Typhoon maxing out at 110 mph

[thewumpus99]

I tried to figure out the max speed of my '92 Typhoon yesterday, and it was pretty disappointing. I got to 110 mph, at which point the engine just kinda hung there in the 5,000-6,000 rpm range and didn't want to give me any additional acceleration power to get to 120.

Basic performance rundown: 122k miles, just got it so not sure if the engine was ever rebuilt (we'll assume not), chipped with the ATR Pitbull so there shouldn't be any governor, previous owner gutted the AC to run the turbo piping, took off the catalytic converter. New spark plug cables & iridium plugs. Tranny definitely not ever rebuilt, and so nearing the end of its useful life.

Any idea what's going on here? Max speed on a stock Typhoon, even an old one, should be higher than 110 mph, right? (My '92 Jeep could reliably run up against the 115 mph governor even at 180k!)

 

[Jimmy]

Re: Typhoon maxing out at 110 mph

It didn't shift into 4th gear. :2cents:

 

[thewumpus99]

Re: Typhoon maxing out at 110 mph

Is that more likely a transmission problem, or more likely a control problem? I do often get the yellow Check Engine light at highway speeds; maybe that is related to the problem. I've got an ALDL cable on order, so we'll see what that turns up.

 

[midnightbluS10]

Re: Typhoon maxing out at 110 mph

Is that more likely a transmission problem, or more likely a control problem? I do often get the yellow Check Engine light at highway speeds; maybe that is related to the problem. I've got an ALDL cable on order, so we'll see what that turns up.

All you need is a paperclip to pull CEL codes. Just be sure that you do not start the truck while the paperclip is in the ALDL connector.

http://www.sportmachines.com/maintenance/aldl.php

 

[Jimmy]

Re: Typhoon maxing out at 110 mph

Is that more likely a transmission problem, or more likely a control problem? I do often get the yellow Check Engine light at highway speeds; maybe that is related to the problem. I've got an ALDL cable on order, so we'll see what that turns up.

IMO it is normal for a stock trans.They just don't like the WOT 3-4.

Now there may be some that will do it.but I have never seen one. (Damn why was it raining when I inspected Junior1's Ty rant: :tdown: :rant: )

 

[dgoodhue]

Re: Typhoon maxing out at 110 mph

IMO it is normal for a stock trans.They just don't like the WOT 3-4.

Now there may be some that will do it.but I have never seen one. (Damn why was it raining when I inspected Junior1's Ty rant: :tdown: :rant: )

I have had good luck manually doing the 3-4 shift on SyTy that wouldn't do the 3-4 shift if otherwise just left in OD.

 

[jjorgensen52]

Re: Typhoon maxing out at 110 mph

My truck will do 100 in 3rd with the converter unlocked (I think it's about had it) , so I'm in the boat with Jimmy.... I also used to have a 3-4 shift difficulty, but after doing a heavy duty rebuild it seems to have gone away

 

[Zewerr]

Re: Typhoon maxing out at 110 mph

I know my truck has had the trans replaced at about 50k miles by the original owner (who was a GMC tech). Somehow, supposively he did it under warranty (I guess he had some kind of extended warranty). So my transmission should be stock. My entire drivetrain is stock. But at WOT, my truck shifts into 4th at about 90-95 mph.