Aftermarket Exhaust - Impact on Fuel Economy?

mini_cal · 10-05-2018, 09:31 AM

Since my 370z is my daily, I try to keep my fuel economy reasonable

I drive about 150km daily mix of highway and city (~93 miles for US folk).

I'm looking into getting an exhaust system but I'm just wondering if people have noticed much of an impact on their fuel economy? Some people have mentioned doing an intake, or intake+exhaust setup has decreased their fuel economy by a bit.

I'm not looking for intense HP gains or anything. Just trying to get something a bit more audibly pleasing than stock.

Any input? Thanks!

BC416 · 10-05-2018, 09:37 AM

Your MPG will go down because you will be leaning into the throttle more to hear that sweet sweet VQ open up!

dts3 · 10-05-2018, 09:38 AM

You'll be on the throttle a lot harder to hear your new exhaust, which will impact your fuel economy

FPenvy · 10-05-2018, 09:40 AM

wait...........people actually care about MPG in a Z?

Spooler · 10-05-2018, 09:58 AM

Quote:

Originally Posted by FPenvy

wait...........people actually care about MPG in a Z?

Noop, I sure don't and I commute 104 miles a day. I pay for smiles per gallon.

FPenvy · 10-05-2018, 10:05 AM

Quote:

Originally Posted by Spooler

Noop, I sure don't and I commute 104 miles a day. I pay for smiles per gallon.

i mean my drive is short only doing 30 miles round trip but still wouldnt care if it was longer.

think my Z is avg 18.3mpg and the GTR is 18.5mpg......cant help to play with the boost. it was 19.5mpg until the weather cooled down

somms · 10-05-2018, 10:28 AM

My MPG went up after exhaust/HFC/CAI plus ecutek tune. If I stick the cruise control on 65 and drive for a few hours the dash computer tells me I get about 29-30 mpg. Before the breather mods and tune, the best I could do was about 27 mpg on a cross country trip.

That said, you will be flooring it to hear and enjoy your car. You'll also be downshifting more often to stay out of the 2000 rpm range, unless you enjoy rattling the entire car with a loud drone.

ColtronZ · 10-05-2018, 10:03 AM

The same people that care about MPG are the ones that care about paying for premium. You knew this going into the car. It's expensive but it's about the enjoyment not the price.

And an exhaust will make you even more likely to not care about MPG because then that negates the racecar.

SouthArk370Z · 10-05-2018, 10:41 AM

IF your driving habits remain the same, you should see a slight increase in MPG. But I'm in agreement with everyone else that your driving habits will change and MPG will drop a bit.

mini_cal · 10-06-2018, 11:55 AM

Haha thanks for the input everyone. It's not really "paying for fuel" thats the issue, its me being lazy to go fill up more frequently and I like having good range per tank.

Thankfully our Zs actually have pretty big fuel tanks.

Glad to know the exhaust doesn't directly impact it too much, just my driving habits might change to hear the sweet V6

10-05-2018, 09:31 AM	#1 (permalink)
mini_cal Base Member Join Date: Aug 2018 Location: Toronto, Ontario Posts: 64 Drives: 19 370Z Heritage Rep Power: 7	Aftermarket Exhaust - Impact on Fuel Economy? Since my 370z is my daily, I try to keep my fuel economy reasonable I drive about 150km daily mix of highway and city (~93 miles for US folk). I'm looking into getting an exhaust system but I'm just wondering if people have noticed much of an impact on their fuel economy? Some people have mentioned doing an intake, or intake+exhaust setup has decreased their fuel economy by a bit. I'm not looking for intense HP gains or anything. Just trying to get something a bit more audibly pleasing than stock. Any input? Thanks!

10-05-2018, 09:37 AM	#2 (permalink)
BC416 Track Member Join Date: Jun 2014 Location: NJ Age: 38 Posts: 718 Drives: 2012 KAD 6MT Rep Power: 593	Your MPG will go down because you will be leaning into the throttle more to hear that sweet sweet VQ open up! Rusty, somms, old guy and 3 others like this. __________________ F.I. / K&N / 180 / Forgestar

10-05-2018, 09:38 AM	#3 (permalink)
dts3 Track Member Join Date: May 2018 Location: Farmington Hills, MI Posts: 599 Drives: 08 Expedition Rep Power: 6766	You'll be on the throttle a lot harder to hear your new exhaust, which will impact your fuel economy envisous likes this.

10-05-2018, 10:28 AM	#7 (permalink)
somms Base Member Join Date: Jun 2013 Location: Boston Posts: 131 Drives: 2011 370z SP MT Rep Power: 13	My MPG went up after exhaust/HFC/CAI plus ecutek tune. If I stick the cruise control on 65 and drive for a few hours the dash computer tells me I get about 29-30 mpg. Before the breather mods and tune, the best I could do was about 27 mpg on a cross country trip. That said, you will be flooring it to hear and enjoy your car. You'll also be downshifting more often to stay out of the 2000 rpm range, unless you enjoy rattling the entire car with a loud drone. envisous likes this. __________________ Fast Intentions 18 inch resonated catback, Fast Intentions resonated HFCs, Stillen Gen 3 CAI, EcuTEK tune, 311whp

10-05-2018, 10:03 AM	#8 (permalink)
ColtronZ Enthusiast Member Join Date: Jan 2018 Location: Tampa, FL Posts: 310 Drives: 17 370z Rep Power: 6296	The same people that care about MPG are the ones that care about paying for premium. You knew this going into the car. It's expensive but it's about the enjoyment not the price. And an exhaust will make you even more likely to not care about MPG because then that negates the racecar. FPenvy, Spooler, old guy and 1 others like this. Last edited by ColtronZ; 10-05-2018 at 10:08 AM.

10-05-2018, 10:41 AM	#9 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	IF your driving habits remain the same, you should see a slight increase in MPG. But I'm in agreement with everyone else that your driving habits will change and MPG will drop a bit. FPenvy, Chuck33079, Rusty and 3 others like this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

10-06-2018, 11:55 AM	#10 (permalink)
mini_cal Base Member Join Date: Aug 2018 Location: Toronto, Ontario Posts: 64 Drives: 19 370Z Heritage Rep Power: 7	Haha thanks for the input everyone. It's not really "paying for fuel" thats the issue, its me being lazy to go fill up more frequently and I like having good range per tank. Thankfully our Zs actually have pretty big fuel tanks. Glad to know the exhaust doesn't directly impact it too much, just my driving habits might change to hear the sweet V6

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to keep fuel economy as histogram?	coffeebob	Exterior & Interior	6	04-05-2014 05:34 PM
Fuel Economy with a GTM TT kit!!!	bullitt5897	Forced Induction	107	05-20-2012 12:08 PM
Fuel Economy	tdd1986	Nissan 370Z General Discussions	37	09-26-2010 11:46 AM
50-75% improved fuel economy news story... 'supercritical fuel inejctors'	travisjb	Engine & Drivetrain	4	05-21-2010 11:54 AM
Fuel Economy...WTF?	spearfish25	Nissan 370Z General Discussions	28	07-08-2009 06:05 PM