Re: Need some help with 502 Problem
 

an injector wouldnt present a code on any scan tool

Re: Need some help with 502 Problem
 

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

Re: Need some help with 502 Problem
 

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


thanks alot guys

Re: Need some help with 502 Problem
 

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...

Re: Need some help with 502 Problem
 

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

Re: Need some help with 502 Problem
 

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

Re: Need some help with 502 Problem
 

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

Re: Need some help with 502 Problem
 

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

Re: Need some help with 502 Problem
 

the injectors are all working correctly 46psi

Re: Need some help with 502 Problem
 

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