Hopefull fitting the above gearbox and matching diff into my 1993 wrx import. Should i notice any real difference to the gearing i.e are the ratios much shorter in the P1 compared to mine and would the shorter gearing help my 1/4 times?

Also is there anything i should be aware off before hand. Ive already been informed by harvey (thanks harvey) that the P1 has 6 fixing bolts where mine is only 4 but is there any other issues i should be aware off. i.e are all the 5 speed cluches the same as mine is an uprated exedy one and is only a year old so depending on condition was hoping to reuse it.

cheers all

drew

 

dont know about the p1 box but my type R box is close ratio'd a head to head with my typeR and a p1 both standard mine was slightly quicker off the mark over a quarter mile might be the same and difference was down to driver tho

 

P1, 1st thru to 5th change at 8000rpm
41
69
100
134
176

std wrx 1993 change at 7250
36
61
86
115
151

I dont think you will notice any difference. IMHO

 

i thought the shorter ratios on the P1 would of helped gettin a good start of the line

 

P1 gearbox is longer than what your original is

 

Are you saying there above that the P1 will do 176mph??

 

Given the power, theoretically.

 

so the only real benefit from the upgrade would be that they are stronger boxes.

 

anyone know of any other benefits other that the casing being stronger?

 

Thats about it other than the internals will no doubt have less fatigue due to the fact they are newer.

 

what box would actually be better a v4 sti one or a P1 one?

Cheers for info

Drew

 

It depends what you want.

 

im just looking the strongest box possible to try and last till i can save for a ppg

 

Most seem to think a late 54 type casing.

 

My 95 wrx stripped 3rd with no warning. Not running big power either........

 

arnt the P1 a type 754 casing?

 

The P1 has a 4.44 diff and .738 5th gear, same as STi 5 or STi6.
Your early WRX could have a 4.11 diff or a 4.44 subject to transmission code but it also has a .825 5th gear.
In effect the P1 box gets to 100 kph in second gear while the WRX has just gone into third.
3,4 and especially 5th are that much longer in the P1 compared to early WRX and the theoretical top speed at 8,000 rpm, subject to tyre size is in the order of 170 mph. I do not have the exact figures in front of me but it is something like a theoretical top speed 30 mph up on the early WRX.

 

so the P1 box is a good upgrade over my standard one then?

i thought the P1 box was like a short ratio RA box with just a longer 5th so it would of been quicker off the start.

 

The P1/STi 5/6 box is stronger than any O/E 752 box but it will not improve 1/4 mile times. They may be slightly slower but the advantage is less frantic high speed cruising.

 

so fitting the P1 Box is good for safety as its stronger but it may slow my 1/4 times down

Then again with the xtra safety of the stronger box i could up the power