Question for ALL ATX owners (past and present)

[shoguy3.2]

ok guys, i drove my car back to london after a fresh rebuild on the ATX. i notcied something different.......my cars overdrive RPM changed..... tonight i notcied it was about 3100 RPM at 130 kph (80MPH) and before it was rebuilt...i could do 140 kph (85MPH) at 3000 dead on......

i know this may sound stupid but i bumped my car up to 140 kph (85MPH) and it was hovering around 3300...

during the rebuild it got a new torque convertor, upgraded parts, and a aftermartket tranny cooler....

my tranny was slipping when i got the car so im wondering why the RPM change ?? new parts causing this ??

what do you guys run RPM wise...like does my car sound like its acting normal ??

need input guys....thanx

 

[SHeepsclOthing]

What are some of the "upgraded parts"? If could be the torque convertor.

 

[SHOtimer]

Is your torque converter locking up?

Doug

 

[shoguy3.2]

something about upgraded clutch discs i think .....i didnt really read the bill...

and yes the troque covertor is locking up...its brand new...gets overtdrive no problem...just the RPM seems a little higher then usual

what kinda RPMS are you guys looking at with yout ATX ?

 

[MorpheusGPR]

If I remember I will check on my way to work in the morning. I will try to get you an 85 mph reading but might only be 75-80 mph. I have a shimmy I have to work out she wants to shake bad when I really get going.

 

[Broadkil]

me...about 3200 at 90mph....
ill see what my stepdads 91 MTX is getting (just as a point of compareison)

 

[SeanMc]

Seems about right. The "upgrade" could have been going from the 93 trans to the 94-95 trans.

 

[SHOtimer]

something about upgraded clutch discs i think .....i didnt really read the bill...

and yes the troque covertor is locking up...its brand new...gets overtdrive no problem...just the RPM seems a little higher then usual

what kinda RPMS are you guys looking at with yout ATX ?

Just because it is overdrive doesn't mean that your TC is locking up. At 76mph I'm at 2600 - that was the closest I could get.

Doug

 

[The Dude]

Wow...at 70 I'm at about 2800-2900. Whats the deal, I knew my gas milage sucked. When I'm on the highway, around 75-80 I'm over 3000

 

[SHOtimer]

Wow...at 70 I'm at about 2800-2900. Whats the deal, I knew my gas milage sucked. When I'm on the highway, around 75-80 I'm over 3000

Your torque converter is not locking up.

Doug

 

[kurtis adum]

Your torque converter is not locking up.

Doug

how bad is this???? i think that may be me too
kurt

 

[Tommy's SHO]

The cold weather is not letting your torque converter to lock-up. The tranny has to reach a certain temp. before it locks up, that's all.

 

[Axianator]

Just because it is overdrive doesn't mean that your TC is locking up. At 76mph I'm at 2600 - that was the closest I could get.

Agreed with Doug. With stock-sized tires and the converter locked, you should be seeing ~2700 RPMs at an indicated 80mph. If you consistently run higher than this, chances are good that your converter is not locked (or locking).

Initial converter lock-up is determined first by ECT, then by throttle position and speed. If the coolant temperature is to a point to where the converter can lock-up but TP is too high, your converter will not lock. It only takes the converter 0.12v of tip-in for the converter to lock in 3rd or 4th - any more than that and it will unlock due to engine torque demand.

 

[Axianator]

Just because it is overdrive doesn't mean that your TC is locking up. At 76mph I'm at 2600 - that was the closest I could get.

Agreed with Doug. With stock-sized tires and the converter locked, you should be seeing ~2700 RPMs at an indicated 80mph. If you consistently run higher than this, chances are good that your converter is not locked (or locking).

Initial converter lock-up is determined first by ECT, then by throttle position and speed. If the coolant temperature is to a point where lock-up is permitted but TP is too high, your converter will not lock. It only takes 0.12v of tip-in for the EEC to command converter lock in 3rd or 4th - anything much beyond that and it will unlock due to engine torque demand.

 

[SeanMc]

I'll check on my way to work this morning.

 

[SHO#7]

Did they by chance add any monster cooler to the system?

I overcooled one once, and because it never got to normal temps, I never got lock up. I covered part of the cooler and the fluid temp was increased enough for the TFT to let the TC lock up.

Mike

 

[SuperG]

What is the reason for the TC to lock or not lock? How do I know if the TC has locked?

 

[SHO#7]

What is the reason for the TC to lock or not lock? How do I know if the TC has locked?

Lock up is when the clutch inside the torque converter applys. It will happen when in 4th or 3rd ( if OD is locked out ) and at a steady speed with not much force on the go pedal. Its purpose in life is a few things. #1 it eliminates the TC fins ( inside ) from slipping, and lets the transmission cool. There is friction while they are slipping, making heat. # 2 it will increase fuel mileage ( as the transmission and engine are now one on one ratio ) # 3 some will say it makes for a better ride quality. I don't know about that, it is just what I have heard people say.

I good test to see if you have lock up is the following. First you can drive down the road and watch your tach. Count the shifts. 1-2-3-4 and then you will see your tach drop another couple hunderd. That is lock up.

Or while driving at a constant speed. With your right foot on the gas, keeping a steady speed, tap the brake with your left foot. Just enough to light the brake lights. Watch the tach jump up a few hundered. You have just dis-engaged lock up.

Mike

 

[shoguy3.2]

you know when they fixed my SHO...the put a cooler on it ...not monsterous but a fair size one.......oculd that be the reason my RPMS are higher then usual ?? like if i cover part of it ?? you think it would be normal again ?

 

[SHO#7]

you know when they fixed my SHO...the put a cooler on it ...not monsterous but a fair size one.......oculd that be the reason my RPMS are higher then usual ?? like if i cover part of it ?? you think it would be normal again ?

It most likely is because you do not have lock up. Either they messed up and need to do some tweeking to your transmission, or the car does not think the fluid is warm enough for lock up to take place. It may take 15 minutes of driving for the transmission to be warm enough. Have you checked to see if you are getting lock up? Maybe they installed 3.98 gears. That will make your rpm a little different.

Mike