evening guys

looking at ditching my nikki after all, and buying a holley carb to put on my j-port and was wondering what would be best, currently i have my eye on a 700cfm double pumper? is this going to be too big? could i jet this down?

many helps cheers fella's

 

maybe 650.

 

why use a dirty leaky holley.. i feel holleys should never have been made. (my thoughts) use a ida for your jport or a 48mm side drought.. ive now got a 12app in my road sa rx7 with a 48mm ida. goes well

 

you could make the 700 work but i think a 600 would be much better.
this is for a 12a??

 

I agree with him, 700 would would work but its going to require alot of tuning and a wideband to get it right.

 

i like my holley.....but i think a weber would be best......is it a street car..?

 

its a street car in the fact i have to drive to the strip. i hopefully have managed to get a 600cfm holley, with vacuum secondaries. webers are so expensive for what they are!!

 

No carb is too big or too small. It's all about how you want it to drive. Your preference.

 

I'm running a Holley 450 (not sure of the jetting) on a 12A streetport & she idles with a deep pulse, gets up and goes on the drop of a dime...

 

First carb for my first gen RX7 is a Racing Beat Dellorto 48 sold my RX7 force to sell to my compare's brother back in 1992, Same engine setup on my 510 I like Weber 48 IDA downdraft and get 18 to 22 mpg in the freeway if your not racing anybody. Running on monster street port 13B. Engine built by SidePex. Setup these way for 8 years, now its all about turbo. drinks gas like water, LOL. I do love the power!!!

 

If you want to go holley unless you can figure out what you need to do to tune it and change it up,, You should buy one that is already set up for a Rotary engine .. The rotary demands large volumes of air to run proper much the same as a two stroke piston engine ( that is why the power valves are usually removed ) , With high air flow there needs to be changes to the inside of the carb before it can be tuned proper ( resulting in people not liking them because guys don't know how to tune them and they have nothing but trouble ) plugs loading up .poor response all kinds of things ... 600 - 650 is all you should need . It's not how many cfm you have it is how well the carb deals with the fuel air ratio under different driving conditions and different internal carb pressures .. Just my opinion ..

 

^^^+1

 

BTW, if you're ditching the nikki cause yo're having to work on it and fine tune it, you're going to soon find out that a holley, even a weber willl take just as long to get right. Regardless of what anyone says. Just how carbs are..

 

I agree with Crispin's last post. I own a weber 48 IDA, 2 Holley's and 5 Nikki's. I've spent a small fortune trying to fine tune each one (except the Nikki) My advice would be to invest in a wideband. I have a AEM and its helped out sooo much.

 

^^+1.

 

A nice mechanical linkage Holley DP. Keep your jets down around the 60-62. Measure your manifold vacuum and get power valves that are 2 numbers lower than your max vacuum reading around idle. With a j bridge I would be surprised if its above 11 hg. So 8.5 to 9 should do it. Keep your idle around 16-1800. Remember that once you uncap it at the track you will need to increase fuel to make it a bit richer.

Make sure your spark is working perfect before you go chasing ghosts with a holley. It will give you nightmares to make you throw money at the wrong area of the engine.

Happy hunting.

 

no reason for ditching the nikki i know its not suitable for the j-port, also holley are so much cheaper. yeah looking at getting a wideband for the car. thank you army of one for the stats on what jets and what not.