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?
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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
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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. |
Originally Posted by RotaryRocket88
(Post 11258339)
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. |
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 |
im running 720 pri, and 1200 secondarys with a walbro, stock fpr
street ported, with hks core frontmount and an older IHI RHC7 turbo |
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