Pete Pete Remner Infallible Moderator Location: Cleveland, Ohio Join Date: 01/11/2006 Age: Midlife Crisis Posts: 2,022 |
The nice thing about the RX-8 6-speed is the 2-6 ratios are almost identical to the Competition box 1-5. 1st is something like 2.2:1, 4th is 1:1, and usefully short overdrive.
6th gear is the same as early RX-7 5th. The later transmissions had tall 5ths that were somewhat useless and the synchros died more frequently from the big drops, but people wanted to cruise at low RPM for some dumb reason. Wasn't for fuel economy, higher cruise RPM makes economy go up. 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 09/02/2016 01:14PM by Pete. |
mhooper Michael Hooper Mod Moderator Location: Georgia Join Date: 09/08/2006 Age: Midlife Crisis Posts: 65 Rally Car: ae86/gone |
Yea, the ratios were a pleasant suprise. I run 2-5 in my e30 so I'm used to ignoring 1st:-)
4 links... I'm gonna dig through this site and see what I can find... I'm thinking but escort boxes but make my own links... Might be able to ask them to leave the bottom of the box un trimmed.. |
Pete Pete Remner Infallible Moderator Location: Cleveland, Ohio Join Date: 01/11/2006 Age: Midlife Crisis Posts: 2,022 |
You wouldn't do wrong to copy what MRTE apparently did and use the existing lower links (they are roughly 19" long) and use the existing upper link mounts, with lower links, and new upper chassis mounts through the inside of the wheelwells.
Minimize fabrication means maximize time behind the wheel and easier rebuilding after things break. That is why I have bridge port engines instead of peripheral port. Maybe less theoretical power but a LOT less time screwing around because it is a couple hours' porting vs. many more hours fabricating WHEN new parts are needed. On the other hand this is why I like the 3 link, too... I had been going through rearends like beef jerky (or candy, I ain't judgin') and it was simple to make a turret out of 1/8" plate on the new rearend and call it done. But the 3 link is very hard on housings, is probably why I keep splitting them up the middle, which is why I've been building this damn 3 inch for most of the 2016 season instead of driving the car. But at least when it is done it will probably be a brick shithouse and I can focus on all of the transmissions that I also keep breaking... Pete Remner Cleveland, Ohio 1984 RX-7 (rallycross thing) 1978 Silence is golden, but duct tape is silver. Edited 2 time(s). Last edit at 09/02/2016 07:46PM by Pete. |
mhooper Michael Hooper Mod Moderator Location: Georgia Join Date: 09/08/2006 Age: Midlife Crisis Posts: 65 Rally Car: ae86/gone |
. I'm not sure who MRTE is but I'm all over copying if its a good solution... I would give up some performAnce to save on fab time, but not too much... If I buy boxes I think I could get them in and welded up in two days including scratching my head. It is hard to tell where to draw the line.. Ill know more once I mock up an axle and get a wheel in there... Hoping I don't need tubs, dif cutout, for 9.4" with 15" wheels... I know on escorts the goal is to maximize bump travel... Those care even notch and plate the rail to make room for the dif. Don't want to get that involved. Pete, what's this aluminum setup uve mentioned in other posts? You linked it but link was dead. When I search all I get is RC cars. |
mellow65 Oliver Klozoff Godlike Moderator Location: Oregon Join Date: 09/10/2008 Age: Midlife Crisis Posts: 480 Rally Car: Nada |
Just get a 86-95 4x4 toyota axle. I get them from 4 runners, they seem less abused then the trucks versions that I have gotten in the past. I am running one of those full width with some redrilled axles to 5 lug with front rotors from a 2nd gen rx7 in my 83. I just got another one for my next rx7 project, but I'm just going to do a simple 3 link like Havas and Hurst have done in the past. Way easier to do and has been proven to work quite well. "Rally racing makes a heroin addiction look like a vague craving for something salty" |
mhooper Michael Hooper Mod Moderator Location: Georgia Join Date: 09/08/2006 Age: Midlife Crisis Posts: 65 Rally Car: ae86/gone |
Can you explain how this 3 link works? or even better know of any pics/build details on one? II tried google but mostly drag racing stuff from what I can tell. I am pretty near the point where I need to order the 4 link boxes or figure out a different route. Putting FC stuff in the front now, mocked it up today and looks pretty straight forward. Thanks! |
mellow65 Oliver Klozoff Godlike Moderator Location: Oregon Join Date: 09/10/2008 Age: Midlife Crisis Posts: 480 Rally Car: Nada |
Essentially you build a link attachment on the top of the axle in the center and mount the other end to the body. Here are some links with to some pictures and a video. These will give you the basic idea of what's going on. http://www.rx7club.com/1st-generation-specific-1979-1985-18/fb-rear-suspension-geometry-problems-options-solutions-876479/page6/#post10344132 http://www.rx7club.com/1st-generation-specific-1979-1985-18/fb-rear-suspension-geometry-problems-options-solutions-876479/page10/#post10445490 http://www.rx7club.com/1st-generation-specific-1979-1985-18/fb-rear-suspension-geometry-problems-options-solutions-876479/page11/#post11253544 http://www.rx7club.com/1st-generation-specific-1979-1985-18/fb-rear-suspension-geometry-problems-options-solutions-876479/page11/#post11505985 http://www.rx7club.com/1st-generation-specific-1979-1985-18/fb-rear-suspension-geometry-problems-options-solutions-876479/page12/#post11605745 As for a build pics, I have never really found any. Every time I talked to Hurst about it he always told me get the car at ride height and set the top link slightly tipped down towards the front of the car. The FC subframes are a pretty straight forward, there's plenty of info out there about that. "Rally racing makes a heroin addiction look like a vague craving for something salty" |
wvonkessler Wilson von Kessler Senior Moderator Location: Lookout Mountain, GA Join Date: 02/28/2006 Age: Possibly Wise Posts: 1,127 Rally Car: Colts are in Finland; now '87 325i, '89 325i |
Do the 4link!!!
http://www.rx7club.com/build-threads-293/gen-1-rx7-into-tarmac-rally-car-group-c-replica-1040772/ "Talk about drugs. Driving a car like that, going that fast, it’s like all the drugs at once." - Tommy Byrne "Now, Pinky, if by any chance you are captured during this mission, remember you are Gunther Heindriksen from Appenzell. You moved to Grindelwald to drive the cog train to Murren. Can you repeat that?" - The Brain |
wvonkessler Wilson von Kessler Senior Moderator Location: Lookout Mountain, GA Join Date: 02/28/2006 Age: Possibly Wise Posts: 1,127 Rally Car: Colts are in Finland; now '87 325i, '89 325i |
MRT rear suspension pic here: http://www.raclassics.com/copy-of-mazdas
"Talk about drugs. Driving a car like that, going that fast, it’s like all the drugs at once." - Tommy Byrne "Now, Pinky, if by any chance you are captured during this mission, remember you are Gunther Heindriksen from Appenzell. You moved to Grindelwald to drive the cog train to Murren. Can you repeat that?" - The Brain |
mhooper Michael Hooper Mod Moderator Location: Georgia Join Date: 09/08/2006 Age: Midlife Crisis Posts: 65 Rally Car: ae86/gone |
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mhooper Michael Hooper Mod Moderator Location: Georgia Join Date: 09/08/2006 Age: Midlife Crisis Posts: 65 Rally Car: ae86/gone |
wvonkessler Wilson von Kessler Senior Moderator Location: Lookout Mountain, GA Join Date: 02/28/2006 Age: Possibly Wise Posts: 1,127 Rally Car: Colts are in Finland; now '87 325i, '89 325i |
Where'd you score that rubber?
"Talk about drugs. Driving a car like that, going that fast, it’s like all the drugs at once." - Tommy Byrne "Now, Pinky, if by any chance you are captured during this mission, remember you are Gunther Heindriksen from Appenzell. You moved to Grindelwald to drive the cog train to Murren. Can you repeat that?" - The Brain |
john vanlandingham John Vanlandingham Ultra Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Yeah, wonder what size..I's been jonesing for some used 14-62 x 15 Hey Mike! Gonna get those link brackets packed and throw in some shock mounts. I'll email ya later. John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. |
wvonkessler Wilson von Kessler Senior Moderator Location: Lookout Mountain, GA Join Date: 02/28/2006 Age: Possibly Wise Posts: 1,127 Rally Car: Colts are in Finland; now '87 325i, '89 325i |
Why is it that folks focus on the Toyota axles when you can source a Dana 30 axle from a Volvo?
"Talk about drugs. Driving a car like that, going that fast, it’s like all the drugs at once." - Tommy Byrne "Now, Pinky, if by any chance you are captured during this mission, remember you are Gunther Heindriksen from Appenzell. You moved to Grindelwald to drive the cog train to Murren. Can you repeat that?" - The Brain |
john vanlandingham John Vanlandingham Ultra Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Dana 30--staright Dana 30--a 7.2" ring gear is fine to a point.. And as long as Volvo used the Dana 30 OK fine. But at some point in early 80s they had Dana make the pinion a Volvo unique size about the size of a Dana 35 and make the ring gear more or less Dana 44 size--I think they called it "1041 axle" That make the ring and pinion set a unique to Volvo 1041 part and the cost for those sets is in the high $800/ low $900s Fail! Second: no acceptable clutch plate diffs in USA Second.a: worse-er-er you'll never find a diff in the wrecking yard for $50 But only last Saturday I walked a noob thru pulling a Supra IRS diff complete and the boy scored a 8" gearset (4.3) and a LSD for $50 +10 core Now that particular one just happened to be going into his Xratty build, but several boys have done that for their solid axles.. Come on $60 for a BIG strong diff... So the why is: we want alternate ratios for cheap...we want clutch plate diffs for cheap and we always want to upgrade if we can at the same time so upgrades cheap and the Toyota 8" is a bigger and strong diff and housing and bigger axles.. which--if you shop right like several boys have done, for maybe $100 you get a bigger essentially unbreakable axle with THE RIGHT RATIO (4.3 for a ideal turbo ratio or 4.63 or 4.88 for n.a.) for $100.. Come on, mang, zap on a few link tabs and shock mounts already made for $5 each, who wouldn't? Then finally the "third member" is a drop out style---12 bolts and the center section falls on the floor and you work on it in the bench..not build the thing in the axle housing..Gear ratio swps are then easy. Good solid cost effective upgrade for cheap. John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. |