rev limiter

[RdRunnr]

Originally posted by gtsr515
But yet your 1st responce to my input was that I "obviously don't have any experience in tuning" and "I've never been up against the rev limiter", can't wait to see the Ford part number on that 7300 rpm limited EEC.

I just sent Byron an email for the processor code. I will post it when he sends it back. Again, I am try to share my experience and I am not looking to argue.

[RdRunnr]

I just looked it up on the EEC board and the 95 GT T4MO processor revs up to 7000 from the factory. So that is good news to 94-95 owners, but doesn't help 87-93 cars.

[RPM427]

Why would Ford set the limiter to 7300???? They are all limited the same. I once missed a shift and burried the tach, that proves how off the stock tach is.

[RdRunnr]

Here is the coding from that particular EEC for limiter:

PIP 833 # Minimum PIP period. (PIP = 6250000/maxRPM)

6250000 / 833 = 7500.

I received all this info from the guys on at the EEC Tuner forum. You can join the group at: http://groups.yahoo.com/group/EECTuner/

[Stroked408]

I have never been behind the wheel of one so I am not sure about this,but didn't Ford designed some type of input into the 94-95 V8 5-speed computers to pull timing under full throttle powershifting,to protect the tranny? I knew a guy that had a 94 and this is what he told me,I have never heard of such a thing but I am curious if nayone else has heard this lie?

[RdRunnr]

Pro-Flow sells the "pih" kit for 94-95 Mustangs which replaces their computers with an 87-93 computer. Here is their claim:

- Convert your 94/95 Mustang to an earlier computer
- Removed 6-8 degree spark retard feature built into newer computers
- 0.5-0.7 1/4 mile time reduction
- On/Off switch
- LED lights indicate power on, low speed, and high speed fan operation

A few of my friends run this kit, and they said the picked up about .4 in the 1/4. They also like it because it has a low and high speed fan control setting.

[srv1]

Originally posted by RPM427
Why would Ford set the limiter to 7300???? They are all limited the same. I once missed a shift and burried the tach, that proves how off the stock tach is.

so RPM, your saying my tach is off by 1000 or 1200 rpms?(estimating by me going past the 7k mark) that much? see, i would buy aftermarket tach, but i want mine in the factory location and i dont want an aluminum insert with the Autometer gauges. i want to leave it stock. i wonder if anyone calibrates them? i have a place that calibrated speedos that is only an hour from my house. i wonder if they would do tachs.

another thing. with all the aftermarket products for the 87-93, why didnt someone make an aftermarket OEM type tach?

[Stroked408]

Oh man this must be good Friday,that is one of the best suggestions no one ever came up with answer or easy fix.

I do not understand why the factory tach is off that much but it sure is,and my wake up call was watching the two together.

I do not know what happens as far as what is pulled either spark or fuel,but I think at that rpm you are hurting the valvetrain anyway,yeah I know cars leave on the 2-step all the time but they are only on the 2-step for .400 so no comparison there.

[RPM427]

I'm not saying the stock tach is off by 1200 rpm all the time, I'm saying when the engine goes to 2000 to 7000 in about .4 seconds, the tach probably just had some inertia and carried through past the 7k mark. But I when I am at the track, the tach seems "lazy" and is clearly not accurate. It just seems slow, the higher your RPM and the faster you accerate the engine (accerating the car or missing a shift), the more inaccurate the stock tack will be. I bracket race an have a hard time shifting at the same RPM because of the stock tach.
Need an Autometer! For the street the stock tack is fine, but if you want to get very consistent track times, you need an aftermarket tach.

Autometer make tachs in a huge selection of sizes, you can make one fit with some patience. Check out thier site:

http://www.autometer.com/hp/index.html

[LX5liter]

Originally posted by Stroked408
I have never been behind the wheel of one so I am not sure about this,but didn't Ford designed some type of input into the 94-95 V8 5-speed computers to pull timing under full throttle powershifting,to protect the tranny? I knew a guy that had a 94 and this is what he told me,I have never heard of such a thing but I am curious if nayone else has heard this lie?

I believe that was only on automatic cars to provide a smoother transition between gears, and I think it was at any speed and throttle position, not just WOT.I could be wrong on this though.

[srv1]

RPM. i know about the Autometers, but do not in any way want to do anything to hurt my dash or cluster. meaning drilling or anything else. but yeah,the Autometer is the way to go for accuracy.

[RdRunnr]

I just found out that the A3M1 factory EEC-IV for 93 and factory replacement 5.0L mustang 5spd also goes above 6250. The Rev limit is at 7000RPM instead of 6250 because PIP filter is 700 instead of 961 like the others.