What i am looking for is some direction on finishing my swap.First of all i have a freshly rebuilt street ported 4 port 13b with 3mm seals. I am trying to decide what carb setup to go with. My car will be used to go back and forth to work which is about 40 miles a week or so. My prior setup was a stock 12a with a Racing Beat 465 setup and really had no good luck with it.Sometimes it ran good others it did not.I have looked all over the web and seen more people with Webers than anything else.I have heard they are great but a pain to tune beings they are like two seperate carbs, and also they are costly. Second of all is my exhaust choice. Should i go with a Racing Beat race exhaust over a street exhaust? I would like to get the most HP i can for the money i have to spend. Last but not least, what clutch? Stage 1 should be plenty over stock. I will have a budget of about 1500.00 or so give or take. Also, what is the benifits of Glimer Drive? Is it just for show and the sound? Is it worth the 300.00?

 

I vote for the side draft weber (or Mikuni or Dellorto etc) with the racing beat "road race" exhaust. The twin exhausts is almost a must for a ported motor. It is what I am running with good results. The ported motor really needs a free flowing exhaust. For me there was a learning curve on the carb tuning which led to the accumulation a collection of jets, emulsion tubes etc for experimentation purposes.

I hear that the weber downdraft carbs make more power but are very cold natured, especially for street use in the winter so I would stick with the side draft since its will be a dd.

To assist with the tuning I have ordered a wideband O2 sensor.

 

The Racing Beat exhaust is called a "streetport" exhaust by them. It has a road race header, a dual pipe center section (each tube has a presilencer), then the muffler has a Y collector and is compatible with a stock '81-'82 car, but flows well enough for a streetported 13B with a supercharger. I think you'll like it.

Get an Exedy stage 1 clutch kit part number 10806. It is 225mm in size, comes with a street strip strength pressure plate, stock clutch disc, pilot bearing, pilot seal, throw out bearing, plastic clutch alignment tool. You can find it at Respeed, Mazdatrix, Atkins etc. Driveability is said to be excellent. I ordered one for my friend's REPU just the other day. Waiting for it get here. Ask kentetsu how he likes his.

You could get a serpentine pulley set from Atkins. Same price, or close. Uses a nice and quiet 6pk serpentine belt, not the expensive cogged belt. Atkins finally makes a '79-'85 old style waterpump pulley (four bolt) for us 1st genners. I just picked one up for my 4 port 13B powered MG Midget last week.

 

i too have a streetported 4 port 13b, it's out of a 74 rx4. my exhaust is the RB streetport system, minus the dual presilencers. carb is RB setup for streetport(600cfm). clutch is RB street/strip. flywheel is unknown but is lighter than the steel one RB sells, and the counterweight is made into the flywheel. the guy i got it from claimed it was MFR. the clutch setup isn't a good match for it as it will slip when speed shifting. as for the gilmer drive, i here they get annoying after a while.
this vid will give u some idea of how loud it is.

 

Rxtasy, that one sounds great. All you've got is headers straight back to an rb muffler? I'm going to have to get one of those sometime if so. I've got headers back to the stock muffler and its annoying it sounds like a lawnmower. It also is loud but noise isnt a concern in my area.

 

Yeah, I don't care for gilmer, unless you're running a clutch fan. lol!

As for the noise, I'd rather have a Camden on it, so the noise is actually adding power instead of stealing it (making noise costs energy after all).

I just realised gilmer is kinda like rice where you have the sound of power ie supercharger, but it's not. That's kinda funny and sad at the same time. No offense to anyone out there reading this that likes gilmer drive systems.

rxtasy3, I've heard those types of really light but sorta stock looking flywheels are MFR. It's one piece of rotary old school trivia I haven't seen in real life... yet.

 

I have been running an rx4 intake and modded Nikki on a large street port 4-port 13b for years now and have zero complaints. I run an RB race header to 2.5in collector, then 3in back.

 

How is your performance? What hp do you think you achieved with your setup? Is 220 give or take a respectable guess? What does it cost to mod a Nikki? I have been using the search option but that takes you all over the place and not where i need to be.I went to Webers web site , i guess it was there site and found a 48 ida down draft for 369.95 without intake. This is brand new. I found 1 on Ebay for 600.00 plus shipping that was with intake but used. If i wait around i can find a Racing Beat holley intake used for a good price or buy one new for 230.00. I can buy a reman Holley 650 for 345.00 and have someone or me prep it for a rotary. So realy its a toss up between the two because price will be close.If anyone else on here has a similar set up please chime in and give my your likes and dislikes, vids, or whatever you think could help me decide. Thanks in advance.

 

What clutch would you get? I would think a stage 1 clutch is more than enough for a streetported N/A daily driver. You don't want one that is too harsh to drive in traffic

 

Good Luck! A downdraft weber will yield the most peak horsepower and if tuned properly you may yield 180 whp...

 

Yes, my mind is made up on the clutch. Stage one is all i need. Years ago a friend had a "bronze clutch" and that was a pain to drive, it was no feathering at all but damm it would **** hard and chirp through the gears!

 

Wow i guess Racing Beats numbers are WAY off. I was going by there numbers using their parts. Check it out and see what you think.

 

I could believe 220 HP at the flywheel. With a well-tuned 48 IDA, a 3" exhaust system, and a mild port job on a 6-port engine with the sleeves removed, Hyper4mance2K did 190 WHP.

 

My .02 cents.

RB Road Race exhaust (for streetport)
Centerforce DF Clutch. Nicer than stock.....with lighter pedal feel. Worth its weight in gold in my opinion.
Any sidedraft carb...weber, dellorto, etc. Dellorto is my choice though!

220 at the fly is not unrealistic with a fresh motor. I would expect in the 180's on the Dyno.....

 

Thats where they got me, lol but that is still good. Yes my motor is fresh, only about 5 hours on it.

 

What 3" exhaust? That wouldnt be to big? I need to hear sound of that one please.

 

the weber is really nice once you get it tuned, it does get expensive as you have to buy the carb plus all the jets and tubes and stuff.

of course you get to buy jets for any carb so i dunno that the weber is any different than a holley.

no matter what you use a wideband, is really helpful.

 

Im running a 12A with a Monster Judge Ito SP, Weber 48IDA, Stage 1 Clutch, RB flywheel and a 2.50 in exhaust to a Borla muffler. I wish my exhaust was a bit quieter but Im happy.

 

It's a custom exhaust system. No, not too big unless you like your eardrums. I guess it got quieter when he redid it with a Racing Beat 3" presilencer.

Here's a video of his car:
http://www.youtube.com/watch?v=U0vbPTuvCzs

 

wOW, I have watched this vid many times on youtube without knowing anything about this car. That thing sounds like it can get noisy real quick, but to me its not to bad.Thanks for posting it. It gives me some kind of direction to go.

 

noise is funny. at sevenstock people were telling me how quiet peepers is, yet 12 hours before that my neighbor came across the street and told me it was "loud enough to wake the dead"

if you live in an area where the dead try to sleep in the middle of the day, 3" is a little hard to do....

 

thanx. yep, basically that's all it is. it originally was the complete streetport system: road race header, dual presilencers, and muffler. i just put dual straight pipes in place of the dual presilencers. i think the rb muffler has a little deeper tone to them than what the stock mufflers do.

yep it looks just like the stock flywheel, all one piece with the counter weight. but bout half the weight. the stock rx4 flywheel was just too heat spotted to suit me and i found a friend that had this one. i had already decided to get a light one and he only wanted $150 for the one he had. but as i mentioned, the clutch setup i'm using worked really good on the stock f/w but not a good match on this one and slips alittle if i speed shift it like at the drag strip. kinda wondering what setup i need for it for when i need a replacement in the future. which could be quite some time since clutches seem to last me for ever.

 

On my 12a i had a header and 2 1/2 pipe all the way back to a "fart can?" and i was told it was realy load. I was told you could hear me a mile or so away. What i am wondering is how does that 3 inch work for you. I have been told you lose back pressure. Is that so. I dont think i would have the room for a Race header with dual 2 1/2 pipes all the way back. Does your pipe have smooth bends to it to make it work?

 

I would imagine more than 160 but less than 220. I modded the nikki myself so it only cost my time, it is basically a copy of sterlings magical carbs, just not as clean . I have driven several RXs with holleys and wasn't pleased with any of them, which is why i went the nikki route.

I really like the RB race header, but I don't know the make of the exhaust I have, it is obviously made for an fb. The pipe is 3in with two presilencers under the car, and a quite large 3in muffler.

I took a quick vid to show you how loud it is (plugs need changed):


http://www.youtube.com/watch?v=Z7jXguM7KxM

 

Thank you for taking the time to do that. That does not seem to loud at all, i think it sounds just right. Down here i dont have to worry about cops and such. They care more about audio systems than exhaust. I am just trying to figure if i go with the race header will i be able to fit 2 runs of 2 1/2 pipe all the way back or just go with 3" all the way back.