Jg1000

iTrader: (1)

Ok so I have just purchased '89 SR1 292 with 454 mags. Engines are fresh with comp cams. compression tested almost dead even 170psi on every cylinder, a couple were 165 and a couple were 175. Anyways I checked base timing is set at 8degrees at 800rpm. and I'm getting wot on the carbs. I first tried 24pitch 4 blade bravo 1's and 60-62mph at 4500 rpms. Today I tried 22pitch 4 blade bravo 1's and 60mph at 4900rpms. What gives? Brochure says 66mph with stock 23p 3 blade mirages. Also this is at LOTO. Also new cap, rotor, plugs, wires, and fluids.

Jg1000

iTrader: (1)

Just wondering if the 4 blade prop isn't fighting me with too much lift. I have the trim all the way up and it feels that it could benefit from more. Just thinking that maybe formula had it right with the 23p 3blade mirage. unfortunately I bought the boat with one 25p mirage and one 25p quicksliver. ..... please help !!

Ted G

iTrader: (1)

The four blades will typically be slower on the older Formula hull. State of the art technology back then was a clever prop You may actually see a higher top speed with the three blades on it, but cruise and mileage will suffer. Also in 89 they didn't have GPS speedos so that number is probably from a dreamometer which tended to run 3-5 moh faster than true radar or GPS.

Dtile

jg1000 - have similar setup and hoping getting my bravo's 1 labbed with BBlades witch bring the max out of the boat. I plan to advance timing while using 93 pump gas too, though dont have the Mags. mike

Jg1000

iTrader: (1)

All of this data is with gps.... what is everyone else getting with their 292 non stepped hulls?

86242ls

iTrader: (4)

did you purchase that boat from glencove marina?

heavyc

I've got a 1990 292 Sr1 mags stock 23 mirage she does 65 seen 67 a few times

randymbtech

A good friend of mine has a 1990 292 with fresh 454 mags, his does 60 most of the time, I think he has seen 62 a couple of times. It has Mirage 3 blades.

Jg1000

iTrader: (1)

I didnt buy this from glencove. now for the last two comments how does the same boat differ 5mph ?!? thats a big power difference. maybe the difference between salt water and fresh water? does anyone ever trim the 3 blade props to get more rpms?

bunky1957

My '89 311 with mags will do 67 mph (GPS) with Bravo 1 26 pitch props, and 68 with 25 pitch Mirages (not Plus). Motors are stock except for Gil Offshore exhaust. If your not making the speed you are not making the horsepower.