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Gearboxes - straight cut etc


Rush Motorspork

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Rush Motorspork

Now the car is tantalisingly close to be back up and running I’ve put in a CAPEX request to the wife for a new gearbox. 
 

 Currently have a uprated type 9 built by first motion. Engine is a reasonably high power (somewhere around 250) reasonably high revving (8500) Duratec. I don’t know the torque figures. Exclusively track use now but will be keeping it “road legal” for if I ever come to sell it. 
 

I did consider a sequential, but I’ve now ruled that out on the basis that I’d rather be having fun mastering Heel n Toe etc than chasing tenths. 
 

I want something strong that will take lots of trackday abuse without complaint, so I’m left with:

 

1. Further uprated synchro road box of some kind - I think I’ll always have a nagging doubt over its longevity. 

2. Straight cut box - This is the favoured route I think. Does anyone have any experience? I know they are loud but are they “that’s a cool whine” loud or “ping the noise meter on a track day” loud?

 

3. Dog engagement - I don’t really know much about this, but a straight cut dog box seems like the ideal solution, in terms of strength and speed of changes (indeed relishing my driving like a throbber)

 

Experiences welcome, especially from the sprinting crowd! 

 

 

 

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wizzer

I've got one of these

https://www.tracsport.com/gearkits

only done road work not had any problems with it, stronger than straight cut, and Steve perks told me it would outlast a quaife straight cut on track 

Tony 

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I don't know how uprated your current box is..but I think if you are making around 250 bhp at 8k I would think a good uprated type 9 would be fine and last for ages..how often do you hear of one failing..

Mine is the same as Wizzers..and the builder says he has them running in much heavier torqier cars than ours and not had issues..many in rally cars that really get abused....

I don't think you need to change for reliability issues...

Now if you want a six speed or want to change for other reason then that could be a different matter!!

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stephenh

Another vote for Steve Perks Tracsport 'boxes. Ideal for high powered Duratecs. 

 

Edited to add that the reason they are particularly good for high reving high power engines is that the internals, although type 9 based have lighter gear sets and better bearings on the shafts than the Ford originals, so you can go for a synchro 'box, but it will still cope well with fast gear changes, because the internals can speed match much better than the originals, being lighter and having better bearings, so less wear and tear on the synchro rings. At least, it worked for me on my Duratec, and that was over 270 bhp, and reved to 9k., and used regularly for sprinting.

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Rush Motorspork

This all sounds good to me. Ill stand down until it breaks then! Thanks everyone!

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Andrzej

I had to take similar decision lately. 

Talking to drivers who had a chance do drive synchronised and dog boxes, the the conclusion was that dogbox is the way to go for track use (assuming similar costs of dog and a special-heavy duty synchro) . 

1. dog rings should be stronger (due to thickness and straight not helical gears)

2. straight gears cause less stress on box case 

3. straight gears means less power/torque loss than helical

4. dog engagement allows (in fact they say it _needs_ very fast ( "bang" ) operation to be reliable) 

4. gear changes are faster. 

 

 

Parking maneuvers they said to be more difficult (?) something witch changing from 1st to reverse for example, and not possible or not recommended changing from for example 2nd to 5th when easy driving . But for the track car if the box should be stronger, faster and smooth on fast drive then I think is worth it. Hope I'll see if this all is truth for myself next season .

 

And one more - the linkage between the gear lever and box should be really ( not sure the right words ) "stiff", rigid, precise , with no play at all.

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Steve (sdh2903)
3 hours ago, Rush Motorsport said:

This all sounds good to me. Ill stand down until it breaks then! Thanks everyone!


id still keep the CAPEX request in ;)

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Rush Motorsport the 2nd
13 hours ago, Steve (sdh2903) said:


id still keep the CAPEX request in ;)

Having spoken to @Rush Motorsport the CAPEX request is still in place, just redistributed to other "essential" upgraditus 😂🤣

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AdamR

Lionel 3?

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Rush Motorspork
17 minutes ago, AdamR said:

Lionel 3?


Rush Motorsport HQ has ran out of space! 

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Ben(EBD-ENG)

Adopt some new members of Rush Motorsport and use there space lol

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Rush Motorsport the 2nd
19 minutes ago, Ben(EBD-ENG) said:

Adopt some new members of Rush Motorsport and use there space lol

@Rush Motorsport ben has space he told me at cadwell

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Ben(EBD-ENG)

Lol I have no space. If I did I'd be joining the Lionel brigade

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Rush Motorspork

Lionel is happy to live outside. 
 

I do have some 4 “visitors” spots I could do a hostile take over on

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Dog Engagement

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QBE22Z

Ford Sierra (Type 9) 5-Speed Dog Engagement Gearbox with Alloy Maincase and Gear Lever

In stock

POA

Prices start at £3,930.00 for base gearbox.
Optional extras include nylon gear knob and REM superfinished gears.
Please email sales@quaife.co.uk for all enquiries and orders.

The QBE22Z is Quaife Engineering’s 5-speed dog engagement Ford Sierra Type 9 gearbox, suitable for classic Ford models including the Escort Mk1/2 and Sierra. Available only as a complete assembled unit, QBE22Z is designed as an outright competition gearbox, with the latest four dog open face design to ensure ultra-rapid, positive gearshifts, while the layshaft is assembled using separate gears.

To ensure reliability, the QBE22Z features free running gears supported by precision needle roller bearings. An alloy maincase, alloy top cover and Quaife gear lever are supplied as standard fitment.

Rated to a maximum of 250bhp, QBE22Z features power loss minimising straight-cut, close-ratio gears in a wide choice of motorsport orientated gear ratios.

Key features of the QBE22Z Ford Sierra Type 9 5-speed dog engagement gearbox include:

• Straight-cut, close-ratio dog engagement gears for rapid shifts

• Needle roller bearings support mainshaft gears

• Large choice of motorsport gear ratios

• Includes Quaife gear lever, alloy top cover and maincase

• Choice of input shaft length for numerous installation options

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