Rtek Who is running 1200cc injectors?
Thread Starter
Joined: Nov 2002
Posts: 1,790
Likes: 3
From: Travis AFB, CA to Okinawa, Japan
Who is running 1200cc injectors?
Who on here is actually running 1200cc secondary injectors successfully? What brand injectors are you running and how much correction are you having to use?
to give you an idea I have 820 x 1000 on the 550 x 720 map and on the very last row for (15+) I am still in the negative numbers.... I have a hybrid turbo with a to4b v-trim. Im around 11.3 - 11.5 afr @ 13ish psi. Using that 720 x 720 setting made the car go crazy. Same injectors with everything at 0 the car was running super lean 15+ afrs
The 720/720 setting works perfectly for me w/ 720/880cc injectors; your problem may be the oversized primaries. I tried 550/720 briefly, but the engine wouldn't idle and it sputtered like crazy under any kind of load.
There should be enough correction room with 720/1200cc injectors on the 720/720 setting.
3840 cc / 2880 cc = 1.33
I think the injector transition point at low boost is going to require a hell of a lot of fuel pulled to keep it from dipping into the 9-10 AFR range.
There should be enough correction room with 720/1200cc injectors on the 720/720 setting.
3840 cc / 2880 cc = 1.33
I think the injector transition point at low boost is going to require a hell of a lot of fuel pulled to keep it from dipping into the 9-10 AFR range.
The 720/720 setting works perfectly for me w/ 720/880cc injectors; your problem may be the oversized primaries. I tried 550/720 briefly, but the engine wouldn't idle and it sputtered like crazy under any kind of load.
There should be enough correction room with 720/1200cc injectors on the 720/720 setting.
3840 cc / 2880 cc = 1.33
I think the injector transition point at low boost is going to require a hell of a lot of fuel pulled to keep it from dipping into the 9-10 AFR range.
There should be enough correction room with 720/1200cc injectors on the 720/720 setting.
3840 cc / 2880 cc = 1.33
I think the injector transition point at low boost is going to require a hell of a lot of fuel pulled to keep it from dipping into the 9-10 AFR range.
Thread Starter
Joined: Nov 2002
Posts: 1,790
Likes: 3
From: Travis AFB, CA to Okinawa, Japan
Picked up a pair of FIC (modified Rochester) 1150cc injectors and have been running them for about a week now. Car feels great, but took some time to get them dialed in. Still running a little rich still in boost, but taking it slow and taking my time and making small changes. At 15-16psi my duty cycles are around mid to upper 80's with afr's in the mid 10's between 4000-5500 rpm and low 11's above 5500. Correction 0-4psi is below -20%.
Should be going to the dyno in a week to see how she does.
Street ported S4 engine, 720's + 1150's, walbro 255, Aeromotive fpr, greddy fmic, ngk 9's all around with jacobs fc1000 ignition on lead, Borg Warner s360 turbo .88, hks log mani, stock s4 afm
Should be going to the dyno in a week to see how she does.
Street ported S4 engine, 720's + 1150's, walbro 255, Aeromotive fpr, greddy fmic, ngk 9's all around with jacobs fc1000 ignition on lead, Borg Warner s360 turbo .88, hks log mani, stock s4 afm
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