1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

4 spindle to 5 spindle conversion HELP PLS!!

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Old Apr 8, 2010 | 10:34 AM
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4 spindle to 5 spindle conversion HELP PLS!!

Hey everyone,
I want to do a 5 spindle conversion on my 85" RX7. I just need help on trying to figure out other cars; Make and model, that have 5 stud spindles that would fit my 85'.
If anyone has done this type of conversion or has an easier way of converting from a 4 stud to 5 or something in that nature, pls pass down your knowledge...
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Old Apr 8, 2010 | 12:45 PM
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any fc vert or turbo II.. basically any fc with 5 lug vented rear rotors..
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Old Apr 8, 2010 | 09:19 PM
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ReSpeed's big brake kit will make it easier.

http://mrcmfg.com/catalog/product_in...53c08e1c1d41e8
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Old Apr 8, 2010 | 09:20 PM
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Originally Posted by 74rx4
respeed's big brake kit will make it easier.

http://mrcmfg.com/catalog/product_in...53c08e1c1d41e8
+1
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Old Apr 9, 2010 | 11:03 AM
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Hey thanks everybody, but would anybody have an tutorials or images to show??
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Old Apr 9, 2010 | 11:04 AM
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Originally Posted by thunkrd
any fc vert or turbo II.. basically any fc with 5 lug vented rear rotors..
Yo, this sounds pretty good..Did u do a conversion on your 1st gen or not?
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Old Apr 9, 2010 | 02:58 PM
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A search for "Big brake kit" found https://www.rx7club.com/showthread.p...=big+brake+kit
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Old Apr 10, 2010 | 10:21 AM
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Hey thanks a million 74RX4, that thread really helps, and makes everything clear!
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Old Apr 12, 2010 | 10:26 AM
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Hey everyone, thanks for the help! However, when I ask these types of questions, I just don't want only 1 type of answer u know. I want a wide range of options. Some of these options are very helpful, but are very costly. Does anyone know of a cost efficient way of get from 4 spindles/lugspindles to 5 spindles?
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Old Apr 12, 2010 | 04:54 PM
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Unless you have a lathe, mill and time to design your own kit then the re-speed kit is basically the only way to go. Also the re-speed kit only works on the rear if you have an '84-'85 disc rear end, drum rear won't work right now, but I think they're working on a kit for the drum rears.

You might be able to find some wheel spacers that adapt 4 to 5 lug, but I wouldn't recommend using them.
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Old Apr 12, 2010 | 05:18 PM
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Originally Posted by mazdaboy85
Hey everyone, thanks for the help! However, when I ask these types of questions, I just don't want only 1 type of answer u know. I want a wide range of options. Some of these options are very helpful, but are very costly. Does anyone know of a cost efficient way of get from 4 spindles/lugspindles to 5 spindles?
Originally Posted by coldy13
Unless you have a lathe, mill and time to design your own kit then the re-speed kit is basically the only way to go. Also the re-speed kit only works on the rear if you have an '84-'85 disc rear end, drum rear won't work right now, but I think they're working on a kit for the drum rears.

You might be able to find some wheel spacers that adapt 4 to 5 lug, but I wouldn't recommend using them.
This. You have to pay to play. And nothing is too "expensive" on FB's, unless you are buying crazy stuff (Weber carbs/Delloratos/full race coilovers [ReSpeed]), going widebody (DanSYoung or Trochoid) or going racing. If you want to see expensive stuff, lurk (don't post...) in the FD section for about a month. That is where the big boys play.

And why do you want to go with a 5 lug setup? Nice wheels are just as expensive for 5x114.3 as they are for 4x110 or 4x114.3.
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Old Apr 13, 2010 | 02:30 AM
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^^im with you on that one buddy. again search buttons is your friend
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Old Apr 13, 2010 | 09:58 AM
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Okay okay, I c what you mean Whitney85mtu. The only reason why i wanted to go with a 5 lug setup is because I thought it might be easier to find brake discs and pads...I want to upgrade t my brake system to a performance brake setup....If i can do that with a 4 lug setup, that will make a lot easier for me I guess. I'm a noob so pls forgive me for not knowing a whole lot.
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Old Apr 13, 2010 | 11:15 AM
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If its a street car the stock brakes will be fine, just get a set of hawk or carbotech pads and some good rotors. Actually that's what a lot of track cars use too. If you need to upgrade then put on the turbo II brakes with the re-speed kit.
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Old Apr 13, 2010 | 02:31 PM
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Originally Posted by whitey85mtu
This. You have to pay to play. And nothing is too "expensive" on FB's, unless you are buying crazy stuff (Weber carbs/Delloratos/full race coilovers [ReSpeed]), going widebody (DanSYoung or Trochoid) or going racing. If you want to see expensive stuff, lurk (don't post...) in the FD section for about a month. That is where the big boys play.

And why do you want to go with a 5 lug setup? Nice wheels are just as expensive for 5x114.3 as they are for 4x110 or 4x114.3.
I am somewhat insulted by this post. I have owned FCs and FDs when I was a little boy. I am now a big boy and I want a real car with old-school charm. There are plenty of ways to burn money on these cars (20B anyone?). Pretty much any car can be made into a money pit like the jet engine Pinto.

However, you pose a good question, why do you want five lugs? If it is for BBKs for racing, then you are better be ready to have a budget.

As far as the Re-Speed lit goes, you still need axles (which Re-Speed sells all toghether about $700, TII front hubs, front and rear rotors and calipers pads lines etc (I got these for $100 obviously used), rear studs for the axles from Summit Racing ($35).

If that is too much for you, question why you feel you need five studs.
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Old Apr 13, 2010 | 06:32 PM
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alright everyone I will take all these suggestions into consideration...THANKS AGAIN...If i have any more ?s I'll post
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Old Apr 13, 2010 | 11:53 PM
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Originally Posted by mikeric
I am somewhat insulted by this post. I have owned FCs and FDs when I was a little boy. I am now a big boy and I want a real car with old-school charm. There are plenty of ways to burn money on these cars (20B anyone?). Pretty much any car can be made into a money pit like the jet engine Pinto.

However, you pose a good question, why do you want five lugs? If it is for BBKs for racing, then you are better be ready to have a budget.

As far as the Re-Speed lit goes, you still need axles (which Re-Speed sells all toghether about $700, TII front hubs, front and rear rotors and calipers pads lines etc (I got these for $100 obviously used), rear studs for the axles from Summit Racing ($35).

If that is too much for you, question why you feel you need five studs.
I'm well aware that you can spend a ton of money on the FB. DanSYoung and Trochoid have been in the widebody game a long time, which is why I named them, and I just saw your thread where you're building your car up (which, btw, is going to be SICK).
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Old Apr 14, 2010 | 02:01 AM
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More Braking Power

I don't know what kind of driving you propose to do, but I can tell you from experience that the 4 piston aluminum calipers and 11 inch discs from the 2nd gen RX-7 will make a major improvement in your stopping power.

I built a V8 powered FB about 7 years ago, and immediately realized that more braking power would be advisable. I worked with my machinist friend, who also happens to be an automotive engineer, and we figured out how to do the conversion. I spoke with Racing Beat, Mazda Trix and others, and they all told me they had never heard of anyone doing this conversion at that time, so I am pretty sure I was the first to do this. We converted both front and rear brakes, and I posted photos and detailed info on this forum, showing how it was done. I also posted details on my Cardomain page, where it can still be seen.

About a year later, CP Racing offered a kit, which by coincidence looked almost exactly like what we had done. So far as I know, they only offered the front end kit. That offering seemed to fade away, and then Respeed offered a kit. My machinist said "More power to them - I would not make those parts for twice what they are charging. My point is that the Respeed kit is a very good deal for custom made parts, and I have never heard any complaints about their parts, though I have only seen photos.

I am quite happy with the stock 15 inch BBS alloys from the convertible RX-7, but if you prefer the more modern "ricer" look, you can get 17 inch wheels with rubber band tires.
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Old Apr 14, 2010 | 10:09 AM
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Hey everyone, a lot of you ask why I want to upgrade the brake system and change my 4 lug to 5, the reason why I wanted to do so was I thought it would be better. However, from the info I've been hearing from you guys, the stock brakes will accomplish the job...This is really good to hear, as it will save me money and all. I just wanted to see if it was an easy conversion or not. However, since i will keep the stock setup as of now, I want to convert the lug bolt steup to actual lug studs and lug nuts.
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Old Apr 14, 2010 | 12:39 PM
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Originally Posted by mazdaboy85
Hey everyone, a lot of you ask why I want to upgrade the brake system and change my 4 lug to 5, the reason why I wanted to do so was I thought it would be better. However, from the info I've been hearing from you guys, the stock brakes will accomplish the job...This is really good to hear, as it will save me money and all. I just wanted to see if it was an easy conversion or not. However, since i will keep the stock setup as of now, I want to convert the lug bolt steup to actual lug studs and lug nuts.
The only reason why you should need to upgrade your braking system is if you're tracking your car. The biggest weakness in the FB (and any) stock braking system is in the pads. The pads that 99% of cars are equipped with from the factory/aftermarket are designed for low dust/low noise/work while cold. This doesn't allow them to have a heat range that is high enough to allow for spirited driving.

Toss a set of Hawk HPS pads on, some SS lines, make sure your booser/MC are in good shape, and drive it. Short of long track sessions, this should be all that you need.

Also remember that every braking system that has come out in the past 3+ decades has had enough torque to lock all four wheels. This should tell you that your tires are the weakest link for one panic stop, not your brakes. Sticky tires = more braking potential.
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