I'm new to using a wideband, and just installed an LC-1 in my 88 TII with LTX12s ECU.

Setting up idle has been a challenge, and I've read a ton of threads on the issue. One concern is that many of you have stated that you can't idle a Microtech driven engine leaner than 12.5 or so.

Mine is idling pretty smoothat 1000rpm, 20"Hg and 14.1. Would you think that my LC-1 might need recalibration? If I enrich the mixture to 12.5, it still idles, but lopes like it's too rich. When I lean it back out to 14+, it runs very smooth.

I did follow installation/cal instructions to the letter although there has been a bit of time between installation and finally getting the engine to run.

Thoughts?


- kel -

 

ANYone?

am I the only one who can idle a street port at 20" 1000RPM and 14:1?

I'd be thrilled to just have a good engine, but I suspect otherwise.

Anyway, the weekend plan is to take the O2 sensor out and do a fresh free-air calibration, then see what it reads afterward - no changes to the maps.

Update will follow (just for the record)

- k -

 

Not sure where you're getting that info about not idling leaner than 12.5:1. I'd never even attempt to tune an idle that rich. My bridgeported car idles at about 14:1 as well.

 

ive got mine at 12.5 and it wont like it any leaner all the other bp and j port are the same

 

I searched on more than one occasion for various Microtech tuning topics. I got my impression here:

https://www.rx7club.com/showthread.p...light=idle+afr
Starting at post #9, and then 12, 18, 19, 30, 31

Then this thread: https://www.rx7club.com/showthread.p...light=idle+afr
Post #8

And: https://www.rx7club.com/showthread.p...light=idle+afr
Post #25

and: https://www.rx7club.com/showthread.p...light=idle+afr
Posts 2, 6 & 7

and: https://www.rx7club.com/showthread.p...light=idle+afr
Posts 5, 7 & 14

and: https://www.rx7club.com/showthread.p...dle+afr&page=2
Post 38, 39 & 44

and: https://www.rx7club.com/showthread.p...light=idle+afr
Post 2

and: https://www.rx7club.com/showthread.p...light=idle+afr
Post 7

and: https://www.rx7club.com/showthread.p...light=idle+afr
Posts 7, 9, 10 & 11

In review, I do see that many mention AFR at 13:1, but often that's described as too lean, so I thought that at 14+ something must be up.

BTW, just bought the book you recommended in one of the discussions I was reading "Performance Fuel Injection Systems". Thanks for the recommendation, am reading it now.


- kel -


.

 

No idea why those people are having issues. Maybe not enough timing, or their injector staging is wrong, fuel pressure too high, etc.