I have a greddy ti (which we all know is pretty loud), but i recently put the silencer in it and was surprised by how quiet it made the car during highway and street driving. I didn't get on it so i don't know how much HP i lost due to putting the silencer in, but what really surprised me is how the MPG has improved. I took a long road trip (700 miles) and the car gave me 28 mpg. Before it would never go over 22-23.

Also are there any ill effects on the turbo or engine of going WOT or driving with a silencer for an extended period of time?

thanks

 

Was this just that one incident or have you duplicated it yet?

Evo's have very inconcistent MPG's. Well at least thats what I noticed with mine. Every once in blue moon I hit 27-28 MPG a few 24's and then its mostly 20-21 MPG's.

Let us know if your MPG's repeat.

 

and there is your answer

 

haven't driven the car much since, but can tell you from the 700 mile trip i made that it was repeatable as i filled up 4 times (don't do the math because i'd fill it up even with a half tank remaining). but keep in mind that i was cruising in 5th for majority of the time and was not beating up on the car. but i've done this before too on long 200 mile trips and i have never seen mpg more than 22-23. this was the first time that it did 28mpg. btw the car has 68K miles on it so it's not a breaking in thing either.

 

Pretty much the reason got 28mpg, is because you were doing all Highway driving and were staying out of boost. On multiple 600+ mile trips I've seen around 340-360 miles per tank, staying out of boost and cruising between 65-80 mph. Which equates to 24-25 mpg, since the gas tank is roughly 14 gallons. So at 28 mpg, your going like 392 miles on a tank.

As for ill effects of driving at wot with the silencer, you shouldn't have any problems, except much decreased gas mileage at wot lol.

 

i do mostly highway driving and i still only get 24 at best. i guess pass too many cars :P

 

Blocking the exhaust will slow efficiency and therefore decrease milage considerably


Increased chance of preignition, decreased chance of horsepower. Overall a BAD thing

Probably reason for improved mpg

Does your digestive system work when constipated?