How to loose 200kgs?....

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vlad01
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Re: How to loose 200kgs?....

Post by vlad01 »

Dylan wrote:There is some sag mode and dead band settings for IAC. In this case id smooth the VE at 800rpm 40kpa areas and log from there no closed throttle VE or learn. The logs show way rich and lean but the wide band reading can be a bit laggy at idle too. Did you start with stock V6 VE table?


Saying that do you think I can get my own car to bloody idle? Thinking something mechanically might be out. Bloody thing just hunts once warm. I've tuned dozens of V8's some heavily worked others stock. This bloody thing ported heads stock ported intake 284 cam. Don't kwow why it's so hard.
yeah I need to smooth out those spikes, but biggvl told me to stop playing with the idle haha.

it likes 900 rpm idle. its nice then its cool and likes yours goes all wacky once warm. But I already know the cause just need to find the IAC settings associated with it.

No plenum spacer might actually help the idles as there is less delay in filling it the smaller plenum when the IAC opens. My theory is without the spacer the hunting will be a higher frequency with smaller amplitude.

Did you try idling it without the spacer Big G? any difference?
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Gareth
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Re: How to loose 200kgs?....

Post by Gareth »

Yeah, warmed it up (which it did do quite well :thumbup: ) at idle, after the run, including driving it off and on the trailer it seemed about the same. But like i said earlier, dont give much of a shit about idle so as long as it doesnt foul plugs :lol:
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Re: How to loose 200kgs?....

Post by vlad01 »

Biggvl wrote:Yeah, warmed it up (which it did do quite well :thumbup: ) at idle, after the run, including driving it off and on the trailer it seemed about the same. But like i said earlier, dont give much of a shit about idle so as long as it doesnt foul plugs :lol:
you wont get fouling on e85. it doesn't carbon up.
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Dylan
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Re: How to loose 200kgs?....

Post by Dylan »

Maybe also look at the transient iac steps too, it's a table. Compare them to 12P they might be lower in 11P being an auto trans tune. That does wonders for a cammed V8 manuals it slows the transition to idle. More so when driving but but also on a return to idle from high revs even in neutral.
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Re: How to loose 200kgs?....

Post by Dylan »

I just done the opposite on my mates V6 wingless dropped them steps right down. Revs up and down snappy as in neutral. No gear changes to worry about in them.
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Re: How to loose 200kgs?....

Post by Gareth »

that sounds good as we dont change gears either
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Jayme
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Re: How to loose 200kgs?....

Post by Jayme »

I had a look at the tune and logs today. I have had similar idle issues which ended up being VE table holes.... its hard to get the head around the cause of the loop when looking at these things, as it doesnt seem to follow logic, but smoothing out that VE table always stops the hunting. I have a few speedway cars running a ecotec engines with cam's running 808's, and I have never had to touch the IAC settings in any of them. just a good VE table and away it goes. the latest one was a bit strange, wrecker special VY motor with a cam: In 236@050 Ex 241@050 107LSA. holy fart sounds like a big block and wouldnt idle under 1200rpm. power comes on at 3500 like a 2 stroke.... not ideal in my opinion but the owner reckons its good on the track.

anyways I reckon next time you are in the car, smooth off the VE table completely before you start, then hold the revs up at 1000 in neutral, do the VE by hand live, just go up and down, keep an eye on the wideband but see where it likes idling most by ear and by watching the map sensor. lowest map is happiest fuel, in case your cam is letting air out at low rpm and making your wideband lie. in fact I dont really look at the wideband at idle.... tune it by ear, you can hear when its happy. do each cell 1000,1200,1400 up to about 3000 rpm in neutral and stop, and leave those cells you have tuned and smooth out the rest of the cells around it. then I rekcon the idle will be way better.
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Re: How to loose 200kgs?....

Post by Gareth »

Thanks Jayme :thumbup:

Top explanation, will be doing that for sure and will report back, hope to get back on the rollers on the weekend.
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Re: How to loose 200kgs?....

Post by Jayme »

also its way lean above 5600 rpm..... richen those VE cells up lots to about 88 as the calcVE says and watch it up there next run. being that lean up that high is engine busting material.

another one of those different stokes for different folks things, but ive never used a calculator spreadsheet when tuning... I tune the cruise cells live, and then for WOT runs, I look at the monitor graph and adjust the VE cells at WOT based on the wideband reading with a calculator in me other hand typing one cell at a time lol. its a bit of a sanity check and I can smooth VE as I go rather than using a spreadsheet calculator and smoothing the errors out afterwards, I feel like thats a bit of tail chasing.
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Re: How to loose 200kgs?....

Post by Holden202T »

i agree with Jayme, big cam and your pushing un-burnt fuel through the motor at idle, so always needs to be a tad richer than a stocker!

i've also found with my gemini if i have too much IAC steps at idle it can't react quick enough before a stall sometimes so i did open the butterfly more so its only about 5 steps at idle, so if it does go below the desired idle rpm the butterfly will catch it before a stall!
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