True dat, God I love my Autronic

 

[pneumo]

If you run out of room on the AFC, just hack the MAF a little more. That will allow you to bring the AFC corections up a little. It will also raise some other minor tuning issues, but that's a different topic.

 

[1fast97gsx]

alright .. I'm gonna give it a shot keeping the safc and getting some 880s and back out the screw on the MAS. Hopefully it'll work out and I won't have to spend $600+ on dsmlink Oh yea ... 90% of the time I will run pump gas

 

[nanokpsi]

I wouldn't advise it. I don't think the 2g mas hacks as well as the 1g withought creating a shityy idle and what not. just bump up your base fuel pressure. It's free..........and that should give you enough room to run 23-24psi on pump unless you have a worked 1g head and 1g smim and cams. If you don't have those you will likely even have room with the 650s. at 20 psi on my 50 trim with hks cams I am only at low 80s idc. A couple more psi isn't gonna take up 15% of duty cycle. if you don't have cams you def. won't have a problem.

 

[1fast97gsx]

ok yea. No no cams. 1g head with minor porting ... nothing crazy though. Thanks.