MTX Weakness

[Jesse Menck]

So pretty much everything I've read says the mtx becomes iffy about 350 ft lbs, are we talking crank or tire? If someone were to go through and shotpeen and cryo everything inside possible even the case would it be any stronger? Any thoughts on how much? Can blocking rings and good condition synchros and things of the sort be cryo treated?

 

[luigisho]

It's at the crank. Will it be stronger? Yes but the base material and the design and internal flex of the shaft that holds the gears make it difficult to maintain integrity at those power levels over time. There were some custom HD sets made a while ago but those cost more than the cost of the car. BTW there are many failures at stock power levels when driven hard. Mostly differential pins coming off and cracking or blowing a hole through the case.

 

[Jesse Menck]

I have read all about the diff pins, I've come across a quaifed MTX but have read about people welding them obviously not a Quiafe but do they hold? Didn't I read about someone who made a "snubber" or something to support the input shaft? Do you know any info on that ?

 

[Jesse Menck]

Any idea how slo sho made 500 at the wheels without blow in his shit aPart? Guessin he's one of the ones that got a hd gearset

 

[luigisho]

Josh at SHO Nut performance knows a lot about boosted SHO's and trannys. He had the HD gearset group buy years ago, along with Quaife and Wavetrac group buys. I would try and pick his brain about specifics and I would also track down Tony Huerta from TX-- member texantony. He had done a bunch of SC SHO's at high power levels and munched plenty of transmissions along the way and had (has?) a shop doing installs.

Most of the boosted guys I remember over the years moved on to vehicle platforms that give higher performance or reprioritized their spending.

As for specific members cars, stuff runs together over time so I'd have to go back and refresh specifics. However, a lot of those cars are retired or some of those guys don't visit here much anymore.

But you can track them down via private message or email. If you get good info, post it for future reference.

 

[Jesse Menck]

Thanks for the info I don't wanna go full stupid but 400 crank hp would be awesome

 

[LOUDSHO92]

The weakness for the 350 ftlb is 3rd gear. It is in the middle of the shaft and with the extra power it flexes ot the point that it destroys itself.

As for the diff pin it is not so much as power but just doing burn outs or similiar things.

 

[zoomlater]

At last years convention, Tony mentioned he was looking into doing another run of HD gearsets. I'm sure they won't be cheap.

 

[Jesse Menck]

That's what I've heard, it blows did they really run 5 grand the first go around? And has anyone had all the gears cryod do you kno? Or shotpeening input nd output shaft and if it held any better

 

[luigisho]

shot peen & cryo...Look at yamahasho's old posts. I think he or toolman was doing that kind of stuff a few years ago. The shaft flexes and some people have shimmed it a little to try and limit movement. keep searching it's in here somewhere. unless we lost a lot of it in one of the system crashes

 

[Jesse Menck]

Cool thanks alot guys I know it'd been talked about over nd over, thanks for not gettin on Me too much. I wanna build up my motor basically to the limits of what today's supply for these cars will let me. It's very unfortunate, so many people just hate on these cars aside from being FWD and the trans these things can be rediculous, if only more people believed in em or even knew about em cars 25 years old and I still get people who don't even know what the **** it is or have never been exposed to such a beautiful engine

 

[Banshee]

Yeah man. All the time I get asked what does that stand for? Or wow you don't see these everyday. Casually pop the hood and out comes holy $#_+. Not the fastest things on the road these days stock, but it runs circles around that annoying punk kid down the street with his pos scion.

 

[Jesse Menck]

Lolol yes!

 

[Jesse Menck]

And I just can't stand how many subys I see, even my friends I haven't ran his car but on the bottle I think my car would be close or beat him

 

[Jesse Menck]

To anyone who stumbles upon this thread Yamaha SHO said before he sold he was probably pushing over 500 WHP with a quaifed Shotpeened shimmed MTX, he said dude who shimmed it hasn't had one fail yet though and also said before he sold the car he tried to blow up the trans and couldn't do it!

 

[somedude_001]

I can't speak much on the MTX other than my 1990 MTX track car blew a diff pin and then got a new trans with a quafie and I never had another issue with it (the trans)

I CAN say with certainty that the ATX will reliably hold 8psi on a PT67 and is a absolute blast! 10-17psi and you will replace transmission annually, but you will easily run mid 12' @108 in the quarter... only if it is green with tan interior though

 

[Toolman]

HP is not the concern, TQ is what flexes the input shaft.

Cryo treating and shot- peening, don't waste your money.

Contact Gary Morrell and see if he will shim your trans (he quoted me $3-400 years ago).

Or contact Tony at NTP in D/FW area. Tell him you want an HD gearset. And save up $5000.

Boosting these cars is a blast, but not inexpensive.

 

[somedude_001]

HP is not the concern, TQ is what flexes the input shaft.

Cryo treating and shot- peening, don't waste your money.

Contact Gary Morrell and see if he will shim your trans (he quoted me $3-400 years ago).

Or contact Tony at NTP in D/FW area. Tell him you want an HD gearset. And save up $5000.

Boosting these cars is a blast, but not inexpensive.

I guess one work around if you don't want to get a HD gear set would be a electronic boost controller. Limit the boost until you get into the high revs. Limit the boost limit the fun... This engine can make so much power compared to what I am use to working around. Too bad they didn't continue its development

 

[Jesse Menck]

Thanks for the info tool man l, that is exactly who he said did his. He said he'd try to contact him for me I don't plan on trying to slap this thing in one day but start to piece together over time. Probably on a block that's not the one current in the car. Thanks I or haven't really heard anyone else mention a boost controller can you use one with a vortech?

 

[Toolman]

Honestly, if you are going supercharged, just stay at a reasonable boost level (10-12 psi), and treat your trans kindly, and you will likely not have to worry about gear failures. A vortech setup won't make near the TQ of some turbo setups, but plenty of power to make the car a blast to drive.