mazdica

Hi;

Here are some details abaout my rotary love:

86 NA RX-7 EU model
- Less emission restriction
- ECU N322
- No O2 sensor
- No ECU control on ignition timing (coil distributor)
- Runs on leaded petrol (no cat)
- Aftermarket air intake
- Aftermarket silencer

Car is runing rich a lot since car is perfectly tuned (every 2500 miles service). I know that i can not put in S-AFC since my AFM is runing on 12V. But the thing what is bothering me is that in Europe we have 95unleade,98unleaded,100octane unleaded petrol and lead aditive seperate. So should i advance my timing since i can not get less octane petrol and timing is not under ECU control. How can i adjust AFR and what is best procedure to do that (With AFR gauge, wideband O2 sensor...) since car is definetly runing rich and i cant break down why (please speare me with rotary engine runs rich because i know that but this car is average like TII without any technical problem so i asume that cause is or in petrol or in AFR, since there is less control settings (like O2, ignition timing...) than in US version.

I would apriciate some technical explenation since rx-7 club is my only source of information!

thx

rx7 FC TII

iTrader: (3)

get a Haynes repair manual and read the FAQ.

ericgrau

iTrader: (1)

I have heard of RX-7's running richer than stock due to problems. I dunno exactly what causes it, but this could be a start:
1. Make sure the AFM is level (black side up). Gravity will cause the flapper to open a little more, making your engine think it's getting more air than it is. It will then add extra fuel and make you run richer.
2. Reground your ECU, and other grounds while you're at it. www.aaroncake.net has info on this, plus other general info.


European octane ratings are different from american octane ratings. I think Euro 95 is like american 91, or something like that.
A search might tell you some crude (but lousy) methods to lean out the fuel. Or maybe a way to get an SAFC to work, I dunno.

texFCturboII

iTrader: (17)

Could someone explain to me why you could not use an AFC?

Aaron Cake

iTrader: (1)

I've ran into the S-AFC issue before on earlier cars...S-AFCs cannot be used with a 12V AFM. Only 5V units.

As for the original poster, standard advice applies. Check all sensors to make sure they are operating correctly (instructions in FSM). If, for example, the ECT has failed the ECU may think the engine is perpetually cold and will richen up the mixture.

The injectors may need to be cleaned if the car is high mileage or has been sitting.