Looking for a little help if anyone with AE is near me. I have a 2003 F250 that has been DP tuned. Truck pulls great off the line but seems to fall kindof flat as the RPMs go up. Once the TC is locked, and RPMs are down, it pulls like a freight train again. My service engine light sometimes comes on during WOT pulls but goes of quite quickly. I'm wondering if my HPOP is getting weak and can't keep up. Was hoping to be able to hook up AE and see what's actually going on. Going to change oil, and all filters this weekend to see if that helps.

Thanks!

 

i think you are correct....about the HPOP

I have AE but I'm not really near Huntsville tho.

Heres a bump for ya.

 

I had this precise problem. I installed a T500 HPOP that I bought from Riffraff, and an FRx to get rid of the deadhead issue. My Injector Control Pressure came up 34% and that fade at high RPMs went away. I also got a bump on the bottom end with it... just when I thought I was good on torque. That being said, there are those that would argue DP's Fuel Injector Pulse Width is too high on the 80e tune and solving that would possibly reduce/eliminate the need to get a better HPOP. I say the tuner is asking a lot out of my aging stock injectors and it's possible there's no easy way to program around this. I have not heard of a definitive answer to this - and many are looking into it. The only thing I know for certain is the HPOP really woke the truck up.

 

80e is the tune I run in about 99% of the time unless I'm towing, of course. Sounds like a HPOP upgrade is in my future....time to start saving my PMS pennies. . Thanks for the input fellas!

 

Your SES is likely triggering with boost. Where does the boost gauge peak out?

 

Mine does the exact same thing as yours it except the Ses light. I have an OCR from riffraff which will stop the Ses light when you overboost.I have AE and Like tugly said my pulse width goes high at the time the power drops off. I too may need a T500 but can't afford one. I need to call DP and see if they can modify my tune (80E) to mabe get around this pulse width issue until I can afford a T500. In stock mode my pressure and dutycycle are good, but in 80e as the pulse width gets up to I think it was about 4 or so my pressure and dutycycle drop fast when hard on the throttle in 80E. I think (im not sure)it also will cause low boost also as I can only get about 29lbs of boost? I would assume you would see the same on yours. Good luck

 

I get 30 with a stock turbo, 80e, and my T500. It tries to go higher, but the WG spring opens there. I'm reluctant to set the spring higher because I still don't know enough about the truck to risk going for more. The SES is my friend - it's like lightning to go with the thunder. Another thought in my pea brain: My MAP goes to full voltage during WOT and I think the tuner sees this to add more fuel. If I trick the MAP, I don't know if my tuner will/will not limit the fuel during WOT. I get a long run of coal in 80e at WOT, but that could be the tired injectors.

 

I agree, the SES is most likely due to overboost. Thankfully, my tunes prevent de-fueling, but I guess they don't prevent the light from coming on. I have seen as high as 30lbs of boost, but not sustained. Highest sustained boost I've seen is about 28lbs, and that's with my wastegate line disconnected. (Stock turbo, stock HPOP and 80e) I was wondering if the HPOP pressure being low would cause the SES to light up, or if the code it throws doesn't light it up. The reason I didn't think the SES was caused by boost, was because it goes off so quickly after I get out of the throttle. I've always read that the overboost code would keep the light on for about 15 min or so. Maybe some of the DP tuner guys will see this thread and chime in with their thoughts on the pulse width.

 

They won't likely jump in until they have something to report. It is an open dialog between some users that are really into this and the good people at DP Tuner. I have not yet learned if the PW is going long because of the program or because the program is demanding enough that only new hardware can meet it without causing the PW to go wide. I see it as a chicken and egg thing, but others will have a different take than I. I am not the expert on diesels, I'm more of an engineering theorist (techno-fireman).

My SES is on for something like 30 seconds, but I neglected to throw a stopwatch on it.

You can see my boost on a steep climb in the first link in my sig.

 

Well, the more people we get talking about this the better. Sounds like you're seeing the same time period for SES illumination that I am. You have verified that yours is being lit up by the over-boost code? I have ZERO issue with that being the cause of my light.....I kinda like it.

 

The overboost code is expected when the MAP sensor indicates 25 PSI or more. I was boosting about 27 for a year and never saw the SES light. I found my MAP sensor signal was intentionally grounded by the PO to prevent the SES alarm, along with a few other goofy mods that could only work with a canned chip or gawd knows what. I removed that short-to-ground from the MAP sensor signal and up jumps the SES on the very next WOT run.

I have added a 4" exhaust and the HPOP (as mentioned) and things are pretty lively. Before the exhaust upgrade, the boost would jump to 20 and inch its way up to 27 as fuel/RPMs overpowered the backpressure. You can see in the aforementioned video that this is no longer the case. My stock tune hammers to 22 and sticks there because of defueling.

 

Yeah, a 4" exhaust should be mandatory on these things! Thanks for all the input. I enjoy reading all your other posts. Btw, my truck's name is "Tiny"

 

You named your truck with irony in mind, I named mine with infamy in mind.

Thank you for the compliment!