Well I had a little extra time on my hands this month so I thought it would be a good time to do some dyno runs. I'm not claiming to be an expert at engine tuning nor on the products tested so take this material for what it's worth. I have a crewmax 4x with the 5.7L engine with almost 9k miles running Mobile 1 oil. My truck has bigger tires so for you who think the numbers are lower than expected take that into consideration. I had asked the operator of the dyno if the tires made a differance and he didn't think it would make much. I had a number of pulls performed on my truck with different configurations. Another thing to keep in mind is our elevation here is just over 1000 ft above sea level.
1) Stock truck
2) K&N cold air intake with the stock exhaust
3)K&N cold air intake with a JBA dual exhaust
4)K&N cold air intake with a JBA dual exhaust and opening a vent between the Mass Air Sensor and the Throttle Body.(to try and lean out the truck)
My personal experience is that the K&N made a noticable differance in drivability and performance. I think this mod was worth the money.
The exhaust would have worked better if their was a way to lean out these trucks (programmer, adjustable mass air sensor, etc) as for drivability with the exhaust I feel that fuel consumption has increased without running the truck any different.
On one last note GO TRIBE......
__________________ 07 Black Crewmax 5.7 4X4 FE, BU, CK, DZ, AA, HM, MG, CF, SIRIUS, K&N CAI, SMITTYBILT SIDE STEPS, SMITTYBILT BULL BAR, TRUXXX 3" FRONT 1" REAR LEVELING KIT, BFG 305*65*18's, JBA DUALS, CHROME HANDLES...BLAH..BLAH..BLAH....
Nice to see some actual back to back runs. Kinda puts a little hiccup in the old, CAI are useless, posts. (makes me feel better about buying mine and though mine is ona Tacoma I am thinking it is still worth more than just the cool sound...lol)
so 17 hp and 15 tq with a intake and exhaust? Not bad I guess. But i agree these trucks need to be tuned bad
Those numbers are at the wheels remember, so it makes them look even better. Thanks for proving what I knew all along, but many others doubted. I did nearly this exact same thing with my V8 4Runner but in addition, I tuned the air-fuel ratios as well. I got the same results as you. Larger gains with the intake, but a little more power with exhaust. I agree, they do need tuned as well -- 11:1 at WOT is pretty rich...
When you say " I feel the fuel comsumption has increased", do you mean the vehcile is burning more fuel, or getting better MPG??
__________________ 2008 Tundra CrewMax Limited 4x4 5.7, White w/ oak leather, Moonroof, NAV, Factory 20's, XM.
2006 Nissan Murano SE Black, Loaded, Black leather, 20" Dubs
2005 Corvette C6 (#581) Coupe 6 spd Black, Loaded, Black Leather, Navigation, XM, Onstar, HUD, F55 Magnetic ride, Z51 Brakes/calipers/sway-bars, Route 66 Exhaust, Intake, Custom Tune, 160 stat. Only 2 runs at the track...12.4s @116mph
Those numbers are at the wheels remember, so it makes them look even better. Thanks for proving what I knew all along, but many others doubted. I did nearly this exact same thing with my V8 4Runner but in addition, I tuned the air-fuel ratios as well. I got the same results as you. Larger gains with the intake, but a little more power with exhaust. I agree, they do need tuned as well -- 11:1 at WOT is pretty rich...
Great job, Thanks for sharing this with us.
One last thing. Go Rockies!!
The 11:1 ratio is probably a little lower in reality. Instead of removing an O2 sensor and using a wide band sensor to get a true reading we used a sniffer attached to the dyno so we would not get a check engine light on the truck. The dyno operater felt the actual reading should be near the 10's.
__________________ 07 Black Crewmax 5.7 4X4 FE, BU, CK, DZ, AA, HM, MG, CF, SIRIUS, K&N CAI, SMITTYBILT SIDE STEPS, SMITTYBILT BULL BAR, TRUXXX 3" FRONT 1" REAR LEVELING KIT, BFG 305*65*18's, JBA DUALS, CHROME HANDLES...BLAH..BLAH..BLAH....
When you say " I feel the fuel comsumption has increased", do you mean the vehcile is burning more fuel, or getting better MPG??
I have noticed about 2 MGP less in fuel economy department and that's not using the display on the dash, but using a calculator plus adding in for the tires. My mileage after tires and pre engine mods was around 17.1 now it's around high 14"s to low 15"s.
__________________ 07 Black Crewmax 5.7 4X4 FE, BU, CK, DZ, AA, HM, MG, CF, SIRIUS, K&N CAI, SMITTYBILT SIDE STEPS, SMITTYBILT BULL BAR, TRUXXX 3" FRONT 1" REAR LEVELING KIT, BFG 305*65*18's, JBA DUALS, CHROME HANDLES...BLAH..BLAH..BLAH....
im impressed with the over all increase in the area underneath the curve more than anything.... thats a massive improvement....more power sooner in the rpm range
I have noticed about 2 MGP less in fuel economy department and that's not using the display on the dash, but using a calculator plus adding in for the tires. My mileage after tires and pre engine mods was around 17.1 now it's around high 14"s to low 15"s.
that doesnt make any sence at all
__________________ 07 Salsa Red Pearl 5.7 DC..TRD, Leather, JBL radio. MODS: Readylift...20 inch chrome Ultra Goliaths...Nitto Grapplers 305/55/20...Volant Intake...TRD Shifter...Led's
The only logical explanation for a catback exhuast causing a decrease in fuel economy is that your putting your foot in it more because you like the sound.
I absolutely cannot believe what the K&N appears to add in the midrange. It appears too good to be true.
The only logical explanation for a catback exhuast causing a decrease in fuel economy is that your putting your foot in it more because you like the sound.
I absolutely cannot believe what the K&N appears to add in the midrange. It appears too good to be true.
+>50hp at 3500 rpms!!!!!!!!
Actually K&N's dyno runs seem to show the same type of curve and no I'm not putting my foot into it more for the sound, but like I said before Take it for what its worth. I just thought some people would like to see some real data.
__________________ 07 Black Crewmax 5.7 4X4 FE, BU, CK, DZ, AA, HM, MG, CF, SIRIUS, K&N CAI, SMITTYBILT SIDE STEPS, SMITTYBILT BULL BAR, TRUXXX 3" FRONT 1" REAR LEVELING KIT, BFG 305*65*18's, JBA DUALS, CHROME HANDLES...BLAH..BLAH..BLAH....
MODS+DYNO Results
07 Salsa Red Pearl 5.7 DC..TRD, Leather, JBL radio.
Linear Mode
