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Toyota Supra 5sp conversion  Rating:  Rating
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 Posted: 07-26-2005 10:50 am
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Harkes
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in view of my upcoming conversion towards the Toyota Supra W58 5sp (my JH has the 4sp) i was wondering if anyone out there has already gone through this conversion and used the JHPS/Conversion Components conversion kit.

I would love to see pictures and learn about what needs to be done other than modifying the propshaft which in itself is quite tricky enough.

i have a question regarding the conversion kit's tranny mount crossmember: does it mount to the 4sp original tranny mount bolts or does one need to drill new holes? Does it need spacers (i hope not, cause without would be a much better fit)

i saw pictures of Dan's 5sp toyota conversion on http://www.jhppg.com and saw he needed spacers for the tranny mount crossmember. I can't imagine conversion components built and designed the crossmember to use spacers otherwise they would have designed it differently. Can anyone tell if and/or what is wrong there?

i'm still to order the conversion kit but would like to know before hand the work involved.

thanks, Erik, JH 15175 "The Shark", Netherlands

Last edited on 07-26-2005 11:36 am by Harkes

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 Posted: 07-27-2005 06:21 pm
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Dan Collier
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We'll I'm up and running with the new Toyota 5 Speed Transmission. I have many pictures posted in the JHPPG Photo Galley. Toyota Conversion Here's a recap of the events if you are a do-it-yourself mechanic:

1. Find a transmission from a local "Pick Your Part" wrecking yard. I found where I could buy used transmissions for $115 and pay $30-$50 to have them removed from the cars. Normal wrecking yards want more than $650 and offer a 90 day warranty.
2. Order the conversion kit from the club store. Place a second order for the shifter tower extension from Conversion Components. CCwill give you 30 days to return the core or they will charge you a $200 core fee.
3. Pull the old transmission and drive shaft from your car. Nothing will be used from your former JH setup.
4. Split the transmission and install the linkage extension. Inspect all the gears and replace front and rear oil seals.
5. Before mounting the bell housing, look at the clutch fork opening and grind the rear portion of the opening. Without performing this step it could make it difficult to create the 5mm space you need between the throw out bearing and pressure plate.
6. Tap the pilot bushing on the input shaft. Be sure the bushing does not extend further than the tip of the shaft. I had to cut mine by 3/8 of an inch. You could break the bell housing if you don't follow this step.
7. You’ll need a new driveline. The yoke side is common on the Toyota's and the flange side is common on the Nissan's. Part numbers are listed in the gallery.
8. Install the transmission and be prepared to make modifications to the transmission mount. I had to provide hanging bolts from the transmission tunnel to accommodate the new crossmember. Bolt extension tubes were added to get the proper engine/transmission angle. A hole was cut in the crossmember to allow the plunger to extend through the mount. Total length will be 43 1/2 inches from the face of the flang to the end of the yoke.
9. Change the speedo adapter and cable. Connect the reverse light. The stick shaft may come in contact with the rear side of the transmission tunnel. Don't cut it. It's better to tap the edge downwards. Add oil and fire it up.
10. You'll need to modify the stick shifter lever.
 
My disclaimer: I went into this project totally blind. I'm sure there’s better ways to do this project. Please feel free to share your concepts. I will tell you, I hate the transmission mount and will fabricate a well design crossmember in the future. 


Dan Collier
JH74 14381 2.2L
Jensen-Healey Preservation Photo Gallery

Last edited on 08-04-2005 03:07 am by Dan Collier

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 Posted: 07-27-2005 07:51 pm
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Scott Robinson
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Dan,

So how does it drive? Ratios good? Nice RPM drop at higway speeds versus the 4-speed? That's the primary benefit I'm looking for. I have a 2.2 with a 4-speed--and a W58 with the wrong shifter sitting in my closet. Even at that I can expect to spend at least $2000 more to make the conversion. That's a bunch, so I'm sitting on the fence on ordering the kit.

Is the trans mount from Conversion Components poorly designed? The hangers you had to fab make it seem so. What's the deal?

Scott

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 Posted: 07-27-2005 08:26 pm
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Dan Collier
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At the same time I did the Pertronix/MSD conversion. The transmission shifting is smooth and quiet. No second gear pop outs! But right now my timing is 36^ out becasue of the electronic change. It starts within one to two key turns but, I don't have any top end at the moment. Now is when I need dyno to get the maximum horsepower. CC parts were very good except for the bell housing casting. Remember to order the shifter kit if youu decide to start your project.

For the local members, I'll bring my car to the next club meeting and we'll take it for some spins.


Dan Collier
JH74 14381 2.2L
Jensen-Healey Preservation Photo Gallery

Last edited on 08-04-2005 03:10 am by Dan Collier

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 Posted: 07-28-2005 06:59 am
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Harkes
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Scott go for the toyota W58 conversion. You won't regret it.

Dan did a fantastic job. I'm beginning to believe he is the only clubber out there who's done the conversion.. I'm about to start mine and i just hope i can do the job cause looking at the points Dan gave us it is quite a task!! but oh so worth it.

Dan, i didn't mean to critisize your work. Your work is just fab! It is just that i can't get my head around the fact you need those hangers/spacers. I'm sure that this way the line up is perfectly horizontal which it must be, but it's the strange fact that CC came up with such a design. It mount xmember could be easily modified to bridge the gap. I'm thinking about contacting them and ask them if it is meant like this.

i'll keep you posted.

cheers and happy motoring!! i wish i was back on the road yet.

erik

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 Posted: 07-28-2005 03:17 pm
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Dan Collier
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As you can see in this picture Cross Member I had to mount the crossmember in a new location. Note in the picture the Toyota vibrate mount is bolted to the factory location and it's several inches behind the four original studs still hanging down. I wasn't happy having to drill four holes at the base of the transmission tunnel for the carriage bolts to pass though. And note the mount has a moving plunger that CC's crossmember doesn't accommodate. At least the transmission is setting at the correct operating angle to the motor. I know the alignment is correct is because I'm running a fan shroud around the radiator. The fan blade is perfectly in the center and doesn't rub when running. I remember their instruction as saying "Some fabrication is necessary" They weren't kidding.


Dan Collier
JH74 14381 2.2L
Jensen-Healey Preservation Photo Gallery


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 Posted: 08-01-2005 06:12 pm
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Dan Collier
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After adjusting the timing by loosening the timing belt and moving the distributor by three notches, I took the Jensen out for a few spins. I am completely HAPPY! with the results. The transmission is smooth and very quite as I accelerated though all the gears. The real delight was when I shifted to the fifth gear and the motor relaxed to a comfortable level.

Next step in the conversion was to put my center console back and check the shift clearance. This began the next problem area and a modification will be necessary. The forward to rear lever motion is far greater than the original 4 speed lever action. The shifter sleeve diameter of the Toyota takes away even more precious space. I remove the glued on sleeve and found the short shifter still bangs into my cigerrette lighter plate. I'm hoping I can fine one to heat and bend. Toyota Conversion
Update August 4, 2005: Went the the wrecking yard today and pulled a used shifter assembly with the hold down plate. Got all of it for $12.50 plus $2.00 admission.




Dan Collier
JH74 14381 2.2L
Jensen-Healey Preservation Photo Gallery

Last edited on 08-04-2005 11:42 pm by Dan Collier

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 Posted: 08-02-2005 07:49 am
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Harkes
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Hi Dan, looking good!! Are you going to try and bend the lever stick? I think that should work. You seem to have a little room near the dash when in 1st gear, when you bend the lever stick forward it might just clear the sigarette plate..

What is the RPM's when driving around 120KM/hour? (around 72 miles per hour)...i'm hoping it will be around 3500 RPM...

Good luck

erik

Last edited on 08-02-2005 07:54 am by Harkes

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 Posted: 08-09-2005 04:59 am
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Dan Collier
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The Toyota 5 Speed project is coming along really well. I was able to put the shifter lever in a vise and bend the lower portion of the shaft forward by 2 1/2 inches with great success. As you can see in the photos, the lever doesn't come in contact with the forward nor rear positions inside the console. I have the spare shifter out at a local machine shop were they will fabricate a 4 inch steel extension. It will be threaded to the Jensen-Healey shift knob and chromed plated later this week. 

 Forward  Rear Position

Dan Collier
JH74 14381 2.2L
Jensen-Healey Preservation Photo Gallery 

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 Posted: 09-01-2005 01:42 pm
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Ian S
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Hi, when you do the Toyota 5 speed conversion, should you use the 4 speed original back axle or the 5 speed original back axle?

thanks

Ian

 

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