Injector duty cycle??

[TRD_ZERO]

Im running a map from a fellow ts'er and he has been a great help with my project. Im having trouble with the tune or it might be something else hence me asking.
When starting it up and trying to rev it it seems to be dumping too much fuel, the injector duty cycle it for eg is 19% when im barely hitting boost. When the guy i got the map off was getting 19% duty cycle on 7psi. Why is mine doing what its doing? What would affect the duty cycle like that? Would vac leaks affect it? Map sensor error or setup?
His car was tuned with a 5bar map sensor so when i got his tune i had to change that in the tune to 2bar. Would that have anything to do with it?
If anyone could shed any light.

Blacktop turbo g3

[Akane]

Assuming you have changed the tune to 2 bar sensor properly, some of the things that affect inj duty cycle will be:

TPS position, IAT reading, engine load, water temp.

[TRD_ZERO]

Well i wouldnt get spark when it was set at 5 bar as my ecu would come up with an error saying map limit reached. Tps has also been recalibrated.

[ChaosAD]

Injector size settings?

[TRD_ZERO]

im using the same injectors as the guy i got the map off.

[AceSniper]

is the base fuel setting the same?

pull fuel out of the base or leave it till it gets tuned letting it run rich like that will bore wash, it can give you crap ring seal for the rest of the engine's life

[TRD_ZERO]

im not really running it like that just was a few minutes at a time to try fix the issue.

[QikStarlie]

where have you got the map sensor line plumbed in?

both cars blacktop with quad throttles?

[TRD_ZERO]

yes both blacktops with quads. Map sensor is from the only vac line on the far left.

[sergei]

yes both blacktops with quads. Map sensor is from the only vac line on the far left.

You mean the one is used for pressure regulator?
That is worn place.
There is another vacuum point - it comes from middle just below PVC line.

[matt dunn]

yes both blacktops with quads. Map sensor is from the only vac line on the far left.

You mean the one is used for pressure regulator?
That is worn place.
There is another vacuum point - it comes from middle just below PVC line.

Taking the map signal from where you have it will not work,
as you will get big pressure pulses, not constant vacuum.


I think sergei meant wrong place not worn place too.

If you have the BT manifold it will have a small fitting in the middle of all 4 ITB's right where is bolts to the head almost, quite hidden away.
You need to use that, or a fitting from the top where the brake booster signal comes from.

[TRD_ZERO]

you mean i should grab the map signal from the little vac line just between the cam cover and throttles. U think not having it there could cause this issue of mine?

[.:O4AGTZ:.]

you mean i should grab the map signal from the little vac line just between the cam cover and throttles. U think not having it there could cause this issue of mine?

sounds highly likely to me!

[TRD_ZERO]

Well im hoping that is the case. What other vac lines are there? I want to make sure i have them all covered. There is another one on the throttles to the left on throttle #1 then a cluster of three on the right on throttle #4. Is there any others apart from these 5?? Im just trying to eliminate leaks. Also im not running an oxy sensor could this be adding to the mess? As i understood it the oxy sensor was only really needed when getting tuned.

[sergei]

Well im hoping that is the case. What other vac lines are there? I want to make sure i have them all covered. There is another one on the throttles to the left on throttle #1 then a cluster of three on the right on throttle #4. Is there any others apart from these 5?? Im just trying to eliminate leaks. Also im not running an oxy sensor could this be adding to the mess? As i understood it the oxy sensor was only really needed when getting tuned.

Sorry for my bad typing.
I meant you supposed to use the one in the middle just under the PCV valve line. That line is solely for MAP sensor.

you mean i should grab the map signal from the little vac line just between the cam cover and throttles. U think not having it there could cause this issue of mine?

[TRD_ZERO]

Ok ill give that a run when i get home.

It has been over fueling quite abit when i was doing the tests and i popped the oil cap off and the oil smelt like fuel. Ive had the cap off for over a week hoping if some fuel had gotten into my oil it might evoporate. Should i be concerned or what should i do?

[sergei]

Ok ill give that a run when i get home.

It has been over fueling quite abit when i was doing the tests and i popped the oil cap off and the oil smelt like fuel. Ive had the cap off for over a week hoping if some fuel had gotten into my oil it might evoporate. Should i be concerned or what should i do?

If you are concerned about it just change oil, not too expensive and this way you are 100% sure everything is ok in that department.
It is good practice to change oil anyway if the car was sitting for prolonged periods.

[TRD_ZERO]

I swaped the position of the map sensor vac line and gave it a start up, the car idled but i was getting a howling noise out of the engine bay. the pipe that was connected to the pcv valve was causeing massive vaccume and when i just touched it the car died. what do i do with this pipe do i just block it off?And when i did have it plumbed into the pcv valve i was getting air comming out of the nipple on the cam cover by the dizzy. This could all have been a big vac leak causing it to run rich. No?

[sergei]

I swaped the position of the map sensor vac line and gave it a start up, the car idled but i was getting a howling noise out of the engine bay. the pipe that was connected to the pcv valve was causeing massive vaccume and when i just touched it the car died. what do i do with this pipe do i just block it off?And when i did have it plumbed into the pcv valve i was getting air comming out of the nipple on the cam cover by the dizzy. This could all have been a big vac leak causing it to run rich. No?

If you are having too much vacuum in crank case your PCV valve is either broken (stuck) and/or your atmospheric side of the PCV system is blocked.

With MAP sensored cars if you get a vacuum leak it will idle higher (similar to opening throttle) as they do not meter air directly, unless the leak is right on the MAP sensor line.

[TRD_ZERO]

so wat do i do with the hose that goes to the pcv valve? As people on here frown apon it when its pluged into the pcv valve. Can i just block it off? And ill put the hose from the pcv valve into a catchcan.