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

Look what I bought! Dual Webers!

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Old 02-05-07, 11:41 AM
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Wankle Waffles

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Look what I bought! Dual Webers!

http://cgi.ebay.com/ebaymotors/ws/eB...5629&rd=1&rd=1

I'm just glad it went for under $500. The reserve was $400. I just need to scrape a little bit of money together so I'm not so screwed due to buying this. (shameless plug: https://www.rx7club.com/showthread.php?t=620907)

So the list of things to do when I get it are:
-Rebuild the Carbs (anyone know where to get a kit and a manual?)
-Recharge the K&N filters (they look like they're still pretty damn good)
-Wait until the weather gets nice to install and tune
-Oh and I need a new fuel pump

So who's jealous? Orrrr who's going to tell me I could've done better?
Old 02-05-07, 11:45 AM
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MattG FTW!!!!!

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Good job, those look like they will be awesome!!! Make sure to keep us updated on them, and how they work out for ya

-Matt

Last edited by MattG; 02-05-07 at 11:49 AM. Reason: Lame joke
Old 02-05-07, 11:47 AM
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Right on, I like weber carbs and would like to have them on my 7 eventually. Count me in for being jelous!
Old 02-05-07, 11:55 AM
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Call these guys up for the kits, its where I bought mine- http://www.piercemanifolds.com/

Here are pics of when I rebuilt mine, http://frosted7.com/katrina32.html, they may or may not help you out. Made such a huge difference after being rebuilt, and retuned in sync. You'll definately be happy with them! I'll be getting rid of mine this summer on ebay though, but if you need help or advice tuning, pm me.
Old 02-05-07, 12:03 PM
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You can count me as somewhat jealous. The dual weber setup is something I'd like to have. I bet it would really perk up my mildly ported 12A versus the stock nikki.
Getting the RE header in the deal is just too cool. I'd rather have that header than the RB one I recently scored for $100.
Old 02-05-07, 12:25 PM
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Originally Posted by Rogue_Wulff
You can count me as somewhat jealous. The dual weber setup is something I'd like to have. I bet it would really perk up my mildly ported 12A versus the stock nikki.
Getting the RE header in the deal is just too cool. I'd rather have that header than the RB one I recently scored for $100.
Yeah, I love the RE headers. The equal length helps out a little bit. I'm surprised I already have two and only one RX-7. I'm such a part *****.

I think Trochoid is using one of the Dual Weber setups he has for his 1/2 Bridgeport. So these things must be pretty damn cool.

Hooray for American Rotary Tuning! Rotary Engineering.
Old 02-05-07, 01:01 PM
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Great grab! You'll like 'em I havent heard of people making as much power as you would with a side draft, but drive ability is supposed to be much better if you get it tuned right. Good grab you'll be happy with it.

Last edited by Hyper4mance2k; 02-05-07 at 01:25 PM.
Old 02-05-07, 01:20 PM
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tuning is the suck... you are going to a have to keep then in sink.. and every 1 knows carbs change with the weathers now you have 2 of them to keep up with..truning to keep them both tuned the same it will be a weekley thing for you to be messin with thos carbs...but the plus side is they look fan-damn-tab-u-less... and will make your car run perfect when tuned its lots of work but worth it gr8 buy
Old 02-05-07, 01:26 PM
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Yeah, the dual weber down draft setup is very dependable on the street, once it's tuned correctly. The side draft setups are better for the track though, where the RPM's are normally kept in a much higher range. They just lack the low-end of a nikki or dual weber progressive 2bbl.
Sterling has said repeatedly that the rotary needs a small primary/large secondary carb setup for best performance throughout the RPM range. Hard to beat the dual webers.
I dunno if Trochoid has one of these duallies or not. I know he was recently looking for one, though.
Old 02-05-07, 02:17 PM
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Originally Posted by darkfrost
Call these guys up for the kits, its where I bought mine- http://www.piercemanifolds.com/

Here are pics of when I rebuilt mine, http://frosted7.com/katrina32.html, they may or may not help you out. Made such a huge difference after being rebuilt, and retuned in sync. You'll definately be happy with them! I'll be getting rid of mine this summer on ebay though, but if you need help or advice tuning, pm me.

What are you going to put on the car after you take those off?

Also about how much was each rebuild kit? Ive been meaning to rebuild mine when i find the time & money.
Old 02-05-07, 02:24 PM
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I was watching that auction with a close eye. I don't have that much money unfortunatly.

VERY nice buy sir. I try to keep my eye out for those setups as they are great.
Old 02-05-07, 02:38 PM
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nice find. duel carbs is a little too intimidating to me though. i bought a weber on ebay in november too. 48idf with Rotary Engineering manifold. im scared to hell about rebuilding it. btw would darkfrost rebuild guide work with the 48idf i got?
Old 02-05-07, 02:48 PM
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Originally Posted by Rx Seven
What are you going to put on the car after you take those off?

Also about how much was each rebuild kit? Ive been meaning to rebuild mine when i find the time & money.
I'm working on rebuilding a 13BT to be run off a megasquirt, as well as some other goodies. I'm away from home right now, but once I get back that will be going in, and the dual webers will be sold off.

Originally Posted by woodonastick
nice find. duel carbs is a little too intimidating to me though. i bought a weber on ebay in november too. 48idf with Rotary Engineering manifold. im scared to hell about rebuilding it. btw would darkfrost rebuild guide work with the 48idf i got?
I'm not sure how similiar it would be, the 36DCD is the first carb I've ever taken apart. I was terrified at first, but it was relatively straightforward as long as you stay organized and don't lose anything. I have the Haynes Weber manual, in my opinion the instructions were terrible, but the diagrams in there were a huge help.
Old 02-05-07, 08:14 PM
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I bought 2 complete setups after looking for over 18 months. One for a 12A, the other for a 13B. I just about have one set up ready to install on the widebody, waiting for some warmer weather as all of my inside space is filled atm.

I did take one set apart for cleaning, being very careful to preserve the gaskets. They are much simpler inside than I expected. Tuning should be fun as I swapped the 13B carbs to the 12A mani and not a single jet or tube has an identification # on them.

I was watching that auction also and noticed that some parts for the linkage may be missing. If you need pics when you get your's, let me and I will take a few. The intake mani looks great after powdercoating it in a mettalic silver.

Hopefully these will solve my lack of size that I have with the Mikuni.
Old 02-05-07, 08:20 PM
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I also was watching. If i would have got my tax return back I would have bid on them. Instead my tax return is going twards new tie rods on the GS and maybe a MSD box.
Old 02-05-07, 08:50 PM
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Hit up CB Performance for parts and tech stuff they have pretty good prices and they're absolutely the best when it comes to support/customer service

www.cbperformance.com
Old 02-05-07, 08:59 PM
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I remember those when they first came out. Rotary Engineering claimed 152 hp with their exhaust system and the twin webbers.

Many years ago I walked by a set in the salvage yard laying in the dirt with the chrome breathers tops still attached.
Old 02-06-07, 12:45 AM
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Nice find. I just bought a dual weber setup myself... it was a little more expensive but it came with the rest of the car already attached

The drivability is great. Combined with the header it's almost like driving a stock car except it makes twice as much power. And, the 36DCD is just about the easiest carb there is to fiddle with. Supposedly they are a little more high maintenance but it's not hard at all.

Can't believe someone would throw away a perfectly good set of 36DCD. If nothing else the carbs themselves would fetch some money on eBay since you can't get them new any more and there are lots of cars still running them (stock on lots of european stuff in the 60s).
Old 02-06-07, 12:02 PM
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Originally Posted by trochoid
I bought 2 complete setups after looking for over 18 months. One for a 12A, the other for a 13B. I just about have one set up ready to install on the widebody, waiting for some warmer weather as all of my inside space is filled atm.

I did take one set apart for cleaning, being very careful to preserve the gaskets. They are much simpler inside than I expected. Tuning should be fun as I swapped the 13B carbs to the 12A mani and not a single jet or tube has an identification # on them.

I was watching that auction also and noticed that some parts for the linkage may be missing. If you need pics when you get your's, let me and I will take a few. The intake mani looks great after powdercoating it in a mettalic silver.

Hopefully these will solve my lack of size that I have with the Mikuni.
The auction said some parts of one of the linkages might be missing, but I figure that's just a blow I'll have to take in order to get these now.

I'm kinda excited and giddy that my little silver fb will have the same carb setup as the famous black widebody.
Old 02-06-07, 11:51 PM
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Welcome to a world of suck and fail most known by the VW group.
Old 02-07-07, 10:14 AM
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Originally Posted by fcdrifter13
Welcome to a world of suck and fail most known by the VW group.

Expansion of that thought process would be a wonderful thing to persue.

(Need more details)
Old 02-07-07, 01:01 PM
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just ask a VW guy what it's like trying to keep 2 DCD's in tune. It's horribly difficult.
Old 02-07-07, 01:18 PM
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Originally Posted by Hyper4mance2k
just ask a VW guy what it's like trying to keep 2 DCD's in tune. It's horribly difficult.

But, when they work. . . . . its what everyone wants to run.
Old 02-07-07, 03:48 PM
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Honestly, its not all that hard. I used a pair of narrow band a/f gauges, put a sensor in each pipe of the header, and that allowed me to get the a/f relatively close. The idle speed just takes a bit of tinkering and trying different combinations out with the timing. As far as them operating in sync mechanically, there was never a real problem.
Old 02-07-07, 04:58 PM
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Originally Posted by dantheman
But, when they work. . . . . its what everyone wants to run.
Who told you that. After constant failure VW people move to IDA's. An IDA isn't as driveable, but it'll make tons more power.


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