rx-7ml

So I'm screwed either way right? :-D

The FJO will be a good addition to the system regardless of whether it fixes the issue. With the large injectors, it will be far easier to hit my target AFRs with the FJO than without. It can't do any harm to the current situation.

I'll get back on the mapping this weekend, play with a few more of the settings and check for sure whether the injectors (pri & sec) are firing.

rx-7ml

About the idle afr, this is why I suspect the primaries are not functioning correctly. Previously on the twins I was in the 10's for idle!

Dudemaaanownsanrx7

iTrader: (23)

If the primaries weren't working at all, the car wouldn't run, if only one of them was working, you would have a very bad sounding engine. There really isnt a way for them to partially work as they are just a solenoid that opens and closes. The only other thing I could think of is if they were very clogged, but it seems if they were clogged to the point of raising the AFR mixture in excess of 4 points that they wouldn't even open at all. Keep us posted

sk8world

iTrader: (5)

are you running a WB of your own? If so does it match up close to the dyno's? If not running your own, you need to. I have scene many dyno's WB crap out with so much abuse.. How is the idle AF just by the exhaust? Rich smoke or nice and lean? I can not imagine the 1000's to idle so lean. Are you 100% sure they are 1000's. **** even if they were smaller 14.7 is very lean at idle. I had a hard time setting up my friends with 850's to go much leaner than 11's-12's. My experience has always ended being other issues than the norm. If all semed fine before the 1000's were added I put my money on a inj. wiring issue or a bad wb sensor.

rx-7ml

Thanks for the input guys. I plan to do a lot of checking this weekend, and will let you know the outcome.

I don't have my own WB, I'm relying on the dyno WB. It's used daily to map other high performance (600hp+ Skylines) without issues, and would expect it to be accurate. You never can check enough though! The idle AFR is throwing me off a bit, so I'm going to have to check that again to be sure my details are correct.

Cheers,
Martin

rx-7ml

Tuner wasn't available the last weekend, so not been able to work on this. FJO Inj driver tipped up today from Alamo, so will see if it makes any odds. Will be pushing the tuner to look at this before Thursday

rx-7ml

well attempted to get back on this, but have been plagued with electrical issues. Think we have isolated these now, and had the car running again.

To confirm it is running 14.2 AFR at idle. We put a new probe in the dyno so we are confident that is an accurate figure. However, both the tuner and I agreed that it smelt richer!

Anyway, hoping to have the electrical issues resolved monday, and can get on with finding the cause of the lean afr's

cewrx7r1

iTrader: (2)

An O2 sensor measures free oxygen in the exhaust gases.
If a plug is misfiring, there will be both more free oxygen as it was not consumed in combustion, and it will also smell richer as you will smell the unburnt gasoline.

That is why people get confused! Leaner and richer at the same time but with different varibles.

spinnin3rd

iTrader: (3)

i have a similar problem to this , i cant lean out my afrs below 3k rpms but i can tune the car fully above that. im running stock primaries on my twins. could this be due to the same problem as 7-ml?

Dudemaaanownsanrx7

iTrader: (23)

^^ do you have o2 feedback off?

rx-7ml

Ok, we have resolved my issues.
Due to the electrical issues we ran new earths to the chassis, and a new power feed from the battery in the rear. Once we completed this, she fired up and was too rich for the sensor to read < 9afr. So it seems the lean conditions were being caused by bad electrical stabilty. Roll on the weekend for a good mapping session.


Thanks for everyone's input.