500cc inj = rich tickover @ 2.50ms inj time ?
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500cc inj = rich tickover @ 2.50ms inj time ?
running dta, have lowered the tickover injector time to 2.50ms which is the lowest i can go before it cuts out , but i am still rich with a lambda of 9 is it cus the size of the inj is opening with such a small amount of time but still letting loads of petrol through ?
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A "lambda of 9" means nothing ?????????
do you mean AFR or lambda ???
If you mean 0.9 lambda then that is not that rich !!
If it is truly rich, you have at least one or more of the following problems...
1) fuel pressure too high
2) Injectors are not fit for purpose
3) cam overlap causing low manifold pressure
4) sequential injection - injectors in wrong firing order
do you mean AFR or lambda ???
If you mean 0.9 lambda then that is not that rich !!
If it is truly rich, you have at least one or more of the following problems...
1) fuel pressure too high
2) Injectors are not fit for purpose
3) cam overlap causing low manifold pressure
4) sequential injection - injectors in wrong firing order
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Originally Posted by SECS
A "lambda of 9" means nothing ?????????
do you mean AFR or lambda ???
If you mean 0.9 lambda then that is not that rich !!
If it is truly rich, you have at least one or more of the following problems...
1) fuel pressure too high
2) Injectors are not fit for purpose
3) cam overlap causing low manifold pressure
4) sequential injection - injectors in wrong firing order
do you mean AFR or lambda ???
If you mean 0.9 lambda then that is not that rich !!
If it is truly rich, you have at least one or more of the following problems...
1) fuel pressure too high
2) Injectors are not fit for purpose
3) cam overlap causing low manifold pressure
4) sequential injection - injectors in wrong firing order
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Confused !!
You say AFR 13.5 - I understand this.
But what does 9 to 10 mean ?
I reckon your injectors are not suitable for what you want them to do.
They may be good for power but idle will be a problem !
In this situation, you must either ...
1) accept a rich lumpy idle
2) lower the fuel pressure (which will reduce top end fuelling too !)
3) use a higher idle speed to keep injectors in usable working range.
Are you using grey injectors by any chance ?
You say AFR 13.5 - I understand this.
But what does 9 to 10 mean ?
I reckon your injectors are not suitable for what you want them to do.
They may be good for power but idle will be a problem !
In this situation, you must either ...
1) accept a rich lumpy idle
2) lower the fuel pressure (which will reduce top end fuelling too !)
3) use a higher idle speed to keep injectors in usable working range.
Are you using grey injectors by any chance ?
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Originally Posted by SECS
Confused !!
You say AFR 13.5 - I understand this.
But what does 9 to 10 mean ?
I reckon your injectors are not suitable for what you want them to do.
They may be good for power but idle will be a problem !
In this situation, you must either ...
1) accept a rich lumpy idle
2) lower the fuel pressure (which will reduce top end fuelling too !)
3) use a higher idle speed to keep injectors in usable working range.
Are you using grey injectors by any chance ?
You say AFR 13.5 - I understand this.
But what does 9 to 10 mean ?
I reckon your injectors are not suitable for what you want them to do.
They may be good for power but idle will be a problem !
In this situation, you must either ...
1) accept a rich lumpy idle
2) lower the fuel pressure (which will reduce top end fuelling too !)
3) use a higher idle speed to keep injectors in usable working range.
Are you using grey injectors by any chance ?
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Are you gonna rev the engine to 9000rpm??
If not, then you want to re-set some of the break points for down at the bottom end of the map perhaps?
Be interesting to see how this turns out as im about to start mapping my DTA on 437cc injectors in the next day or two
If not, then you want to re-set some of the break points for down at the bottom end of the map perhaps?
Be interesting to see how this turns out as im about to start mapping my DTA on 437cc injectors in the next day or two
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Originally Posted by Turbosystems
I'm not supprised at 2.5m/s at idle with an injector that size is this an 8 litre engine
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Are you using one or two squirts per two engine revolutions? Is the management sequential or batch injecting? Also, surely the tuning resolution must be more accurate than 100 us?
Upto a point you could play with the ignition timing at idle to retard it a bit so you can idle with a higher map value. You can also try to lean it a bit at your idle speed and richen a bit just below your idle rpm, so if it tries to stall or run bad, then it will pick up again. Same with timing too. A rising rate fuel regulator will also improve the situation a little.
Upto a point you could play with the ignition timing at idle to retard it a bit so you can idle with a higher map value. You can also try to lean it a bit at your idle speed and richen a bit just below your idle rpm, so if it tries to stall or run bad, then it will pick up again. Same with timing too. A rising rate fuel regulator will also improve the situation a little.
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Originally Posted by Stu @ M Developments
Originally Posted by J871yhk
Your options are:
1) Fit smaller injectors
2) live with it as it is!
3) find better injectors
Alex
1) Fit smaller injectors
2) live with it as it is!
3) find better injectors
Alex
#20
Lee, are you sure its not the ignition timing causing it to cut on lower fuelling, and like miker says, try a slightly higher idle at this stage, then work back to a lower idle later on once you have cracked it.
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Originally Posted by chip-3door
Lee, are you sure its not the ignition timing causing it to cut on lower fuelling, and like miker says, try a slightly higher idle at this stage, then work back to a lower idle later on once you have cracked it.
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