Help me pick a carb...
11-23-05 | 10:05 PM
#1
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From: Surrounded by Sebey parts, Rhode Island
Help me pick a carb...
I'm putting in a SP 13B out of an S5. I want to carb it. I have the racing beat SP exhaust. I would prefer a side draft carb, because I like the way it looks better than the upright webers.
What kind of carb would you guys recommend? More importantly, what size? 48, 51, 40DCOE, I don't understand any of that ****. I just want something that will make good power, not constantly need adjusting, and is pretty straight forward to install.
What kind of carb would you guys recommend? More importantly, what size? 48, 51, 40DCOE, I don't understand any of that ****. I just want something that will make good power, not constantly need adjusting, and is pretty straight forward to install.
11-23-05 | 10:17 PM
#2
First off all let me tell you, (this is just IMO) you will never get a weber to run right without a MASSIVE amount of tuning. To give you an idea of what im talking about, ive been trying to jet mine just so for about 6 months now. It is a long process because I order jets, have to wait for them in the mail, and then find out they didn't do what I wanted lol...
Your best bet is probally a weber 48dcoe for your setup. But in all honesty I think that it would be cool to go for the downdraft. You should make more power with a downdraft and the streetported 13B, but the powerband will be at higher rpms. With a sidedraft (at least in my experience) shifted my powerband to about 4-6k rpms.
Webers are badass carbs I like mine, except for it sucks down the gas, no choke, constant jetting... but on the up side: sounds badass (has a loud grunt to it), makes a massive power difference, easy to tear appart, look cool. But if you as me, you basically trade off daily drivability for performance in a way, unless you get it tuned perfectily.
Your best bet is probally a weber 48dcoe for your setup. But in all honesty I think that it would be cool to go for the downdraft. You should make more power with a downdraft and the streetported 13B, but the powerband will be at higher rpms. With a sidedraft (at least in my experience) shifted my powerband to about 4-6k rpms.
Webers are badass carbs I like mine, except for it sucks down the gas, no choke, constant jetting... but on the up side: sounds badass (has a loud grunt to it), makes a massive power difference, easy to tear appart, look cool. But if you as me, you basically trade off daily drivability for performance in a way, unless you get it tuned perfectily.
Last edited by Dan_s_young; 11-23-05 at 10:20 PM.
11-24-05 | 08:04 AM
#4
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From: Surrounded by Sebey parts, Rhode Island
Originally Posted by Dan_s_young
First off all let me tell you, (this is just IMO) you will never get a weber to run right without a MASSIVE amount of tuning. To give you an idea of what im talking about, ive been trying to jet mine just so for about 6 months now. It is a long process because I order jets, have to wait for them in the mail, and then find out they didn't do what I wanted lol...
Your best bet is probally a weber 48dcoe for your setup. But in all honesty I think that it would be cool to go for the downdraft. You should make more power with a downdraft and the streetported 13B, but the powerband will be at higher rpms. With a sidedraft (at least in my experience) shifted my powerband to about 4-6k rpms.
Webers are badass carbs I like mine, except for it sucks down the gas, no choke, constant jetting... but on the up side: sounds badass (has a loud grunt to it), makes a massive power difference, easy to tear appart, look cool. But if you as me, you basically trade off daily drivability for performance in a way, unless you get it tuned perfectily.
Your best bet is probally a weber 48dcoe for your setup. But in all honesty I think that it would be cool to go for the downdraft. You should make more power with a downdraft and the streetported 13B, but the powerband will be at higher rpms. With a sidedraft (at least in my experience) shifted my powerband to about 4-6k rpms.
Webers are badass carbs I like mine, except for it sucks down the gas, no choke, constant jetting... but on the up side: sounds badass (has a loud grunt to it), makes a massive power difference, easy to tear appart, look cool. But if you as me, you basically trade off daily drivability for performance in a way, unless you get it tuned perfectily.
11-24-05 | 08:24 AM
#5
DCOE is a sidedraft. I believe it does have a built in choke. I like the choice of the 48 size. The IDA as Dan said will give you the most power, but the DCOE is a good street carb. You'll just need a good fuel pump. (I use a carter) and a FPR. Ebay has them all the time.
11-24-05 | 12:32 PM
#7
Eats, Sleeps, Dreams Rotary
Joined: Jul 2004
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From: Allentown, PA - Paterson, NJ
Mikuni 44 !!!!!!!!!http://cgi.ebay.com/ebaymotors/Mikun...QQcmdZViewItem
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11-24-05 | 01:29 PM
#8
OLDROTA
Joined: Apr 2003
Posts: 1,389
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From: Los Angeles
Go the 48 IDA....tuning is NOT THAT HARD! Before you start jetting wildly, ask around, find a good baseline and buy two jet sizes larger and smaller. Spending money on useless jets just plain sucks and can be costly, luckily they are pretty easy to find around L.A. I've been playing with the tune a few months and have gotten quite good at it. I've never had to re-adjust anything, set it and forget it...until you make major engine changes!
Current set-up (pulls like a bastard!): 48 IDA
40 mm chokes
F-11 emulsion tubes
230 main
210 air
120 idle holders w/ 70 idle jet
My mileage is pretty damn good for a big SP and IDA....I can drive normally (some crusing and some WOT runs) and fill the tank in my Rx2 every 4 days...., maybe 18 mpg, not bad actually. Since it never really gets below 50 degrees in L.A., I have never had a problem waking up and just driving off, it bucks a bit till warm, but so do most ported rotaries.
If you take a serious look at cost, the sidedraft is not much cheaper if cheaper at all than an IDA set-up. Over the top carbs also mean more heatsinkfrom being so close to the engine...at least you can shield the IDA a little easier. Check ebay for the older italian versions...you can often pick up 2 (for a bug) at a bargain, sell one, and buy the rest of the setup with the profit!
Trust me...you will not be disappointed.
Current set-up (pulls like a bastard!): 48 IDA
40 mm chokes
F-11 emulsion tubes
230 main
210 air
120 idle holders w/ 70 idle jet
My mileage is pretty damn good for a big SP and IDA....I can drive normally (some crusing and some WOT runs) and fill the tank in my Rx2 every 4 days...., maybe 18 mpg, not bad actually. Since it never really gets below 50 degrees in L.A., I have never had a problem waking up and just driving off, it bucks a bit till warm, but so do most ported rotaries.
If you take a serious look at cost, the sidedraft is not much cheaper if cheaper at all than an IDA set-up. Over the top carbs also mean more heatsinkfrom being so close to the engine...at least you can shield the IDA a little easier. Check ebay for the older italian versions...you can often pick up 2 (for a bug) at a bargain, sell one, and buy the rest of the setup with the profit!
Trust me...you will not be disappointed.
Last edited by Jaime Enriquez; 11-24-05 at 01:32 PM.
11-24-05 | 02:35 PM
#11
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From: Surrounded by Sebey parts, Rhode Island
Originally Posted by Latin270
Mikuni 44 !!!!!!!!!http://cgi.ebay.com/ebaymotors/Mikun...QQcmdZViewItem
11-24-05 | 04:03 PM
#13
Hunting Skylines
Joined: Apr 2001
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From: Brisbane, Queensland, Australia.
Originally Posted by $100T2
Which you just happen to be selling...
11-24-05 | 04:30 PM
#14
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On the prowl for an FB
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From: Surrounded by Sebey parts, Rhode Island
Originally Posted by REVHED
44's are too small anyway. Go with a 48IDA. They make great power and changing jets, venturis etc takes about 5 mins.
11-24-05 | 07:20 PM
#17
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On the prowl for an FB
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From: Surrounded by Sebey parts, Rhode Island
^ Exactly. 
Plus, the guy who got me into 7s way back in the day had a 13B with a Dellorto, and it was just the coolest ******* thing ever... I want to duplicate his kind of performance... He had a SP, full RB exhaust, Dellorto, and N2O. I don't know if I'll go nitrous like he did, but I just might.
Plus, the guy who got me into 7s way back in the day had a 13B with a Dellorto, and it was just the coolest ******* thing ever... I want to duplicate his kind of performance... He had a SP, full RB exhaust, Dellorto, and N2O. I don't know if I'll go nitrous like he did, but I just might.
11-24-05 | 07:54 PM
#19
My wife bought me 2 RX-7s
Joined: Aug 2001
Posts: 2,328
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From: Saskatoon, Saskatchewan, Canada
Originally Posted by hornbm
a weber 48DCO would do you good
its a sidedraft you could get a DCOE if you want a choke
Contact robert at rotary shack, he does great work.
its a sidedraft you could get a DCOE if you want a choke
Contact robert at rotary shack, he does great work.
11-24-05 | 09:00 PM
#20
Eats, Sleeps, Dreams Rotary
Joined: Jul 2004
Posts: 3,247
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From: Allentown, PA - Paterson, NJ
Originally Posted by $100T2
Which you just happen to be selling...
Last edited by Latin270; 11-24-05 at 09:21 PM.
