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APEowner
APEowner HalfDork
7/2/18 10:33 a.m.

One of the guys in my club races a TR6.  He's been racing it for years so it's well sorted.  He does more maintenance and track side repairs than the Miata guys but less than the Formula Ford guys.

Tom1200
Tom1200 HalfDork
7/2/18 8:58 p.m.

Frenchyd, I use the DCOE as an example as they seem to be the ubiquitous choice on most of the cars I see at vintage races. I'm actually not particularly found of them, the Keihin & Mikuni  flat slide flow more and have better throttle response. As for SU carbs prior to my installing the Keihin carbs I had Hitachi SUs on the car and they are as simple to adjust as a carb could ever be.

Circling back to the topic at hand if one plans carefully I think it's possible to have a vintage race that needs little to know maintenance during the season. 

At some point I'd like to try my F500 at vintage races; it's car number three of the first six cars Jay Novak built and has some history. The plan is to use the harder of the two Hooiser compounds and make sure the cooling is overkill. F500s use Rotax snowmobile engines so they must  be kept cool. My approach is make the  car ultra reliable and then add speed.

Bradlee
Bradlee New Reader
7/2/18 10:42 p.m.
NOHOME wrote:

Is there actually a way that a TR6 can be made to corner with the flexi-flier chassis that it came with? I am working on one now. Installing floor panels.  It is not rusty in body or frame, but I swear if I jacked it up right in the middle, and the jack had enough lift, the front and rear tires would meet as it folded in half.

 

I am only half jesting.

 

Pete

Page 54 in the current issue of Classic Motorsports magazine (July 2018) will prove a yes to that question.

Page 164 in the current issue of Grassroots Motorports (August 2018) has the detailed results of the awesome Skidpad Challenge at The Mitty @ Road Atlanta. There were so many cool sports cars galore running. 3rd. overall behind an Exocet on slicks and a tech college formula SAE...on slicks. The crusty old TR6 pulled 1.37g's on 200 tread dot's. Now if autocrossing a technical course was so fun and easy!..ha!

frenchyd
frenchyd SuperDork
7/2/18 10:43 p.m.
Tom1200 said:

Frenchyd, I use the DCOE as an example as they seem to be the ubiquitous choice on most of the cars I see at vintage races. I'm actually not particularly found of them, the Keihin & Mikuni  flat slide flow more and have better throttle response. As for SU carbs prior to my installing the Keihin carbs I had Hitachi SUs on the car and they are as simple to adjust as a carb could ever be.

Circling back to the topic at hand if one plans carefully I think it's possible to have a vintage race that needs little to know maintenance during the season. 

At some point I'd like to try my F500 at vintage races; it's car number three of the first six cars Jay Novak built and has some history. The plan is to use the harder of the two Hooiser compounds and make sure the cooling is overkill. F500s use Rotax snowmobile engines so they must  be kept cool. My approach is make the  car ultra reliable and then add speed.

I used 44IDA’s on my XKE V12  and I was shocked at how little power they made over 2 inch SU’s on the factory manifold.  The reason is the intake tract is so short and the bonnet is right over the carbs. Barely enough room for air cleaners.  I bought the carbs and manifold back in the early 90’s and paid $2300 plus air filters,  throttle linkage  and fuel lines.

I then paid an additional $1100 for various jets air correction meters and venturi’s.  Plus 3 days on the chassis dyno .  Well, not full days.  Every time the air density changed or a serious weather event happened I hauled it to the shop and hooked it up.  During that time I  paid a a fortune in overnight shipping of more jets air and correction meters.  Between dyno time, and shipping  and parts it easily came to over  $1000. 

In the end there was 37 horsepower difference. Now that was 6  two inch SU’s on the fuel injection manifold .  

$4400 for 37 horsepower.  Rob Beere used DCOE’s on a tubular manifold. And made a whole lot more power.  

I wonder How cheap you could buy used slide throttle carbs ? 

My latest idea is to convert the Jaguar EFI manifold into a mechanical fuel injection system using alcohol. 

Tom1200
Tom1200 HalfDork
7/4/18 7:26 p.m.

Frenchyd the Keihin FCR carbs are modular you can go single, connect 2 or connect 4. If you search you can find them for a reasonable price. The Mikuni ones from memory the throttle cable pull the slide up, so when using multiples you add a cable junction box. Several models of snowmobile use flat slide carbs so you could probably find them cheaply on flea bay and the like

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