an injector wouldnt present a code on any scan tool

I had the injector problem too, threw no codes and at 85 hours

I will swap computers on monday, if thats not it i will check everything else mentioned above and post findings later.


thanks alot guys

well... first... 10 more mph is going to require about an additional 200 - 225 hp PER engine at that speed....

second... whoever suggested swapping the ecus is spot on...that gives you a quick answer right off... and the same goes for the rest of the sensor array

it sounds to me like a warrantee issue for arizona speed. also... if i read your post correctly you said you were looking for 500 hp... didn't those motors make 425 to start ? soo all this work for 75 hp / side ? sounds like a not great deal to me...

how much faster do you thnk that boat will be with an additonal 100 HP per side?

I agree that a failed injector(s) will not set a trouble code, but did you check for trouble codes? I also agree that swapping the ECM's would be a good place to start.

While you are troubleshooting, I would disconnect the MSD boxs, recheck the timing and run without them until you find the problem. It's all about eliminating possible causes.

Dave

we had this discussion the other day and someone found a pretty good calculator on a site somewhere. i use the math.

HP = drag x V cubed ( in ft per sec)

you say you had 72 mph w/ stock 502's so about 850 hp

so back into your drag number... 850/ 1177583 = .00072

so

hp = .00072 x 1715932 ( 82 mph cubed in fps) = 1235 hp or another 385 hp total...

am sure the online calculator will give you a similar number

1050 hp should give you about 5 mph give or take

during some troubleshooting, a map sensor code came up on the ddt, i will be replacing the sensor, can this be the total problem?

the injectors are all working correctly 46psi

just exchange maps sensors between motors. also... don't understand your comment about "injectors working 46 psi " pressure and actual electrical injector function unrelated.