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flyingdutchie
Original Poster
441 posts
63 months
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I have the LS 6 litre with the LS3 heads and a cable throttlebody. It is the Holdenspec engine. I am curious what experiences are of others regarding idling. I have a MBE ECU btw. At what revlevel are your engines idling. Mine is now at ca. 900-950 rpm. I managed to get it down just a bit. It first was idling at 1000rpm. My expectations were that an engine like this could idle at 800 rpm dead smooth. Maybe even a bit lower. To me it is annoying and other people also notice that the engine is idling at rather high level. Tel me what your experiences are.....
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Walford
834 posts
35 months
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LS idles at 840 in my car below that i get clutch judder over speed bumps and gentle clutch engaugement
ye i know thats the paddle clutch,
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flyingdutchie
Original Poster
441 posts
63 months
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Walford
834 posts
35 months
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Brummmie
4,215 posts
90 months
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flyingdutchie said: I have the LS 6 litre with the LS3 heads and a cable throttlebody. It is the Holdenspec engine. I am curious what experiences are of others regarding idling. I have a MBE ECU btw. At what revlevel are your engines idling. Mine is now at ca. 900-950 rpm. I managed to get it down just a bit. It first was idling at 1000rpm. My expectations were that an engine like this could idle at 800 rpm dead smooth. Maybe even a bit lower. To me it is annoying and other people also notice that the engine is idling at rather high level. Tel me what your experiences are..... If you are on a stock cam, you should be able to go lower than that. 800rpm should be easy enough. Can you not just wind the screw out? You might need to plug your laptop in and play with the fuel/timing just to get it fine tuned.
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Walford
834 posts
35 months
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Has somone drilled a bigger hole in the butterfly
or
Has air idle control valve not been blanked off correctly
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Walford
834 posts
35 months
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flyingdutchie
Original Poster
441 posts
63 months
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I did get it down slightly by screwing the screw on the throttlebody. If I try to go below the rpm's I mentioned the engine stalls. So, I think it has to be in the ECU settings to get it lower. I am not very good at playing with ECU's. I can load an other mapping in the ECU or (en)(dis)able lambdafunction. That is where it stops.
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Brummmie
4,215 posts
90 months
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I can get mine to 4-500rpm, but i prefer more so i can use tickover in traffic so am at around 8-850rpm, but i am on ITB's which run nicer.
But yes it sounds like you need to play with settings, as i say timing/mixture.
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flyingdutchie
Original Poster
441 posts
63 months
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Thanks for the comments......
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Walford
834 posts
35 months
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 , Good Quality wide band AFR, would be were i would start somwhere were both driver and passinger can see it .
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tinker-27
803 posts
93 months
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have a look at the idle control some ecus use ignition to help control the idle and you may have strange numbers in yours, the advance might be holding it up. also check for air leaks on the manifold as the seals can leak and cause problems. evn with wild cams they normally idle ok . its not a FAST throttle body is it ?
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flyingdutchie
Original Poster
441 posts
63 months
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Yes, it is a FAST throttlebody.....
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Brummmie
4,215 posts
90 months
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flyingdutchie said: Yes, it is a FAST throttlebody..... Craig is asking because they can be a bit "sticky", they do not always return back to the stop as they should.
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teamHOLDENracing
4,819 posts
136 months
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Air flow on my race LS3 is sufficient to overcome the internal spring in my FAST throttle body. They are notoriously weak so had to fit an additional external spring to ensure the butterfly closed when off the throttle
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flyingdutchie
Original Poster
441 posts
63 months
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There is an external spring fitted to the "butterfly", where the cable is attached. So, I guess that should be ok.
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Walford
834 posts
35 months
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Most aftermarket ECU,s come with "sites" for fuel and ignition at 500rpm then 1000,1500,2000,2500 up to top revs
To get good idle you need to add sites at idle speed say 820 then one just below say 750
and maybe one just above
the lower site (750) can have slightly more ing timing in
Best to keep an eye on Air/Fuel when playing with ecu setting, and keep a backup map
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tinker-27
803 posts
93 months
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Fast throttle bodies are a pain In the ass the spring on them is not strong enough on any Ls , ALL the Ls motors that I have seen them fitted to stick I won't fit one myself as they don't return to idle if you slowly return throttle ( if you flick it it will return). You can fit an extra return spring which helps . Normally if you spend time and get the fuelling correct and set the idle control it will idle well even cars with super light clutches and no iacv will be fine ,
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tinker-27
803 posts
93 months
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flyingdutchie
Original Poster
441 posts
63 months
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Sorry guys.....it's a Wilson instead of a Fast throttlebody. The camshaft is the oem (standard) one. So, it's a very mild one.
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