Promax vs 260 vs prostock

[90 5.0]

I've seen various dyno charts for stock promax. They usually fall between 240-249 hp on the limiter.

Does anyone have a dyno chart for a pm with raised limiter compairing 260@ 8k vs a pm @ 8k etc

what about a stock 260 dyno and one with 26cc heads.

Pm with drag electronics with 26cc heads

prostock legal powerhead with 32 or 26cc??

thanks!!!

[texasvector]

Subscribed.

[tux974]

^^x2^^

[16ft superboat]

^^x3^^

[Dave Strong]

X4

Dave

[Go Time]

This sheet is from a stock Promax with SVS and Brucato ECU with dyno tune.

[tux974]

This sheet is from a stock Promax with SVS and Brucato ECU with dyno tune.

Now get Lee to play with a 260 and post up needed details.....
Stock 38CC heads correct?

[Go Time]

Yep, stock heads and 23 degrees WOT

[texasvector]

I see the torque falling off...but when does the HP fall off higher than 7500?

I would guess the prostock motor's torque would peak lower. But when u turning a 22" who cares.

I'd love to get my hands on a prostock tune for a brucato....gonna have to sneak one off some bodies boat at the race this year. Ninja skills!

[Go Time]

I have my limiter set at 7600 rpm

[Dave Strong]

I have a Merc Racing brochure somewhere that had HP and torque graphs. All the 2.5's showed peak torque arounf 5-5300rpm, 280, Pro Max, and Drag.

Dave

[whipper]

So what is the difference in a promax prostock compared to stock? Fuel delivery? Numbers look great!! Mine revs with Tonys box to 7500+ with 33cc heads. But at around 7300 seems to be the sweet spot as confirmed buy the chart it would seem.

[texasvector]

I know the prostock 200 motors are running high psi curves with custom tunes....some run 56lbs some turn down to 50 lbs

I would think pmax would benefit the same doing this

I know my laser front 260 woke up when I went to a 56lb curve

[90 5.0]

I know the prostock 200 motors are running high psi curves with custom tunes....some run 56lbs some turn down to 50 lbs I would think pmax would benefit the same doing this I know my laser front 260 woke up when I went to a 56lb curve

ive seen a "prostocked" pm run once, it was pretty mean for a unported pm. defintitley made a big change. interesting that you put a laser injection on a 260, most i see are horns on pm's LOL. But for 660, i'm wondering if a promax with drag electronics would be faster than a 260. No doubt in 1320 the 260 would get it, btu in 660 i'm not sure...

[texasvector]

Well..it was a 245...took carbs off and put efi