ALRIGHT GUYS I COME TO YOU AGIAN PLEASE HELP
I TOOK MY 26 FT BAJA WITH A STOCK 454 MAGNUM
WITH RAN 62 ALL DAY SPENT 8 OR 10 GRAND AND
NOW SHE RUNS AT 68 NOW I NOW SPEED AINT
CHEAP ON THE WATER BUT COME ON. ALRIGHT
WHAT DID I DO WRONG I PUT A 250 HOLLEY BLOWER
HOLLEY RECOMMENED CAM, GOLD ROLLER ROCKERS
EDDIE MANIFOLDS ,2 750 HOLLEY CABS,CROSSOVER,
COMPLETE MSD IGNITION I THINK IF I REMEMBER RIGHT
8 BASE 31 TOTAL TIMING.26 PITCH BRAVO ONE 4 BLADE.
SHE RUNS AT 3 PSI BOOST 4600 RPM 68 MPH. NOW I THINK
SHE MAY BE OVER PROPED . BUT TODAY I ORDERED A 19154
UPPER PULLEY HOPING TO INCREASE BLOWER PSI FROM 3 TO 5
PSI SOLVING ALL MY PROBLEMS ?? YA RIGHT PLEASE HELP
WOULD APPRECIATE ANY INPUT. THANKS GUYS.

Boost is related to rpm. The higher the rpm the more boost. Your probably not getting the full 3 lbs. Either get a smaller prop or maybe the 5 lb pulley will do the trick.

Two miles per hour gain for each one pound of boost is not too far off. Rpm is a little low but more boost will raise that and be just about right. Make sure you have enough fuel pressure and are rich enough at top end.
JB

I have a VERY similar setup. (It's almost scary) 454 .030 over B&M 250 , 950 Holley(single) , cam (close to 525SC specs), Lightning Headers , crossover , v-6 ignition module(allows more base timing), I'm only running 8:1 compression but I run 7lbs boost. This is in a Baja 265 Force. I run nearly identical speeds as you are.

The increase in boost may help some. I think you could definitely drop in prop size. That motor should turn 5200-5400 rpms(short WOT blasts) That's what I shoot for. I'd try a labbed 25 Mirage Plus or if you could get your hands on a plain Mirage 25(not a "Plus" , they have less cup). I haven't got my hands on one of these yet. I debating on labbing my Mirage Plus 25. I can turn a Mirage Plus 23 @ 5400 rpms and a Mirage Plus 25 @ 5000.


Keep tweaking , keep me posted,

Thanks

You need a 24" prop. Get the boost up to 5 lbs. Try only one carb around 850 cfm. Make sure secondaries are jetted rich.

I put a Whipple on my Outlaw and saw a gain of 11 mph but this is a more efficient blower that is also intercooled. I run an 825 carb.

Also get an ignition module that allows a total advance of 30 degrees. If you have a thunderbolt 5 ignition get a module from a mercruiser 525sc. It has total of 30 and has rev limit of 5300 rpm.

Dave

P.S. It takes alot of H.P. to get these Baja's going faster!!!!!

At 3 lbs boost you are lucky if you are making about 20 % more power. 385hp stock x 20%= 77hp, should be good for 5-7 mph gain. To go faster you'll nedd more power. More boost, intercooler. GEOO

Are you still running stock exhuast?? aftermarket will help a blower application much more than a stock motor!!

You should be turning at least 5000 rpms. I'd prop down and see if your boost comes up....Are you running a boost gauge and fuel press gauge??? If not get them!!! 5lbs should be OK for the Mag motor for the 'short bursts' of full throttle.

I would try the prop before you go to a smaller pulley.

too much carb...all else fails.....more boooooost!

one more ??,,,,10 k spent on go'n faster....do u have full hydrulic steering??