Injector Issue possibly

[boostisgood]

Ok all,

I just got off the phone with Shawn from Madzdaformance. The MSP has 285 CC injectors with a single in tank fuel pump, and fuel pressure regulator, set to 43 LBS. EDIT: (thanks for the call Shawn on the FPR)

I have an HKS CAMP system ( ttp://www.hksusa.com/categories/?id=1082 go here to learn more), and I have it set up to monitor the Injector duty cycle. I had it set up for 360 cc injectors, cause I heard, read, imagined that is what the MSP had. Well to make a long story short. right at 6300, on, RPMS, 360 cc injectors would be hitting 80+% duty cycle. Thats not good, and probably worse on the 285 cc. Im wondering if this could be attributed to the pig rich issue/stumbling issue.

Ill adjust the settings, and monitor it, d/l a graph to my laptop, and post it here.

FYI, if an injector goes about 80-90% duty cycle, you could hydrolock them open. not good.

 

[Logan]

Interesting!
Keep up the good work.

 

[iON Performance]

boostisgood - it's not hydrolocked open it's called going full static

Injectors rarely fail nowadays, especially on Japanese cars. Basically the IDC between 80%-100% isn't too much different.
We consider when a injector goes 80% IDC that's static to us.

When we tune cars, we like to be a little south of the 80% mark to give an extra margin of safety.

 

[boostisgood]

Thanks for the correction ION. I always worry when an injector goes over 80%, no matter what car. It is good to have an injector working, but 80% jsut worries me, especially when I had a larger injector set in the monitoring.

We will see what happens when I adjust it. Ill keep you all posted.

 

[Kooldino]

You sure it's a 285? Everyone else reported 280cc, AFAIK.

Either way, 80% DC on your car stock should be ok...but I don't know how the CAMP unit reads duty cycle, etc...does it read it by what the ECU says? If so, i'd guess it would be voltage? In that case, I don't think the CAMP unit would know or care about injector size, just how long they were open. But if that were the case, why would it ask about them...

 

[Kooldino]

Even 85% DC for short periods of time is doable on a lot of cars...

 

[boostisgood]

The camp system lets you hook into an injector wire at the ECU, I hooked into the #1 injector, as its the farthest down the fuel line, thus more prone to get the less fuel then the others.

The CAMP system then asks you what the injector size is, and it does its own calcuations, how it does exactly, I dont know. probably by the variances in the voltage coming from the injector versus what the injector size input was. Ill call HKS again and find out

All in the name of the MSP, I tell ya, my real work will never get done

 

[twiztedjeckel]

did i mention i want the HKS camp system??????