Loss of torque with 4" exhaust? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 07-15-2007, 06:53 PM Thread Starter
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Loss of torque with 4" exhaust?

I just put 4" exhaust on my truck this spring and pull a 10,000lb 5ver. It seems like the truck has less torque than it did pulling last year with the stock exhaust. Is it me or has anyone else noticed this? The truck makes more boost than it did before but just doesn't seem to have the lugging power it did before. There are no codes and the truck runs great. Could the difference be the new ULSD fuel?
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post #2 of 12 Old 07-16-2007, 07:54 AM
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well you will hate to hear this before i got the truck i do know i bought it with stright pipes and then put 3 in true duel with muffler and i could pull my dads skid loader alot better with that back pressure it was a 1998 chevrolet 454
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post #3 of 12 Old 07-16-2007, 07:58 AM
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Quote:
Originally Posted by JJR View Post
I just put 4" exhaust on my truck this spring and pull a 10,000lb 5ver. It seems like the truck has less torque than it did pulling last year with the stock exhaust. Is it me or has anyone else noticed this? The truck makes more boost than it did before but just doesn't seem to have the lugging power it did before. There are no codes and the truck runs great. Could the difference be the new ULSD fuel?
what year is your truck?
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post #4 of 12 Old 07-16-2007, 08:44 AM
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Quote:
Originally Posted by JJR View Post
I just put 4" exhaust on my truck this spring and pull a 10,000lb 5ver. It seems like the truck has less torque than it did pulling last year with the stock exhaust. Is it me or has anyone else noticed this? The truck makes more boost than it did before but just doesn't seem to have the lugging power it did before. There are no codes and the truck runs great. Could the difference be the new ULSD fuel?
The ULSD might be a small cause but I don't think it would be the main reason. It might be that you are now "use to" to the more power the truck has and it doesn't seem like it once did......if it was the exhaust I would think you would notice it right away, not later down the road, but just my 2 cents, here is a bump for you!

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post #5 of 12 Old 07-16-2007, 09:00 AM
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Quote:
Originally Posted by TwinTurboStroker View Post
The ULSD might be a small cause but I don't think it would be the main reason. It might be that you are now "use to" to the more power the truck has and it doesn't seem like it once did......if it was the exhaust I would think you would notice it right away, not later down the road, but just my 2 cents, here is a bump for you!
I have to agree with TT I have had my truck for about 3 weeks now and all of a sudden I thought I felt a huge power loss but everybody who rides with me says it feels the same that I had just gotten used to the power (time to add more ) I was terrified something was wrong but nothing was wrong.

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post #6 of 12 Old 07-16-2007, 11:34 AM
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Originally Posted by dieselpower99 View Post
well you will hate to hear this before i got the truck i do know i bought it with stright pipes and then put 3 in true duel with muffler and i could pull my dads skid loader alot better with that back pressure it was a 1998 chevrolet 454

Gas needs backpressure... Your turbo builds all the backpressure you need...

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post #7 of 12 Old 07-16-2007, 05:52 PM Thread Starter
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Truck is a 99 (Nov 98). 4" from turbo back with superchips 1705 and a intake system. Thanks for the input guys. Other comments welcome.
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post #8 of 12 Old 07-16-2007, 06:11 PM
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I'd check all the regular stuff...

fuel filter, new intake, oil change, coolant change etc...

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post #9 of 12 Old 07-16-2007, 06:40 PM
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i noticed a huge difference when i changed out my fuel filters, just like brand new!!

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post #10 of 12 Old 07-16-2007, 07:21 PM
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Put it back to stock and drive it for a few days or a week till you get used to that feeling again. Then put the chip or programmer back to work and start SMILIN again!!

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