DIY PROMDo It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.
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How can I tune for a lopey idle? My first idea was to cut timing and add fuel at idle but that didn't do it. Lowering idle speed didn't get me what I wanted either.
__________________ Increasingly I find the difference between a 'fact' and opinion is the number of people that believe it.
3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, early '769' heads with 3500 valves, LS6 springs & mild porting, worked over heddman headers, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle. 210hp at 5800ft (that's 270hp at sealevel )
From the post it sounds like he already has a cam with a lopey idle and hes tries to smooth it out. Some people keep the car in open loop mode at idle and that seems to help alot.......
when I first bought the car one of my injector plugs fell off cause the clip was broken, that made it sound meaner at idle. Also ran like crap, but if you want a lopey idle with a stock cam then running like crap is what you gotta do :P
someone already said it best. If you want a lopey idle then you need to get a lopey cam. I've never heard of someone trying to get the "lopey" characteristics outta a stock cam. These cars were designed to run like most any stock car...at idle, nice and smooth.
Guess I just want to see if it's actually possible.
YES, it is. Open the EGR at idle and you will find out. Thats the real reason a cammed engine runs rough at idle, the intake valve open early, which pushes exhaust gasses back into the intake, giving the engine self egr. I know because $8D controls the EGR valve differently than a TBI engine. I used the TBI EGR solenoid hooked to manifold vacuum when I first swapped to my TPI setup. I switched from the 7427 TBI PCM to the 7730 TPI ECM. When I hooked up the EGR solenoid, it allowed vacuum to the valve and the engine idled like it had a HUGE cam in it. Took me a while to figure out why the engine ran great, but idled like crap though. I hooked the solenoid up to the ported vacuum source on the bottem of the thorttle body and it works great now.
also little timing at idle will make it sound camed.... cause i just started runing my new timing tables, and got the ve close to what it needs to be, and it idles at 500 rpm, and you dont know the truck is even on, till i hit the go pedal. i added a bunch of timing at idle to quite the engine down, and smooth out my idle.
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