Plenum Inserts...WOW
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
Plenum Inserts...WOW
Riffraff sent me a pair of intake plenum inserts. Admittedly, I did not install them right away because I didn't think I needed them ASAP. I finally got them in last week and WOW! I got a 4MPG boost.
I wasnt getting the right mpg but I noticed the decline the same time I got my larger tires (and the odometer has Ben corrected) so I wrote it off as that. But now I'm up from 14mpg to 18mpg! I have been commuting the same route for several weeks and its all freeway, with minimal other driving. I knew 14mpg freeway with a 50 mile one way commute sucked, but what was I to do?
I'm dumbfounded. I didn't even know I had any boost leaks because I could still peg my gauge around 25psi. Just goes to show how much of an effect a leak can have.
I wasnt getting the right mpg but I noticed the decline the same time I got my larger tires (and the odometer has Ben corrected) so I wrote it off as that. But now I'm up from 14mpg to 18mpg! I have been commuting the same route for several weeks and its all freeway, with minimal other driving. I knew 14mpg freeway with a 50 mile one way commute sucked, but what was I to do?
I'm dumbfounded. I didn't even know I had any boost leaks because I could still peg my gauge around 25psi. Just goes to show how much of an effect a leak can have.
Senior User
Joined: Jun 2012
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My MPG's have tanked! When I first bought the truck last spring it came with around 15-17, now after doing an HPX, FRX, new injector o-rings, fuel bowl rebuild, & hutch & harpoon mod I've dropped to around 10-11!!! I'm just hoping that I can find some time to try out my boost leak detector I made & hopefully find a bunch of leaks to explain why my mileage has gotten so bad.
Trying to Gain Knowledge
Joined: Jun 2003
Posts: 1,571
Likes: 2
From: Ezzell, TX
Just order a set and four t clamps as well. Want to eliminate any issues from that area. Now that I have the bellowed up pipes installed and the FRX. Just glad to know it helped someone else.
Thread Starter
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
My MPG's have tanked! When I first bought the truck last spring it came with around 15-17, now after doing an HPX, FRX, new injector o-rings, fuel bowl rebuild, & hutch & harpoon mod I've dropped to around 10-11!!! I'm just hoping that I can find some time to try out my boost leak detector I made & hopefully find a bunch of leaks to explain why my mileage has gotten so bad.
Laughing Gas
Joined: Aug 2010
Posts: 1,098
Likes: 6
From: Ventura co.
Your post has reminded me about a leak i have. Sorry didn't mean to jack your post trey.
I have an up pipe leak. I can only turn the bolt 2 turns out and it locks up. I can turn it in 2 turns in also and it stops. Im afraid that im going to snap the bolt off. So my guess is to snap it off and buy the bellowed up pipes.. Any other thoughts ? can't afford them right now..
I have an up pipe leak. I can only turn the bolt 2 turns out and it locks up. I can turn it in 2 turns in also and it stops. Im afraid that im going to snap the bolt off. So my guess is to snap it off and buy the bellowed up pipes.. Any other thoughts ? can't afford them right now..
Posting Guru
Joined: Mar 2011
Posts: 1,037
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From: Florida
Good news Trey. I just installed some inserts today. The holes they went into were certainly out of round before the inserts went in based on what was going on during install. It was good to be able to crank down those clamps afterward without fear of deformation.
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Don't suppose u have a link for that video?
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
more mpg is always a good thing. I am in dire need of some. I think I might go with these inserts though.
Riffraff Diesel: Riffraff Diesel Billet Intake Manifold Plenums
Riffraff Diesel: Riffraff Diesel Billet Intake Manifold Plenums
Laughing Gas
Joined: Aug 2005
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From: Port Elgin, On
Laughing Gas
Joined: Aug 2010
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From: Ventura co.
Cargo Master
Joined: Jan 2009
Posts: 2,800
Likes: 31
From: OKC, OK
more mpg is always a good thing. I am in dire need of some. I think I might go with these inserts though.
Riffraff Diesel: Riffraff Diesel Billet Intake Manifold Plenums
Riffraff Diesel: Riffraff Diesel Billet Intake Manifold Plenums
Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
I would suggest them not as an increase in mpg but piece of mind. There's no reason the inserts alone helped the mileage out aside from better clamping being able to take place.
When I swapped turbos I put a set in my truck and come to find out when I pulled the spyder apart I have a massive boost leak at the orange boot. Someone had taken it off before and didn't realign it right. I was only getting 15 pounds of boost in all my tunes.... You never know what you have to fix until your in it already... Worked out great for me
When I swapped turbos I put a set in my truck and come to find out when I pulled the spyder apart I have a massive boost leak at the orange boot. Someone had taken it off before and didn't realign it right. I was only getting 15 pounds of boost in all my tunes.... You never know what you have to fix until your in it already... Worked out great for me