Morning does anyone think this might be a good idea?
Removal of the air con pump, and getting a shorter belt just to run the alternator? Having slightly less drag on the engine making it easier for it to run with less ancillaries?

 

If you're not using AC, the pump has a clutch which makes almost zero drag on engine. You can gain 0,001 mpg because of removed weight.

 

How about a longer geared tranny..?

 

Ah I see, not enough to compromise taking out in that case then

 

^^ what other trannys would fit? I've got the F22B dohc engine, n the gearing isn't all that great, sat at 60mph in 5th gear it's at 3000 rpm

 

I'm not to familiar with the F-series engine series.. But I wonder if they make a B-series tranny conversion kit. Just some food for throught. I'll do a little research on this..

 

Best thing would be a proper tune up and make sure your car is running in great shape.

 

fair play, I'll try and find some info too, n yeah it does generally run like a dream until recently and a few components failed on me, power steering pump, harmonic balancer/crank pulley, exhaust. got a brilliant service history but has covered a few miles now, about 196000 kilometres so :/ but still pulls really well, should have the rest of the parts this weekend and have it back on the road again

 

That's what I like to hear. If you "could" do the B-series tranny swap, a longer geared tranny should improve your MPG.

 

 

Yeah that would be ideal, I dont have a clue about these ratios on the post I just posted, its all just numbers to me lol, but longer ratios definitely makes sense to improve fuel economy going to have to spend a bit of time looking for a way to do it, or find out if its possible

 

Would defiently help! May be worth looking into!

 

Yeah for sure, my gearbox is the M2J5 so whatever the ratios mean on that table... gonna have to get on looking into it

 

JDM Si tranny? Well that's a "performance" tranny. You could downgrade to a longer geared tranny but I would just keep your Si tranny. What kind of MPG are you currently getting?

 

I see companies make a H2B adapter plate which lets a H/F series engine be mated to a B series engine. So researching this plus looking into a longer geared tranny would accomplish what your wanting! See if this H2B adapter plate will work for your Prelude. A little researching goes a long way.

 

Yeah, jap import like, and is it the performance tranny? even more I didn't know about the car lol... and not brilliant, maybe 20 round town, and not much more than 30 at a push on a good run down the motorway sitting at 70-80 mph, the exhaust has been blowing for a while though, so weather getting that replaced will help or not I'm not sure, doesn't sound nice blowing either way tho

 

True. Well an Si is above a base model. Looking at that chart it does look like their might be a couple trims above this Si though.

 

https://honda-tech.com/forums/hybrid-engine-swaps-18/h2b-no-adapter-plate-kit-qs-2828357/ this seems quite interesting, seems like its able to be done so.. but then if its a good box I've got, its all decisions with cars, fuel economy or performance lol.. never get both in one car

 

Never get both! Pick and choose!

 

Correct me if I'm wrong. I'm pretty sure F series transmissions bolt up to H series engines? If so, my Accords transmission would bolt up to the Prelude engine. I like the gear ratios on it. Cruising at 60 RPMS are I believe under 2500.

 

I would do a tune up and make sure all systems are functioning properly.

I get 27-28 combined city/highway, spirited driving, VTEC, etc. with an M2F4 transmission and no EGR.

But if you want 30-40 mpg, get a civic to DD.

 

M2J5 is not a performance transmission. Look at those gear ratios.