rotary help requested

[Captain KRM P5]

I did a search over on Rx7Club, saw that JDuncan did as well on the same topic actually, so I thought I'd also ask here to get some thoughts.

I bought a 1980 RX-7 from JDuncan (fun car, i must say) and have been trying to lean the car out without destroying it It is set up with a Rotary Engineering intake manifold and a pair of Weber DCD carburetors as well as the bane of my automotive existence, a fuel pressure regulator. It was running between 4 and 5 psi on the FPR and I've dialed that down to about 3 psi. Three things I've noticed; 1) the car no longer uses an 1/8 tank of fuel when I drop the hammer and 2) the car takes a little feathering on the throttle when starting her up, even when warm and 3) the car spits and pops less when she "diesels down" after turning it off.

I know the real way to lean this car out is by leaning out the dual Weber carbs. This is simply something that is way out of my realm of expertise right now, and there isn't a shop around here (Mazda included, lol) that wants to look at this car. Its like they are afraid of anything without pistons

My question is, how or where would be a good place to start in terms of tuning these carbs? How would I monitor what I need to monitor to properly tune it (a/f gauge, egt gauge?) and what numbers should I be looking for?

 

[8k RPMs]

it's gonna be a bit expensive . . . but the best way without an expert is to either buy a wideband o2 sensor (drills into the exhaust after the cat) and tune with that or (preferably) go to any chassis dyno (i.e. the car is run under load like normal driving as opposed to a dyno that doesn't apply load and more or less just tests then drivetrain) that has a wideband setup. This is ideal b/c you can easily tune as you run and get instant feedback, especially if you have a good dyno operator to help you.

Just my $0.02 . . . fc3s boy? or anyone else?

chris
'93 RX-7 R1 CYM
'04 Infiniti G35c

 

[Captain KRM P5]

i've had the protege tuned on a dyno and realize just how expensive one can be, moreso is the trouble that no one in the area even wants to try because of its age and its design.

 

[Mazdaspeedgirl]

You drove all the way to Kentucky to buy James' 7 but never went to see me when I lived there??

 

[Captain KRM P5]

You drove all the way to Kentucky to buy James' 7 but never went to see me when I lived there??

if i had known, i would have made it my sole reason for the trip...rx-7? what rx-7?

actually, he and I met near Indianapolis.