I was going to drop this argument b/c I am sick of it but I got two more pm's while I was at work today with people explaining to me how a turbo system removes the cats and that turbos are very efficient.

The argument is does a turbo increase your highway gas mileage. My stance is that obviously a 240ish whp Z gets better gas mileage than a 360-390whp Z. The people who argue against me claim their computers on the Z show they are getting higher gas mileage (as much as 20% better than NA) and since they have removed their cats and can cruise at 70mph at a lower rpm (than NA) they get better mileage on the highway.

I argue back saying the computer on the Z is designed for stock fuel injectors and once you swap them out you can't count on the readings it gives out. I also argue if these kits are really giving as high as 20% increases in your highway mileage why not advertise that as an advantage of the kit?

So people who know more than me; whats the right answer... should every environmentalist be driving around in a turbo'ed Z to save gas or is this just a glitch in the Z's computer when you swap out the injectors.

I wouldn't mind hearing from any reps out there (MIAPLAYA) to put an end to this debate. I have my hat here ready to eat if it turns out I am just ignorant and don't know what I am talking about... God knows I have been wrong before.

 

Im getting better gas mileage now that i removed my cats and had my motor built. Thats only when i stay out of boost though. Lower compression motor should result in better gas mileage. I mean the difference isnt huge but a little bit better. And all of this isnt by reading my trip computer, ditched for defi gauges. This is all by me seeing how many miles i get on a tank of gas.

 

my digital readout averages 16mpg, about same as before i installed the hks sc. however, i was always in upper rpms before the install, and now i try to stay lower to conserve gas. i used to use 6th gear very rarely. now i'm in it whenever possible.
as to the gauge's accuracy based on the change in injectors, i have no idea. good question.

 

i thought high compression = better gas mileage cause the engine is more efficient?

 

12 miles avg

 

Holy crap. My milage has gone up about 5 mpg.

 

The computer's mileage is way off - just like you said it's the new injectors. I've tested it several times and it's usually about 5 mpg too high.

 

doing 60 i get 28 mpg, city i get about 20, or so. vortech sc, headers, test pipes and borla td exhaust

 

I got about 30 mpg on the highway on my trip over Thanksgiving.

 

They do get better mileage when cruising on the freeway.

Under boost and city driving, Hellls no. But on the freeway i average 30 or better.

The computer is Drunk. Because it uses calculations to generate that and since we changed the Fuel pump, lines, and injectors, it can't calculate correctly.