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I bought Precision Converter. It's billet too and it's waaaay cheaper. Of course works as it should be :)

Buy a second PCM - tune the new one and keep the old one stock. Problem solved.

From S550 the ratio is taken from BCM not like in S197 from ECU. You can still switch it back on in S550's ECU should you need to. Stock tune will work with ratio up to 3,73. 4,09 requires a change in BCM.

No tune needed - only a small change in BCM. It can be done with Forscan - free of charge. On the other hand Forscan will not work properly with a locked tune like Lund.

No probs - it occurred at higher speeds using 5th or 6th as mentioned above - it threw a code and advance trac light went on. It's no biggie - just put a correct ratios int that table and you would be on the road in no time.

I've just programmed the wrong ratios in tune and... MIL, Cruise not working, ESP not working. So it is important to say the least.

You can't lock a Ford tune with HP Tuners - it's not working. You can set the "slave" interface and tune remotly this way but that won't protect your files from reading it again.

Nice try - nope. Do your math - I was talking about 4th as you first suggested.

And what is the stock gear ratio for AU? I believe it's 3.55 like all exports so (not being sure about his MT drag radial size but lets assume OD 28 inch) so 248 kph @ 7500 rpm so 155 mph not 142. Improve your math you must my young padawan...

His car is "stalk sealed" bone stock AFIK. But judging by the way he post he must be around 2000 rwhp Top fuel dragster pro racing since he was 5...

Wrong answer - I know the basics form school. It was an answer to your "LOL" about that Aussie Dyno sheet. 230 kph for me would be 5th already - I assume you know what gearing they are running? Because I don't.

You must chill out soldier - I'm not here very often but I see you all over the place arguing with everyone :shrug: No offence.

Lund must be working with Whipple closely - I asked Lund about that Edelbrock kit months ago and they said - no, it's not a good kit go with Whipple. Just saying...

I don't like the way you speak but I must agree - that guy is very well known here...for knowing everything, well at least that's what he claims :lol:

LOL It's a different approach - they using speed vs power not rpm vs power - they do the same in EU. Narrow minded?

Eeee no, it is changeable in the tune but is that important? I dunno.

There are few different pressure sensors - it's configurable in tune. Your actual pressure is fine but it's sends the incorrect signal to PCM. Lund has been struggling with this once in a while - they should stop mixing their canned tunes long time ago...

Buy an engine with ford's control pack - pcm is not a problem. How you fit the engine mechanically? That would be a bigger challenge but it's possible for sure as it was done before. Lot of Fox bodies coyote swaps all over the place.

Oh sorry, thought yours an auto :)