Strange engine judder between 2000-1700 RPM

Give input on tuning as well as any tips and tricks you may have. Also feel free to share base mapping files for various engine types.
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86sixsix
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Re: Strange engine judder between 2000-1700 RPM

Post by 86sixsix »

Dayle wrote:I don't have a map sensor it's tips for everything.
then you will probably want a lot bigger numbers for the first 10-20 turns
Dayle wrote:Firing tooth is currently set to 0 could this be the problem do you think ?
possibly...0=top dead, 1=(360/no of teeth on wheel incl missing)x1 degrees, 2=(360/no of teeth on wheel incl missing)x2 degrees etc etc
Dayle wrote:Also cool on time and injector start pulse what do these doo
they're in the instruction manual
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Dayle
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Re: Strange engine judder between 2000-1700 RPM

Post by Dayle »

Just been reading through the instruction manual, Engine runs a 60-2 missing tooth. will try and set to 1.
JON-TEC-RALLYE
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Re: Strange engine judder between 2000-1700 RPM

Post by JON-TEC-RALLYE »

greetings, you still have problems with the start in the Canary temp, no less than 20 º, I try to open the engine throttle, a little only. observe the mixture during the heating phase, and discuss it.
to map, start initiation requires time,
of engine failures beginning of the post, has not said anything,

lambda tries to keep the rich values ​​in the beginning.
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Dayle
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Re: Strange engine judder between 2000-1700 RPM

Post by Dayle »

Hi Jon, there isn't currently a Lambda on the car at the moment.
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ignitionautosport
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Re: Strange engine judder between 2000-1700 RPM

Post by ignitionautosport »

That should have been the first step, so you're not completely blind guessing. ;)
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Dayle
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Re: Strange engine judder between 2000-1700 RPM

Post by Dayle »

I know, the rest of the map is fine and was set at the rolling road, obviously on the day you pay for it to run right when warm and only have 1 stab at the cold start each day. Think the Mrs would like a Inovative LC1 for xmas? :lol: It is her car after all.
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ignitionautosport
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Re: Strange engine judder between 2000-1700 RPM

Post by ignitionautosport »

At last, someone realistic about what can be done on the day! :D

I think she would love one.
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86sixsix
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Re: Strange engine judder between 2000-1700 RPM

Post by 86sixsix »

if its just the starting you're bothered about - a lambda won't be of any use. what's it like when it's started but still cold-ish - any good?
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Dayle
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Re: Strange engine judder between 2000-1700 RPM

Post by Dayle »

When it moves over to the warmed up map aboutt 50 degrees it's fine, in a morning the idle is very up and down and starts too smooth out when it hits about 30 degree,s I've changed te settings to the ones the rolling road bloke put in for start up ad it starts now just up and down idle for first 5 mins. This is the same settings as DTA have in the hand book, am I correct in thinking a large up and down in revs is lean running?
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Re: Strange engine judder between 2000-1700 RPM

Post by VR6Turbo »

Does it have an idle valve? A hunting idle with a DTA running an idle valve is usually caused by wild PID numbers or the base PWMs are varying too much through the rows.
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