Corsa Maxi rally car

[lee303]

Thanks Lee, pictures would be great.

Azmi

will get some when i'm next up there(probably tuesday) and put them up in here if robert doesnt mind

[robertkassner]

Not at all mate

[lee303]

[azzmi]

[azzmi]

Hello Mates,

I have just overhauled my gearbox (Quaife six speed dogged, F13). Where can I buy some gears and drive discs in England? Do Quaife supply them? (I couldn't see anything about that in their website). Actually, I am not sure if dogs are over worn or usable for a while more. I can send the pictures of the dogs if you kindly interest.

Best Regards,

Azmi

[lee303]

quaife do sell the parts needed, they should have the part numbers stamped on them too, always best to ring them though, how worn are the dog teeth?

[robertkassner]

Yeah, Quiafe sell direct - need to ring them. They are not the best though! Really slow i found.
Also itll be worth getting the big nut as you nearly destroy it when taking it off.
i had to change my 1st 2nd and dog selector on mine recently (F20), came to about £500!!



This is a damaged one to compare with yours the teeth are fine - just the selector bit is damaged. The edges shouldn't be rounded off like that. This will eventually cause it to jump out of gear.


rob

[azzmi]

Thanks,

I made my list with part numbers for 1,2,3,4 gears, related selector discs and LH threaded locknut. In contrast of jumping out of a gear (I did so many lift-offs on the extremely bumpy road even a single time it didn't jumped out.), my problem is engaging a gear especially a quick gearing down is needed. My clutch is disengaging well, but to engage a gear, sometimes, I have to apply an excessive force to the gear selector stick or "tune the engines RPM". Some pictures of the gears,






Regards,

Azmi

[lee303]

those symptoms just sound like a normal dog box to me tbh, you must match the revs well to get the gear to engage, and even to allow the old gear to be released
anyway here you go azzmi, the gearbox reverse inhibitor

like i said, its a sprung loaded device that picks up on the reverse gear shaft through the reverse switch hole, looks like this when you have pulled the bowden cable back

which you would do with a bike lever or similar attached to the gear levers shaft, fits here


when the cable is loose it presses into t ashoudler on the reverse shaft that stops it moving, so you cant get reverse whatever you do

[azzmi]

Thank you Lee,

Actually there was one more question on my mind that, do I make something wrong? Of course I prefered to keep it there. I hope you are right about it comes from nature of my gearbox. But I still would like to know your comments about the dogs worn.
Reverse gear inhibitor is great, thank you. As soon as I make mine I will let you know.

best wishes,

Azmi

[lee303]

its a bit hard to say from the photos, as you need to see the gear faces with the recesses too, but they look 'used' rather than badly worn to me, do you clutch on the up shifts?

no worries on the inhibitor, you can see the shoulder on the reverse gear shaft that it locates to in the first of your photos

[azzmi]

I always use clutch both up and downshifts, as I mentioned, this is my first dogbox I have only made 30 stage miles on it. I used to drive standard synchromesh gearbox for many years and maybe in this while I gained some bad habbits for a dogbox.

Even if I change all the gears and everything, after the first start from this point they will start to be worn out again. I mean, I like to use any expensive part as long as possible. So that makes me curious and asking everything that I found doubtful. (I believe that is the spirit of the forum).

I checked the shoulder, thanks again Lee,

Azmi

[lee303]

absolutely!
as for the box, i think you just need to get used to matching the revs, synchros make it all so easy!lmao

[azzmi]

This advice is worth to 1000 £ (remember, 1,2,3,4 drive discs etc.)

[lee303]

lmao

[donlop]

Thanks,

I made my list with part numbers for 1,2,3,4 gears, related selector discs and LH threaded locknut. In contrast of jumping out of a gear (I did so many lift-offs on the extremely bumpy road even a single time it didn't jumped out.), my problem is engaging a gear especially a quick gearing down is needed. My clutch is disengaging well, but to engage a gear, sometimes, I have to apply an excessive force to the gear selector stick or "tune the engines RPM". Some pictures of the gears,






Regards,

Azmi

if it jumping out of a gear it sound like your problem is your Engine mount is to soft
my dokbox is a f 20

[azzmi]

Yeah, Quiafe sell direct - need to ring them. They are not the best though! Really slow i found.
Also itll be worth getting the big nut as you nearly destroy it when taking it off.
i had to change my 1st 2nd and dog selector on mine recently (F20), came to about £500!!
This is a damaged one to compare with yours the teeth are fine - just the selector bit is damaged. The edges shouldn't be rounded off like that. This will eventually cause it to jump out of gear.

rob

Hello Rob,

Did you change them because of they have symptoms or just precautonary? If so, what was the gearbox problem when driving?

all the best,

Azmi

[robertkassner]

Azmi,

Just bought the box, so decieded to check it before i fitted it as it was second hand. Was told that i would be doing this repair every 2-3 events

I too will be using the clutch to shift gears. Looking on those pictures they are ready as the edges of the 'sticky outy' bits are rounded off.

how do you change gear? As you have to be very fierce!
Also what sort of power are you running? Maybe upgrade to a F15 or even F20?


Thanks

rob

[azzmi]

Hello Rob,

Since I live in Turkey it is a bit hard to import a new (even if it is used) gearbox. I think both F13 and F15 use the same gearkit.
In my opinion F20 is ideal to handle the modified engine power. My current engine has throttle bodies, MBE 967 management, double valve springs, titanium caps, 284 in 280 ex cams with vernier pulleys WITH STANDARD pistons. I believe it makes about 140-150 BHP.
I am planning to order omega pistons from SBD by the end of the February. (My wifes cousin will bring them with her.) I also have 290-300 degrees kent cams but I am trying to take it a little easy. I Need to learn a decent driving style for this sort of car first.
By the way do you ever hear that the cams that I am currently using. (KCBJ 24 Ex 280 Deg, KCBJ 23 In 284 Deg from BJ motorsports I think)
A friend of mine said once "show no mercy to this gearstick" Sometimes I feel like the faster gearchange the less shock in gearbox.
waiting for new photos and news from you,

best wishes,

Azmi

[Rallycorsa]

I looked at dogbox but to much maintenance for me, was also told to be very aggressive with the box and pretty much ram it into gear as slower changes incurred more wear on the dogs.

Just to add why does anyoe use the clutch?? once your off the strat line ram it in thats the whole point of a dogbox isnt it?

[azzmi]

at least can we use the clutch while gearing downlmao?

[corsa-finn]

Hi Azzmi,

when using the dog box you need to forget the synchros. As you normally give time a bit for the gear to be selected (syncro ring is adusting the speed) with dog box you need to be very precise and determined. The gear should be selected with one "clock noise" only. Do not let it rattle at all when shifting as the connecting teeths will be worn very quickly causing the gear to jump off. You can shift very rapidly with dog box even without clutch when you are left braking. Most important is the rhytmus to use the box and to get the connection correct.

[argi]

Hi
do you know anyone that using a tractive sd906 seq gearbox?It is the only homologated for corsa and i haven't found anyone using it .Why?

[argi]

After jan 2009 a rally car must retain all original mounting points when not already logbooked. Or so i was told anyway.
Doing this might have caused me problems. I think rear turrets are out of the question to.

rob

If you look at the homologation papers there is a picture of "alternative use of rear coils"
or something like that,so i think that if it is homologated to use the coils as there are in the picture you could make the rear turrets so that they can be fitted.
If you know something else please inform because i am building a corsa and i have allready made them.

[rydamadam]

hi mate,

great build qaulity of build is amazing, just wondering what bumpers you are using, i have wide tracked my xe corsa to 50mm each side and are looking for wider bumpers to suit my arches.

thanks

Adam