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PostPosted: Tue Feb 05, 2013 12:07 am 
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I am putting a 2.0 silvertop into a mk3 Fiesta Si, I want to use an ib5 box but don't know which one to go for.

My first thought was an Escort RS Turbo series 1 or 2 to get an LSD, but apparently the ratios may be too tall.

There seem to be quite a choice of boxes as follows:

1. The standard 1.6 already fitted to the Fiesta

2. 1.8 Fiesta Diesel

3. Ka

5. Puma racing (probably too expensive)

No doubt a number of others I'm not aware of.

I want some close ratios for good acceleration plus a tall 5th gear for more relaxed motorway driving.

I know that ideally the LS diff should be fitted to whichever box is used, and I could get one of these from an RS Turbo box, I don't know if the S1 or S2 would be the more suitable LSD donor?

In any event I don't feel particularly confident in trying to fit the diff as I have never stripped a gearbox before!

All advice greatly appreciated!


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PostPosted: Tue Feb 05, 2013 9:25 am 
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Joined: Sat Apr 08, 2006 7:54 pm
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Location: Didcot, Oxfordshire
Drives: Millennium Puma
the standard box, diesel box and RST boxes are BC boxes not IB5

S2 ERST Box with LSD would do you good!

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PostPosted: Tue Feb 05, 2013 4:13 pm 
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if you can get a Erst box id go for that !

i found the ratio's spot on when i had one in my 2.0'd mk2 fez :thumbsup:


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PostPosted: Tue Feb 05, 2013 5:43 pm 
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Joined: Fri May 23, 2008 12:40 am
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Location: Portsmouth
Drives: Fiesta Si 2.0
Standard gearbox will be fairly quick on acceleration, sits at about 3-3.5k at 70mph, cant remember exactly, and it'll top out at about 130mph sat nav speed.

For a more relaxed approach to motorway driving, a diesel box would probably be better as they are meant to have a really long 5th so it'll keep the revs down.

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PostPosted: Tue Feb 05, 2013 6:56 pm 
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Joined: Wed Sep 10, 2008 1:21 pm
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Location: Aberdeen, Scotland
I agree with Danny, the 1.6 box is pretty fast up to about 110 but is really noisy cruising. If you sit at 80 it's closer to 4k :(
Not sure how good diesel box is at acceleration but people have said it tops out off the clock so good for top speed and comfortable cruising.
I want to do a hybrid with the 1.6 box and diesel 5th gear. Just need to find a gear puller for uner a hundred quid first to save having to get the blow torch out and heating gears.

Paul


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PostPosted: Wed Feb 06, 2013 10:58 am 
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Joined: Sat Apr 08, 2006 7:54 pm
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Location: Didcot, Oxfordshire
Drives: Millennium Puma
yep - 80 is 4000rpm as confirmed by Si Turbo :lol:

diesel box isn't bad on acceleration -happypaul will confirm this! but it is much better for cruising :)

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FACT wrote:
Ford is not a decision you make to like, its a passion you grow up with.


RIP BEN ELVIN (JAM) 6.6.84 - 3.10.12 - Gone but not forgotten - The below sums you up chap
Ben Elvin "Jam" wrote:
Through serious illness you meet some inspiring and determined people. its the best we can do as human beings to inspire and drive the determination of others. Ben.


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PostPosted: Thu Mar 07, 2013 12:43 pm 
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Joined: Tue Jul 05, 2005 1:56 pm
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Location: chelmsford Essex
Drives: Ford Mustang GT 4.6 V8
2.5k at 70 with a erst lsd box, I got 44mpg on a long run once as well, perfect box imo :)

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