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305cc Injectors and RX7 AFM

Old 11-02-2006, 01:08 PM
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Default 305cc Injectors and RX7 AFM

Just purchased 305cc Injectors and RX7 AFM off of brgracer

Current set up is MBC, IC, AFPR, 190HP Fuel Pump, Bipes, 2.5" exhaust after Greddy DP at 8psi

Want to go to 10psi, read others have similiar set up, just want the details: like fuel pressure, base fuel pressure, how you've adjusted the RX7 AFM, etc to get a good starting point
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Old 11-02-2006, 01:26 PM
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easiest way would be with a wideband.

But you should shoot for about 100psi of fuel pressure at 10psi of boost. Give or take, chances are that might be a little rich, I'm seeing about 11.5-12:1 AFR.

I'm using a vortech FMU so my idle pressure is 35psi and 0 ~hg. pressure 48psi.

Tuning the AFM will be tricky for you, but my is about 3-4 clicks from stock. How Tom had it should be in the general ballpark. Only way to really tell the affect of the unit at idle is watching the adjustments make changes to the wideband readings. One click could take me from a 14.7 idle to a 15.5 AFR idle.
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Old 11-02-2006, 09:21 PM
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There is also a finer adjustment (for idle and mid-throttle tip-in) screw that can be accessed by drilling a hole in the AFM. Check out Randy Stocker's AFM page here:

The surest way to tell if your mix is too rich is at idle. If it wants to 'hunt' for idle, up & down, up & down, etc., then its too rich. Tightening the spring one or two ticks can make a big diference, so be patient and make small adjustments.

When my car is in good tune, I have NO problems with the idle and it rumbles nicle @ 850 or so RPM.
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Old 12-31-2007, 07:02 PM
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I'm gonna be honest guys, there's some good info under that link that everybody keeps citing, but the pic sucks. I've been searching for a while and haven't found anything better. Anyone have any pics that could be more help? I just can't seem to locate the screw needed to adjust the spring tension even though I took the plate off of my RX-7 AFM. Either way, thanks for the help...
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Old 01-03-2008, 08:52 PM
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Do you guys with 305's run pig rich at half throttle? Mine did when I had the 305's in.
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Old 01-04-2008, 12:17 AM
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Now were talking, I discovered my pocket book said no to management until I sell the godspeed turbo. I have a fpr and a new aem wideband. U-pull it is down the road! Mabe I'll be finished next weekend!!
I'll try to get pics.
The angles have spoken and singing a new song!

Last edited by Toddcod; 01-04-2008 at 12:25 AM. Reason: it sounded dumb!
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Old 01-07-2008, 11:24 PM
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hammerhead...16psi with no change to your fueling except injectors? shenanigans.
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Old 01-07-2008, 11:30 PM
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Holy back-from-the-dead Batman!
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