Not sure I understand the question. Plus I have close ratio 5 speed. I see a spike of rich condition for a slpit second and then consistant 10.5/1-11.5/1 AFR. I adjusted my mix last night and am seeing better AFR's now. Still not 12/1 but I'm liking my cruise and idle numbers now(idle13./1-13.5/1 cruise 15 AFR).

If i do a throttle wide open run from 3k to 6k revs in 2nd gear my AFR's are alot leaner that doing the same in 3rd gear, just wondering if you saw the same.
We now appear to be similar for idle and cruise.

Thanks, that is great info.
Cheers

TIM

What are your numbers in second under full boost? And third?

Hello guys,
I believe that if you raise the system pressure . The on boost AFR's will raise and the cruise AFR's will raise also. 15.5 is exceptable on cruise for good gas mileage , that' done by adding shims , will need CIS fuel pressure test gauge

Quattrorunner,

11.6 AFR in second gear and 10.7 AFR in 3rd gear under full boost.
All pulls from 3k rpm.

you say 10.7 in 3rd gaer under full boost , it shouls lean out the longer you stay on boost , try staying on boost longer and see what it does

Thats odd, I wouldn't be able to understand why that is, but both numbers are safe. Mine would be opposite if anything.

AFR's are taken at. High RPm so boost would be stabilised. Not sure why my AFR is different between gear selection. More playing required.

One thought, can I submit that maybe these numbers are taken in sequence? And that if you were to take the readings with time between, like a small rest between the two gears, they might be the same or similar readings?
My thinking is that maybe your pumps or a pump might be getting tired. This is just a thought and I'm not an expert but you could test two gears with a minute between readings and see?

Guys, what AFR are you going for on boost? I thought the target was 12.5 for on boost and 14.7 without.

Yeah, 12.5 or lower. I run 10.5-11.5 on boost. I may try and raise that to 12.5 or so.

I was thinking high 11's, i believe the worry is individual cylinders going lean, so if you are running 12.5 there is a chance one cylinder could be very lean. I have new injectors fitted and will be keeping it below 12 for a good safety margin, with 15 AFR for cruise.
Just got a boost gauge so i can tweak the boost a bit , the RPM gauge one goes off scale. Boost was set up on a dyno at 0.9 bar so will be interesting to see if anything has changed. (manual boost controller fitted)

Is your boost controller electronic? be carefull if its truely manual, D.O.D (Dial of Death).

yeah, be careful. You can also call it "Vanishing Point"

http://forums.pelicanparts.com/uploa...1344380039.jpg

yes it is manual and located in the engine bay. The over boost switch is still connected and appears to cut in early. I fitted a free flowing muffler and the engine started to cut out, fit standard pipe and all good, so as yet no worries with an over boost situation.