F16 CR / Non CR

[white2lSR]

Possibly a stupid question but how can you tell the difference between the CR and normal boxes? Im after a CR box and dont want to buy the wrong one lol

I presume its a case of checking the numbers???

[matt_vaughan]

Yep numbers

[white2lSR]

What am i looking for?

[Welsh Dan]

http://www.xen0phobiak.f2s.com/novaload/endplate.jpg
http://www.xen0phobiak.f2s.com/novaload/forsale/gearbox1.jpg

Passenger side at the bottom. It'll be C for close or W for wide ratio, followed by the final drive.

[white2lSR]

Spot on thanks. Now i just need to find one

[Ernie]

cheers for that.I will look to see what is on my track car as dont know.
Thank you.

[Dod]

Cav 8v SRi's had them standard. There a good strong box as well.

[Philsutton]

Cav 8v SRi's had them standard. There a good strong box as well.

just as strong as the F20 / F18s :confused:

[Jay]

Whats top end on f16cr box, 134mph or something ?

[Dod]

just as strong as the F20 / F18s :confused:

Yeah. F18s have the whole Diff bearing Failure thing.

So why would the F20 be any stronger than the F16?

[Nick]

This might strike me as a completely stupid answer...

But the 20/28's were fitted to engines with more BHP and Torque than the f16 boxes; by vauxhall.

So isn't it bound to be a stronger box once it's taken out of it's application

[Dod]

Ok, on that basis the F18s should be stronger than the F16s as well, but thats not always the case. IME F16s can last as long as F20s which both last longer than F18s. I recently sold an F16 to a guy running a 180bhp Ecotec as he prefered them to both F18s and F20s and I never had an F16 give up on me.

[MyNovaSr]

134 is about the topend I get and mines a F20 cr off the SRI 130 I think.

I had a F16cr on my last 2L 16V Nova and apart front spinning the tyres to death it lasting and didnt fail.

That had same top end, 134 ish.

Weird.

[white2lSR]

Is there a noticable difference with a F16CR? if so what are they? i currenly use an F20. Its only for occasional fast road use and dosnt go far.

[MyNovaSr]

mine is always spin, spin, spin when you try and move away quick.

Ive a F20 CR, stick with what you got I say.

[white2lSR]

I thought an F20 was an F20, no CR or WR??

[MyNovaSr]

Only going on what ive been told my friend.

[Dod]

Ok from what I understand of it (and I'm sure there'll be a few on hand to correct me if I'm wrong :roll: ) but the F16 came in a WR and CR as did the F18s but I dont know of a WR F20.

I think its Stuart that has the PNG Gearbox Bible linked in his sig so have a look on there unless someone wants to comfirm anything.

[Jay]

Stu sig says F20CR, F20W5A and F20W5B ???

[white2lSR]

Is there a noticable difference with a F16CR? if so what are they? i currenly use an F20. Its only for occasional fast road use and dosnt go far.


Anyone? ive tried the 'search' but cant find any info on this :confused:

[Philsutton]

Yeah. F18s have the whole Diff bearing Failure thing.

So why would the F20 be any stronger than the F16?

why would the F16 be any stronger than a F20?

[Dod]

If you read back, I never said it was any stronger than an F20, just that it was a strong box.

[kane]

If you read back, I never said it was any stronger than an F20, just that it was a strong box.
i dont know how much this is fact or bull**** but ive been told that the numbers on the gearbox e.g f16, f20, f28 is what torques the gearbox is rated to. f16 = 160 ft lb torque f20 = 200 ft lb torque etc. . . so if this is the case the gearbox's strength and reliability will just depend on the power ov the engine. that also why a f20 will last longer on a let than an f16 will and f28's last longer than f20's. as i said i dont know if this is true but it does make sense.

[Dod]

Yes thats true, but as said, I believe the F16 to be stronger than the F18 and as strong as F20s IME, friends and fellow VX heads say the same.

[white2lSR]

This has gone completely off topic. All i want to know now if if there would be a noticable difference using an F16CR instead of an F20.

[kane]

well at least i know people arn't telling me a load of rubish then. and i do agree f16's are very good.

[kane]

This has gone completely off topic. All i want to know now if if there would be a noticable difference using an F16CR instead of an F20.

yes it would. noticable difference in acceleration. had f20 on my corsa and swaped it for f16 cr and i could tell the difference.

[16v Nova Kev]

This has gone completely off topic. All i want to know now if if there would be a noticable difference using an F16CR instead of an F20.
you should notice better acceleration due to the box having a lower final drive. or you could buy a lower final drive kit for your f20 :cool:

[white2lSR]

Some people who are offering me boxes say there isnt anything printed on the end casing or cover. Is there any other way of telling if it is a CR or WR?

[CP]

Nope without pulling the cluster cassette out of the box and counting the teeth.
Unfortunately whats printed on the outside of the box is not always whats in it.
You might be able to narrow it down to make and educated guess if you know the exact model and age of the car its out of (assuming its std). For instance I found that late plate Nova 1.4 SR's mostly had the F13CR's in them. However this doesn't always work since 1.6 GTE and GSi's could have either CR or W boxes in them with often no way of telling. The only sure way to know was to drive them flat out in 5th gear. The W boxes were usually as fast or faster in 4th as they were in 5thlol