tuning rx7 vaf correctly on a boosted application w/ 4wiretps

[jbuddy]

yea, hell im 2 or 3 clicks tighter than the oe setting of my gtr afm to get 11s under boost...

I wish thats all i had to tighten mine, im on a NA ecu with 550cc's, so it took a lil bit of time, an a dyno.

[bomdoutscort]

some how i think there was another issue if the rx7 afm made boost go down,did you tune it at all? what else was changed..... ive never seen a boost change when swapping from my stock, to rx7 to gtr......

All i did was tune the rx7 vam to run 14.5-14.7

[yunvmyegt]

maybe the boost afr was causing it to spool differently..... too gassy might not let it spool as fast? i dunno weird tho....

[ryan1]

I wish thats all i had to tighten mine, im on a NA ecu with 550cc's, so it took a lil bit of time, an a dyno.

thats all you have for managment, ie tuned vam on big injectiors?
if so how does it run?
and what turbo are you running?

[jbuddy]

thats all you have for managment, ie tuned vam on big injectiors?
if so how does it run?
and what turbo are you running?

She runs good, I hav my base timing at 7degrees, fuel pressure at 50psi, an the vaf tuned. Car ideals at 900rpm, an my a/f is 14.6 to 15.2 at ideal. Saving for mega squirt though, as I'm building my motor, an don want bandades running the motor

[ryan1]

She runs good, I hav my base timing at 7degrees, fuel pressure at 50psi, an the vaf tuned. Car ideals at 900rpm, an my a/f is 14.6 to 15.2 at ideal. Saving for mega squirt though, as I'm building my motor, an don want bandades running the motor

how long have you been running like this, and what turbo?

[jbuddy]

how long have you been running like this, and what turbo?

Been running for like 4 months now, car runs great. I cant wait to get my standalone though, so i can get rid of this vaf meter, an i hav a 60-1, .48 rear, .60 front side.

[deathtrigga]

howd u adjust fuel pressure?

[jbuddy]

i have a afpr

[deathtrigga]

what kind ? does it bolt right into the stock fuel rail?

[jbuddy]

Not bolt on, I tapped the stock fuel rail, an ran new fuel lines to make it work

[psiturbo]

On my case I went to a junk yard and borrowed another fuel regulator, let it dry out and dremmel/drilled the guts out of it so it was just another line. Buy yourself an Aeromotive or similar brand 1 to 1 adjustable fuel pressure regulator.

Things to consider:

Walbro in-tank fuel pump, sometimes it is easy to mount, sometimes not...

I have a sticky somewhere on how to install it as I have seen several variations of the mounting brackets of the fuel pump. If I remember correctly, the 323 OEM fuel pump is huge, on the Escort and Proteges is smaller, similar to the Miata. In my case the orientation of the filter was opposite from factory so I had to invert the mount.

Going back to the fuel regulator, that was one of my options to dremmel it out, I was living in California for a while and it was the only way to pass inspection.

Later I bought the adjustable fuel pressure regulator for a CRX, I had a fitting from a universal old ghetto OBX regulator (stay away from OBX brand, LOL). It is the one you cut the top and mount to your existing regulator.

My BP has the OEM reg of a CRX, cut the top and install the adjustable bracket bought on EGAY.

About the RX-7 AFM mine I adjusted until it maintained idle at 800-900 without touching timing etc. Maybe I trimmed a little the TB idle screw and that was it. Always always mark the AFM original teeth location in case you set it wrong.

Having a Walbro is highly recommended, remember you may see 50 psi but when those 550cc open up the OEM fuel pump is reaching its limits and usually does not maintain a constant pressure. If one thing you do not want is fuel starvation. You want that engine to be good on fuel when boosted. The OEM pump may read 50 at idle but who knows if it drops when doing 7000 rpms and 550 cc injectors do demand a good pump to maintain a constant pressure ALL the time.

I am not turbo yet, soon to be, finally registered my other car, an Escort GT so the project will began. Another thing, some good easy tuning can be done with an Apexi, yes and yes, it is ghetto piggy back but it does help.


By the way, What spark plugs do you run on your turbo and gap?

It is recommended to go two numbers colder or the usual NGK 7/8 and to close the gap just a little.