Ultimate transmission upgrade for turbo 8's
03-28-2008, 07:39 PM
#52
The Fd bellhousing will fit the Renesis without mods. The only major difference is if you use the Fd bellhousing, you will also have to use the Fd style pull type clutch, slave cylinder, and starter. PPF frame can be eliminated if you were to fab a simple tranny mount (FC style) and diff mount. This is exactly how I have my 20b Fd set-up since I moved the engine back 5 1/2". PPF isn't an absolute neccessity as most people think. Mazda would like everyone to believe it's main job is to tie the whole driveline together while increasing throttle response (which it does). Truthfully all it really does it hold up the tranny's rear end and diff.
03-28-2008, 08:45 PM
#54
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+1 for beefier internals Ray.
I have the same sometimes grinding 2nd gear. I've got 38k on the car, maybe I'll take it in and make a case for a warranty rebuild.
Sounds like Ray is on track for a great long term solution.
I have the same sometimes grinding 2nd gear. I've got 38k on the car, maybe I'll take it in and make a case for a warranty rebuild.
Sounds like Ray is on track for a great long term solution.
04-02-2008, 04:07 PM
#58
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I just sent out a mail to my tranny specialist and I am sure he'll respond tomorrow to the T-56 idea. It's not altogether a new one but I didn't think you guys would be interested in it. I am sure that I will be able to re-visit the idea od upgrading the Aisin but in the meantime we have Evos, STis, and such, to beat and we can't do it with the current Aisin trans. I'll look into developing a whole swap kit and see what is involved.
Hello Charles.
Any news on that t56 tranny kit? If the price you say is so low. I will like to get 3 kits just to start off.
Let me know.
04-02-2008, 04:25 PM
#59
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Buying a T-56 with from most of the aftermarket suppliers allows you to pick your gears for around $3K. Then there's teh bell housing and drive-shaft. Bell housings for rotary/T-56 applications exist, but they're pretty tought to locate. Then you have the mounting issues including shifter placement. There really isn't an inexpensive solution.
04-02-2008, 06:20 PM
#60
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Sounds good. So what kit or what will include in your trany option. From the looks off it.
The hole tranny components will need to be re made out of high grade material.
By doing so, they will need to be straight cut gears keeps the cost down.
So in the end it will cost 6k easy.
So speaking from experience a t56 on the rotary is the best option. Parts are cheap, easy to find. The gearing combinations are endless. 4 differnt shifter locations etc...
Good luck with getting the stock trany beefed up.
The hole tranny components will need to be re made out of high grade material.
By doing so, they will need to be straight cut gears keeps the cost down.
So in the end it will cost 6k easy.
So speaking from experience a t56 on the rotary is the best option. Parts are cheap, easy to find. The gearing combinations are endless. 4 differnt shifter locations etc...
Good luck with getting the stock trany beefed up.
04-02-2008, 07:28 PM
#61
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The next company that sells a kit that will strengthen the stock tranny will make allot of money!!!
My 2nd gear is almost useless now and I am just waiting for a solution to become available.
My 2nd gear is almost useless now and I am just waiting for a solution to become available.
04-03-2008, 10:10 AM
#62
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Start double clutching. You'll get the hang of it.
+1 on the tranny kit. At least enough $ to almost cover costs. Unfortunately, expressed interest in expensive stuff is almost always greater than initial receipts. Over time, though, it'll work out well.
04-03-2008, 07:53 PM
#63
Power!!
04-03-2008, 09:06 PM
#64
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Since were talking about upgrading trans, Does anyone have any ideas or is anyone fabricating a Straght Line Shifter for the RX8 Trans...I know this might be the wrong thread for this , but I'll start a new one if there is anyone out there who has one , who is making one, or etc. Thanks
04-03-2008, 11:28 PM
#65
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Kris, I haven't seem that dichotomy yet between the enthusiasm and the spending, meaning that the people I have delat with have always come through. I appreciate your input and concern. I have written my own opinions about what the outstanding issues may be, collectively, that are causing many of the synchro issues as well.
Can you elaborate a bit more on what your thoughts are as far as upgrading the gearbox. I've heard some other plans recently that are on a shorter timeline. I'll be savings mode for a while either way, but the more info I have to make a decision with, the better. And I'm definitely willing to save a bit longer for a solution I'm comfortable with rather than dropping change early just to fix the issue.
***
The axial flow shifter is great, though I have gotten used to it. Every once in a while I wonder if its really any better than stock. Then I sit in a car with the stock shifter and feel like I'm rowing a boat.
04-04-2008, 09:08 PM
#68
T, the PPF's design purpose was to allow bracing of the tranny and diff while also having as much of the drive line isolated from the chassis as possible. I am not arguing with you, actually, just pointing that out and agreeing that the PPF is something we can eschew in the pursuit of serious power if we want to and plan for it properly.
Your right! I'm just trying to bring up some valid points to those who may want to re-use the PPF and let them know that it can become a major source of problems with increased drive train movement when the engine torque and power is increased. Anyone attempting to re-use one, will most definitely will have to modify or braced it at the tranny.
A couple years back I actually removed mine on my Fd to do a stress twist test on it. I thought it was cracked but it wasn't. Curious as to how much flex there was, I grabbed a couple pry bars and with the help of my father we tried to twist it from each end. I was trying to simulate the engine torquing under hard acceleration. To my amazement, the PPF twisted almost 3" and was very flexible. Now I know that Mazda didn't design the PPF as a torque tube but this twisting is one of the major reasons Fd guys have the 2nd to 3rd gear miss-shifts. When the transmission is allowed to twist too much, it changes (not internally) the angle as to which one would push the gear selector into the normal 3rd gear area. My engine mounts and solid diff mounts were in perfect condition but I would still always miss-shift and my car was basically stock. You could literally see the gear selector torque over. Most FD guys add aftermarket short shifters in hopes to clear up this problem. In most cased it never does.
Anyways, while my PPF was down, I decided to reinforce it. I welded some metal plates on and did a another twist test. My upgraded PPF now wont budge an inch and is rock solid. When I put it back into the car, I was shocked and amazed as to how much better and more solid the shifter felt. I did a couple speed runs and didn't miss shift not once. My modified PPF stayed on my car for about another year till I blew the engine and has no sign of any stress cracking what so ever.
Last edited by T-von; 04-04-2008 at 09:21 PM.
04-09-2008, 08:05 PM
#69
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I have about 25,000KM on my car. How hard do you drive your cars? How long were u boosted before your trannys went? Im going to be installing the Esmeril kit within the next few weeks. Is this a problem I should always be worried about before I put my foot down?
Hopefully BHR can produce something for a reasonable cost. I always just figured the trannys would hold up beside the 2nd gear syncro problem, and that I would just have to worry about the motor
Hopefully BHR can produce something for a reasonable cost. I always just figured the trannys would hold up beside the 2nd gear syncro problem, and that I would just have to worry about the motor
04-09-2008, 09:06 PM
#70
now this makes sense---PLUS---over a year ago i was speaking of how much movement i was seeing on my friends shifters when they were in a high rpm high G turn. Now that people are putting more power down---like i said this makes sense.
were did you weld and how much?
olddragger
were did you weld and how much?
olddragger
04-10-2008, 10:33 AM
#73
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