Originally Posted by
massivewangers
Sorry, what?
If it's so strong, why are so many ZT guys moving to MTX boxes now? Nothing to do with them mashing normal boxes then?
How many boxes did Christian Major's car go through over the years? 17? That included some fancy CTS ones.
The IB5 has a nicer shift, but it's a pansy little thing for turbo use.
Plenty of them running IRO of 300bhp with no issues. Anything beyond that I don't know (although a certain someone long since banned from this site and certainly the most knowledgeable Zetec Turbo person I know of used an IB5 on his 450bhp ZT Escort and insisted that it was stronger than an IB5, but he had uprated two parts of it, but would never disclose what) , but I'd look at other options as the MTX is a joke to use. I'd hate to drive a properly powerful car with an MTX box.
In a modestly-powered car the IB5 can take plenty of abuse.