Directfreak

iTrader: (2)

I would just convert it to Mechanical, and put a stiffer spring, so you will know when you hit the secondaries. It will make for better economy, and more power, once you re-learn the power curve.

Oh, and a 650 is perfect for BOOST.

Spinner-D(eluxe)

Well why is Racing Beat selling the 600cfm carb with their 6-port kit? I assume they are the experts right? There has got to be a reason for it. If you find out let me know.

Spinner-D(eluxe)

I don't know how much I flow. I just trust that when Racing Beat sells something as a kit it is built to proper specifications. If it is not, and RB is selling these kit's knowing darn well they won't work without mechanical help on the secondaries, they are going to need to list that on their product page and add it to their instructions for future buyers. I will get to the bottom of this Monday.

Junia

Its funny how they recommend using a holley 465 for a 4 port 13b. Also if you look at the page for a 4 port 13b they also talk about using the setup in a 84/85 13b. I'm also guessing that the 600 is too big. Everyone I know uses the 600 for when they bridgeport the motor.

Rx7carl

Sorry about the confusion Spinner. In your original post you said you had a 650, not a 600. I missed the correction post about it being a 600 when I re-read the thread. Still, the secondaries should open under load. The white spring is the lighest, but you tried them all already right? Back to a basic question. How do you know theyre not opening?

Spinner-D(eluxe)

That’s ok, my mistake caused your mistake. It's all cool. Anyways I know that the secondaries aren’t opening, because without mechanically rigging (screw trick) the car is slower than a stock GSL-SE. Also from running with the screw trick, I know what the power feels like on the top end and how it sounds. I realize some people could be fooled by the surge of power, and when running with vacuum only might think they are not working because the car feels slower even though it is running more efficiently and faster. This is not the case. I can feel a difference between the two.

If it is true that the 600 cfm 4160 is too big, I am happy running with the screw trick. The car is still loads of fun to drive and auto-x, but I being a slight perfectionist like things working with out jimmy rigging things.

I find it hard to believe a 600cfm carb is too big though. When running on just the primaries it's really only a 300cfm carb, and even when I rig the throttle to open the secondaries, there is no bog once I am ripping down the street WOT. Therefore I can assume the carb is still a source of restriction, and is not oversized. I will verify this with RB Monday.

No one has really answered my question though. If the carb is working perfectly, is there anything else that could cause the secondaries to not open? How much is engine compression a factor, or other engine variables?

Ok thanks Carl for your comments.

red13brx7

hey man I have a 13b 6-port with the racing beat setup and have been driving it for a year with the screw trick. The car drives awesome, i don't know what everyone is talking about when they say its to big, I think it near perfect once you get it tuned in. The car pulls hard from 3500 to 7000. And will run circles around most N/A cars.

red13brx7

Oh, I figured mine to just be a flaw somewhere in the carb or possibly the manifold to engine gasket. You really never know, I couldn't figure it out, and frankly vaccum secondaries kinda suck. I love mechanical, had it on my 12a stock carb to, they always run better with mechanical, you just have to learn not to smash the throttle, and ease into it.

Sterling

exactly.

Spinner-D(eluxe)

I'm fine running mechnical, but I am curious if anyone has ever gotten the vacuum secondaries to operate under vacuum. I'd even be curious to know if Racing Beat has got it to work.


I was having my brother follow me around in my RX-7 this morning, and he said I was shooting flames out my exhaust after hard pulls and then coasting. I thought that was neat, so I tried turning the ignition off while coasting, and pumping the gas a few times turning the ignition back on and letting out the clutch. I didn't hear any sound at all, but my brother said he saw a huge flame shoot out and wrap up over the bumper to the tail light. Also I tried turning off the ignition and then back on without giving it gas or touching the clutch. I'd hear a nice shotgun sound when turning the ignition back on. Just having some fun. heh.

813KR$

fun is what it is all about!

Crit : Their is another thread, with some one that has run a webber and a holey and their holley time was slightly faster, a 600 and I think 51 IDA down draft.

What are some of your times on the street ported 13b? With the weber?

Rx7carl

Well Im down to asking you to try it with no spring. Best guess I got at this point.

DieAgnostics

hmmm i got a holley and i was wondering when my secondaries opened up ... my boy told me they open at higher rpms but i can never take it up too high w. the stupid *** silencer on the muffler ... but w/o it its tooo loud, anybody got any ideas on what to do about that? somebody said racing beat mufflers or a RB pre-silencer will do real well. - oh ya its a 600 on a street ported 13b

red13brx7

get a racing beat presilencer and a hi-flow cat (for emmisions). It sounds real sweet.

813KR$

DieAgnostics:

Why would a "stupid *** silencer" stop your engine from reving high? ?restriction? Sounds like the secs not openeing? To me? If it is too loud for the street to test your theory, take it to Sunshine Wed night and run with straight headers only and see wassup? What have you done to your holley? Is it a RB one?

rxtasy3

iTrader: (2)

I really don't know when they actually come in, I just know that I want all 4 bbls open when my foot's on the floor. I do the same thing with the stock carbs, wire the secondarys to work manually. It really comes alive when u bring those secondarys in at 3k and above.

Spinner-D(eluxe)

OK all the problems I have been having with my secondaries not opening under vacuum are not isolated. I called Racing Beat today, and got some new info. I talked to Jim Tanner (very nice guy), and he informed me they have a 13B from a GSL-SE on the dyno and are trying to reproduce the problem with the secondaries not opening. He informed me they will have a fix within 6 weeks, and it might be as simple as a kit they send out to fix the problem, but worst case is I'll have to send my carb back. Jim said the kit was designed under the assumption that all 13B's were alike, but it seems something is different between the 85-85 GSL-SE 13B's and the 89=92 13Bs they used to design the kit.

This is really good news. I was worried that I had a bad kit, or there was something wrong with my engine, but it seems many GSL-SE owners that installed the kit have reported this problem.

I'll have an update in 6 weeks or less i guess.

Xavier8

Realized how old this thread was, but I will make a quick chime in that my 465 RB setup on a streetport 12a opens the secondaries very very well. They open about 3400 and the motor stops building power alittle bit above 7000. So much faster when they open, sooo much faster.
Oh, and mine also shoots flame after heavy accel then coasting.