You would think so @16 degrees how does running 87 octane and the motor does not knock? I Could not run @12 degrees with 87 it just pings and knocks until I run 91 or 94 then she purrs like a kitten. Most I had it was @14 then I got the sct chip and had her tuned on the dyno. I have always had the stock E7 heads never changed them yet .Knock,knock,knocking on heavens door.
Maybe his balancer has moved and his timing is off.
Well friend I don’t know what to tell you and sorry to hear about that. Maybe the fact that the iron E7 heads can’t displace the heat as good as my aluminum twisted wedge heads, other than that don’t know what else could be. But I’m 100% positive I had my timing set at 16+ degrees. Now as I try to find the source of my excessive high fuel consumption I’m trying different timing settings but I’m finding that my problem is not related to timing.You would think so @16 degrees how does running 87 octane and the motor does not knock? I Could not run @12 degrees with 87 it just pings and knocks until I run 91 or 94 then she purrs like a kitten. Most I had it was @14 then I got the sct chip and had her tuned on the dyno. I have always had the stock E7 heads never changed them yet .
Have you had it on a dyno?Well friend I don’t know what to tell you and sorry to hear about that. Maybe the fact that the iron E7 heads can’t displace the heat as good as my aluminum twisted wedge heads, other than that don’t know what else could be. But I’m 100% positive I had my timing set at 16+ degrees. Now as I try to find the source of my excessive high fuel consumption I’m trying different timing settings but I’m finding that my problem is not related to timing.
Back when I had my engine in stock condition with the E7’s yes I ran at around 12 degrees.
Other than this don’t know what else to tell you, maybe others can elaborate more on this particular subject
No I haven’t. There is only one “Dyno” around here and I went there but when we were just talking I knew they didn’t know what they were talking about so I leftHave you had it on a dyno?
Yeah please Bullitt347: You “Just leave it like that”Anyone here have a car that can tell them what their "Instant Economy" is?
Take that car for a spin and drive it in a manner that results in 9ish mpg, and then try and keep it there.
It ain't easy to maintain that pace.
My 89' Mustang had a 331 cid S/C engine.
Bigger heads, cam. injectors and exhaust than the OP's ride.
I had to be driving with the engine making boost to get only 9ish mpg.
I will just leave it at that.
My speedometer and odometer have been verified and are accurate.I was reading back through your thread and saw you compared your speedo to satellite devices. However, is your trip meter rolling correctly? Maybe you’ve actually driven further than what your trip meter is showing and that’s throwing off your calculations?
You should drive a known mileage trip and see if it matches what your trip meter is saying. Just a thought.
Gears are 3.55 and TPS is set to 0.95 VoltsWhat rear gears you have? Also what is your tps set at?
Have tried a new Motorcraft fuel filter ? What is the highest octane you can get a gas station where you live ? in canada we have 94 octane at petro canada gas stations, maybe try a tank of you highest octane see what kind of Milage you get from it .Gears are 3.55 and TPS is set to 0.95 Volts
I haven’t try that filter,Have tried a new Motorcraft fuel filter ? What is the highest octane you can get a gas station where you live ? in canada we have 94 octane at petro canada gas stations, maybe try a tank of you highest octane see what kind of Milage you get from it .
Well I haven’t found that evidence yet.I agree that something is off here and am curious to find out what the actual culprit is. The only thing I can offer/share is that my Cobra II is a very similar setup. The one and only time I recorded fuel mileage with it was when I road tripped it from Atlanta to Mustang Week in Myrtle Beach. It got roughly 19-21 mpg cruising at around 70 mph. And it ran pig rich. Here's a dyno video of it a couple years later to illustrate how rich it was running - I believe most here have seen it....
View: https://youtu.be/ehtnhnB9sEM
I'd suspect that if you're burning as much fuel as your calculations are giving, you'd definitely notice some sort of evidence. A dust trail like my car gave, some sort of residue or something in the tail pipes, fuel smell in the oil (as I did....), etc.
Here's my setup for comparison:
.030 over hypereutectic flat tops with valve reliefs
Twisted Wedge 170s
1.7 roller rockers
Melling 24203 cam
long tubes
2-1/2 dual exhaust with H pipe
I've ran with both an Offenhauser 360 intake and a ProComp knock off air gap dual plane intake
at that time, I ran a Holley 650 double pump that was obviously not set up right. (It now has a throttle body injection setup that I've not driven enough to give any mileage info, but I'd suspect that it's better than before.)
1995 Mustang GT T5,
3.55 gears
265/50-15 rear tires
Speedometer gears were installed to correct the readings given all of the changes to the drivetrain.
I guess a question that hasn't been asked - have you been under the car to inspect for any signs of leakage while on the road - like cleaned sections of the floor pans from a fuel spray? I mean I understand your concern, but it doesn't sound like the engine or drivetrain are the main culprits to me.
I was using what everyone else the ones recommended by trick flow NGK FR5 but couldn’t find any so I’m using one a bit longer which is the NGK FR5-1 I posted a photo a few lines upAftermarket heads like the TFS’s require different plugs. Were you running stock style plugs?? They will be too short and not get into the combustion chamber far enough.
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