The car passed tech and earned compliments from the inspector, whom also is an inspector for Rally America. Seriously chuffed.
The car SERIOUSLY leans out when you hit the secondary jets. The issue - I surmise - is that the chokes are far too big. What parts of the carb do I not have multiples settings for you ask? CHOKES.
So the car is home and I just ordered a set of 42mm and 44mm chokes. Seriously bummed out.
Next hillclimb is in a few weeks, which is hopefully enough time to figure out the carb issue. I'll also be making a plexi bulkhead between me and the radiator and then adding air scoops to the rear hatch.
I don't understand carbs too well....
Don't you wanna add more fuel, not restrict air flow?
Have to maintain enough air velocity to make the jets work. Too big an opening stalls the whole thing.
Read this thread:
http://www.rx7club.com/1st-generation-specific-1979-1985-18/weber-emulsion-tubes-805950/
My car is running F7s and 240 main jets - still lean. It's running 48mm chokes - far too big.
To make sure I had my ducks in a row I also tested the same mains with F11s and F16s and the problem was worse.
In other news - how to cut a clearance hole in your hood.
Step one: remove filter and put screw back in the top. Coat with paint. Lightly close hood so it makes contact:
You now know where the center of the filter stack is and can trace accordingly.
Cut with angle grinder and smooth the edges
Rough airflow got you down? Smooth things out with .030 aluminum
I am having that issue with my carb too :(
Back in the shop after I took a day to clean things up again. Time for a real exhaust!
fidelity101 wrote:
I am having that issue with my carb too :(
If the new chokes don't work I'm going to fill two air corrector jets with JB Weld and drill them out tiny.
DaveEstey wrote:
In other news - how to cut a clearance hole in your hood.
Looks like a race car. :-)
Nearly so.
Tonight the exhaust came out so I can swap in a different transmission. This one doesn't have reverse. Super annoying. I also need to add a muffler to the exhaust for the Burke hillclimb. Fun.
Out with the old and in with the new thanks to some help from my buddy Jeff.
Pretty sure the old transmission is a bit fubar'd. Thinking I'll replace the guts with a Miata gearset.
I didn't think the miata gearset worked in a turbo type trans.
Don't take that as fact. It is just what I assumed based on the differences in trans.
No, you're right. Smoothcase and ribcase transmissions are completely different. The only similarity is that Mazda made both of them, and they usually have five forward gears.
New transmission in and ready to roll. New chokes in. Celebratory braps!
https://youtu.be/AeyI-U_XStE
Tach is too slow...
For some reason I thought you had a stock port!
Oh wow, that tach belongs in the garbage. My "cheapo" Autogage tach responds quickly enough you can practically see individual engine pulses. https://youtu.be/wwZa3Hul6Z0?t=1m21s
Yeah I'm going to call longacre about the tach. Unacceptable.
No stock ports for me! She wont idle under 1,500rpm haha
Got a response from Longacre about the laggy tachometer:
Hi Dave,
Thanks for your email.
Last month we finished our latest version of that tach and the revision was increased response time to get rid of that 1 -1.5 second lag when rev’ing. On the track you probably wouldn’t see the lag because it really only shows itself when you rev the motor like in your video in the shop or the drag race guys have noticed it. At any rate we are happy to exchange it for you for the new style.
When you have a little time between races (2 weeks) give me a call and I will issue you an RMA number to swap it out for the newer version. All you need to do is send it to me (complete w/wiring harness) along with a copy of your purchase receipt and with an RMA# on the outside of the packaging and I will replace free of charge and pay the postage back to you.
Very Best,
Misty Creel
Customer Service Manager
I'm calling that good customer service.
I can't believe that can be defended as "acceptable" for any situation. If you car takes 4 seconds to get to 60 and requires two upshifts to get there, a "1.5 second lag" is the length of time that you're in a given gear!
I'll run it and see if I notice an issue.
What's the pratical mechanical rev limit of the motor? I'd hate for the 'issue' to show up as an over-rev that hurts the motor.
Do rotaries even have a rev limit? lol
