Interesting. What's the theory/science behind using such a device?

 

^^^^^^^^^

+1


sounds like that would be useful for autox or road racing, not drag racing...

 

just checked the speedfactory site. that part seems interesting. it ELIMINATES 1-2-1 and 2-3-2 shifts. looks like a legit part. well worth the $ tho. good investment

 

here's the info from speedfactory

SpeedFactory (SF)-Modified Shift Change Holder Assembly for B-series hydraulic transmissions!

1st off, what is the SCHA, and what does it do? The SCHA is located inside the transmission housing, and is the internal mechanism that actually moves the shift forks into position, engaging each gear as it is selected.

Why do you need this? Because you can't finish a race with a broken gearset or the inability to get it into gear due to a damaged SCHA. Because yours is wearing out and bending, and you want to get to it BEFORE it breaks and you ruin a transmission and gear set, especially if you're running a dogbox and big power. This also works great with stock transmissions and will help improve shifting, especially the 2-3 shift. Just push the shifter forward, and it will automatically drop into 3rd gear! It pulls the shifter to the center position with authority, to help eliminate the dreaded 1-2-1 or 2-3-2 mis-shift!

We've made improvements and fixed the parts that break so that you can make better and more consistent shifts, lower your ET's, and save your transmission! The SF-Modified SCHA is a vital component of a reliable transmission, and replacing it BEFORE it fails will save you money and frustration in the long run.



We have seen a number of people experiencing problems with missed shifts and/or damaging expensive dogs and syncro teeth, and having difficulty finding the cause of these issues. We have experienced these issues as well in our Outlaw Civic while running the PPG Dogbox. In search of the cause and a solution, we worked closely with Bullhead Gears. They shared data gathered regarding these issues from other racers across the U.S., and we were able to identify the cause of these issues, find a solution, and implement it in the best way possible while keeping costs reasonable. Basically, this product was designed to address the serious need for a stronger, improved SCHA in these transmissions.

We here at SpeedFactory have spent many hours locating the cause of these issues when they occur in a properly assembled transmission through careful inspection and testing. The stock SCHA has been indentified as the source of these "mystery" issues in most cases. The problem areas of the stock SCHA have been identified and we have modified/replaced these parts accordingly, and tested this modified SCHA in our 1100whp Outlaw Civic with great success, as it has eliminated all issues that we had previously experienced.

There are actually 7 different modifications made to the SCHA.

The stock shift change arm is the biggest weak link. The stock arms are made of poor quality stamped steel, and are often damaged (stress cracked or bent). This piece has been replaced with a heavy-duty CNC machined tool steel arm that will not bend or break like it's stock counterpart. A damaged stock arm often goes unnoticed as the damage can be difficult to spot without disassembling the SCHA and/or checking for proper operation of the internal components through assembly and testing utilizing a windowed transmission case. Many people have damaged part after part and experienced issues shifting without realizing that a damaged shift change arm is to blame. Then, replacing it with another stock unit has resulted in the same problem occuring again, usually within a short period of time.

The interlock piece is prone to wear and bending as well, which negatively affects the operation of the SCHA and can result in increased difficulty shifting. This piece has been braced as well as bracing the SCHA itself to create a much stronger assembly that offers more precise, improved shift action and will hold up under the abuse seen during aggressive shifting such as when used in a drag racing application.

In addition to these modifications, the shift select return spring has been upgraded with a much higher tension unit. This gives the shifter a more positive feel, and returns the shifter to the center position with authority. This allows for much easier 2-3 shifts as well as greatly reducing the chances of the dreaded 1-2-1 or 2-3-2 mis-shift, and does not require solid engine mounts to work.

Saving even one missed shift, damage to a dog ring or gear, or reducing damage to a syncro sleeve or the dog teeth on the gear itself is worth it alone. Not to mention a lost race due to a transmission that doesn't want to or won't go into a gear because of a damaged SCHA. The easier 2-3 shift and reduced chance of a 1-2-1 or 2-3-2 mis-shift is a great benefit as well. 　

This upgraded assembly is great for those who want to make sure each shift engages as it should, especially under racing conditions, or for anyone desiring a better functioning gearbox with greatly improved reliability!

 

i know a guy who runs this and he says anycar he works on has to have this part on it its a must. he says little things like this help for a more successful pass

 

you installing yourself?

 

nah my tuner knows trannys so he's gonna install it

 

That info about the shift change holder is very interesting. I have experienced failures in these in a personal car of mine, what a pain.... I never knew this upgraded SF part existed, I think Ill look into one

 

glad it could help

 

BUMP UPDATES DOIN BUILD NOW.....NICE BUILD BRO

 

Just read this whole thread, many props on an awesome build. I'm trying to gather info for my ls build. Please though, punctuation is your friend

 

lol srry i didn't pay attention in class.

 

 

m factory cuff

 

 

got my motor mounts finally bottem end is going in this weekend

 

Just got through reading.

So as far as daily driving and what not....what do you like more...LS or LS/Vtec?

Sick build man im subbed

 

well the ls i drove for a while and it was real nice on the street with dr. the ls vtec had a crazy kick when vtec popped it was just a lot more aggressive then the ls but didnt get to drive it much maybe 3 times lol it was also nicer to rev a lot higher then the ls. if it was a dd i would keep the ls non vtec

 

Nice project, do appreciate posting many pictures.


That clutch combo is syck, I bet cost pretty penny.

 

BALLIN CUZ....Dropin sum cash to flow into it...nice build

 

got my ge 84mm hg today should have motor finshed in the car ready to start by the end of this weekend just need a turbo now

 

Love the build It is inspiring me to do mine faster lol. So far i got pnp head supertech springs and retainers crower 404s and crower ss valves. Sleeved B18b with 10.5:1 comp and a gt35r. Hoping for 500+whp

 

nice think u can make more then 500 what fuel setup u got

 

Right now I have walbro 255. Thats all I have for now, but the plans are aeromotive regulator aem fuel rail and rc 750cc injectors. Its pretty much the same setup my brother has on his 500hp b16. All tuned by Hondata s300

 

The only thing I am worried about is how well the 404s will spool that big turbo. Im not much of a fan of the 32r so if I cant spool the 35r I will probably switch to a t60 .82ar Its about the same size as the 32r. I know its hard for my bros car to even spool the t60 with gsr cams so it makes me a little bit worried. Only tying it will tell tho