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post #1 of 11 Old 06-17-2010, 01:19 PM Thread Starter
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Exhaust Theories and Question

Based on my knowledge of engine theories, i know going with a bigger exhaust will have a tendency to move the power curve up higher. Ideally one would want to have an exhaust large enough to handle all of the given exhaust volume with no back pressure, yet small enough to keep the velocity at its max speed throughout the system. Obviously in the real world its impossible to have a perfect system. If its too big, velocity will drop decreasing the scavenging effect and possibly in a sense creating backpressure due to lack of flow. On the other hand, go to small, i don't think i even need to explain that one.

So my question is, would going with a 5 inch exhaust hurt power at all in the lower RPM range as opposed to a stock 3.5 or 4" exhaust? With the extra volume capacity, i would think velocity will most likely take a hit to the point of possibly hurting power in the lower end.

I know thats alot for such a simple question, but i figure id attract more knowledgeable people to answer my question, and be on the same page intellectually, and possibly weed out the people that will just give an answer of "i don't know, it shouldn't" or something along those lines.

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Quote:
Originally Posted by alberta 7.3 View Post
Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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post #2 of 11 Old 06-17-2010, 02:24 PM
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post #3 of 11 Old 06-17-2010, 02:27 PM
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i dont know, it should ha ha i jk jake you be over tomorrow???

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post #4 of 11 Old 06-17-2010, 02:27 PM
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Short answer. Yes you will lose low end power by going with a 5 inch exhaust on a stock injectored and turboed truck

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
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post #5 of 11 Old 06-17-2010, 02:28 PM
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Actually you may even lose a little low end by going to a 4 inch exhaust. But not enough to be overly noticable

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
http://nolimitfabrication.com/
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post #6 of 11 Old 06-17-2010, 05:17 PM Thread Starter
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Quote:
Originally Posted by YodersStrokin96 View Post
i dont know, it should ha ha i jk jake you be over tomorrow???
Idk. I'll call you in a bit when nick leaves.

Quote:
Originally Posted by Dave View Post
Short answer. Yes you will lose low end power by going with a 5 inch exhaust on a stock injectored and turboed truck
But how much? 5 horse?

BPS President

2000 F-250, forged rods, 38r turbo, BTS trans, TW tuning and Bad Night Special 50 horse Caterpillar injectors

2002 F-350, remote engine mod



Quote:
Originally Posted by alberta 7.3 View Post
Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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post #7 of 11 Old 06-17-2010, 05:32 PM
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Quote:
Originally Posted by Jake View Post
Idk. I'll call you in a bit when nick leaves.



But how much? 5 horse?
I cant give you a number but it will be noticable

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
http://nolimitfabrication.com/
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post #8 of 11 Old 06-17-2010, 07:26 PM Thread Starter
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Noticeable is bad...

BPS President

2000 F-250, forged rods, 38r turbo, BTS trans, TW tuning and Bad Night Special 50 horse Caterpillar injectors

2002 F-350, remote engine mod



Quote:
Originally Posted by alberta 7.3 View Post
Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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post #9 of 11 Old 06-18-2010, 03:25 PM
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Just put 5" on my truck last weekend, it is noticeable, and i also have a banks 1.0 exhaust housing...stock tune........

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post #10 of 11 Old 06-18-2010, 03:27 PM
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FWIW, I saw a loss of low end when I put my 4" exhaust on. Its not even a 4" dp either. Now that I have my tuner it does not matter though

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