Hdi gear box advice

[Cbray2003]

Just looking into this really wat difference would a Hdi gear box on and xud do as someone told me its a big difference to the speed any advise welcome as need a new clutch anyway so if any gd will change box at same time thanks

[andywhy]

Lower RPM in 5th at 70 than an XUD box so better economy when cruising from what I've read.

[Piggy]

the search button must be broken...fix it mods!

it changes each gear ratio due to a different final drive.

so each gear is about 500rpm lower than the xud box at same speed

[Arron]

Id recommend one - had one in my last DT. Changing gear too much with the DT box; ratios are silly short imo, the HDi box isnt much better, but the DT box will feel more involving when driving spiritedly.

In short - Go for the HDi box

[RJDubya]

the search button must be broken...fix it mods!

Thats what i thought... I've asked about it and im sure numerous other people have too

[silverzx]

If your in the minority and own a XUD purely for economy then the HDi box is a must, it'll pay for itself over time with the saving in fuel.

If your in the majority and own a XUD with the intentions of modifying then a XUD box is shorter which should give you better acceleration in theory.

[Chris_90]

and to add if you do alot of town driveing can drive at 30 in 5th carnt do that with the hdi box but hdi box is good for motorway driveing.

[Oil-burner]

That makes no difference whatsoever to economy chris

[Cbray2003]

thanks a lot for the advise ill prob fit the Hdi box seams got it apart thanks a lot

[Marcus1991]

Does anyone know what clutch to use when doing this mod. Xud or Hdi clutch?

[MarkTD]

XUD clutch I think

[Chris_90]

That makes no difference whatsoever to economy chris

Dose it not?? thought it would as on a motorway at 70mph with a d turbo box your doing nearly 3,000rpm, hdi box 2,500rpm surely that 500rpm less over an hour drive would save you fuel??

[Marcus1991]

That makes no difference whatsoever to economy chris

Dose it not?? thought it would as on a motorway at 70mph with a d turbo box your doing nearly 3,000rpm, hdi box 2,500rpm surely that 500rpm less over an hour drive would save you fuel??

I think he ment doing 30mph in 5th

[Chris_90]

That makes no difference whatsoever to economy chris

Dose it not?? thought it would as on a motorway at 70mph with a d turbo box your doing nearly 3,000rpm, hdi box 2,500rpm surely that 500rpm less over an hour drive would save you fuel??

I think he ment doing 30mph in 5th

But you strugle to do 30mph on a hdi box in 5th will have to be in 4th at more revs useing more fuel or am I wrong?

[Arron]

Doubt on 30 roads your going to be going at 30 for long enough to see that benefit. Any sort of hill in 5th at 30 and your dropping it into 4th surely. Will be way off boost too

[Anton]

Use 3rd at 30 with a Hdi box

[Piggy]

Does anyone know what clutch to use when doing this mod. Xud or Hdi clutch?

XUD clutches hold so much more power...standard

HDi clutches soon slip with increase boost

---

Dose it not?? thought it would as on a motorway at 70mph with a d turbo box your doing nearly 3,000rpm, hdi box 2,500rpm surely that 500rpm less over an hour drive would save you fuel??

I think he ment doing 30mph in 5th

But you strugle to do 30mph on a hdi box in 5th will have to be in 4th at more revs useing more fuel or am I wrong?

everyone assumes the higher the gear and lower the speed the better the MPG...this simply isnt true!

[Marcus1991]

[quote='Marcus1991' pid='240204' dateline='1364198859']
Does anyone know what clutch to use when doing this mod. Xud or Hdi clutch?

XUD clutches hold so much more power...standard

HDi clutches soon slip with increase boost

---

Cheers fella, would the xud clutch release bearing fit on the the HDi fork though?

[andywhy]

everyone assumes the higher the gear and lower the speed the better the MPG...this simply isnt true!

Actually, it's partly true but it depends in what situations you do it. If you're cruising on a flat road at 30 in 5th then great, but if you're trying to speed up or going up a hill it's a waste and you will use more fuel. Only go into the highest gear you can for the type of driving you're doing for the road you're on and the speed.

I know this to be true because my current car has a MPG display which is spot on (calculated manually many times) and it shows this to be true.

[Arron]

[quote='Marcus1991' pid='240204' dateline='1364198859']
Does anyone know what clutch to use when doing this mod. Xud or Hdi clutch?

XUD clutches hold so much more power...standard

HDi clutches soon slip with increase boost

---

Cheers fella, would the xud clutch release bearing fit on the the HDi fork though?

You have to transfer the XUD fork into the HDI box bud

[Marcus1991]

[quote='Marcus1991' pid='240204' dateline='1364198859']
Does anyone know what clutch to use when doing this mod. Xud or Hdi clutch?

XUD clutches hold so much more power...standard

HDi clutches soon slip with increase boost

---

Cheers fella, would the xud clutch release bearing fit on the the HDi fork though?

You have to transfer the XUD fork into the HDI box bud

Of course haha, I just had a blonde moment!

[Piggy]

SEARCH it dude...theres guides in how to convert them..on here and pug.net

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everyone assumes the higher the gear and lower the speed the better the MPG...this simply isnt true!

Actually, it's partly true but it depends in what situations you do it. If you're cruising on a flat road at 30 in 5th then great, but if you're trying to speed up or going up a hill it's a waste and you will use more fuel. Only go into the highest gear you can for the type of driving you're doing for the road you're on and the speed.

I know this to be true because my current car has a MPG display which is spot on (calculated manually many times) and it shows this to be true.

and because its very rare to 'cruise' at 30mph on a flat, you end up changing gear frequently, which makes the 5th gear 30mph idea pointless. it also means you cant get outa trouble quick!

[r3k1355]

So it's XUD engine, XUD clutch and flywheel, Hdi box and XUD clutch fork, is there a fork pivot that needs to be swapped also?

XUD clutch cable as well?

[Piggy]

http://www.theywhoshallnotbenamed/index....ditoxudbox

[Arron]

ooft.. Linking to the other side... requires 99% warning!!

[Piggy]

well wheres the guide on this site?!? I couldnt find it!

[Arron]

Your suppose to make one

[Piggy]

too late...
I done my box...
assumed there was one on here

[Marcus1991]

too late...
I done my box...
assumed there was one on here

I'll do one on Friday