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Originally Posted by harvey
(Post 10355506)
Where can I find your boost characteristics? A graph with torque/boost/revs otherwise I don't know what I am talking about.
Subarus MY93 to 98 had TY752 gearboxes. Subarus MY99-00 had TY754 gearboxes with a much stronger casing which prevents flexing of the gearshafts. The TY754 gearbox was then carried on for New Age five speed. (Designations changed at a later date but the strength of the box 754 onwards is a mega improvement over the 752 which were easy to damage). Any box TY752 or TY754 with a VB reference is a Jap box and VN relates to UK/Europe. UK/European boxes have a 1.1:1 drop gear so the front diff generally is 3.9 and the rear diff 3.545. The Jap boxes have a 1.0:1 drop gear ie. the same gear, no conversion so Jap cars may have 4.44 front and rear, older ones may have 4.11 front and rear and you can even have 3.9 front and rear. The 6 speed gearboxes are stronger again and superior to the TY754. Oh by boost characteristics I mean after doing the 4th gear and see when I get a bar test you told me to try. Do you think it's a bit late achieving 1 bar at 3500rpm and full boost around 4000rpm? |
The TY754 is a lot stronger than a TY752. I don't know what you have previously.
The power your gearbox will stand will in part depend on how you treat it but you know what I achieved with plenty drag starts and 11 second quarter miles. You are running a TD05 16G and I would expect that to boost well before 3500 rpm in 4th gear. Typically 3200 to 3300 if not before and full boost 500 rpm later. |
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