hi Ive been offered a carb zx9r for good money

whats peoples verdict on these they seem to have a good power output?

ta chris

Depends on the model really, B's are the oldest ones, easily identified by the generator being externally mounted under the carbs, good power output but heavier than the later models. C & E's look the same and give similar power outputs, the E's have a slighly stronger gearbox. All good engines especially if cheap. My E gave around 128hp at the wheels with dynojet and freeflowing air filter/exhaust.



Originally posted by zxrlocost
hi Ive been offered a carb zx9r for good money

whats peoples verdict on these they seem to have a good power output?

ta chris

hi mate 1999 zx9r c2?

Weakest gearbox from what im lead to believe.

been in a ZX9r Indy and it was quick enough for sure though

Good strong engines with good power, early gearboxes slightly suspect possibly, but apart from that a cracking engine.

Cheers

Alex

ok is the gearbox thing easily overcome at a later date

ta chris

Dont know if the later gear boxes are a direct replacement for the weaker ones but i doubt it.

Dont know if anyone offers an uprated gearbox for them?

If not then just keep an eye out for spares

They're quite low geared though, so you'll need quite a high ratio diff....

Chris, if the engines cheap dont worry too much about the box, plenty of peeps have had no problems using the C in becs. My first engine was a C, when it blew up (dont ask) i stripped it for spares and the box was fine.
I once read on a US site that someone over there does a kit to uprate the box, something to do with better ident pin springs?

ok everyone thanks for the advice

so what ratio would I need

ta chris

3.62 and 15" wheels is ok, although you will hit the rev limiter in top on long straights (donnington) fine for road use tho.
Iv'e now gone to 3.14 with 13" wheels.
3.38 would be a good allrounder.


Originally posted by Coose
They're quite low geared though, so you'll need quite a high ratio diff....

I've got ZX9R 'E' in my car and it is a cracking engine!

I have been told that the gearboxes are a direct replacement from 'C' to 'E' but don't know anyone who has done it. I have an absolutely mint 'E' gearbox in my garage looking for a new home!

I've never really noticed the difference in gearing compared to other cars I have been in. I run a 3.62 LSD and think it is OK.

so what happens when you go higher than 3.62

it all gets confusing

do you mean higher gear as in 3.38 & 3.14 ?

or lower gear (but higher number) such as 3.92 ? (i.e. std 4cyl sierra)

either way, use one of the gear ratio calculators:
http://www.gearboxman.co.uk/inforatios.html
http://www.quaife.co.uk/Motorsport

I'm sure someone here can tell you what ratio's the gearbox has to make these work

sorry yeah I meant higher numbers like 3.89 ta chris

Hi just remember that whith the escort axle the highest ratio you will get is a 3.54 wich is not quite high enough for the zx9.
With 15" wheels you will not get to 120 mph cant remember the exact figures but worth looking to see what others have as a top speed with thier gearing.

cheers matt

hi so the chap who reckons hes got a 3.89 live axle MK2 is deff wrong

No, 3.89 is probably the most common English axle ratio. It's a lower ratio diff than the 3.54, though the number is bigger. It relates to the number of turns on the input of the diff giving 1 turn of output - the smaller the number the higher the ratio!