Thread: What is maxium pulse width on 04+?

I am regularly seeing up to 25ms of ipw and my 05 is stock. It's running pig rich from using "The table modifier thingy" to tune it with, but I plan on changing my MAF table back to stock tonight.

Jeff

injectors are fine if stock. you judge the ltft at idle and cruise and wot to adjust the maf. things need to fully learn, you cant rush the table modifier thingy with bad un learned scans, or you get crap back.

id put the maf file back to stock. let it learn, then scan.

I wait several days before I use a scan. I will usually log right after, but I don't use those logs. I usually have about 200 miles on the car before I use a scan.

Jeff

have you tuned up the rest of the bin yet? made it like a dhp 1.5?

No I start with my stock .bin and went from there. I'm going to look at the map here in a few minutes.

Jeff

I forget if the injector data logging is correct with those 2004+ cars.

But general rule of thumb is 85-90% duty cycle is about all you can run on injectors and I think with the stock ones which are like 33 or 36lbs is around 19-21ms ipw.

The Datalogging is the same between DHP and Torque. I'm not sure they are both off but they will show the same information. So what is the time period? If 85% of 20ms then the time period is 23.5ms? Could it different a time period for 04+?

Basically if the time period is 1 second and you have a pulse width is 75% duty cycle then the pulse is 750ms

If the time period is 100 ms and the pulse with is 80% then the pulse is 80ms

It seemed to do this with the stock setup as well but we'll see. I was just wondering that the time period is.

Jeff

forget the injectors, they are fine, your stock still. you dont run out of injectors till a 3.2 pulley gets put on.

Google 04+ gtp injector pulse width. Multiple threads on other sites about it being different than 97-03. I've been in your boat (only I was modded and worrying big time about running out of injector and pump) and came to the conclusion that 04+ is fine past 25+ ipw.

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http://www.clubgp.com/newforum/tm.asp?m=2193197

Read this.

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I know I'm not running out of injector at this point, but I'm trying to learn what the limits are. I'm looking at the modified table and the stock table and most of the areas where there are changes they are lower than stock. For instance at 2875Hz my data at that point is 7.39% lower at 4.51g/s stock is 4.87g/s.
In the MAF airflow table these are the results.

from 2875-6875Hz the chart is about 8% lower. From 7000-10500Hz I'm about 4% lower than stock. Shouldn't this mean that it is leaning out the car, since it sees less air at the same frequency points?

Jeff

Yes that means your leaning it out. Go back to stock and flash it then see where you're at.

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Ok Chris I read the whole thing and got that the 04+ will run over 25ms pulse width, and that running too rich will cause the engine to knock, which I knew is a possibility. What I'm worried about is that since I'm actually leaned out and my KR is lower than stock and my AFR on a wideband was greater than 9.6:1 the operator said that anytime he touched the gas that it "pegged" the meter. If I go back to stock I'm going to be fatter than it is now. Wouldn't you think?

Jeff

can i see your bin?

If your maf is lean and youre still that fat then your ifr must be messed up. This i guess isn't a stock tune? I'll reread then give more advice but if mechanically everything is good and you think your tune is the issue, it's most likely your maf or your ifr that's leaning you out.

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*fattening you up I meant.

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Yah, I'll send it over.

I think I figured out why the injector flow rate chart starts at -50kPa. I believe that they screwed up and it should read from 10-160kPa which would make since since 101.3 is atmospheric pressure so anything higher than 100kPa on a return style boost referenced system will have the same flow rate since the net pressure is still the same.

Jeff