Welcome to the Michigan FBody Association website.
The Michigan FBody Association is a centralized website for FBody enthusiasts to discuss what's going on in the Michigan area. MiFbody.com was created to allow for an easy one-stop place to find out what's going on in Michigan as far as FBody events, to find out what clubs are available in your immediate area, and for an easy place to post classifieds for items you want to sell! Our goal was to create a more close-knit community of FBody enthusiasts in the state of Michigan, and to bring Camaro and Firebird enthusiasts alike together for some amazing FBody events!
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Really? So what's up with the factory rating of 29 hwy? and people making claims of 30-31 mpg?
I've hit 29mpg before. Just not consistantly because that was ALL highway cruising at 70mph. Even a mix of highway and city I'll see 22-23mpg in the turd am. They get great mileage. Especially for what they are. I'm f'n thrilled when I hit 19mpg in the Explorer and its a the "Soccer mom express" with 100 less horsepower.
1999 Pontiac Trans Am- LS1 - M6 - ITSSLOW - 12.998@109.59 - SOLD
1994 Chevrolet Camaro - 3.4L - M5 - ITSSLWR - 16.558@85.38 2003 Chevrolet Blazer
I took it to a service station right off the freeway just so I can do strictly highway driving. 24 mpg doesn't seem right at all then based on what you guys are telling and my mods(bolt ons, headers, dyno tune) I even took out the 160 tstat and put the stocker back in.
I have some kind of air/vacuum leak if you see my other thread with the audio. Could that mess with the fuel trim?
I've never seen more than 14mpg all city, and 16 with mostly highway sinc day one.
I took it to a service station right off the freeway just so I can do strictly highway driving. 24 mpg doesn't seem right at all then based on what you guys are telling and my mods(bolt ons, headers, dyno tune) I even took out the 160 tstat and put the stocker back in.
I have some kind of air/vacuum leak if you see my other thread with the audio. Could that mess with the fuel trim?
I've never seen more than 14mpg all city, and 16 with mostly highway sinc day one.
If I'm interpreting how the engine sees a vacuum leak correctly, I would imagine that it would in fact cause problems with MPG's. The reason I say this is because if the fuel pressure regulator sees a vacuum drop, it thinks you're at WOT and dumps more fuel into the fuel rails. If you have a vacuum leak, then your fuel regulator is (at the very least) always thinking you're at partial throttle.
I took it to a service station right off the freeway just so I can do strictly highway driving. 24 mpg doesn't seem right at all then based on what you guys are telling and my mods(bolt ons, headers, dyno tune) I even took out the 160 tstat and put the stocker back in.
I have some kind of air/vacuum leak if you see my other thread with the audio. Could that mess with the fuel trim?
I've never seen more than 14mpg all city, and 16 with mostly highway sinc day one.
Our cars are like twins I have longtube headers, LS6 intake and borla exhaust with a dyno tune... 350 rwhp. What speed were you going when you got 24 hwy?
If I'm interpreting how the engine sees a vacuum leak correctly, I would imagine that it would in fact cause problems with MPG's. The reason I say this is because if the fuel pressure regulator sees a vacuum drop, it thinks you're at WOT and dumps more fuel into the fuel rails. If you have a vacuum leak, then your fuel regulator is (at the very least) always thinking you're at partial throttle.
Thing is, I've been getting crummy mileage like this since I bought the car (started this thread right after the dyno tune) It rushed me to mod it in hopes that the "problem" would be fixed that way since I tried all the regular stuff like spark plugs, wires and filters. Steve even looked over the tune twice, at normal throttle, and he said everything looks good.
Our cars are like twins I have longtube headers, LS6 intake and borla exhaust with a dyno tune... 350 rwhp. What speed were you going when you got 24 hwy?
You beat my by 15 horses haha I made 335rwhp on the mustang dyno at Vector.
I was going 70mph with the cruise control on, there was no traffic at all I was in the same speed the entire time.
You beat my by 15 horses haha I made 335rwhp on the mustang dyno at Vector.
I was going 70mph with the cruise control on, there was no traffic at all I was in the same speed the entire time.
hmm... yeah seems like you're low by at LEAST 3-4 mpg. Tires properly inflated? Spark plugs gapped properly? O2 sensors working? Clean MAF? stock gears in the rear?
hmm... yeah seems like you're low by at LEAST 3-4 mpg. Tires properly inflated? Spark plugs gapped properly? O2 sensors working? Clean MAF? stock gears in the rear?
Check to all! I'm on nt555r @ 25psi and the fronts are nt555 extremes @ 30psi. Spark plugs are Ac delcos, they were all at 40-41 out the box so I didn't touch them. 02's and MAF are good and read good when it was tuned.
and people making claims of 30-31 mpg?
357ci LT1, cammed, stalled, and driven. 
I have longtube headers, LS6 intake and borla exhaust with a dyno tune... 350 rwhp. What speed were you going when you got 24 hwy?
(started this thread right after the dyno tune) It rushed me to mod it in hopes that the "problem" would be fixed that way since I tried all the regular stuff like spark plugs, wires and filters. Steve even looked over the tune twice, at normal throttle, and he said everything looks good. 
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