blasthole

Stock nikki, not mechanically modded. At what RPM should the secondaries open?

I had the RPMs at 5000 and the butterfly in the secondary didn't open, nor did any fuel jet in.

Thanks!

FB II

i'm pretty sure you can't check that at idle, they open under load. so you need to get your friend to sit on the front fender with the hood up while you haul ***. to answer your question though, i have no clue and am curious myself, CARL!!!

12abridgeport

you are supposed to keep the secondaries shut with a spring or something and take it for a test drive and see if it makes any difference, if it's going to start to surge you know it was opening up before.

MosesX605

There is a distinct difference in pedal feel when the secondaries want to engage. The pedal should feel stiffer as you punch it. On my '79, the difference in intake noise is substantial between the primary and primary + secondary operation.

eddierotary

iTrader: (7)

you can hear the roar from the intake when the secondary opens under load. i know because in my friend's car does that.

FB II

well that's eggzachtly why i want my exhaust noise to come down. my exhaust is so loud i hear absolutely nothing else. but i do know my secondaries are opening since i'm puttin down 110rwhp. i am going to do the mechanical secondaries operation monday i hope! WOOOHOOOOOO!!!!!! do our carbs sound good when they are roaring?

Rx7carl

I know you didnt mean "at idle", you meant standing still. But yes you are correct, you need to have a load on the engine.

Lookieme

OK, this may be a little off topic. But the 13B in the 84-85 GSL-SE (like mine) have six ports, right? lol. I'm sure yall can answer this for me. ( I know i sound stupid)

Rx7carl

Yes, they are 6 port engines. And no you dont sound stupid. If you dont know and ask, thats not stupid. If you dont know and you pretend that you do, thats stupid.

82transam

iTrader: (18)

Not sure what kind of air filter setup you have but if you still have the stock box with the lid on you won't get a whole lot of intake noise. Its there obviously, but not very noticable. a K&N filter makes it a bit louder especially at higher rpms. hehe run it with no lid on and you'll hear that ****** loud and clear

spoolin

a poor-man mod i did was cut out the center section of the lid and use a commercial grade air filter from home depot. it came blue so look closely and you will see what i mean. i worked at domino's when i was younger and snatched a 10" pizza screen. put it on top of the OE filter (to keep the element from getting sucked in) and then put the new filter on top of the screen. when clamped in place, this is what you get.......


along with mechanical secondaries,you could really hear the carb roar

Wankelguy

About 3800-4000 rpm.

eddierotary

iTrader: (7)

true, and with a open tipe air cleaner with a K&N too

FB II

yea, that's what i meant. LOL whoops. now, would your exhaust mods make a difference on when they open? like say stock compared to my setup with the rb header, piping, high flow muffler?

-zac

Rx7carl

Possibly, what it really is it this. Its based on air flowing thru one of the primary bores on the carb, so its load based only, other than the linkage that keeps it closed till the primaries have opened a certain amount.

FB II

well said. TIME FOR MECHANICAL SECONDARIES!!!! who's with me!!!!!!! hahaha

-zac

82transam

iTrader: (18)

yes go with mechanical. I'd tell you to go to my site to see some pics on how to do it, but it ain't there anymore. Its easy though, don't worry.

FB II

didnt someone have a how-to on the mech-secondaries? i have the general idea of what i'm supposed to do and could probably bust open the carb a bit and get it done, but to what sacrifice? i dunno. i'd rather have a look thru. hahahaha

Cortex

Yeah.. Sterling wrote it up. Here's the article in the archive: Carb Crap...Nikki Mods

..Matt

82transam

iTrader: (18)

Actually come to think of it I think there is another thread in the archives where someone (was it error402?) put pics of the finished mod. Its really all you have to see, you could figure the rest out.