Vohaul

so...if from what i understand about carbs is right...if i adjust my fuel mixture to lean it out just a touch...it should have a slightly better response and a bit more power...

car is kinda runnning a bit rich...i notice a bog upon lanching and a yellow colored bumper skin above the exhaust

so is leaning it off my answer?...i dont see any vaccummm leaks... (rats nest is coming off as soon as i get the acv blockoff plate...)


Paul

damon

I would say yes but you dont want to lean it to much I believ it will cause severe damage to the engine

peace

Vohaul

well....ok..i figured that....(i have a couple rc10 gt's (rc gas trucks)..with the same leaning richening kinda thing....anyone know how much of a turn does what?

Paul

SilverRocket

No no no, you guys are reading way too much into the idle mixture screw.

Fist of all, that screw only effects *idle* mixture and nothing else. Obviously, if it's adjusted very badly, you'll get a little bog if you try to floor the gas all of a sudden, but beyond that it has no effect on the mixtures you're running while you're accelerating, on the road, etc.

Vohaul,

That yellow colored bumpered skin is because you've removed your cats and you're spitting hydrocarbons out the back like a ****. That happens on every single RX-7 out there with a straight exhaust. Don't worry about it.

Secondly, if you still have a stock carb with stock jetting, I will guarantee you that you are not running rich on the low-mid range of the powerband. You may be running a little rich on the high top end; this is how Nikki's were set up and one of the reasons why they tend to fall off above 7k. You cannot change this with a stock carb, because the air correctors are not adjustable (versus a Yaw carb on which they are). The only things that are adjustable are the primary and secondary fuel jets, which won't help high end mixture very much. Those effect the mid-range more than anything else. So, you may see a little power increase in the mid-range by going about 1 size up on the primary fuel jets and about 2 sizes up on your secondary fuel jets.

So.... don't mess with your idle mixture unless you are idling shitty. Otherwise, leave it alone, and if you do want to play with it, read up on it and understand what it does.

Vohaul

hey...silverocket..thanks for all the info..im just taking my little carb knowledge from the gas rc trucks and applying it here....so any added info is helpful

so if you think running rich isnt the problem, why would you think it bogs upon launch?

thanks

crankit

check your accelerator pump. you should see gas right when you start to move the gas linkage if not that could give you a bog or hesitation. Also if the carb is rigged up for mech. secondaries that could do it too.

SilverRocket

I don't know much about Nikki's bogging... mine never did. Your idle mixture could have a small effect on this, but I wouldn't imagine it's the whole problem. Accelerator pump sounds likely to me, but I'm sure it could be all kinds of things.

The guy you want to ask this question is Sterling, he's the Nikki master.