Sequential gearbox for 911 with 3.6 engine ???

[jmz]

Originally Posted by winders

I get a full season out of my 915 and that is with ~430 HP 3.6L bolted to it. What are you doing to your box?

Me personally, Likely shifting faster than I should. It is a Wevo 915 conversion in my 914/6. ~300hp and gobs of torque. It isn't as precise as I'd like it to be and have had some issues with mostly third gear. I think the gearbox had a slightly bent shift rod in it that was causing some issues. That has been remedied. We will see how it goes from here.

[winders]

Yeah, when I get into the heat of battle in a race I sometimes shift faster than I should. The box can handle that as long as, once a year, I get it checked as refreshed as needed.

I am using a JWest Rennshift. I was having some issues with missing the 2nd to 3rd shift and broke a couple of rockers and bent some valves. I made the spring that pushed the shifter from the 1/2 plane to the 3/4 plane stronger and that seems to have solved the issue. I did buy a Wevo GateShift to try and I am still debating installing it....

[Clay Perrine]

Originally Posted by Matt Monson

Who is making an adapter plate and flywheel for that conversion?

I am.

I built the one in my 914. And I don't make a flywheel, I make an adapter for the transmission and pressure plate.



I have not started the production run yet. Covid delayed it big time. But the first prototype is in my 914-6 conversion.

You can see the info here: 914World.com - The largest online 914 community!

Here is a picture of the underside of the car with the engine in it.



Let me know if you have any questions.

Clay

[Geneman]

Clay. THAT IS SCHWEET.! Best of luck getting it into production.

[Geneman]

Scott. In trying to sort this out, I started with Wevo race shifter , then went to the JWest unit... it was not good for me at all(worse than Weave) .. could not find gears in heat of moment. Now trying this CAE unit : https://cae-racing.de/CAE-Ultra-Shifter_3576. which virtually none of my wrenches have experience with ( +big $$$). We will see. it was discouraging when it arrived and I was told they had no installation alignment instructions in English .. had to wait 4 months for them...
Do you have 1st gear synchronized in your 915 box so you can use it on track?

[winders]

Originally Posted by Geneman

Scott. In trying to sort this out, I started with Wevo race shifter , then went to the JWest unit... it was not good for me at all(worse than Weave) .. could not find gears in heat of moment. Now trying this CAE unit : https://cae-racing.de/CAE-Ultra-Shifter_3576. which virtually none of my wrenches have experience with ( +big $$$). We will see. it was discouraging when it arrived and I was told they had no installation alignment instructions in English .. had to wait 4 months for them...
Do you have 1st gear synchronized in your 915 box so you can use it on track?

Only the reverse gear in a 915 has no synchro.

I have what is often called in the racing world an "active" 915. It means that 1st gear is useable at racing speeds. My 915 has a mainshaft with a changeable 1st gear.

If you can't get the Rennshift to work well something is wrong with the 915 or something else in your setup.

If the Wevo nor Rennshift work for you, I don't see how the CAE will........

[Matt Monson]

Originally Posted by Clay Perrine

I am.

I built the one in my 914. And I don't make a flywheel, I make an adapter for the transmission and pressure plate.



I have not started the production run yet. Covid delayed it big time. But the first prototype is in my 914-6 conversion.

You can see the info here: 914World.com - The largest online 914 community!

Here is a picture of the underside of the car with the engine in it.



Let me know if you have any questions.

Clay

Interesting. Can’t say that I’ve seen that approach before.

[Tom '74 911]

Originally Posted by Geneman

Scott. In trying to sort this out, I started with Wevo race shifter , then went to the JWest unit... it was not good for me at all(worse than Weave) .. could not find gears in heat of moment. Now trying this CAE unit : https://cae-racing.de/CAE-Ultra-Shifter_3576. which virtually none of my wrenches have experience with ( +big $$$). We will see. it was discouraging when it arrived and I was told they had no installation alignment instructions in English .. had to wait 4 months for them...
Do you have 1st gear synchronized in your 915 box so you can use it on track?

Originally Posted by winders

Only the reverse gear in a 915 has no synchro.

I have what is often called in the racing world an "active" 915. It means that 1st gear is useable at racing speeds. My 915 has a mainshaft with a changeable 1st gear.

If you can't get the Rennshift to work well something is wrong with the 915 or something else in your setup.

If the Wevo nor Rennshift work for you, I don't see how the CAE will........

One more data point... My race car (SPEC 911) came to me with a Wevo shifter. I had been using a Seine Systems gate shift kit in my '74 911 (street/track) that I really liked, but was excited to try the Wevo, mostly due to the seemingly universal love that it gets. I found that I do not like the Wevo... at all. I did a lot of adjusting, spring swapping and even rebuilt the whole thing w/a bunch of new parts from Wevo but I could just not get along with it. I didn't like the feel and found it hard at times, to find gears. I finally gave up on the Wevo and bought a Rennshift for my race car... LOVE IT. I can't tell you what the mechanical differences are between the two, but the Rennshift just agrees with me - enough so that I bought a second one for my '74 to replace the Seine Systems kit.

This is all just one person's experience... I'm happy that there are so many options for us to chose from!

Best,
Tom

[Gabe.]

Am I the only one interested in seeing a PDK swapped into an aircooled? That could be a much cheaper alternative to a sequential.

[Matt Monson]

Originally Posted by Gabe.

Am I the only one interested in seeing a PDK swapped into an aircooled? That could be a much cheaper alternative to a sequential.

Just gearbox to gearbox, on something like a Cayman, the PDK gearbox weighs 67 lbs more (256 vs 189). For reference, a 914 gearbox is 119 lbs, so either gearbox is increasing your car's weight.

A sequential is lighter than an equivalent street car gearbox. And there's no electronics or ecu. If someone has a motec, they can integrate a sequential into it, but you can 100% run a sequential strictly mechanically, and many do.

As is often the case in motorsports, the lighter a thing is, the more it costs.

[chrisbalich]

Originally Posted by Matt Monson

Just gearbox to gearbox, on something like a Cayman, the PDK gearbox weighs 67 lbs more (256 vs 189). For reference, a 914 gearbox is 119 lbs, so either gearbox is increasing your car's weight.

A sequential is lighter than an equivalent street car gearbox. And there's no electronics or ecu. If someone has a motec, they can integrate a sequential into it, but you can 100% run a sequential strictly mechanically, and many do.

As is often the case in motorsports, the lighter a thing is, the more it costs.

Matt, I feel like you really need a street car to beta-test that fancy new sequential you're developing. Something that will be driven in the rain and to the grocery store as well as on more spirited adventures.

***I'm also working on convincing my Mrs that I really need a sequential...for science.

[Matt Monson]

Originally Posted by chrisbalich

Matt, I feel like you really need a street car to beta-test that fancy new sequential you're developing. Something that will be driven in the rain and to the grocery store as well as on more spirited adventures.

***I'm also working on convincing my Mrs that I really need a sequential...for science.

That's exactly what we did with the Cayman in my signature. This is what's in the trunk...



If any of you have followed the Blasphemy build that Mike O'Neil is doing, that's my adapter kit he's using. It mates a G96 or G87 gearbox to a Subaru Ej engine. I would love to put this Cayman sequential into a 914 with a Subaru, but I'm not building any projects right now. Maybe next year once things are more normal.

[chrisbalich]

Originally Posted by Matt Monson

That's exactly what we did with the Cayman in my signature. This is what's in the trunk...



If any of you have followed the Blasphemy build that Mike O'Neil is doing, that's my adapter kit he's using. It mates a G96 or G87 gearbox to a Subaru Ej engine. I would love to put this Cayman sequential into a 914 with a Subaru, but I'm not building any projects right now. Maybe next year once things are more normal.

Right on!
(I was hinting that I would volunteer for those DD beta-testing duties. )

[Matt Monson]

Originally Posted by chrisbalich

Right on!
(I was hinting that I would volunteer for those DD beta-testing duties. )

I know. I play dumb a lot.

[Geneman]

Yes Matt. .. of course..: beta test... " For Science!!" and remember. I am the card-carrying scientist ... Plus.. I will sequence your genome FOR FREE! send it my way....

seriously. I hope you get that developed

[aus911]

Hi Mario,
Albins in Australia make the sequential transmissions for the V8 supercar series here in Australia, they also make various other transaxles. They list a lot of gears etc for Porsche transmissions.
May be worth a look. albins.com.au

Cheers
Ray

[Clay Perrine]

Originally Posted by Matt Monson

Just gearbox to gearbox, on something like a Cayman, the PDK gearbox weighs 67 lbs more (256 vs 189). For reference, a 914 gearbox is 119 lbs, so either gearbox is increasing your car's weight.

A sequential is lighter than an equivalent street car gearbox. And there's no electronics or ecu. If someone has a motec, they can integrate a sequential into it, but you can 100% run a sequential strictly mechanically, and many do.

As is often the case in motorsports, the lighter a thing is, the more it costs.

I thought about a PDK for my car. Then I started researching it. It won't be any easier to install, you still have to have an adapter for the engine and flywheel, and you still have to install a single shift cable for it. But you also have to have some kind of electronic controller to send the CAN bus signals to the trans for the upshift/downshift functions, and a tach/vehicle speed sensor to tell it when to automatically upshift. Another thing is the PDK is about 7K or more to buy one, the G86-21 is about 4K.

So for cost reasons, and for simplicity, I went with the 6-speed.

Plus.. I like to row the gears when driving.

Clay

[faapgar]

Love these posts.If you have a good trans guy you can change the brake bands for the synchros to travel only 1.5-2.0 teeth instead of 3.5 teeth for synchro hookup.I have been doing this for 35 years.Only for my customers though.Never had a web site or want for more money.Hint is use a brake band from a later car and trim an earlier brake band for shorter travel.I no longer have a shop so I will share.Sometimes I have frustration to read these posts.I shared this knowledge with Grady.He enjoyed.The only problem is you need a driver who knows how to drive.Ciao Fred

[Geneman]

Fred that is cooler than snot..... something I have never heard on these pages. maybe you wanna visit my shop....

[chrisbalich]

Originally Posted by faapgar

Love these posts.If you have a good trans guy you can change the brake bands for the synchros to travel only 1.5-2.0 teeth instead of 3.5 teeth for synchro hookup.I have been doing this for 35 years.Only for my customers though.Never had a web site or want for more money.Hint is use a brake band from a later car and trim an earlier brake band for shorter travel.I no longer have a shop so I will share.Sometimes I have frustration to read these posts.I shared this knowledge with Grady.He enjoyed.The only problem is you need a driver who knows how to drive.Ciao Fred

Fred,
That's all news to me about modifying the synchros to quicken the shifts.
PA isn't all that far from IN if you still have tools and can find some time...