Just looking for back-up information to confirm or deny what I have heard from other parties please. I run a TD5 90 with Grabber AT tyres (a lot quieter than the old G90s) and after a couple of years of pownership, I think it's time to start tweaking it a bit. I have been told that PSI do a damn good power booster performance plug in, but have only heard a couple of views, so would appreciate some more info from anyone who is currently running one please.
The second thing is raising the gearing by fitting a Disco transfer box (or ratios at least) which I have heard and read more about, but need to get a feel for the problems etc. asociated with that, so again, has anyone done it and did you have any problems, or can you provide feedback one way or the other please?
Thank you

I tried a psi box years ago on my td5 disco and wasnt that impressed, then tried another that was a lot better cant remember the name but had two boxes.
The psi one is just an injector timer cheater ie keeps them open longer to give more fuel but the other one is a lot smarter.
Them binned that and got it chipped by TD5Alive very good Gary is the mans name very clever and if you are not happy he will sort out a tune to suit you.
This is the one its not made by terraifirma just their badge, http://cgi.ebay.co.uk/Terrafirma-Po...CarParts_SM&hash=item2eb5da102d#ht_500wt_1156

Lynall

I have heard good things about TD5 Alive too. Thank you for answering so quickly.

fitting either disco 1.222 ratio gears or 300 tdi transfer box is better unless on stupid big wheels

I have one of Gary's maps and its one of the best things I did in terms of power and torque. Believe it or not my mpg also got better even when towing. Not cheap but you get what you pay for and Gary is always happy to pick up the phone for advice. He spent most of the day with me modifying the mapping and test driving until it was what I wanted. He knows his stuff and stands by his work.