MAX ATX rpm's??

['94SHO]

So, I have a Ted B. lpm installed... In "D", I have the normal 7,000 rpm limit.
In nuetral, or park, I have no limiter.. Also found out that in 1-2 I have no limiter.. How many trips to 7300-8000 before I blow my new alternator?
I don't do it often, or for more than a second or two.. Just enough to win. ??

 

[hawkeye18]

I'd say more than about 5 and the alternator's done for. I would try finding a set of UDPs to alleviate that problem.

 

[AREA 91]

What mods do you have done to your ATX SHO? If you have very few, there's no reason to rev it that high. It's fun, but you aren't making any power up there. You may actually go slower!

 

[rubydist]

What mods do you have done to your ATX SHO? If you have very few, there's no reason to rev it that high. It's fun, but you aren't making any power up there. You may actually go slower!

I have to disagree with that assessment, for the case of 1st and 2nd as 94SHO has said he uses it. Here are the relevant torque curves for the 3.0 (I can't find the same curves for the atx right now, but they are similar, especially from 1st to 2nd):

Its pretty clear to me that running the engine past 7000 in first and second (on the mtx) will result in additional torque to the drive wheels, even though the engine torque is falling at that point. As I said, while I don't have the curves for the atx, I know that the same situation applies at least to the first-second shift on the atx. (Edit: Thanks to shotimes for the curves.)

 

[hawkeye18]

The 3.0 makes 2,000 lb/ft of torque in first? Hot damn.

I have my redline set to 7500 simply because when it shifts into second, it shifts right at 4250 RPM, which is the sweet spot for second... or any gear, really. Does it make much power? Not really... not past 7000, but by that time the tach is going so fast it's really not a big deal. Plus, the engine sounds HELLA cool at 7500-8000 RPM! It's funny to watch mustang d00ds (who shift at 5500) look over weird when I keep going in first for another 3 seconds... all soundin' like an F1 motor 'n stuff...

 

[SeanMc]

When I start getting aggressive in the turns, it'll bounce off the rev limiter until I'm out of that turn. Nothing like going 55 in 1st in the corners and the tach bouncing, and right when you come out, it shifts and you take off.

 

[Yamaha V6]

My 95 ATX:

 

['94SHO]

Well....

I know it's not good to rev too high, but my T.C. locks at 6800 rpm's or so.
So if I rev to 7,300, the real fun does not last long. I wish my T.C. locked sooner, when it locks, I can get (light) wheelspin in second gear no problem.
The L.P.M. gives a nice firm 1-2-3, but it seems that it REALLY hooks up and
sometimes even spins the tires again when the T.C. locks up.
My alternator is brand new, so if it goes, I will just return it for a new one.
So, is 7,300-7,500 safe for an ATX?? I never keep it there for long.
Not auto crossing or anything like that.

 

[hawkeye18]

7500 shouldn't be too much of a problem for the ATX. As long as you don't spin the tires the ATX is usually fine. Spinning the tires is what blows the differential, though...

 

[0V3RC10CK3D]

Why don't you just get UDP's and not worry about it? And yea, don't spin the wheels, roll it for a second before you push the go fast pedal through the floorboard.

 

[hawkeye18]

Or learn the correct amount of brake-torquing. The correct amount will give you an amazing launch, with no bog and no spinnage. The right tires are a big part of that, though!

 

[Yamaha V6]

One note, look how quickly things fall off for the ATX over 7,000 rpms. Essentially, with such a wide / flat curve, shifting at 6,800 / 7,000 tops is going to keep you in the powerband, so why worry about taking it to the moon?

UDPs are fine & all, but if you have a thumping stereo, keep in mind UDPs aren't likely to be very friendly in that area.

 

[SeanMc]

I keep my idle rpms at 1100 (cams and what not as well), but yes, if you don't have a tuner, are cammed, have a thumpy stereo, expect your battery to drain quickly.

 

[AREA 91]

One note, look how quickly things fall off for the ATX over 7,000 rpms. Essentially, with such a wide / flat curve, shifting at 6,800 / 7,000 tops is going to keep you in the powerband, so why worry about taking it to the moon?

This statement above is what I was getting at.

 

[1993MTXSHO]

if you want ATX UDP I believe jon93 or 93jon has some for sale, lemme go find his user name for you.

 

[revhardSHO]

The cam profile for ATX SHOs is slightly soft on the high end of the powerband, so your torque is falling off faster than an MTX.

 

[rubydist]

One note, look how quickly things fall off for the ATX over 7,000 rpms. Essentially, with such a wide / flat curve, shifting at 6,800 / 7,000 tops is going to keep you in the powerband, so why worry about taking it to the moon?

Even with the way the torque curve falls at the high rpms, there is still more torque to the wheels if you run it to 7500 rpm v. shifting at 7000.

Is it a lot of difference? No, but sometimes you're looking for just that little bit more...

 

[SeanMc]

The cam profile for ATX SHOs is slightly soft on the high end of the powerband, so your torque is falling off faster than an MTX.

Yup, very soft. Stage 2s woke it up amazingly.

 

['94SHO]

Udp's!!!

Yep, I know I need udp's, I wsish I could just change my T.C. to get it to hook
up better BELOW 7,000! hahaha. Strangest thing, before 6500-6800, it gains
ground well, but a tenth of a second before "redline", it grabs HARD, and then
last 5-600 rpm's pull SO much harder, almost like the timing is advanced at that point.... THAT is why I am worried about the "redline", all the fun happens over
6,000 rpm's.. Do they make a "switch pitch" T.C. for the SHO? Does anyone
make a (driver) lockable T.C.? If I could only get it to grab like that ALL the
time.... Sigh. Oh, BTW, I don't make a habit of spinning the tires, just that sometimes a
WOT 1-2 shift can haze the tires briefly, or a hard 3-2 downshift.. When I launch, I use just
enough throttle to get moving without just spinning my wheels. I hardly ever go from a dig.

 

[1993MTXSHO]

for the UDP his name is jon93, sorry i forgot to look i got distracted lol