2nd Generation Specific 1986-1992 Discussion

12 MPG?

Old 02-27-2006, 04:09 PM
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I have an '88 vert and I just did a 13b streetport swap. The car runs really good and feels great at high r's. However during normal driving, it is almost dumping gas ut the exhaust and kind of gutless. I do have a cold air intake and a extremely freeflowing exhaust so I know i'm not geting the back pressure for the secondaries. So they are permanently open which would account for the gutlessness at low r's. I am only getting 12MPG on a good day (170-180 miles per tank). My a/f gauge is telling me it is running lean to stoich, but the people behind me would disagree. Does anyone have any avenues I can explore to maybe remedy my condition. I can't help but think if the fuel mixture was right it would run better. And who doesn't want there car to run better?



Thanks,

Jack
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Old 02-27-2006, 07:36 PM
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I get a solid 20mpg with my vert, but its stock



If I actually get a nice long drive with no traffic and use no AC I have gotten 25mpg if I can remember right.
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Old 02-27-2006, 08:06 PM
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Haha I get like 30+ MPG in my spec V, gotta love the 6spd. But no 12mpg isnt normal, you might wanna get an SAFC to tune the numbers down to get the best mpg.
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Old 02-28-2006, 08:12 AM
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o2 sencer maby?
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Old 02-28-2006, 11:44 AM
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I'm with the drunken idiot. With the streetport, I'm guessing you need some kind of fuel controller that will allow you to tune the fuel delivery. I don't think the stock ECU can handle a ported motor.
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Old 02-28-2006, 12:57 PM
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i've talked to the guys at Hayes Rotary in Redmond, WA, where i got the motor and they said nothing about a SAFC and i thought of the o2 sensor and he said not likely the problem. he keeps telling me the a/f adjusting screw on the pass side of the engine bay needs to be tested. and that brings up another question...is that suposed to change my a/f gauge reading when i adjust that.
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Old 02-28-2006, 01:40 PM
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Originally Posted by jack' post='804951' date='Feb 28 2006, 01:57 PM

i've talked to the guys at Hayes Rotary in Redmond, WA, where i got the motor and they said nothing about a SAFC and i thought of the o2 sensor and he said not likely the problem. he keeps telling me the a/f adjusting screw on the pass side of the engine bay needs to be tested. and that brings up another question...is that suposed to change my a/f gauge reading when i adjust that.


That's an idle adjustment. It's not likely to have any significant bearing on your fuel economy.
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Old 02-28-2006, 04:12 PM
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Ive herd also oof alot of people not even running 02 sensors and getting better mpg than that.
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Old 02-28-2006, 05:14 PM
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Originally Posted by 1988RedT2' post='804959' date='Feb 28 2006, 11:40 AM

That's an idle adjustment. It's not likely to have any significant bearing on your fuel economy.
i think otherwise stamped right on it there is an L (lean) and an R (rich) to let you know which way to turn it.

and it does make a tiny difference on my a/f meter but it really affects the way the car runs.
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Old 02-28-2006, 09:57 PM
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Originally Posted by jack' post='805006' date='Feb 28 2006, 04:14 PM

i think otherwise stamped right on it there is an L (lean) and an R (rich) to let you know which way to turn it.

and it does make a tiny difference on my a/f meter but it really affects the way the car runs.
haha no 1988RedT2 is 100% right, that only has to do with anything when the car is at idle.
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