Question for your custom bellhousing setup...

Do you think that you could run a stock Miata flywheel/pressure plate with a special disc and use the Miata stock release arm (maybe even the release bearing)?

Im thinking about a tex racing dog engagement transmission because Im thinking of blowing my budget out of the water and this would be one of my "to do" things.

 

When I cut my bell housing, the pivot stud was lost, though I do think you might be able to mount a pivot point to the adapter plate that is welded to bell housing.

 

Thanks for posting the pics of the cut on the A pillar - made the cuts last night - it's starting to look more racey...

I am trying to figure out the cage design. Do you have any detailed pictures of your new cage?

 

Hey Bill,

Just stumbled across this thread. Been away from Miata Turbo forum for a while - never dawned on me that there would be such an extensive thread on an FP Miata.

I have a slightly converted SM (still has top) and a fresh tub on a rotisserie - so we are a long way off from your FP. Car ran as FP back in 05, but Regional Races (SARRC) only here in the SE. Finally getting back to working on my car. Will be asking bookoo questions if you don't mind.

First one echos Lennox60. My tub has no cage at this time. I noticed you went from a half width to full width main hoop. Was this done to reduce the number of bars stuck out in the wind?

Thanks for the detailed posts you've put up!

Henry

 

delete

 

Guys bear with me until the weekend is over, I work all weekend; overnights, I will get some pics of the cage posted up on Monday. Ask away on the questions,I will help you out as much as I can. There is a ton of knowledge on this forum, and quite a few guys that understand how to make a miata handle. I'm sure most would be willing to help a fellow racer out with advice.

As for the cage, yes it was converted to a full width design to minimize surface area and drag.

 

Awesome, thanks!

 

Hey Bill,

On another thread I was asking about the engine in your car, but I don't know if you saw that one. Are you running hydraulic lifters or solids?

 

Running hydraulic, latest generation Jesse Prather Motorsports cams, also running a stepped header with a very nice 4-2-1 collector. No problems turning the engine to 8k.

 

Mr. Bill
thanks for that cam info.

Another question if you please. Are you still running the Stinger ecu the car came with? I'd previously read the whole thread and I thought you had changed to a Haltech along the way. I can't find that specific reference to verify what you've got at the moment.

I've been dicking around with an MS3 and can't seem to get it to work. Back in 05 I ran an AEM that worked well but we've been using MS 1 & 2 products in our shop with good results. I wanted to try the MS3 on the Prod car, but my total lack of progress may force me to have to just bite the bullet and switch my shock/suspension money into a commercial ecu. Do you know anyone in the Prod community that may be running a MS3?

 

Hi Bill -are you going to get a chance to post some pics of your cage and interior?

Thanks,
Len

 

Sorry I have not been on for a while, got the pics just need to upload them. As for ecm, I run a electromotive tec gt, it has been flawless. Jesse did the tune, very drivable on track, but the car does have a hard time at idle, not surprising with big over lap cams and light flywheel.

 

Hi Bill, glad your having fun with my old FP car. Here is my new toy. Because of Mazdas great support it had to be a Mazda.
Chris

 

Chris, The car looks great!! Im sure it is going to be a hoot to drive. Looks like a tub car not tube frame, will that hurt you in gt3 ?

 

Nope, its a tube frame. And I have to add lots of lead as it weighs only 1680lbs. With the 2.3 MZR engine it makes lots of HP also. Its a Riley Grand AM chassis copy so its really torsionally stiff. I'll have no excuse if I don't win races with this one. And for those that are not diehard Mazda fans thats the 787B Lemans winning paint scheme.

 

Wow thats a dinky restrictor after the air filter. Is the restrictor config mandated in the rules or just the diameter? There's some gains to be found over that configuration.

 

The restrictor is called an SIR and caps the HP to around 280. Its 31mm. I was supprised in my first use of one to find they work pretty well. I had one on my old GT2 car that was 37mm and the car put down a stout 320 WHP. Whats suprising about that is that it had the non SIR cams in it that run much more overlap and still made good power. If you look at most Grand Am cars, the open cockpit cars will have them placed just over the drivers head.

 

I understand that. But with good use of geometry you can flow more air through the restrictor than you can a simple restrictor. There could be significant funkyness going on inside the filter and the shinny tube that I'm not seeing though.

 

With an SIR there are bell mouths at both ends that you do not see. And contrary to what you think might make sense, the small diameter is at the entrance and it tapers to some larger size slowly till the exit bellmouth to eliminate any turbulence. I was going to install it backwards at first the first time I installed one. Fluid dynamics is not my strong suit.
Chris

 

Yup, more aggressive taper in, softer taper out. I would have figured bellmouth on the inlet, but no bellmouth on the exit, just take the taper all the way to the diameter of the tube.