Air Fuel Ratio at light cruise - is it problem? - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 21st, 10, 12:51 PM Thread Starter
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Bill
 
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Air Fuel Ratio at light cruise - is it problem?

Under light cruising down the hiway my wideband gauge can get into the high 15s to mid-16:1 range. No pinging and all seems to be runnin fine but wondering if I need to make an adjustment. If so, what would I be looking at doing? Thinking this would require larger sized primary jets?

I live at high altitude and commonly drive in 5,000 - 7,000 ft above sea level terrain so did jet the carb down a few notches from stock so possibly too much. Engine is ZZ383 and tranny is 5spd. - I'm cruisn between 50 - 70 mph at very low 2k rpm when this scenario occurs - not pressin the pedal very much.
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post #2 of 5 (permalink) Old Jan 21st, 10, 01:16 PM
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Rod
 
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Re: Air Fuel Ratio at light cruise - is it problem?

just waiting to see I have my air/fuel gauge on my ride and would like to see about basic settings also with my new heads, great question!

Rodney

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post #3 of 5 (permalink) Old Jan 21st, 10, 01:59 PM
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Tom
 
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Re: Air Fuel Ratio at light cruise - is it problem?

My stock QJ was pulling right around 15:1 with my LM-1 wideband on the highway at cruise and ran fine. I got it up as high as 18:1 as an experiment to see if my gas mileage would improve. It didn't, car ran hotter and surged. You may be fine where you are.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #4 of 5 (permalink) Old Jan 21st, 10, 06:14 PM
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Don
 
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Re: Air Fuel Ratio at light cruise - is it problem?

Quote:
Originally Posted by 68RS-SS View Post
Under light cruising down the hiway my wideband gauge can get into the high 15s to mid-16:1 range. No pinging and all seems to be runnin fine but wondering if I need to make an adjustment. If so, what would I be looking at doing? Thinking this would require larger sized primary jets?

I live at high altitude and commonly drive in 5,000 - 7,000 ft above sea level terrain so did jet the carb down a few notches from stock so possibly too much. Engine is ZZ383 and tranny is 5spd. - I'm cruisn between 50 - 70 mph at very low 2k rpm when this scenario occurs - not pressin the pedal very much.
About what I am pulling but at a 3500 ft level, been out your way to Clines corner , didn't have any issues.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #5 of 5 (permalink) Old Feb 2nd, 10, 12:38 AM
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Steiner
 
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Re: Air Fuel Ratio at light cruise - is it problem?

My Street Avenger ran pretty lean like that at very light throttle and didn't seem to have an issue. I put some wire in the low speed air bleeds to downsize them and it got the ratio down some.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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