I just installed an Autometer Pro-Comp Ultralite Air/Fuel Meter, and EGT Gauge. in my 1990 EFI Justy.

 

Before i installed the gauges i would notice that it would really pick up at about 4,500 rpm and pull strong to redline (6,000 rpm). Like this was a noticable increase in power, like with would thrown you back in the seat alot more.

 

I also figured the car was running a little rich, as if you are up in the rev-range and back off the gas or downshift, you'd get a really loud backfire, and probably a flame out the tail pipe.

 

Anyways. i installed the gauges, and took it out for a rip. I noticed that before the "kick of power" it would be almost in the middle of stoich on the gauge, then once it "kicked" it would jump right into rich. At full throttle in like 3rd gear the EGT is reading about 1200 deg. At cruise (like 60 kph in 3rd) it will read like 875 degrees, and idle around 600 degrees.

 

Now...what can i do to tune it?? I'm currently running Sunoco Ultra 94 Octane fuel, and timing is set to about 9 degrees.

 

I'm interested to see what regular gas will do. Or what happens if i can actually put in a pile of timingt to actually use the 94 octane fuel.

 

BTW. the car has a 2 inch exhaust with an "extremely high flow cat , and a Custom fabbed Cold Air Intake with K&N cone filter.

Just my $.02 but.... I would try some regular(87 oct.) and see what hapens with EGT, if it drops, and U are still making good power with out detonation I would stick with it. U might even make a little more power with it, and it will save U @ the pump. More timing is a mixed bag, it might make a little more power, but it might start to run hoter, run on when U shut it off, ect. It all depends on engine desine, CR, cams ect. And I have no 1st hand exp. with the Justy engine to be of any help there.

don't you want to run about 1300-1400 degrees though??

 

i thought that 1200 was a little low. Especially if it is running that rich.

 

One thing i did notice, was i put 87 in on a road trip just because i was cruising. and i got good gas mileage. Something like 250 km's to 10 l's in gas.

for what it is worth i had been told that it actually works just opposite of what you would think. that a rich engine runs cool and a lean engine runs hot.

no...i was saying that 1200 degrees would mean the car is running a little rich.

 

the hotter the egt the leaner you are running

 

Colder EGT the richer you are running.

Well...see there! I had allwase been told that high EGT was un-burend fule in the exaust=rich. Low EGT was good= burning all the fule. For all I know I could be way off on that, it's just what I have been told for years.

i think its common knowledge that high egts mean lean condition.

rich means unburnt fuel and it cools it down.