4k shutoff

Topic: 4k shutoff (Read 5054 times) previous topic - next topic

Reply #30 – May 27, 2009, 01:40:37 PM

true, didn't think about that. will have to check it again going down the road.

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Reply #31 – June 06, 2009, 08:41:50 PM

turned 4200rpm in drive today.

anyone want to do the math? 1:1 drive ratio with 2.73 rear and 215/60-15's

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Reply #32 – June 06, 2009, 09:01:39 PM

Right around 110mph, in a fox t-bird/cougar, it feels a hell of a lot faster than it actually is.....in order to go 160 with that car, you'd have to turn just a little over 6,000rpm...that's not happening.

4k shutoff

Reply #33 – June 07, 2009, 08:49:42 AM

Gotta remember your converter will be slipping at wide open throttle, too, (it won't lockb up at WOT) so you're not quite at 1:1

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Reply #34 – June 07, 2009, 11:32:13 AM

Quote from: Thunder Chicken;276263

Gotta remember your converter will be slipping at wide open throttle, too, (it won't lockb up at WOT) so you're not quite at 1:1

True but on a AOD 3rd & O/D are driven from the inner shaft that's splined into the front hub of the converter... Ford says something about it being 60% lockup in 3rd and full in O/D... All I know is there is almost no increase in rpm from converter flash when you hammer it in 3rd...

Still the only way that car is going to run 160, is maybe off a cliff(a tall one)...

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Reply #35 – June 07, 2009, 02:48:52 PM

i never claimed 160 that i recall

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Reply #36 – June 07, 2009, 02:49:09 PM

although my brothers 88 stang WILL run 160

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Reply #37 – June 07, 2009, 04:18:21 PM

Quote from: Dougy_Fresh;276297

i never claimed 160 that i recall

Quote from: TurboCoupe50;273877

Well I'm calling BULL shiznit on this... Six miles of stop/go & 45 mph averaged into 19 miles would probably mean you'd have to be running 150-160mph the for the 19mi... AS I SAID, BULL shiznit...

As far as prev turning 6500 another BS, the computer limits RPMs to 6250... Ain't happinin' with STOCK ford valve springs anyway...

Wanna try another story???

In a round about way, you surely did...

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Reply #38 – June 07, 2009, 07:14:14 PM

all i know is when i left and when i arrived. i left my friends house and made it to Advance Auto in 12 minutes. i left at 7:35 and arrived at 7:47. yahoo maps says it's a 23 miles, so it's not quite as far as i thought and maybe there was a little less of the 45mph section. i was without a doubt turning 4000rpms in OD until i lost OD about a mile from Advance Auto.

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Reply #39 – June 07, 2009, 07:34:25 PM

anyways, back to the subject at hand, i found out that it started doing this when the previous owner installed an HO upper, TB/spacer, mustang headers, and 19# injectors.

i have ruled out vacuum leaks, so i think it has to be the injectors. will 19# injectors cause this?

i'm about to finish out my HO conversion, have a friend giving me a SD HO computer, just gota get a cam and heads. i have heard that the heads don't make much of a difference, is this true? i would rather just get it running good for now because i'm buying an explorer engine soon and dont want to waste money on e7's

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Reply #40 – June 07, 2009, 09:27:08 PM

You will kill someone driving that fast. I have driven alot faster then anyone ever should in these cars. After blowing out a couple of 15 year old tires, I have really calmed down. You will too, or you would get so lucky and it will end itself.

Even since I got married and had a kid, I rarely even go 5mph over.

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Reply #41 – June 07, 2009, 09:46:42 PM

Quote from: Dougy_Fresh;276327

i was without a doubt turning 4000rpms in OD until i lost OD about a mile from Advance Auto.

Absolutely not, that's 158mph...and the fact you can NOT go full throttle in OD...it'll downshift to 3rd. The standard output will NOT pull 4k rpm against an aerodynamic wall in OD...it'd be hard to do it in 3rd. You probably lost 3rd & 4th gears, which is quite common with AOD's. SO makes peak power at 3200rpm...turning anything more than 3800-4000 is a waste.

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Reply #42 – June 07, 2009, 09:57:28 PM

19# injectors on a SD computer that's calibrated for 14# injectors will certainly cause a rich condition. Whether it'd cause your cutout is a different matter (it certainly wouldn't help), but I still say it's just your lo-po SO 5.0 running out of air. Their power peak, like Sick88 said, is 3200 RPM, so the power will drop off after that and will fall off rapidly at 4000 RPM because the engine just can't move enough air. Remember, 4500 RPM is the (pathetically low) redline of these lumps.

With all else being HO parts (cam, intake, TB, injectors, computer, headers, exhaust) the E7 heads would probably be worth anywhere between 15-25 horsepower. The '86 HO used E6 heads and only made 200 horsepower, while the '87 used E7's and made 225. Not all of that power difference is from the E7 heads though - the '87 also had a larger TB and true dual exhaust with H-pipe, while I believe the '86 Mustang had single exhaust and a slightly smaller throttle body...

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Reply #43 – June 07, 2009, 11:09:19 PM

Quote from: Sick88Tbird;276357

Absolutely not, that's 158mph...and the fact you can NOT go full throttle in OD...it'll downshift to 3rd. The standard output will NOT pull 4k rpm against an aerodynamic wall in OD...it'd be hard to do it in 3rd. You probably lost 3rd & 4th gears, which is quite common with AOD's. SO makes peak power at 3200rpm...turning anything more than 3800-4000 is a waste.

i do not have to go WOT to turn 4000rpms, not even 3/4.

this car HAS turned 6500rpm, my brother used to own it and i have personally seen it do it. granted it was in first gear.

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Reply #44 – June 07, 2009, 11:19:26 PM

Your tach's off, Ford EEC cut the fuel at 6250, it ain't going higher period unless you have a chip to increase the rev limiter... There ain't no maybe about the fuel cut, it's just like you turned off the ign sw...