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RX7 Rally Build

Posted by steevano61 
steevano61
steven warren
Junior Moderator
Location: olympia WA
Join Date: 11/27/2012
Age: Possibly Wise
Posts: 45

Rally Car:
1979 RX 7


RX7 Rally Build
August 01, 2014 08:29PM
I have never gotten stage rally's or rotary's out of my blood since I ran my first rally, the 1979 Olympus in my first rotary a RX3sp. When the opportunity presented itself to purchase Ben W's "Fling Pu" RX7 I couldnt resist. Its been 20+ years since I've played with the triangles so I'm looking for advice on set up. It currently has a street port 13b but I will be building another motor over the winter. I have a Weber Side-Draft set-up and a Holley 600, is there anyone with experience that can point out the pro's and cons? Also, is there any reason to go with bridge porting on the new motor vs. street porting, I dont plan on winning any championships and am more interested in longevity than hp.
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Alex Staidle
Mega Moderator
Location: Δx = ħ/2Δp
Join Date: 08/21/2009
Posts: 1,676

Rally Car:
1978 Mazda Rx7



Re: RX7 Rally Build
August 01, 2014 11:29PM
i have suggestions as a fellow rotary rally guy.



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steevano61
steven warren
Junior Moderator
Location: olympia WA
Join Date: 11/27/2012
Age: Possibly Wise
Posts: 45

Rally Car:
1979 RX 7


Re: RX7 Rally Build
August 02, 2014 01:03AM
I'd love to hear any advice you have. I see you organize and co-drive too... I was on the Olympus Committee from '80-'88 the pre and WRC days, and also competed as a driver. I have since switched to the silly seat but that may change back since I bought this. I rejoined the Olympus committee a few years back but after starting up, organizing and putting on a SCCA Rally Cross series here in WA by myself and still co-driving I stepped back from Olympus this year. You can check out my FB page and Warren Rally Sport on FB to see what I've been up to and that I'm not full of BS. This car has huge potential, Ben did a great job when he built it and I still cant believe he contacted me and offered to sell it. Its been sitting for 3 years so I have some work to do but all in all its a very solid rally car.
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Alex Staidle
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Location: Δx = ħ/2Δp
Join Date: 08/21/2009
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Rally Car:
1978 Mazda Rx7



Re: RX7 Rally Build
August 02, 2014 09:54AM
the biggest question is, what 13b is it? GSL-SE? or is it from an 86-91?



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steevano61
steven warren
Junior Moderator
Location: olympia WA
Join Date: 11/27/2012
Age: Possibly Wise
Posts: 45

Rally Car:
1979 RX 7


Re: RX7 Rally Build
August 02, 2014 12:44PM
I was out of a 1st gen RX7, I can try and find out what year if that would help. I got it running this morning but the accel pump is toast so I'm looking for an A/P for a Nikki, looks like I wont get it until Tues. I was told that the syncro's are bad in 2nd on the tranny so I'm also looking for another 5sp trans if know of one. This was originally Leon Styles car but the chassis was retired and this is basically the guts of that car on a new seam welded, custom built chassis.
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Pete
Pete Remner
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Location: Cleveland, Ohio
Join Date: 01/11/2006
Age: Settling Down
Posts: 1,927


Re: RX7 Rally Build
August 02, 2014 04:24PM
Bridge vs. street - longevity is the same, longevity is divided by RPM and time and both engines if built right will make peak power at 8500-9500rpm. Bridge ports have a broader powerband and more of it, while I haven't had a street port that did much useful below 5500 and then it would come on like a light switch.

I don't bother with street ports anymore. My car has a bridge port slightly bigger than what was in the Mazda Group A homologation paperwork (looks exactly like what is sold by Racing Beat/Mazdatrix as a template, too...) and the exhaust is a fair bit bigger. It's what I use to putt around to work, to the grocery store, to r00st at rallycross, etc. Current engine has something like 32k miles on it and is due for a freshening, but this is also what I would get out of street ports too.





Mind you I have EFI. EFI cures almost all drivability sins, if you care about that sort of thing.



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.
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steevano61
steven warren
Junior Moderator
Location: olympia WA
Join Date: 11/27/2012
Age: Possibly Wise
Posts: 45

Rally Car:
1979 RX 7


Re: RX7 Rally Build
August 02, 2014 07:52PM
enduro cross? I just did a test session on something like that. I let the cars run for 10 minutes (I had 2 courses set up roughly .7 miles each) on 1 course, had them work cones and then let them run the second course. Also, just spoke with the previous owner and the motor is an early 70's 4 port motor out of a RX3 or p/u and not a GSL-SE 6 port.

\



Edited 1 time(s). Last edit at 08/02/2014 08:39PM by steevano61.
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john vanlandingham
John Vanlandingham
Mega Moderator
Location: Ford Asylum, Sleezattle, WA
Join Date: 12/20/2005
Age: Ancient
Posts: 13,998

Rally Car:
Saab 96 V4



Re: RX7 Rally Build
August 02, 2014 08:45PM
Quote
steevano61
I was out of a 1st gen RX7, I can try and find out what year if that would help. I got it running this morning but the accel pump is toast so I'm looking for an A/P for a Nikki, looks like I wont get it until Tues. I was told that the syncro's are bad in 2nd on the tranny so I'm also looking for another 5sp trans if know of one. This was originally Leon Styles car but the chassis was retired and this is basically the guts of that car on a new seam welded, custom built chassis.

Steve, you do know that back in the day Millen's car that he drove so beautifully was basically a Maz-dog shell and a Wankie-----and everything else was Ford Escort, dontcha?
Crossmember, rack, arms, hubs, brakes, gearbox, axle, struts and whole Group 4 rear end 9towers and loooooooong links...

THAT seems to be the way to make a RX7 go...if the motor runs, fine (I'd go Weber since you have both and those Holleys don't seem to like sloshing around for the flame outs I've seen guys have who are fixated on them).

Second Gen crossmember and rack/hubs brakes is real easy to cram in...To to Alex...He's done it twice.



John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

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CALL +1 206 431-9696
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steevano61
steven warren
Junior Moderator
Location: olympia WA
Join Date: 11/27/2012
Age: Possibly Wise
Posts: 45

Rally Car:
1979 RX 7


Re: RX7 Rally Build
August 02, 2014 09:05PM
Yeah, very familiar with Roddy's set up. Looks like Miata gear is the latest thing. Rod and John Woolf were the reason I got into rally, a ride on a press stage for '78 Olympus and my RX3sp was caged (jerry hines), tokiko susp (rod and john gifts), safari seats and switches (Nagel) and misc parts from friends in the GT3 series and rally ready in 2 weeks. Being the poor old bastard I am I think I can find some fun for a reasonable cost with this thing. The car was Leon Styles old car that has been rechassis'd that he first ran at Rim of the World. In all honesty, probably wont do much more than run my RX's and Sprints but we'll see (I'm not the sharpest tool in the shed).
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Pete
Pete Remner
Professional Moderator
Location: Cleveland, Ohio
Join Date: 01/11/2006
Age: Settling Down
Posts: 1,927


Re: RX7 Rally Build
August 02, 2014 10:36PM
Miata? From looking, the Miata rails are narrower and a lot higher up. When I bolted the FC subframe into my car, I did just that. Bolted it in. Just had to make a couple stands for the rear subframe bracket and it was in. Bip bang done, move on to the next problem. Bolting the struts in was simply mixing and matching out of the Mazda parts bin - Escort ZX2 strut tops work just fine if you drill the strut tower out for 10mm studs. (Later, I fabricated new struts out of Subaru bits. The ears are the same thickness but the bolts are spaced an inch or so further apart, simple to deal with)

You can 4 link, I like 3 link because it's faster to fabricate since the lower links aren't horrible. Six of one, half a dozen of the other. When you bolt the Sportage front pumpkin into the rearend for a $100 set of 4.78 gears, you can make a brace for the Watts pivot that goes over to the Kia part's mounting hole.



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 08/02/2014 10:37PM by Pete.
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Alex Staidle
Mega Moderator
Location: Δx = ħ/2Δp
Join Date: 08/21/2009
Posts: 1,676

Rally Car:
1978 Mazda Rx7



Re: RX7 Rally Build
August 03, 2014 11:36AM
or you can go too far and never finish like I have...

http://www.rallyanarchy.com/phorum/read.php?5,93878



Respecognize!
Http://www.facebook.com/2WDriveRally
First Rally: 2010 First RallyX: 2004 (a bunch)
Driver (0), Co-Driver (5)
Organizer (3), Volunteer (3)
Cars Built (1.5), Engines Blown (2) Cages Built (0) # of rotations (3.5)
Last Updated, Oct 30, 2013
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Pete
Pete Remner
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Location: Cleveland, Ohio
Join Date: 01/11/2006
Age: Settling Down
Posts: 1,927


Re: RX7 Rally Build
August 03, 2014 12:04PM
yah, I realized a while back that I like driving more than wrenching, so I spend my not-wrenching time thinking about how to make the wrenching parts go as fast as possible so I can get that over with and go back to driving.



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.
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Alex Staidle
Mega Moderator
Location: Δx = ħ/2Δp
Join Date: 08/21/2009
Posts: 1,676

Rally Car:
1978 Mazda Rx7



Re: RX7 Rally Build
August 03, 2014 12:08PM
yea im going into "screw it, make it work" mode



Respecognize!
Http://www.facebook.com/2WDriveRally
First Rally: 2010 First RallyX: 2004 (a bunch)
Driver (0), Co-Driver (5)
Organizer (3), Volunteer (3)
Cars Built (1.5), Engines Blown (2) Cages Built (0) # of rotations (3.5)
Last Updated, Oct 30, 2013
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A1337STI
Alex Rademacher
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Location: Reno,nv
Join Date: 09/10/2007
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Posts: 684

Rally Car:
93 GC with an 01 RS swap!


Re: RX7 Rally Build
August 05, 2014 03:42PM
love it. smiling smiley

one of my "tricks" for hard to diagnose car problems is to ignore and drive it really hard until the problem becomes more apparent. its usually dumb and more expensive, but so cathartic .
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