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Another Mustang bites the dust!!

This is a discussion on Another Mustang bites the dust!! within the Kill Stories forums, part of the Racing Forums category; Originally Posted by Chris Arnold The MAF, if stock, can restrict the 5.0, especially after modification. If memory serves it's ...

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    Ole Skool Shoyoas's Avatar
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    Quote Originally Posted by Chris Arnold View Post
    The MAF, if stock, can restrict the 5.0, especially after modification. If memory serves it's smaller than the stock throttle body.... something like 58mm. If it's already aftermarket, it's probably good to go. That car probably has a long way to go to catch up to you in your bolt-on LS1. Nothing a good H/C/I package wouldn't cure, but that's not easy for someone who only paid 2-3k for their car.

    Chris
    +1

    Also, he will most likely need a better flowing set of heads to run with you. A good port/polished set of E7's won't flow near as good as a nice out the box set of aftermarket trickflows or afr's. the headers and intake will help but to run with an LS1 he'll need and upgraded maf, injectors, fuel system, tune, and some foced injection would do wonders.

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    I don't sell out! blackSS01's Avatar
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    Well, short throw shifter is in the mail. Headers are being picked out. I told him go LT not shortys. They should be in the mail soon. I need to get going on my Maro, haven't modded it in a while.

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    I don't sell out! blackSS01's Avatar
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    Well, an update and question for the Mustang Men. It has stock MAF which looking at it, the thing sucks balls. Also the car seems to rapidly go thru the rpm range. I am wondering if the gears have been changed. It is 2,000 rpms at 60 mph and at 65 mph, it is turning 2,200 rpms. Is that normal?

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    With the stock T5 (.68 OD) and stock height tires (~25.6"), 2000 rpm at 60 mph would imply a 3.73 gear (could be 3.55s if the rpm @ 60 mph is actually 1900 rpm).

    Both those gear ratios were (and still are) very popular upgrades for Fox-body 5.0s, which came with either 2.73 or 3.08 from the factory.

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    I don't sell out! blackSS01's Avatar
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    Thanks for the info. I figured they were changed because of the rapid acceleration of the rpms. It revs faster in 1st then my car. Which when he is shifting, my car is in the power band for 1st. Thats how I walk him.

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    Quote Originally Posted by BLKCLOUD View Post
    Both those gear ratios were (and still are) very popular upgrades for Fox-body 5.0s, which came with either 2.73 or 3.08 from the factory.
    Don't forget the 3.27:1 option for the AOD cars.

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    Quote Originally Posted by blackSS01 View Post
    Well, an update and question for the Mustang Men. It has stock MAF which looking at it, the thing sucks balls. Also the car seems to rapidly go thru the rpm range. I am wondering if the gears have been changed. It is 2,000 rpms at 60 mph and at 65 mph, it is turning 2,200 rpms. Is that normal?
    I would say it has 3.08 they were optional or may be were changed to 3.27. When I bought my 85 5.0 mustang it was stock and I believe it and the 2.73s, on the freeway when I was at 60-65MPH I would be right under the 2,000 mark may be 1800-1900 on 5th gear

    I doubt it has 3.55s or 3.73s because then I swapped out the whole rear end replacing it with a 93 cobra 8.8 with 3.73s and on the freeway on 5th gear I was just under 3K

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    There is no way 3.73s gave you 3K @ 60 mph with near-stock sized tire and a stock T5. The math simply doesn't afford it.

    Go here and plug in the numbers, or do the math manually. I used the following:

    Gear ratio: 3.73 (or whatever you are trying to figure out)
    Transmission gear ration: .68 (5th gear in a typical T5)
    Tire Diameter in inches: 25.6" (225/60/15....225 * .6 / 25.4 * 2 + 15)
    Want to compute: Engine RPM
    Engine RPM: leave it alone, this is what you'll be computing
    Vehicle Road Speed: 60

    Result: 1998 rpm

    Plugging in 3.08s (everything else the same) gives you 1650 rpm. 3.27s gives 1752 rpm. To get 2900-3000 rpm in 5th with a stock tire would require a gear of greater than 5.40.

    Bob

    PS....as an FYI...I've had numerous gear ratios in several Mustangs with several different transmissions & tire sizes.

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    I don't sell out! blackSS01's Avatar
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    Now I have all the Ford guys on a Chevy site fighting between each other Just kidding, thanks guys for the help, appreciate it. To totally make sure, his rear is leaking, we are going to pull the cover and count the teeth while we have to change the gasket. But it is forsure at 2,000 rpm on the dot for 60 mph.
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    Quote Originally Posted by BLKCLOUD View Post
    There is no way 3.73s gave you 3K @ 60 mph with near-stock sized tire and a stock T5. The math simply doesn't afford it.

    Go here and plug in the numbers, or do the math manually. I used the following:

    Gear ratio: 3.73 (or whatever you are trying to figure out)
    Transmission gear ration: .68 (5th gear in a typical T5)
    Tire Diameter in inches: 25.6" (225/60/15....225 * .6 / 25.4 * 2 + 15)
    Want to compute: Engine RPM
    Engine RPM: leave it alone, this is what you'll be computing
    Vehicle Road Speed: 60

    Result: 1998 rpm

    Plugging in 3.08s (everything else the same) gives you 1650 rpm. 3.27s gives 1752 rpm. To get 2900-3000 rpm in 5th with a stock tire would require a gear of greater than 5.40.

    Bob

    PS....as an FYI...I've had numerous gear ratios in several Mustangs with several different transmissions & tire sizes.
    well I never said I was at 3K going 60 I said close to 3K more like 2700-2800K

    and i did not have my car stock at all I had cam, the 93 cobra rear end with 3.73s, Cobra transmission, heads, intake, 600CFM edelbrock carb., lowered, etc and some thick tall walled tires I had the stock 15 inch wheels

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    2700-2800 is still over a 4.88 gear.

    The "Cobra" (ie...Z-code....I had one in my 88...with 3.73s) transmission has the same 5th gear as the stocker.

    Tall tires reduce rpm.

    All that engine stuff and being lowered does not affect cruising rpm either, thus is irrelevant.

    I would suggest your speedo, tach, or both were significantly off.

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    Quote Originally Posted by BLKCLOUD View Post
    2700-2800 is still over a 4.88 gear.

    The "Cobra" (ie...Z-code....I had one in my 88...with 3.73s) transmission has the same 5th gear as the stocker.

    Tall tires reduce rpm.

    All that engine stuff and being lowered does not affect cruising rpm either, thus is irrelevant.

    I would suggest your speedo, tach, or both were significantly off.
    I know my speed guage was really off by like 25-35 MPH don't really remember its been a while

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    Quote Originally Posted by mike302 View Post
    I know my speed guage was really off by like 25-35 MPH don't really remember its been a while
    Hmmm...you didn't mention the fact that your speedometer was off by a mere 25-35mph in your previous post. That's probably while your tach showed 3000rpm. But, okay.

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    Quote Originally Posted by N20LT4 View Post
    Hmmm...you didn't mention the fact that your speedometer was off by a mere 25-35mph in your previous post. That's probably while your tach showed 3000rpm. But, okay.
    yea I never got the chance to swap out the speedo gear and I think they could've even been 410s or something you would just hear the car forced like if it was in higher RPMs???

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    Quote Originally Posted by N20LT4 View Post
    Don't forget the 3.27:1 option for the AOD cars.
    I might be wrong here, but I thought that the AOD cars came with 3.08s in foxes.

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    Quote Originally Posted by Chris Arnold View Post
    I might be wrong here, but I thought that the AOD cars came with 3.08s in foxes.
    In 85s they were, but I think it was the same for all years

    "Axle ratios in 85 were 2.73:1 (standard) and 3.08:1 (optional) for the 5-speed and 3.27:1 (standard - no options) for the AOD."

    http://www.mustanggt.org/85gt.htm

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    Quote Originally Posted by mike302 View Post
    In 85s they were, but I think it was the same for all years

    "Axle ratios in 85 were 2.73:1 (standard) and 3.08:1 (optional) for the 5-speed and 3.27:1 (standard - no options) for the AOD."

    http://www.mustanggt.org/85gt.htm
    In the later year fox-bodies, both T-5 and AOD cars came standard with 2.73:1 gears.

    Optional for the T-5: 3.08:1
    Optional for the AOD: 3.27:1

    http://www.allfordmustangs.com/forum...3-mustang.html

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    Yeah, looks like you've got the right idea here. I hate being wrong. Oh well, twice in 15 years isn't so bad.....

    Chris

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    Another question to spark debate. The guy said it had 93 heads all re-done. The heads are really clean and the driver side has a 7 stamped on top on the front of the head and a T on the back. The passenger head has a 8 stamped were the 7 is and a T also. So they have T7-Driver T8-Passenger. Does anyone know what that is??

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    ^^^ it means mustangs suck.

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