sti 6 speed or ppg box
 

hi all i have been offered a 6 speed box from an 06 sti 2.5 which seems to work out the same price as a ppg 5 speed box am i still better sticking with ppg for my 2.35 classic road car or is the 6 speed a good option ?


cheers david

6 Speeds can be had for around half the cost of PPG.

6 Speed is a good option if you’re not planning on quarter mile racing or trying to save every last kg. For a road car its good fun and as above can be had for a reasonable prices, i would however go for the UK with longer ratios.

If not mistaken a 2.5 STi will have "forester ratios" and will have longer gearing than an earlier UK 6 speed.

You need to get the gearbox code to confirm what its out of but mine is:

DW-TY856WG7KA

and has the following ratio's:

1: 3.636
2: 2.235
3: 1.521
4: 1.137
5: 0.891
6: 0.707

Reverse: 3.545

Final Drive: 3.900

Which gives these speeds (on my tyre sizes)

just had to decide the same myself, ppg straight cut is what i went for, but mine is a weekend toy and i love the whine from it ;)


i had exactly the same choice to make about 5 months ago.

replace with a standard/rebuilt box £600 ish, not good if your going for more power

6 speed £1800+ strong, but some people don't like the ratio change

5 speed helical or striaght cut ppg box £2700 strong as you can get

6 speed helical or straight cut ppg box £4700 strong as you can get

finaly option is prob nearer 8-10k and thats a full dog box,

PPG gear set and dog gear engagement system, its not cheap, strongest type of box you can get, but you have to double clutch

the PPG kits would use my existing 5th gear for the top gear to keep it nice and quiet for cruising.


in the end i went for the the ppg straight cut box, and have to confess i love it, the sound when you welly it is fantastic, i've got to the stage where i some times don't even notice it.

heres a little video of it taken from out side, mines the blue classic early on, but you can tell from the noise as i drive past then leave the road :D

Video of Scooby crescent - Photobucket - Video and Image Hosting

thanks all yeah the 6 speedbox im thinking about is the same ratio as the sti forrester

I *need* one of those gearboxes :luvlove:

lol, they are pretty cool,. take some getting used to though

Dog boxes do, but once you have it sorted the super-fast cluthless shift are so so rewarding :D
We have one in the slyline, PPG 5 speed straight cut Dog, and about to put one in my TimeAttack car, PPG 4 speed helical cut dog.

Learn more here
PPG - The Performance Gearbox
or
Pfitzner Performance Gearbox

pmsl, and care to mention the cost? lol was told roughly 8-19k lol

bear in mind most gearbox's like mine with ppg straight cut kits arn't Dog box's, the dog box refers to the dog engagement system, adn you have to double clutch to shift a true dog box ;)

Double de-clutch? I dont even use the clutch with the Dog box, thats the whole point ;)

Prices, Retail including VAT

Gearset Price
Subaru WRX 6sp Dog Group N................................£5,946.17
Subaru WRX 6sp Dog Group N (5gear set).................£5,416.72
Subaru WRX 6sp, 4 gear DRAG (dog box)..................£3,722.47
Subaru WRX 5sp Dog Group N.................................£4,807.85
Subaru WRX 5sp 4 Gear str-cut (dog box).................£2,954.77
Subaru WRX 5sp 4 Gear helical (dog box)..................£3,060.66
Subaru WRX 1/2 str-cut (dog box)...........................£1,710.56
Subaru WRX 1/2 helical (dog box)............................£1,710.56
Subaru WRX 3/4 str-cut (dog box)...........................£1,366.41
Subaru WRX 3/4 helical (dog box)............................£1,472.30
Subaru WRX 5sp 4 gear str-cut (syncro)....................£2,372.37
Subaru WRX 5sp 4 gear helical (syncro).....................£2,372.37
Subaru WRX 1st & 2nd str-cut (syncro).....................£1,392.89
Subaru WRX 1st & 2nd helical (syncro).......................£1,392.89
Subaru WRX 3rd & 4th str-cut (syncro)......................£1,101.69
Subaru WRX 3rd & 4th helical (syncro) .......................£1,101.69
Subaru WRX 1/2 Billet Selector fork (5sp)....................£307.51
Subaru WRX 3/4 Billet Selector fork (5sp)....................£307.51
Subaru WRX 5/R Billet Selector fork (5sp)....................£386.93
Subaru WRX Interlocker (5sp)....................................£439.87
Subaru WRX LSD (front) (5sp)...................................£863.43
Subaru WRX LSD (centre) (5sp) (99 on)......................£1,075.21
Subaru WRX 1/2 Billet Selector fork (6sp)....................£333.98
Subaru WRX 3/4 Billet Selector fork (6sp)....................£333.98
Subaru WRX 5 spd RWD Conversion Spools (99 on)........£402.81
Subaru WRX 6 spd RWD Conversion Spools...................£402.81
Subaru WRX Bronze Speedo Gear................................£185.73
Subaru WRX 3rd/4th & 5th/Rev Billet Syncro Hubs..........£254.56

pmsl, yeah and thats just the kit, let alone building and fitting etc, fun option i'd admit, if you have the cash lol

Slightly off the essence of the thread, but i drove a helical synchro ppg on a race track and it was really nice, almost stock feel.

I have driven also a dog semi-helical and you do have to slam the gear lever very fast. Quite something, but surely, never for any appreciable road journey, esp in traffic.
I think you really need billet forks for the dog also, and clutch change downshifting to get reasonable miles between rebiulds.

Several people are now fitting straight synch to 1.2.3rd, helical to 4th and stock 5th.

This will be the way for me in my hillclimb StiV3 (if i don't sell it soon :D )

Not sure on Subaru gearbox builds, but for a nissan we have had a customer who bought bearings for under £100, build was £150, fitting was £80, that still doesnt take you to anywhere near the figures your talking about.

Helical syncro kit should feel just like stock, but with more power handling capability.

Why do you need to double de-clutch a dog box? - the idea of a dog box is NOT to use the clutch except when starting & stopping.

Some misguided info re dog boxes.....

PS Dave / Rob at API has some recent knowledge of fitting and repairing 'true' dog boxes ;)

well can only go on the rough quotes i got, as soon as i found out rough figure of at least 4K plus i didn't look any further, how much would the selectecor forkes be? and building a box for that cheap? well dunno where you went cos i got th3e same figure from about 5 different companies as far as fitting and building the box.

and would you want to be driving all the time having to ram it into gear even if going slowly?

whats the benefit of 1,2,3 straight ,4th helical and uk 5th?

Strongest/strongest/strongest/nearly the strongest but quiet on the road/ stock noise on the motorway!

I recently drove a 5 speeder ppg with helical synchro 1/2/3/4 Stock 5th and it was like a stock 5 speeder, really nice.

Straight cuts sure do whine but are robust and sound great to many!

i thought it was 1/2 staight and 3/4 helical cause 1/2 and 3/4 come in pairs

is tidgys a straight cut then?for that noise alone its worth the money!

I will be getting the helical kit done in my P1 by the end of the month at Zen Performance.

lol, yeah mines straight cut 1-4 and then the normal uk 5th gear to keep it nice and quiet and resonable revs for motorway, works ratehr well i must admit

[.s. the whine in the video is from the straight cut box ;)

What was the noise on the ppg you mention above 911? I know the straight cuts whine but what about the helical synchro ones? What sort of torque would this box take?

You dont need to be forceful with the dog box, it doesnt require strength to shift, just a fast an positive action for full bore clutchless shifts. When youre driving normally you can shift slowly without any problems.

Just dont put it into neutral whilst driving as youll not get it back into gear without a godaweful CRUNCH and lots of wincing as a result. I learnt the hard way!

Straight cuts whine quite a lot, dog or sychro shift. The ppg helical I drove sounded like a 40K mile stock 5 speeder, ie normal.

Shifting a dog box simply means shifting the lever fast, no great effort, just fast. Odd at first not using the clutch but the speed of shift is very quick.