Lag from takeoff - What's normal? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 07-15-2010, 01:28 PM Thread Starter
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Lag from takeoff - What's normal?

Been reading about extreme lags from takeoff when punching the throttle, as much as 5-6 seconds. Mine falls on its face for about 1.5-2 seconds with a lot of smoke on anything more than half throttle then takes off like a scalded ape. Just curious what's normal and what indicates a problem. I would expect some turbo lag. What does yours do?



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post #2 of 21 Old 07-15-2010, 01:38 PM
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Typical turbo-lag for a few seconds +/- stock.

If chugging black smoke in that time - check your EGR valve - may be a bit coked up.

Turbo lag is pretty normal with stock systems though. Different turbo's, tunes, or just spool the turbo - all ways of eluding the lag.


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post #3 of 21 Old 07-15-2010, 02:52 PM
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after egr delete mine hits pretty damn quick even the ford tech was really surprised

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post #4 of 21 Old 07-16-2010, 07:00 AM Thread Starter
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Quote:
Originally Posted by LHMissions View Post
Typical turbo-lag for a few seconds +/- stock.

If chugging black smoke in that time - check your EGR valve - may be a bit coked up.

Turbo lag is pretty normal with stock systems though. Different turbo's, tunes, or just spool the turbo - all ways of eluding the lag.
Yanked and cleaned the EGR this morning. Little carbon but not too bad. I have about 46k adjusted miles and its never been out as far as I know.

I've got a Tru Flo foam filter in and I'm wandering if its really coming clean when I wash it. I ordered an OEM filter and I'm hoping that will clear up some smoke.



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post #5 of 21 Old 07-16-2010, 07:07 AM
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A tune will help reduce lag tremendously. It will smoke a fair amount before the charger lights; that's normal and if you run a tune, it will smoke even more.

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post #6 of 21 Old 07-16-2010, 07:18 AM Thread Starter
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I've tried with and without. Smokes either way. Yours smoke worse in the summer? Wondering if heats a factor.



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post #7 of 21 Old 07-16-2010, 07:27 AM
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Without a tune, it smokes quite a bit? Mine depends on the position of the "go" pedal. If I'm laying into it, it will smoke like crazy until the turbo lights. Without a tune, mine will barely haze... Right now temps are around 115* and it doesn't seem to affect the amount of smoke.

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Exterior Mods:
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Icon Adjustable Trac Bar
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post #8 of 21 Old 07-16-2010, 07:47 AM Thread Starter
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Yep. Not sure what the deal is. If I lay into it it smokes like a freight train until the turbo catches up and even then it blows some black smoke when floored...stock tune.



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post #9 of 21 Old 07-16-2010, 07:50 AM
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Quote:
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Yep. Not sure what the deal is. If I lay into it it smokes like a freight train until the turbo catches up and even then it blows some black smoke when floored...stock tune.
Try a short test drive with the air filter off. Are you the original owner?
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post #10 of 21 Old 07-16-2010, 11:19 AM Thread Starter
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No but I know the original owner and have visited with him a couple times about the truck. Last time it started smoking, an air filter fixed it which is why I thought cleaning the Tru Flo would work. The OEM filter should be here in a few days.

Just an FYI. Replace the rings and gasket on the EGR if you clean it. I just learned the hard way. Thought everything was hunky dory until I drove a few miles and it starting hissing like crazy. I got to do it all over again with a gasket kit.



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