Hello everyone,
I was quite keen on throwing a second gen busa engine in my MNR Vortx due to the extra 20hp however I have recently been informed that the gears are
narrower than on the first gen. This is a problem because the cars primary use will be autox where there are hillclimb type starts so first gear needs
to be stout.
Would it be wise for me to use the first gen engine? Are there any easy fixes to make up for the power deficit? I will have an extra $1000 due to the
cheaper first gen engines.
Is the busa really the correct choice in the first place? I thought it would be smart to have 100lb-ft due to the fact that I will often have a
passenger aside me in the MNR, but autox is dominated by very low sleep technical turns (under 70mph) where overall weight can be more important than
power (for example an r1).
Thanks for any and all input
if its tight and twisty the extra torque of the busa should help. as for the gearing, i have no idea sorry!
The Hayabusa has a vast array of tuning option available. I believe you can even buy different ratio gear sets. It may be an available option to buy the Gen2, and then buy a different gear set
My 1ts gen busa was fine, it stood up to the standing starts, but i broke a propshaft and an output shaft on the freelander diff. and that was only
using toyo road tyres in the dry.
quote:
Originally posted by ffrgtm
I thought it would be smart to have 100lb-ft due to the fact that I will often have a passenger aside me in the MNR, but autox is dominated by very low sleep technical turns (under 70mph) where overall weight can be more important than power (for example an r1).
Thanks for any and all input![]()
Whilst the effect on torque of gearing is absolutely true, I would suggest that the available spread of torque from a hayabusa is of more
significance. If you do not need to change (or concentrate on changing) as often, times will be better.
As for the robustness of gears, I believe a Gen II will be fine. It seems to be the output shaft that is upgraded first and I believe these are the
same across the generations.
The other difference on the Gen I/II is the starter motor which you will need to change on the Gen I if there is a risk of spinning which it sounds
like there is!
There are quite a few of us hillclimbing without modifying the gear train including people running 1500cc derivatives.
[Edited on 13/4/11 by Rustybin]
Thanks for the info guys! Think I will go with a gen II then. What's this about spinnin? The gen II requires no modifications then?
oh and fwiw the gen II has a slightly larger output shaft
quote:
Originally posted by ffrgtm
What's this about spinnin? The gen II requires no modifications then?
FYI-
The Busa starting system was actually changed in 2003 not GEN II. The 2002 and earlier engines can and should be updated with the 2003 parts.
Chet
[Edited on 14/4/11 by Chet]