Clutch Slipping Or HPOP Lag - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 12-25-2007, 02:23 PM Thread Starter
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Clutch Slipping Or HPOP Lag

My brother has a 99 F250 superduty 7.3l, AFE Stage ll, Banks Exhaust Brake
4" Monster Exhaust. He had a superchip micro tuner in it and all was well. I tried putting my triple dog in it and all was NOT well. It's a 6 speed std and once in overdrive and you lay into it it would feel like the clutch was slipping. But I've also heard that when the HPOP isn't keeping up the truck will rev up but not move to much. Never has had a problem with clutch before and he also pulls a trailer and hoe with it that way bout 13-14,000lbs. No slipping. Also heard the 99 HPOP's were garbage.
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post #2 of 7 (permalink) Old 12-26-2007, 12:51 PM
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The clutch is probably slipping in OD due to the added power. I don't see how a weak HPOP would feel anything like a slipping clutch. The early 99's do have a weaker HPOP than the newer trucks but late 99's are the same as 00 and up trucks.

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post #3 of 7 (permalink) Old 12-28-2007, 01:11 PM Thread Starter
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I didn't quite get the hpop deal either. I read in a different forum that if you lay into it and the pump lags that the truck will rev up but feels like it's falling flat on it's face. Sound like a crock to me. I've always known it as once the pump starts lagging you won't feel any more power as you increase the throttle. For example you'll feel a power incease up to 3\4 throttle but from 3\4 to full you won't feel any difference. That I read in info about a stealth HPOP system.
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post #4 of 7 (permalink) Old 12-28-2007, 08:27 PM
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If the engine is revving up, but you're not going anywhere, then your clutch is slipping.
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post #5 of 7 (permalink) Old 01-03-2008, 02:49 PM
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if you're doing this level of modification to the truck, you should be able to tell one from the other. Its a manual transmission, so any increase in RPM should result in an exactly linear increase in speed. If the rpms are going up and the speed isn't changing, your clutch is slipping, end of story.
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post #6 of 7 (permalink) Old 01-04-2008, 01:57 PM
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Quote:
Originally Posted by dieselman723
I didn't quite get the hpop deal either. I read in a different forum that if you lay into it and the pump lags that the truck will rev up but feels like it's falling flat on it's face. Sound like a crock to me. I've always known it as once the pump starts lagging you won't feel any more power as you increase the throttle. For example you'll feel a power incease up to 3\4 throttle but from 3\4 to full you won't feel any difference. That I read in info about a stealth HPOP system.
You are correct about what the HPOP will feel like if it is not keeping up. It will be nothing like what a slipping clutch feels like. paulkeith's explanation is spot on.

Don't believe EVERYTHING that you read on the internet. Sometimes you have to consider the source that the information is coming from :Thumbup: I know that is hard to do when you are new but hopefuelly there will be enough of the knowledgeable people reading to call BS when needed.

Eric
96 F-350 CC Dually My TDG Gallery
B codes, head studs, Comp 910 valve springs, stock turbo w/ 1.00 turbine housing
6.0 IC, NAPA 6637 air filter, AeroTurbine 4040XL, ITP Overboost Annihilator,
Quadzilla Commander, electric fuel system w/ regulated return
coolant filter, 203* thermostat
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post #7 of 7 (permalink) Old 01-05-2008, 02:54 AM Thread Starter
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I figured it was the clutch, but wasn't 100% sure on the HPOP deal so I figured I mention it. Funny part is my brother always busted my ba**s about my truck being an auto and my tranny as less problems with a 140HP tune than is with a 90HP tune.
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