How can I improve my top end?? - Ford Powerstroke Diesel Forum

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post #1 of 16 Old 01-23-2011, 10:47 AM Thread Starter
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How can I improve my top end??

My truck comes out of the hole great but once I hit about 65mph, it doesnt have much. What can I do to improve my top end...my mods are listed below and the water methanol I just run straight water thru it and only use it when I'm towing..

2008 Ford F-250 Lariat Crew Cab 4x4, AFE 5 inch down pipe back exhaust, SCT X3 off road tuner with RCD 450 tune, FLO PRO EGR Delete, S&B cold air intake, Kenwood in dash screen with Bluetooth, Rockford 12" sub, Nitto Dura Grappler 35x12.50 20 inch tires.
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post #2 of 16 Old 01-23-2011, 10:53 AM
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nitrous/propane. turbos
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post #3 of 16 Old 01-23-2011, 11:34 AM
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Do you have a fuel pressure gauge???!!!????

You should have plenty of power above 60mph. You maybe starving for fuel, or there maybe an issue with the HPOP system (ICP,IPR,small leak of the HPOP).

Are you maxing out in boost or is it not reaching full boost? You may have a sticking turbo vanes, or even a small leak of the IC system (boots,crack IC).

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post #4 of 16 Old 01-24-2011, 01:14 PM Thread Starter
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Well my turbo sounds really weird, it boost's good but my ford dealer said it was fine. I have a video I will post and you can hear my turbo and see how my top end sinks down

2008 Ford F-250 Lariat Crew Cab 4x4, AFE 5 inch down pipe back exhaust, SCT X3 off road tuner with RCD 450 tune, FLO PRO EGR Delete, S&B cold air intake, Kenwood in dash screen with Bluetooth, Rockford 12" sub, Nitto Dura Grappler 35x12.50 20 inch tires.
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post #5 of 16 Old 01-24-2011, 01:27 PM Thread Starter
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See what you all think about it...


2008 Ford F-250 Lariat Crew Cab 4x4, AFE 5 inch down pipe back exhaust, SCT X3 off road tuner with RCD 450 tune, FLO PRO EGR Delete, S&B cold air intake, Kenwood in dash screen with Bluetooth, Rockford 12" sub, Nitto Dura Grappler 35x12.50 20 inch tires.
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post #6 of 16 Old 01-24-2011, 01:39 PM
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Do you have your speed limiter removed?

It really sounds like fuel starvation to me. I would install a fuel pressure gauge and see what your getting above 65mph.

With your mods you shouldnt be having that issue. It seems to happen right at 65 mph too which is very odd.

If you exhaust those options then I would talk to EDE or ITP about upgrading your fuel system and post regulate option.

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post #7 of 16 Old 01-24-2011, 01:52 PM Thread Starter
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yeah speed limiter is removed...I have a mechanican fuel pressule guage that I havent hooked up yet, I'm going to try and do it this week.

2008 Ford F-250 Lariat Crew Cab 4x4, AFE 5 inch down pipe back exhaust, SCT X3 off road tuner with RCD 450 tune, FLO PRO EGR Delete, S&B cold air intake, Kenwood in dash screen with Bluetooth, Rockford 12" sub, Nitto Dura Grappler 35x12.50 20 inch tires.
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post #8 of 16 Old 01-24-2011, 01:53 PM
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it sputters at 38mph also, sounds like a full issue run some ford ceatane boost but first check fuel presure

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post #9 of 16 Old 01-24-2011, 03:08 PM
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You need HP, your HP will overcome drag which is your biggest killer here at those speeds. As your speed increases, your body drag force increases as the square of the velocity. You come out of the hole great because TQ is what puts mass in motion, and these trucks have a lot of it.

You could go any number of routes to get more HP at the higher RPM's. Turbo's, Injectors, Nitrous etc etc

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post #10 of 16 Old 01-24-2011, 03:27 PM
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I'd start out y checking fuel pressure. A lot of trucks lose fuel on the top end. If so, I'd get an AirDog 2. If all checks out fine, it's time for some 155's, PowerMax, FICM Tune, and an AirDog.

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