We were chatting in the V6 board and lets not debate about it now but a 2.8 will fly if you give it everything it has other wise your going slow. which means 2500+rpm launches if you wanna get somewhere fast.

Is there was way to make a two speed idle. Our gas pedal is kinda touchy, i raised my stock idel to 1000 rpm just to help with a launch. when you gotta launch 2500+ what do i need with a 700rpm idel 4???
I would love a two position idle.

1000 rpm for slow driving and 2200-2500 for having fun. makes it easier to keep it where you want and/or not much foot action needed to go higher.

one reply so far in the v6 section but I want to widen my search fo a solution.

"I *think* something like that might be possible if you could put a variable resistor in between the signal from the Idle Air Control and the ECM. It depends on if as air pressure increases the resitance from the IAC increases or decreases. If it increased, then you could just have a little dial (variable resistor) that you could control your idle speed with. Damn, that'd be sick as hell I dunno, maybe somebody somewhere tried this."

Anyone got any ideas. I could run some bicycle cable and levers; move a hunk of metal in the way but is there a better way.

 

cough...cough...cough...cough....

 

lol..
I'd give that bike cable idea a try before you start messing with the wiring. I looked around in my manuals but I couldn't find out how the computer controls the IAC(ie whether a resistor or potentiometer would work, or which wire to connect it to).

 

before you go reinventing the wheel, i'd invest in a high stall torque converter for your tranny. It will serve exactly the purpose you're looking for.

 

If you know ho to rig up a high stall TC in place of a clutch on a T-5 you are nutzzzzzzzzzzzzz..........

 

in that case why would you want or need the car to idle at 2500 to begin with? you can launch at any rpm you want with a stick.

having the idle set to 2500 is not going to make your car any faster in the least.

And if you rig it up so are still part way open throttle all the time, your rpms are gonna flare up when you shift, and you're gonna be banging into gears at high rpms unnecessarily.

 

Your problem is this.




And here is the solution.



And by the way. The tuned port car you see used to be a 2.8. Do yourself a favor and dump that anemic slug.

 

Had a V8 been there done that,its ho hum, gas cost too much. A 4.3 V6 mod one day but thats as big as I will ever go.

Other wise id be saving for a keith black hemi to stick in the back seat and go do some wheelies.

I see your V8 point but for me its either V6 or bigblock V8.

the whole point is the pedal is so touchy. when you have a stock idle of 700 and you need to launch at 2500+ thats allot of work. trust me. now a two speed idle would cure this problem and let you pay attention to where you are going and shifting gears. and you gotta get a good launch. most cars punk out when I rip second. Ram air ood and smoking tires tend to do that. But I must launch 2500+ and go full revs so second is 2500-3000.



If it could be done with a swtich shut it of once into third when you got a sec while it reving out. This would be for only well street racing, so I can watch the light and not my rpm gauge. I can cut a light like a mother if i can keep my eye on it.


I find the 2.8 fun like a 600 bike. good on gas but fast if you give it all it has. they rev like a bike. But its either slow or go. I dont have 300hp which can make up for a sloppy light or wimpy launch.

 

once more.

 

If you are really stuck on have a V6, but you still want power then the Turbo Trans Am setup is the way to go. I really don't think rigging your idle to be at 2500 is going to accomplish anything except waste the fuel you say you are concerving by having the smaller engine. And to be honest my TPI engine doesn't use all that much more gas then my V6 did. Good luck with whatever you decide.

 

bro, your logic doesn't make any sense.

1.A v8 costs too much in gas, but you want to drive around the V6 with your foot to the floor and set your idle to 2500?

I owned a 2.8MPFI car that i did drive with my foot to the floor all the time. And I swapped to a 350tpi iroc, which I seldom needed anything more than 1/4 - 1/2 throttle to cruise around town, never exceeding 3000 rpm, yet going every bit as fast as the 2.8 car did. My gas mileage change was very insignificant.

2.You think the pedal is touchy on a manual V6 car? You should try driving a supercharged 350TPI with a T56! That's what the above mentioned iroc is now.

If revving to 2500 and dropping the clutch to launch is a lot of work to you, then I'd recommend buying an easier car to deal with, like a civic.

3.I will agree with the slow or go comment, that's exactly how i drove my car around... The throttle was essentially ON or OFF. But considering a 2.8 anything fast, and especially street racing with it is a waste of time. The 2.8's and 3.1's run 17s and 18s at the track. Even if you're good with the manual and you did a few mods here and there, it would be amazing to see mid 16's out of it.

 

I am curious though... what kind of mileage are you getting?

My V6 never did better than 20mpg city and 25mpg highway. My ZZ4 is doing 19/24 and I don't even have it tuned yet.

 

 

Ok... I'm gonna agree with all the other V8 guys here... and say if you want power and less touchy throttle, go with an 8. My first camaro was a 1984 2.8, and my current one is a 1988 305. Granted, the 305s arent very fast, its still a hell of a lot faster than that V6 ever was or will be, and I have more throttle positions than on and off now. I agree with thewraith entirely. The gas mileage difference between my 2.8 and my 305 was negligible in city, and i actually got an improvement on the highway of a couple MPG. If revving your stickshift to 2500 and dropping the clutch is too much work, get a different car.

 

Found this by accident, but it looks recent, so here's my thoughts on a dual-idle.

Get an MSD 6AL box. It has a built in rev limiter. Add an MSD 2-stage rev limiter to the box, for two rev limiters. Set one rev limiter to your launch, which you said you wanted 2500 RPM. Set the other limiter to redline, as far as I've seen on my 2.8 has been 6000k. (Either that or i'm a puss, haha)

So when you stage, click the staging limiter on. Line up, and two-foot it so your gas is floored- you won't go over 2500 rpm. When the light drops, keep the gas floored, but engage the redline limiter. Suddenly your engine is "free", and will roar to life.

This is also a good way to tune your launches. Problem is, it's really hard to always stage at the same RPM. With the rev limiter, you don't have to worry about it. You're always at 2500 rpm. Want to try a new launch? Throw a 2300 or 2700 pill in there instead. If you bracket race, I think they disallow electronics in some races, so you couldnt use the 2stage box.

You could add a line lock and you'll be set. All you'd have to worry about is working the clutch pedal, no more brake pedal. Only thing I'd worry about is how safe a line lock would be on the streets- "racetrack" conditions are different than "street" conditions. One is more harsh in an explosive kind of way (1/4 mile), one is more harsh in an extended kind of way (cold winters with salty roads, stuck in traffic on a 100 degree day with the engine temp always hitting 230, etc).

 

How does a two speed rev limiter effect the engine in the long run. wont the car get loaded up with gas. still the same ammount of air and full as WOT but just not the right spark or fire.

like a car miss firing running rich

 

TTT

 

v8s get just as good of gas millage as a 6 does. A 8 you dont have to give it so much gas to get moving like you do with a 6.