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Rx-7 Rally Car v3.0!

Posted by Gravity Fed 
Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Re: Rx-7 Rally Car v3.0!
December 02, 2016 11:19AM
Been studying 12 hours a day for exams next week.


The angle of the engine is concerning because the more I look at the angle of the transmission, the more I'm worried about driveshaft clearance. I can probably re position the motor in a good, long day. I'm also not convinced I like how i mounted the transmission either. I'm going to drink tea and give it a good hard stare after final exams.



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egdinger
Eric Dinger
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Re: Rx-7 Rally Car v3.0!
December 02, 2016 03:47PM
Quote
john vanlandingham
Quote
Gravity Fed
3. I need to resolve the fuel issues to make it compliant with RA and NASA. Who the hell knows what nonsense ARA will add but not a problem at the moment. Anyway, NASA states may second "spare" pump needs to be mechanically separated. AJ point out that moving a switch IS a mechanical process, but the letter of the law disagrees. So i ll have to replumb things with a valve at the pumps.

3. da fuq you on about? Chapter and verse again?

Quote
GRR Section 3.25.6 Secondary Fuel Pumps
The fitting of a second fuel pump is authorized, but this must be only
a spare fuel pump, i.e. it cannot operate in addition to the authorized
pump. It must be connectable by means of a purely mechanical
device situated beside the pumps.

It would be hard to argue for the switch with "PURELY MECHANICAL" in there.

I can't find anything about not allowing lexan side-windows to roll down though.



Edited 1 time(s). Last edit at 12/02/2016 03:52PM by egdinger.
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Mad Matt F
Matt Follett
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Re: Rx-7 Rally Car v3.0!
December 02, 2016 05:38PM
My guess is somebody wants a mechanical shut off valve... so you can't flick a switch and have both pumps running...which would do what??? Send more fuel back to the tank... sounds weird.

Hey it means when your pump dies you get to get out on stage, put a triangle, flick a switch, get your triangle....

winking smiley

Edit... really by the word it just needs to be connected by a mechanical device, doesn't say what is to be connected... Mount the pump on a door hinge... and wait for a wording change.



Edited 1 time(s). Last edit at 12/02/2016 05:40PM by Mad Matt F.
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Gravity Fed
Alex Staidle
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Rally Car:
1978 Mazda Rx7



Re: Rx-7 Rally Car v3.0!
December 04, 2016 12:09PM
yea just seems silly to have to go through all that nonsense to turn a back up pump on.



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Pete
Pete Remner
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Re: Rx-7 Rally Car v3.0!
December 04, 2016 01:56PM
Quote
Mad Matt F
My guess is somebody wants a mechanical shut off valve... so you can't flick a switch and have both pumps running...which would do what??? Send more fuel back to the tank... sounds weird.

Fuel pump A overheats and craps out, switch to fuel pump B, which also overheats and craps out because the hot fuel in the tank is what is making it overheat, so switch BOTH of them on so maybe crap plus crap equals enough.

Anyway, about that Subaru brake booster. How much screwing around was required to get it in the car? Swap the clevis and adjust some brake lines and Bob's your uncle, or was firewall surgery required?

I'm asking for a friend who just picked up an '81 with a rusted through brake booster.



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.



Edited 1 time(s). Last edit at 12/04/2016 01:59PM by Pete.
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Mad Matt F
Matt Follett
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Re: Rx-7 Rally Car v3.0!
December 04, 2016 02:11PM
I get why you would want 2 pumps running. My question is what performance advantage would it give that you would want to regulate it? Isn't the amount of fuel dependant on the injectors and the pressure? Are fuel pump outputs regulated in anything but production???

Just seems like a silly rule...
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Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Re: Rx-7 Rally Car v3.0!
December 04, 2016 03:58PM
i agree on silly ruling.


Pete, it was pretty easy honestly. I did use the GSLSE booster spacer to get the distance from the pedal about right, and I needed to widdle down the threaded part of the rod to the clevis like 2mm to adjust back enough.



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Gravity Fed
Alex Staidle
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Re: Rx-7 Rally Car v3.0!
February 15, 2017 11:13PM
photos seem crappier than expected, but this should give an idea the droop in the front.



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mekilljoydammit
Daniel DeRosia
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Re: Rx-7 Rally Car v3.0!
February 16, 2017 11:47AM
That's sexy as all hell.
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Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Re: Rx-7 Rally Car v3.0!
February 16, 2017 02:48PM
I just hope it drives sexy.



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Pete
Pete Remner
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Re: Rx-7 Rally Car v3.0!
February 17, 2017 08:35PM
Hey, you're alive!



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.
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john vanlandingham
John Vanlandingham
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Re: Rx-7 Rally Car v3.0!
February 17, 2017 08:37PM
Quote
Pete
Hey, you're alive!

If living in Stockton can be called that....Pooor Alex.



John Vanlandingham
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Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Re: Rx-7 Rally Car v3.0!
February 21, 2017 09:43PM
Quote
Pete
Hey, you're alive!

seems so!

Working on my doctorate so I generally find myself doing that instead of the important things, like racing.

That said I really hope to get this car done here before summer. At least in terms of driving about. Really want to feel how this suspension works now that I've functionally de-Mazdaed the back half.

Still rallycrossing Pete?



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Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Re: Rx-7 Rally Car v3.0!
April 03, 2017 08:28PM
SO

where is a good place to get a Toyota 8" LSD rebuild kit?

spinning smiley sticking its tongue out



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Eric Ewert
Eric Ewert
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Re: Rx-7 Rally Car v3.0!
April 03, 2017 09:27PM
I think this is what you are after...

http://weirperformance.com/maxgriplsdkits.html
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