03-24-2020, 12:11 PM
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#106
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Junior Member
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Join Date: Feb 2019
Location: Wenham, MA
Posts: 6
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Join Date: Feb 2019
Location: Wenham, MA
Posts: 6
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Cool thanks for clarifying
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04-07-2020, 01:51 PM
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#107
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Junior Member
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Join Date: Apr 2020
Location: Atlanta, GA
Posts: 1
Real Name: Daniel
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Junior Member
Join Date: Apr 2020
Location: Atlanta, GA
Posts: 1
Real Name: Daniel
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Quote:
Originally Posted by etratnyek
Cool thanks for clarifying
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Still have these for sale?
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04-07-2020, 10:39 PM
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#108
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Member
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Join Date: Oct 2019
Location: SW MI
Posts: 99
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Member
Join Date: Oct 2019
Location: SW MI
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Quote:
Originally Posted by dhughes92
Still have these for sale?
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He does not. They are installed on my 4Runner already.
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05-12-2020, 03:14 PM
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#109
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Junior Member
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Join Date: Nov 2016
Location: Philadelphia
Posts: 11
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Junior Member
Join Date: Nov 2016
Location: Philadelphia
Posts: 11
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Hello! I'm curious about these, specifically how do they manage to improve MPG?
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"Bertha" '06 V8 Limited
3" OME | Matte Bronze SCS Ray 10s | 285/70/17 BFG KO2s
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05-12-2020, 03:42 PM
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#110
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Senior Member
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Join Date: Sep 2015
Location: Kansas
Age: 28
Posts: 4,304
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Senior Member
Join Date: Sep 2015
Location: Kansas
Age: 28
Posts: 4,304
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Quote:
Originally Posted by chrono
Hello! I'm curious about these, specifically how do they manage to improve MPG?
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I would guess for the same reason they give more power, it helps to better evacuate the combustion chamber of gasses. More efficient combustion process.
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2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
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05-12-2020, 03:57 PM
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#111
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Junior Member
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Join Date: Nov 2016
Location: Philadelphia
Posts: 11
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Junior Member
Join Date: Nov 2016
Location: Philadelphia
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Quote:
Originally Posted by Inv4drZm
I would guess for the same reason they give more power, it helps to better evacuate the combustion chamber of gasses. More efficient combustion process.
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That's what I was guessing, but part of me assumes the O2 sensor would adjust for that accordingly, no?
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"Bertha" '06 V8 Limited
3" OME | Matte Bronze SCS Ray 10s | 285/70/17 BFG KO2s
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05-12-2020, 04:01 PM
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#112
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Senior Member
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Join Date: Sep 2015
Location: Kansas
Age: 28
Posts: 4,304
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Senior Member
Join Date: Sep 2015
Location: Kansas
Age: 28
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Quote:
Originally Posted by chrono
That's what I was guessing, but part of me assumes the O2 sensor would adjust for that accordingly, no?
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I would guess (again) that the o2 sensor sees the air/fuel ratio, and doesn't care how much air/fuel passes by. Therefore the o2 sensor should have no idea the engine has DT headers.
Technically with less efficient evacuation of gases, the gas still has to pass by the o2 sensor at some point, its just doing so more slowly. So technically the sensor still reads all the gases it would before, its just flying by faster.
That's just my explanation, I'm not an engine nerd hopefully someone else can chime in.
__________________
2005 4R Sport 4WD "The last of the V8s!" - Custom TIG'd SS Dual Exhaust - King 2.5" +2 LT. - ARB Front & Rear - 37's - Dana 60 - Build Thread
2005 Tundra 2WD Regular Cab V8 - Chopped Frame - Short Bed Swap
1977 Celica Liftback - LFX Swap - Build Thread
Last edited by Inv4drZm; 05-12-2020 at 04:05 PM.
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05-12-2020, 11:42 PM
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#113
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Member
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Join Date: Oct 2019
Location: SW MI
Posts: 99
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Member
Join Date: Oct 2019
Location: SW MI
Posts: 99
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Quote:
Originally Posted by chrono
Hello! I'm curious about these, specifically how do they manage to improve MPG?
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So, maybe I'm an anomaly, but I haven't seen a MPG improvement. It feels like it the motor doesn't have to work as hard, and it sounds great and such. But after DT longtubes, Y-pipe and free flowing catback, I'm still averaging 14.4-14.7mpg each tank like I was before install..
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05-15-2020, 03:49 PM
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#114
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Member
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Join Date: Aug 2018
Location: Denver
Posts: 103
Real Name: Calvin
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Member
Join Date: Aug 2018
Location: Denver
Posts: 103
Real Name: Calvin
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Quote:
Originally Posted by ElDuck
So, maybe I'm an anomaly, but I haven't seen a MPG improvement. It feels like it the motor doesn't have to work as hard, and it sounds great and such. But after DT longtubes, Y-pipe and free flowing catback, I'm still averaging 14.4-14.7mpg each tank like I was before install..
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Interesting. I'd suspect something else is affecting it. Mine only rose a little, but just went on a roadtrip and got 19.1 MPG, normally 18.3 for that drive. Average speed was probably around 70.
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2006 Sport Edition 4x4 V8
Bilstein 6112 w/ King 700# springs (5th clip), Toytec 2" springs in the rear w/ ICON 2.0,
CBI single hoop front bumper, Smittybilt 9500 XRC, RCI steel full skid package, 285/70r17 BFG KO2s on TRD Offroad wheels
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05-16-2020, 07:09 AM
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#115
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Member
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Join Date: May 2019
Location: 43130
Posts: 53
Real Name: @professorj2
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Join Date: May 2019
Location: 43130
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Do the headers suffer from the cracking on #1 cylinder just like the stock manifolds??? I replaced my manifolds and got a little over a year before they cracked. I don't want to keep doing it again and again. Thanks.
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06 V8 SPORT, TOYTEC BOSS 2.0 LIFT, JBA UPPERS, DIFF DROP, SWAY BAR DROP & RELOCATE, 2010+ POWER STOP CALIPERS, ENERGY SUSPENSION BUSHINGS THROUGHOUT, URD OFF ROAD Y-PIPE, GIBSON STAINLESS CAT-BACK, URD FUEL PUMP WITH EXTERNAL FILTER, K&N, XD RS3'S NITTO 255/80'S & MORE
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05-16-2020, 08:26 AM
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#116
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Senior Member
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Join Date: Jan 2015
Location: Merritt Island, Florida
Posts: 1,599
Real Name: Brett
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Senior Member
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Location: Merritt Island, Florida
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Real Name: Brett
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Quote:
Originally Posted by MY06T4R
Do the headers suffer from the cracking on #1 cylinder just like the stock manifolds??? I replaced my manifolds and got a little over a year before they cracked. I don't want to keep doing it again and again. Thanks.
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Have never heard of it. I studied header threads for close to a year and a half before I pulled the trigger on buying mine. I just re-torqued them after about 1500 miles and could only get an 1/8 to 1/4 turn on a few of the fasteners. It seems both sides are seated well and breaking in nicely. Thorley uses pretty good gaskets which hopefully will help dampen any vibration stress as well. Haven't noticed any ticking in the engine bay either, as far as cracking of the headers. I guess anything is possible, but highly unlikely.
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1988 DLX 22RE AUTO BLACK- "Granny" - SOLD
2003 SR5 SPORT V8- Build- "Pearl" You Tube 2UZ 120
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05-16-2020, 10:11 AM
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#117
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Member
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Join Date: Oct 2019
Location: SW MI
Posts: 99
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Member
Join Date: Oct 2019
Location: SW MI
Posts: 99
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Quote:
Originally Posted by Caldizzle
Interesting. I'd suspect something else is affecting it. Mine only rose a little, but just went on a roadtrip and got 19.1 MPG, normally 18.3 for that drive. Average speed was probably around 70.
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Yeah, I'm not sure what. All fluids replaced replaced with Amsoil or Redline Oils, full stainless exhaust, and my lift is mild (1.5" front, 1/2" rear) to fit 32" Fallen ATs. New front calipers didn't fix it either.
Unless torn CV boots will hurt MPG. Have new ones sitting in the garage.
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05-17-2020, 11:52 AM
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#118
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Member
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Join Date: Aug 2018
Location: Denver
Posts: 103
Real Name: Calvin
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Member
Join Date: Aug 2018
Location: Denver
Posts: 103
Real Name: Calvin
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Quote:
Originally Posted by ElDuck
Yeah, I'm not sure what. All fluids replaced replaced with Amsoil or Redline Oils, full stainless exhaust, and my lift is mild (1.5" front, 1/2" rear) to fit 32" Fallen ATs. New front calipers didn't fix it either.
Unless torn CV boots will hurt MPG. Have new ones sitting in the garage.
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Hmmm, I wouldn't think torn boots would affect MPG too much...maybe .1 or .2, but even then I wouldn't know for sure. To get the basic stuff out of the way, when was the last time you checked your air filter or did your spark plugs? It may be worth it to clean the MAF as well to eliminate that. Are your tires properly inflated? Any signs of a wheel bearing going out? That dropped my MPG a solid 1-1.5 MPG until I fixed it.
I was skeptical of the MPG gain when purchasing these, but settled on the fact that if I had any it would just be an added bonus. Definitely not a pickup of 2 MPG, but like I said, I did have some marginal gain.
__________________
2006 Sport Edition 4x4 V8
Bilstein 6112 w/ King 700# springs (5th clip), Toytec 2" springs in the rear w/ ICON 2.0,
CBI single hoop front bumper, Smittybilt 9500 XRC, RCI steel full skid package, 285/70r17 BFG KO2s on TRD Offroad wheels
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05-17-2020, 04:12 PM
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#119
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Member
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Join Date: Oct 2019
Location: SW MI
Posts: 99
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Member
Join Date: Oct 2019
Location: SW MI
Posts: 99
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Quote:
Originally Posted by Caldizzle
Hmmm, I wouldn't think torn boots would affect MPG too much...maybe .1 or .2, but even then I wouldn't know for sure. To get the basic stuff out of the way, when was the last time you checked your air filter or did your spark plugs? It may be worth it to clean the MAF as well to eliminate that. Are your tires properly inflated? Any signs of a wheel bearing going out? That dropped my MPG a solid 1-1.5 MPG until I fixed it.
I was skeptical of the MPG gain when purchasing these, but settled on the fact that if I had any it would just be an added bonus. Definitely not a pickup of 2 MPG, but like I said, I did have some marginal gain.
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Yeah, I wasnt banking on the MPG gain, but added bonus as well.
MAF and TB cleaned, filters, fluids all synthetic, air pressure in new tires up to 35, OEM plugs done, been through all of it.. no hum or any signs of bearing failure.
Not really sure. Thought it was winter gas too, but hasn't improved. All mpg hand calculated off mileage (correcting for tire size) and same Shell pump. Lol.
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06-17-2020, 12:04 PM
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#120
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Member
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Join Date: May 2017
Location: Ontario
Posts: 43
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Member
Join Date: May 2017
Location: Ontario
Posts: 43
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Anyone here have a audio visual of the result of DT headers of a 4.7V8?
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2008 4Runner Limited 4.7 V8 Limited, XREAS & Rear Air bag, Nautical blue metallic
2005 4Runner Limited - 4.7L V8 Sold
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