ok
i run my car ...perfect , no problem , everything works great ......but , as soon as i turn on my a/c i get my RPM`s drop from 1100 all the way to 600/700 , no problem there
But when driving with the a/c on as soon as a stop somewhere the car wants to stall ,
There is no idle air controll valve , or anything like that on the 20B intake ,and i am running a microtech LTX12 (which doesn`t have enough outputs (just 1) to controll a idle air controll valve ,even if there was one)
I thought first of raising the rpms a bit but i am already at 1100 , i dont want to be driving a street car with a 1300 RPM idle
Any suggestions?

 

I don't know man... I think usually the EL (electronic load) unit senses the load and bumps the idle up using the IAC. What if you manually adjusted the idle air control valve with a switch? I know it sounds kind of ghetto, but it may work, lol.

 

see thats the thing , there is no IAC valve on the 20B mani ....i am going to try tunning my load maps a bit , maybe it will help
i can`t believe i am the only one with this problem .......

 

Your going to have to bump the idel up under the ac load with the idel screw. Thats about the only way of doing it since you adjust your idel manualy

 

Have you considered using a 20b throttle body (IAC is located on the bottom of it)?

 

i have a 20B throttle body ....hhmm...didnt see a IAC valve unde it , will check now
plus even if i do find it , i dont have an output for the microtech to activate it or can i ?

Side note my 1000th post .......buuyah !

 

you don't NEED to control it electronically. . .you can do it like me and the other cavemen and just use a good ol flathead. obviously, you'll need to do this manually eveytime you wish to change the setting.

the haltech has stepper motor control for the IAC, dunno if the microtech does.

if you haven't, you may (or may not) want to remove the second set of butterfly valves from your 20B TB so it's more similar in response to the FD TB. that's what I did, not too hard at all.

good luck
ryan

 

damn ....just checked , very true there WAS a IAC valve there , and seems that in a fit of anger i "deleted" the holes for it too
hhmmmm....seems like i really screwed myself up here
crap........ i will have to think of something else to make it work ,
any sugestions to this tradegy? adjusting the idle screw higher i would have a problem with since i am already idling at 1100 rpm, so .....there has to be something

 

So let me make sure I have this straight since you've only said it 5 times. Even if you had an IAC valve the MT wouldn't be able to control it? Is that what you're saying? j/k

How about using one of the solenoids from someone's old rats nest. Wire it so that it opens when the A/C is on and closed with it off. Use a restrictor jet in one end and plumb the other end to a vacuum nipple. Size the restrictor to adjust the idle. Would be a boost leak as long as the A/C was on but I'm assuming the A/C shuts off at WOT anyway so it wouldn't matter much.

 

ludwig , .......you crazy ,...crazy man !!!!.......that might just work !!
actually that sounds like a great idea , why the hell didn`t i think of that before
Thanks , i am going to be solenoid hunting tommorow in my old sequential stuff

Just for info :......the LTX12 only has 1 input and 1 output (aux) the current input is not in use and the current output i have is controlling the radiator fans so i have no more outputs to controll the IAC , i guess i could wire the fans directly and have that output free
But i kind of liked your`e idea better
I`ll let you guys know

 

FYI Bosch makes external idle air control valves that do not require flanges of any kind; they connect to a hose. Electromotive might sell them. I believe they are also listed in the Motec catalog. I don't think a single solenoid will be big enough.

 

Already modified the idea. Put a one way check valve between the solenoid and the intake. Keeps positive pressure from blowing back out. The little filters that are on the ends of some of the solenoids would work great on the inlet side to keep from sucking up the odd piece of debris.

 

thanks guys these are some awesome ideas , i like the "simple" aspect of it , unfortunately i suddenly got a eye ionfection and the doc says i have to stay away from my toys for a while damn , so i will not be able to try it untill next week

 

oh come on man. . .you know you can do it blind folded. . .get it rollin

ryan

 

you can use a gm stepping motor , I am going through the exact same thing with my 20b microtec set up for right now i have the idle set @ 1300 w/ no overheating issues but i will be doing the stepping motor I had one on my old car 20b , haltec it worked perfect!

 

i liked the idea of the solenoids , but damn my eyes are killing me , they actually changed color , i didn`t even know that was possible
will try it soon
ryan...i know what you`re saying , but it got me this time ....damn