Lets say you have an 96-00 Civic. Under the hood you got a d16y8. You get your hands on the most economical 1.5L D series engine you can find. Build it for mild boost, and swap it into your car along with a small turbo. Tune for reliability and aim for 150-200whp.

With a long enough transmission, would it be possible to get some sick hwy mpg while still retaining enough useable torque/power to have fun? Discuss.

 

its possible...but i'd keep the y8


Modified by bmoua at 8:05 PM 6/27/2008

 

Wouldn't you want a bigger turbo? to keep it out of boost at hwy speeds.

 

boost is all throttle dependent

 

Keep the Y8, D15's are too much of a hassle to build up compared to any D16....Or at least it was for me......

 

I read an article a few years ago about a guy who put a screw compressor on a D and threw it in a hatch and was making 175-200whp and gettin north of 35 MPG. I'd go with a good blower cause its a little easier to keep the reins in. Turbo cars i think are a bit touchy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boondocks1805 &raquo;</TD></TR><TR><TD CLASS="quote">Keep the Y8, D15's are too much of a hassle to build up compared to any D16....Or at least it was for me......</TD></TR></TABLE>

Just curious, why are d15's harder to build?

 

fuel economy and hp/tq are on oposite ends of the spectrum, the more power your want, the more fuel you are going to need

 

As long as you use an appropriately sized turbo and a competent person tunes the car w/your needs in mind, yes you can still get good gas mileage. Just keep the engine you have and put some headstuds in, no use in building a D15.

 

ask this question on d-series.org for more in detali answers.

 

all that fcking work and cash, just to make the power of a b16 AND get the same gas mileage as a b16? f that ****.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by count me out &raquo;</TD></TR><TR><TD CLASS="quote">all that fcking work and cash, just to make the power of a b16 AND get the same gas mileage as a b16? f that ****.</TD></TR></TABLE>

You have to be one of the most negative people I've seen on this board...every post by you is something negative, you dont like, you dont agree with, etc.

The last time I checked, the B16 did not make 150-200whp nor does it even have that amount in torque (Hence the reason they call it the torque less wonder). NOT TO MENTION, it's no fun!

Lastly, what work? Building a car/motor is supposed to be fun and enjoyable, not work. We work (which is the unexciting part) so we can enjoy our cars and what we build. I just got done building my entire motor, painting my car, and piecing together a monstrous turbo setup that took me a year to complete. Every bit of it was enjoyable

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by del sol1658 &raquo;</TD></TR><TR><TD CLASS="quote">Wouldn't you want a bigger turbo? to keep it out of boost at hwy speeds.</TD></TR></TABLE>

You don't go into boost just because your RPM's are higher on the highway. A turbo will only spool under acceleration load...when not accelerating, it goes into Vacuum

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by count me out &raquo;</TD></TR><TR><TD CLASS="quote">all that fcking work and cash, just to make the power of a b16 AND get the same gas mileage as a b16? f that ****.</TD></TR></TABLE>

The goal is to make more power than the b16, way more torque, and better gas mileage too.

 

Theoretically it would be true that a small turbo would make your motor get better fuel milage.as seen with alert of smaller sports cars that are coming out recently, alot of them have turbo's a turbo motor is usually more efficient than a n/a motor thus why they make more power on the same displacement

build your motor for power in the 1500 - 4500 range where you do most of your driving. So a really Small turbo would do well. when your just cruzing you won't be in boost till you need the little extra power to pull you up a hill so you will be using less throttle

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Frickr &raquo;</TD></TR><TR><TD CLASS="quote">Theoretically it would be true that a small turbo would make your motor get better fuel milage.as seen with alert of smaller sports cars that are coming out recently, alot of them have turbo's a turbo motor is usually more efficient than a n/a motor thus why they make more power on the same displacement

build your motor for power in the 1500 - 4500 range where you do most of your driving. So a really Small turbo would do well. when your just cruzing you won't be in boost till you need the little extra power to pull you up a hill so you will be using less throttle</TD></TR></TABLE>

That would be good if it was just for daily driving power but is it for racing then that will suck BAD! no matter what when you add a turbo you will see less mpg you add more fuel becues you add more air.

you would have better mpg and more power compaired to a bigger displace ment engin.

If you are going for power when racing then I would choice Nitrous your motor is not using more fuel till u hit that little switch.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Colby71 &raquo;</TD></TR><TR><TD CLASS="quote">
no matter what when you add a turbo you will see less mpg you add more fuel becues you add more air.
</TD></TR></TABLE>


Yes/no. If you are driving in vacuum and a compenent person tuned the car, there should be no change for the worse. If in boost, yes, but its not the end of the world.

My last tank of gas was 100 miles town/200 highway and managed 36mpg...and this is still w/a 4.250 final drive and only driving in vacuum.

 

turbo=higher thermal efficiency, not worth going to a 1.5 as there isnt much difference from the 1.6.

driven with the PROPER techniques, turbo charging can increase FE

Boost pulse and EOC glide = high mpg

I'm working on a 200hp d16y5 that should get 60 mpg


Modified by Vince64 at 3:38 AM 6/29/2008

 

I am currently building a D15B7,aiming for 320-350 WHP.....Prior to the build I was getting 50.2 MPG......I will not be getting anywhere near this once the buld is complete. The only reason I am building the D15B7 is because I have 4 of them in my shop and I am tired of fooling with K Series. The D15B7 is harder to build because some parts are only interchangable with Certain D16's. Although all D Series engines have the same bore size, other parts come into play....i.e. cam,crank,valve train, none of these are interchangable with the D16's and hardly anyone makes parts for them. I am fabricating the majority of my own parts, what I can fabricate will be done by my dad or a really good friend both of which have been doing this type of stuff for 20+ years......If you decide to go with the D15 and have any questions feel free to ask.......

 

I'm doing this with my d14z2 and a T25. It will increase FE, as long as you can keep your foot out of boost.

SAAB has been doing this for a number of years, and so has Volvo and several other European makers.

I'm collecting the turbo parts right now, and as soon as they're all together I'll report back. Estimates are that I'll increase FE by 15-25%.

 

sounds sweet