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+--- Forum: XUD Section (https://www.306oc.co.uk/forum/forumdisplay.php?fid=11)
+--- Thread: hdi gearbox conversion (/showthread.php?tid=11309)
hdi gearbox conversion - RJDubya - 24-02-2013
I'm sure this has been asked on here before, I'm looking at doing an hdi gearbox conversion on my dturbo, how does this affect the driveability of the car? Do people find this better, worse, is it a noticeable change? Would you recommend it if you've done it? Thanks
RE: hdi gearbox conversion - David - 24-02-2013
I've fitted one to mine and the box gives you a long gear range. It would all depend if you do short or long runs?
RE: hdi gearbox conversion - Piggy - 24-02-2013
also all depends on your engine and target drive...
do you want long torquey gears and higher mpg for long runs or do you want a revvy high bhp quick through gears drive
RE: hdi gearbox conversion - londondan86 - 25-02-2013
Stick with the xud box unless you are doing motorway miles and trying to improve economy. The ratios are crap for town/hooning about
RE: hdi gearbox conversion - RJDubya - 25-02-2013
I'm collecting parts to do a Bosch conversion so when that's fitted and tuned I won't have an issue with power/torque.
I do a mix of town and motorway driving, are the ratios that much longer that they would cause Problems or is it just down to personal preference?
RE: hdi gearbox conversion - Piggy - 25-02-2013
its about 500rpm less per gear...
bosch conversion alone wont make a huge hike in torque like the big boys here with td04s and 11mm pumps etc
RE: hdi gearbox conversion - RJDubya - 25-02-2013
I know that :-P but once it's up and running I do plan on changing the turbo for something beefier dependant upon funds...
Think I might wait until that point to change it, will be more worthwhile when I have extra power/torque to use... Thanks
RE: hdi gearbox conversion - Ricky - 25-02-2013
I personally think the bigger the turbo, the worse it will be on a hdi box, soon as you change from say 2nd to 3rd it will drop the revs too low and drop off boost.
RE: hdi gearbox conversion - londondan86 - 25-02-2013
(25-02-2013, 12:06 PM)Ricky Wrote: I personally think the bigger the turbo, the worse it will be on a hdi box, soon as you change from say 2nd to 3rd it will drop the revs too low and drop off boost.
This! A bigger turbo will need revs to spool but with an hdi box you will be constantly shifting out of the power band
RE: hdi gearbox conversion - Piggy - 25-02-2013
depends WHAT turbo...another threads purpose
RE: hdi gearbox conversion - Ricky - 25-02-2013
Anything TD04 sized, even my GT20 wouldn't like the different ratios. VNT would be better, but then I think you will end up torturing the clutch.
RE: hdi gearbox conversion - Piggy - 25-02-2013
dt clutch with hdi gearbox for the win
RE: hdi gearbox conversion - Ricky - 25-02-2013
It's already a DT so will have a DT clutch. If you're revving to 6k all the time, you may be ok with a hdi box..