SpidRacer

Need to adjust the Trim Limit and Position Sender switches on my Bravo 1 behind the bone-stock Gen VI 502 Mag MPI in my 2000 271 FASTech. Found the Merc instructions here: https://www.mercstuff.com/trim_limit.htm

Any feedback or recommendations from "real world" experience regarding the Merc-suggested dimension? (FYI: I have not done the spacer swap to improve 0-to-plane time...)

SFOcean

iTrader: (1)

maximum trim ram pin to pin is 21.75"

ThisIsLivin

I just trimmed mine out to 21.75" and checked where that came to on my gauge. I don't think the trim switch was ever connected.

SpidRacer

Yeah... Turns out both my Trim Limit and Trim Senders are calibrated well. Pin-to-pin I got 22" and left it there. What got me here to start is that the Trim Gauge only gets to about 80% of the labeled range when drive trimmed out fully to limit @22". So I guess that's where it lands based on the travel. If I use the Trailer Up switch, then the gauge goes to max. Left it all untouched but glad I confirmed. I was not the one that replaced the Trim Limit switch and now I know it is set properly. Plus I now know the max trim level range at the gauge.

xlint89

Can you elaborate on this please? Never heard of this trick until now. Thank you

SpidRacer

General consensus is that a stock (502) 271 FASTech is painfully slow to get on-plane. As I understand it, an "adjustment" is made where the rams bolt up to the drive allowing the drive to tuck-in more than the factory setting. By removing the ram nut at the drive and pulling them out, one can find that there is a spacer in a "position B3", which keeps the drive leveled and not too terribly tucked-in to prevent the boat from bow-steering once on-plane if drive is not trimmed-up quickly. This spacer can be repositioned to the other side so that the drive does tuck-in more when the rams are fully retracted. This helps a bit lifting the stern and gets the boat on-plane a bit faster. Of course, one apparently needs to be quick on the trigger to add a bit of trim once on-plane to avoid the bow-steer.

I mentioned I had not done it, as geometry dictates that once one does this, the Trim Limit would need to be adjusted a bit to then allow the rams a bit more extendion so that the drive can achive the recommended max 21.75", plus the spacer offset, to regain the full trim-out angle again.

xlint89

Thanks for sharing. Never read that before.

flat rate

iTrader: (3)

that spacer is the celery stick!