I am getting ready to purchase this from mazda trix and am wondering who has installed or knows someone who has this on there rx7? If so what was the performance like over the stock carberator. also what type of fuel pump and regulator was needed, thanks

Brad

 

I also would like to hear more about this, because i do need a new carb. I hear it makes your car really cold blooded though.. so lets hear from the elders i supose.

 

What do you mean by cold blooded? ?Ive heard that its a really nice performance upgrade but it would be nice to hear from someone who has installed one.

 

What do you mean by cold blooded? ?Ive heard that its a really nice performance upgrade but it would be nice to hear from someone who has installed one.
swccattack@yahoo.com

 

I got the weber 45 and had it installed on my stock ported 12a, and all I Can say is oh my it ran so perfect. So much better than the stock carb. But I have an alum flywheel, undrive pullies, e-fan, header, etc etc basicly all the bolt ons. I was using at the time the stock fuel pump, which wasn't smart on my part, would lean out in the upper rpms, sometimes due to the pump going bad. I would use a carter fuel pump(which is what I have now), as they do flow a couple more gallons an hour than does a holley, and carter doesn't recquire the use of a pressure reg.

If I had to do it all over again, I would get a 48 weber and use it for a streetported 12a. But I bought my first for the stockport and don't have the 450$ for a new 48 weber, but I plan on getting the bigger weber for my streetport.

If you look around you can buy the manifold for like 200$ from mazdaracing.com, and then buy the weber possibly a 48mm from like rotaryshack.com, or even mazdaracing.com sells them. I do not work with either but they have the best prices Maybe it will help you save some money, unless you want the "kit". Sorry for the long post but if you need some help, I am sure I can help you out, or others would be glad to.

 

Racing Beat said they're high end carbs but dont have choke and a really cold blooded to start even in warm climates. Thats almost a direct quote from them, but I imagine that after running a min or so it would run sweet, cause just look at them, they're sick!... sounds like i am gonna get one though haha, later all.

 

Mine started in sub-zero temps no problem without the choke connected. Just pump 4 or 5 times on the pedal first. You had to cover the throttle coming up to junctions for the first mile, but my car is set up for heel and toe so that wasn't a major hardship

 

My weber has a choke, never ever needed to use it always started up... sunny, raining,summer, winter, fall, spring, day, night... it didn't care all it wanted to do was go...

 

i can sell you a weber intake at a very good price!! i also include x-tra jets with all intake orders!!
www.Rotaryshack.com

 

I got mine from Rotary Shack and its a great carb. It started up just fine every morning with a couple pumps. I never even bothered to hook up the choke. Great power and great sound. I would definatly buy another one.

~T.J.

 

all sidedraft carbs, no matter if its dellorto, webber or mikuni, came with a choke for easy warm up during cold weather. RB was referring to the IDA style.

 

No, but your carby does.

 

My friend put a 45 on his stock port 12a. It ran much spoother, and jetts were a breeze to change. As far as performance goes it might have given a few ponies but barely noticable. However, with a good streetport and exhaust, you can hit in the 180hp range The IDA s will give more power from their design, but they arn't recommended for street for they are basically a switch.

 

Just wondering how much more kick it gave. Sounds like most people are happy with it. Ill look into the 48, maybe that would be better. As for the engine, its street ported and I have racing beats exhaust system, So im hoping with the carb upgrade, I will notice allot more power since it will be able to breath. I was looking at mazda trixs whole intake system. But ill shop arround.Thanks for the imput. also pics would be nice if anyone can post them,

Brad

 

You guys say how it starts in your winters, yeah...the people who don't know what a winter is. haha Florida does not have a winter, I'm sorry nor does Washington. Oki, Washington can get cold, but when I lived there I never had anything lower than the 20s and if it hit low 30s it was rare.

Now, the question is, would it start in -10 or 20 degree temps? Perhaps with a windchill of -30 or -50 at extremes.

 

i will hibernate once Socal temp goes down to 60.

 

not me! im comin outta hibernation dude!!! thats when my 2 snails work the best!!!!
oh, WACKO, i dott u dont like snails?? y r u building one? oh.....i know, u felt the sting eh.

 

me nuts goofy.

 

I have a 45mm weber sidedraft setup on my 12a.
I need the choke, couple of cranks and a couple of pumps to start. It also bogs a bit at low rpms so I'm not sure if it needs a rebuild or just proper tuning.

 

try using smaller venturies then work your way up. then play with the jetting. remember: no two engines are exactly alike.

 

wacky is right on! on a 45 carb you need 36mm venturies to get the best driveability out of it, with no bogging

 

680
since i got the right answer, do i get a discount on my blow thru turbo project??

 

absolutley!!!

 

36 mm chokes do give very good low end torque and smooth drivability but I found out personally with 37mm chokes my 12a streetport didn't make any more power over 7500rpms. It was just spinning the motor over that. Ballpark 36mm's would hit maximum flow around 7200rpms give or take.

Of course if you want smooth operation that is a way to go. With a stock ported 12a I wouldn't go smaller than 37mm, and would try out 39mm's.

 

I was looking into rotary shacks kit and I thought man thats awsome but then i came here and you guys said they're not for daily drivers. why ?is it the choke the jets ? what ? if it is the choke i don,t give a dam i live in las vegas ! lead me in the right direction.