Flowmaster 40, all 4 cats taking off? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 08-19-2010
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Flowmaster 40, all 4 cats taking off?

Will this increase HP? also Gas mileage thanks for opinions.
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Old 08-19-2010
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No, but you must prepare for a barrage of insults and opinions regarding this.

Just put the muffler on and enjoy
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  #3  
Old 08-19-2010
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Not to worried about insults. Alot from around here have them off?
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Old 08-19-2010
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Also another question about a 8 bar behind back window sick of the thought of throwing my 4wheeler in to hard and busting a window anyone have any suggestions?
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Old 08-19-2010
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I took of the last cat and ran a flowmaster Original 40 series 3" inlet 2.5" dual outlet sounds good to me and about 500,000 people on youtube check out the vid in the drivetrain page. you take off all the cats you will loose too much back pressure and the mpg's will suffer
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Old 08-19-2010
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Quote:
Originally Posted by 03 DEMON 4X4 SOHC View Post
you take off all the cats you will loose too much back pressure and the mpg's will suffer
totally false. as long as the exhaust system is well designed so that scavenging of the exhaust gas is maintained bp is a nonfactor.
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Old 08-19-2010
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Originally Posted by ES894x4 View Post
totally false. as long as the exhaust system is well designed so that scavenging of the exhaust gas is maintained bp is a nonfactor.
explain that in stoopid ppl terms for me please?!!
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Old 08-19-2010
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i have no cats and a 50 series and i really like it, a 40 series with no cats can be a little too raspy with too much drone
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Old 08-19-2010
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Originally Posted by ES894x4 View Post
totally false. as long as the exhaust system is well designed so that scavenging of the exhaust gas is maintained bp is a nonfactor.
Very good.

Actually backpressure SHOULD be minimized, but you want to keep the flow fast. Backpressure usually increases flow so it is a double edged sword.
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Old 08-20-2010
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Well I'm not just taking them off with out a new o2 censor without that the whole computer from fuel will **** up. it wont be to rich or to lean.
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Old 08-20-2010
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Well I'm not just taking them off with out a new o2 censor without that the whole computer from fuel will **** up. it wont be to rich or to lean.
No. The fuel trims will NOT change. The truck doesn't care if there are cats or not, it only wants to see a difference in the two 02 sensor readings for emissions. The first ones do the fuel trims, the last one just wants to see a difference.

Use a de-fouler. You can buy them at most autoparts store. I think its 18mm. Buy two of them, drill the inside of one out to fit the 02 sensor tip in, and bolt them both together, and then put the entire assembly into the exhaust pipe. Search on google, there are several how-to's.
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Old 08-20-2010
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No. The fuel trims will NOT change. The truck doesn't care if there are cats or not, it only wants to see a difference in the two 02 sensor readings for emissions. The first ones do the fuel trims, the last one just wants to see a difference.
Very good grasshoppah..

Quote:
Use a de-fouler. You can buy them at most autoparts store. I think its 18mm. Buy two of them, drill the inside of one out to fit the 02 sensor tip in, and bolt them both together, and then put the entire assembly into the exhaust pipe. Search on google, there are several how-to's.
Don't give an 8 year old matches to play with...
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Old 08-20-2010
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haha wow brings back memories. If you do break it, you can always get plexi glass!
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  #14  
Old 08-21-2010
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All right all done 40 series no cats. everything checks out sounds great, a bit to raspy so gonna get a glasspack but other than love it do feel a bit more power though not gonna lie.
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Old 08-21-2010
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Originally Posted by Jeriziah View Post
All right all done 40 series no cats. everything checks out sounds great, a bit to raspy so gonna get a glasspack but other than love it do feel a bit more power though not gonna lie.
you more than likely have less power
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Old 08-21-2010
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Originally Posted by Jeriziah View Post
Also another question about a 8 bar behind back window sick of the thought of throwing my 4wheeler in to hard and busting a window anyone have any suggestions?
ummm maybe dont RIDE it into the bed lol. jk. i do it too. theres some nice headache racks available...

lol and just a few weeks ago i saw a guy with a BRAND new f250 do just this....not gonna lie i laughed. but i was extra careful on the throttle when i was loading up after seeing that :)
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  #17  
Old 08-21-2010
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Originally Posted by Jeriziah View Post
All right all done 40 series no cats. everything checks out sounds great, a bit to raspy so gonna get a glasspack but other than love it do feel a bit more power though not gonna lie.
Video?
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  #18  
Old 08-21-2010
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No There's no less power. How is that even possible?
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Old 08-21-2010
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Originally Posted by Jeriziah View Post
No There's no less power. How is that even possible?
You don't understand exhaust design, and you didn't measure before/after yet your saying "no there's no less power"...
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  #20  
Old 08-21-2010
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You think i just went underneath and started cutting away? its the same exact line 2.5 inches to the headers.
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  #21  
Old 08-21-2010
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And NO THERE IS NO LESS POWER LOL
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Old 08-21-2010
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wowzers
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Old 08-21-2010
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And NO THERE IS NO LESS POWER LOL
How would you know - you haven't measured anything.
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  #24  
Old 08-21-2010
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  #25  
Old 09-07-2010
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Hmmmmmmm raspy as ****...
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