DeliciousDallan

I have a manual 1997 civic with a b16b engine/tranny swap. I just bought the car about 2 weeks ago and it's supposed to be shifted at around 4500rpm. It accelerates relatively fast, but if I'm going just 70 on the freeway then it's at like 4500rpm in 5th gear, which is just burning gas for no reason. How do I change that so I would shift around 2800-3000 rpm. What would I have to buy/do and about how much would any parts cost? Also my vtec engagement rpm is 6100 rpm and I want to lower that too to 4300-4500rpm.

slowcivic2k

The cam profile is created at a specific ROM for a reason. If you want enormous lift buy a 5.0l Ford. A 1.6L can only do so much. If you do not understand this, use another engine.

The B16 type r is geared the way it is for a reason. If you are a highway guy a B16B is not the way to go. Buy an Integra LS and go home. You cannot have maximum acceleration and fuel economy at the same time, it is a change-off.

Of course you can modify it, but why? The B16B is a very desirable transmission. If you want to turn it into a Si/ w/long 5th buy an Si or a GSR.

LTCxD2B

I'll trade u my ls trans for ur type r trans lol 70 @3500-3700 rpm

B20VtecVillain

First off, a Civic type R swapped build was not the best way to spend your money if you were looking for fuel economy as your main goal. Secondly, what do you mean by "supposed to be shifted at 4500" and why would you want to bring your VTEC crossover point that low? I think you would benefit from doing a little research on your own, but the cliff notes for you are as follows:
1) you have one of the shortest gearboxes Honda offers, and also one of the most sought after. It was not built or designed for for low highway rev's
2) Before you consider modifying your tranny, look up what you have and its value and you will surely see that selling it to purchase a different trans and putting some money back in your pocket is a much better option.
3) Spending money on a chipped ecu and then tuning so your Vtec crossover is below 5,000rpm is just plain silly. It would be beneficial to nothing, neither performance nor fuel mileage. Your cam profile and the nature of the B16 in general dictate that high rpms are where the power is made. No matter how much money thrown at it, it will never be an engine making peak TQ in the low RPM range and again it was never designed to fill that slot.
You have a unique drivetrain in your vehicle and if you don't understand/appreciate that then it simply is not the right vehicle for your needs.

94EG8

You can swap in an LS 5th gear which will lower the RPM a few hundred RPM. Sometimes it winds up giving you worse mileage. That engine is very happy at 4500RPM on the highway and honestly fuel mileage has more to do with throttle position than it does with RPM.

m4xwellmurd3r

B series engines in general seem happiest around 4k rpm. I have a b16 cable trans in my integra and average 28+mpg and I flog it all the time. If I try and get good mileage I get around 30-33mpg. I could tune it a little more and get more mileage but im fine with it.

Just keep the setup or have it rebuilt with a taller 5th.