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Old 07-07-2008   #1 (permalink)
ManleyWilliams is offline Apprentice

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Default thanks,and advice on timming

THANKS for the advice on the MAF sensor i got a new one and it fixed it but now i got to get my timming correct b/c when i sit there and rev it its hard for it to pull 5000 and will sputter but when i drive it down the strip and shift at 5250 it shifts at 5500 but if i try to shift pass 5500 it dies like a rev limmiter or something it has a stock AODE trans
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Old 07-08-2008   #2 (permalink)
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thats about where the AODE wont rev past....it wont happen with the stock computer.

you could maybe get it tuned out but i just went with this..... www.becontrols.com

i can now set my up shifts to high....lol
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Old 07-08-2008   #3 (permalink)
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Default thanks

Good i was hoping it was the computer the 94-95 5sp computer's rev limmiter dont kick in till 7000 is what i've heard my uncle owns a pull-a-part and i can go get one there
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Old 07-08-2008   #4 (permalink)
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Are you swapping to a 5 speed? The car will not behave at all correctly with a T4M0 PCM.

Rev limiter on U4P0 (3.27 gear) and W4H0 (2.73 gear) auto is on at 5450. Stock tachs normally are off by a couple hundred rpms.

A custom chip will let you rev higher although if your valvetrain is mostly stock, I do not think you will pick up any ET by shifting it higher. You will probably just be floating the valves causing damage after a while.

Wes
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Old 07-08-2008   #5 (permalink)
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Quote:
Originally Posted by ManleyWilliams View Post
Good i was hoping it was the computer the 94-95 5sp computer's rev limmiter dont kick in till 7000 is what i've heard my uncle owns a pull-a-part and i can go get one there

hang on here, a auto computer does NOT have a rev limiter...it just tells the tranny when to shift so no need for one. if you have a auto you need to tune the shift point higher or get the stand alone tranny computer like i posted.

a 5 speed computer DOES have a rev limiter and its way lower then 7000 rpm and it wont run your tranny......so again you would need the stand alone unit for the tranny
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Old 07-08-2008   #6 (permalink)
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Quote:
Originally Posted by wayne94mustang View Post
hang on here, a auto computer does NOT have a rev limiter...it just tells the tranny when to shift so no need for one. if you have a auto you need to tune the shift point higher or get the stand alone tranny computer like i posted.

a 5 speed computer DOES have a rev limiter and its way lower then 7000 rpm and it wont run your tranny......so again you would need the stand alone unit for the tranny
Are you sure about all this and can you back it up?

Wes
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Old 07-08-2008   #7 (permalink)
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well i do know for a fact that the auto fox computer im runing in my 94 dont not have a rev limiter and the fox 5speed computer does.

when i was running the stock 94 computer in my 94 you could over rev it but the tranny goes into a ''float'' mode and wont shift till it gets back to the set shift point
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Old 07-08-2008   #8 (permalink)
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Quote:
Originally Posted by wayne94mustang View Post
well i do know for a fact that the auto fox computer im runing in my 94 dont not have a rev limiter and the fox 5speed computer does.

when i was running the stock 94 computer in my 94 you could over rev it but the tranny goes into a ''float'' mode and wont shift till it gets back to the set shift point
That's the rev limiter you are hitting against. You'll see it crop up when someone steps up to a steeper gear. The transmission shift points take a brief moment to mechanically happen once they are electronically commanded. The shift solenoids have to fill with fluid and the actual shift has to take place. When you go to a steeper gear, the car is revving much faster and there is not enough time to pull off the shift before you are in the stock limiter.

Here's a quick screenshot of the RPM limit params on the U4P0 processor (94-95 automatic with 3.27 gear)

ImageShack - Hosting :: 14192587lh4.jpg

There are "on" and "off" values for neutral vs drive, hence the four values you see.

The stock WOT shift points on this PCM are 1-2 @ 4400rpm, 2-3 @ 4900rpm, 3-4 @ 5000rpm.

Notice how when the car is revving faster (the lower gears) the shifts are commanded earlier than in a higher gear?

Wes
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Old 07-08-2008   #9 (permalink)
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Good to see a respectful discussion when there's a difference of opinions.
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Old 07-08-2008   #10 (permalink)
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Quote:
Originally Posted by stanger007 View Post
Are you swapping to a 5 speed? The car will not behave at all correctly with a T4M0 PCM.

Rev limiter on U4P0 (3.27 gear) and W4H0 (2.73 gear) auto is on at 5450. Stock tachs normally are off by a couple hundred rpms.

A custom chip will let you rev higher although if your valvetrain is mostly stock, I do not think you will pick up any ET by shifting it higher. You will probably just be floating the valves causing damage after a while.

Wes
Yea I have a t-5 but i need to get pedals,cables,and what else?,and after i install the 5sp what times should i be running in an 1/8 and a 1/4 the car is completly stock ,stock 2.73 gears, k&n filter,msd blaster coil,8.5mm msd wires, and flomasters with stock cats.
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Old 07-08-2008   #11 (permalink)
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I think you would be doing good to run a 14.7 in the 1/4 on stock tires with those mods. Nothing some tires, gearing and driving practice can't help out with however.

Wes

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Originally Posted by ManleyWilliams View Post
Yea I have a t-5 but i need to get pedals,cables,and what else?,and after i install the 5sp what times should i be running in an 1/8 and a 1/4 the car is completly stock ,stock 2.73 gears, k&n filter,msd blaster coil,8.5mm msd wires, and flomasters with stock cats.
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