Q4 gearbox

[#84]

Ok,

I have found the part numbers to be wrong and Kepsus has got the corrections. I have also corrected the part numbers in my previous post and corrected the gear ratios.

Correct:
774 51 53 and 608 11 731
37/30 - ratio

Please be aware that there are many references to my posts in this thread and that thse references still have the wrong information.

So, how could it get that wrong? Well, I searched in the Fiat ePER database for gearboxes to the 2.0 litre 16V Lampredi engine and found for the Lancia Delta HPE HF (which I knew had higher 5:th gear) some useful information for the TB model. Since I didn't check any engine details I didn't realise that the TB was a small SOHC Fiat engine found in the cheapest Lanica models. The turbo version was listed under 1750 cc 132 c.v. of some strange reason. The workshop who made the upgrade must have found the part numbers to be wrong, ordered the correct ones, but did never tell me. So, as you can see, the gear ratio is also a bit different 37/30 instead of 39/31.

Sorry.

[wrinx]

Thanks for the update

wrinx

[kepsus]

yeah thanks, anyone buy my old wrong gearwheel :-D

[Evodelta]

Throw it into Sweden, it may hit #84 on the head.

[kepsus]

lol Sweden so close to me.. i can try

[Ditlev]

yeah thanks, anyone buy my old wrong gearwheel :-D

I have two cheap gears too.. :/

[arjunior45]

Ok,

I have found the part numbers to be wrong and Kepsus has got the corrections. I have also corrected the part numbers in my previous post and corrected the gear ratios.

Correct:
774 51 53 and 608 11 731
37/30 - ratio

A little bit of help needed, from all of you whom just made this mod - not just from Andreas.

Can someone tell me how many engine rpm drops do you see changing from the 4th to the 5th gear, keeping speed inalterate?

Thanks

Nick

[arjunior45]

Did anyone do this mod, using Delta HPE HF 5th gear with the part numbers mentioned previously by Andreas?

I had a little search and according to what I found, both Alfa 155 Q5, Lancia HPE HF {'93 - '99}, FIAT Coupe 16VT and Lancia Delta Integrale have the EXACT SAME RATIO {0,917} for the 5th gear!!!

How can they have the EXACT same ratio {according to their manuals} using :
- Q4 : a 32/35 teeth gears
and
- HPE HF : a 30/37 teeth gears?

[arjunior45]

p.s.

according to a French friend of mine {with an HPE HF} his car use the same gearbox with the FIAT Coupe 16VT!!!!

[arjunior45]

new infos about.

Only the Lancia Nuova Delta HPE HF of 1999, mounts the 'longer' 5th gear {and the 2,5 Turbo Diesel} and gear ratio is 0,811 {according to Lancia's owners manual}, very close to the 30/37 teeth. All the earlier Lancia models {Integrale included} mounts the same gear ratios as our Q4 and FIAT Coupe 16vt.

Parts cost {here in Greece} are 191 and 155 - total 346 euro.
Hope part numbers mentioned by #84# are correct and they will arrive before Christmas here in Greece.

[Q4-Dave]

Will order these as well,
Already have the strengthening plate fitted.

Anyone had any problems after this mod, shouldn?t be any but just asking anyway.

cheers

[Steve Webb]

Have you got hold id these parts yet Dave?

[Q4-Dave]

I have sorted out that they can be ordered from my local Alfa Dealer, but have not ordered yet as I thought the price was very high!? approx 200Euro/each, so I am still looking about for better price elsewhere..

Maybe I´ll order them soon if I can´t find them anywhere else..

[Steve Webb]

Ouch, is that €200 per gear? Thats an awful lot of money for a couple of lumps of metal. Not sure where else you will be able to get the parts from though. If you are going to do this modification you will want the peace of mind that comes from genuine Fiat Spa parts.

[RMB-Racing]

Hi Steve aka Webmaster!

Can we please move everything in this post that's not about ny gearbox, into another post for itself, as this post actually is about my gearbox project?!!

Thanks.. ;o)

[Steve Webb]

I've moved all the recent discussion about longer 5th gears over to its own thread now.

So how did your rebuilt gearbox hold up?

[RMB-Racing]

I've moved all the recent discussion about longer 5th gears over to its own thread now.

So how did your rebuilt gearbox hold up?

Well, actually I dont know...

The project have been stranded for a couple of years. So the car haven't been on the road yet...

But hey - I have finished some rust job on the buttom of the car, and have painted the buttom.. ;-)

Next step is sandblasting the suspension components and repainting.