evilamish

I would like to downgrade the 2.0l to a 1.7l some year. Well there is three reason I would like to do this is. The 2.0l has a lot of miles (230k I'm afraid it might go out soon), I need something with good gas mileage (that where the 1.7 comes in), and the last part I love the body style. The biggest question, is this possible and if so what would i need to do this?

toyomatt84

iTrader: (1)

It'd be a huge waste of money. D17's are one of the most unreliable D-series platforms out there. Why not invest in some transmission upgrades? TSX 6th gear and a 4.0 Final drive will bring down your fuel consumption.

importrule

you should look into doing the full tsx swap with the 6spd. it's possible to get 30+ on the manual 04-07 tsx... with a lighter car, you should easily get mid 30s....

i'm not sure how much mpg you're looking to get... but full tsx swap would work.

evilamish

I was look for 30 around the city. I'll look in to that. Thanks guys

Jujutsuka

An engine swap for gas mileage?
wow. Now i've heard everything. I don't know how you will afford a brand new engine and swapping it. If you can't afford the gas mileage a K20A3 offers as long as you don't go everywhere in VTEC.

JRCivic1

That swap could be done... but the cost would offset your gas mileage savings for the next 20 years !!! Low mileage K20A3 engines are a dime a dozen... I bought one yesterday for $300 with 112K on it out of a base auto RSX. Your best course of action is to make a transmission change... either by dropping the final drive down or switching to a tall 6 speed set. If you have a bit more $$$ to play with, the TSX swap mentioned above also makes sense. A more powerful engine requires less throttle input to accelerate the car as you are accustomed to, and thus, burns less fuel. Combine that with a lower sustained operational engine speed (RPM) at highway speeds, and you get better fuel economy.

importrule

yea.. that's one of the main drawback... but, if you're already in the market for a new motor... it's not a bad idea.

with fuel injection systems, fuel usage are based on engine load, and that is usually measured by throttle input. with more available torque from the bigger motor, you can have similar amounts of acceleration with less throttle input, thereby lowering the engine load, and potentially lower fuel usage. a friend of mine had a h22a vtec swap in a eg civic a loooooong time ago. the EPA rating for preludes were about 20 city, 25 hwy... he was getting 35mpg. weight difference between the 97-01 prelude and the 94 civic ex coupe were about is about 400 to 500 lbs.

so, with the tsx at roughly 3200 lbs, you should get better gas mileage if you're not smashing on it all the time.

JRCivic1

importrule, I think you are agreeing with me there. LOL

Don't forget that the TSX transmission has a few issues when compared to the EP3 transmission... it is not a "drop in" or "direct replacement" swap.

The transmission mount is different because the three mounting holes/studs are not in the same locations when comparing the TSX and EP3 transmissions. In addition, the VSS is driven off of the differential on the EP3 transmission... and driven off of the input shaft in the TSX. Correcting the VSS low frequency/high frequency issue requires an electrical VSS converter and some wiring to make your ECU and your instrument cluster happy. You will also need to address a way to operate the reverse lock-out solenoid... or be SUPER careful when shifting into 6th gear. There are also a few minor wiring changes on the longblock, but nothing to really fear.

importrule

oh yea, i was just reinforcing the idea, JRCivic1