Well got the HPTuners 2.0, tried some new features. I noted a a few things that I have been pushing off.

Right now I have when going WOT, injector Duty cycle at 80% at 2800rpm and quickly climbs after that to 97% with shifting at 4500 rpm, but at the track I shift at 5000rpms.


Question would I "gain" anymore with bigger injector????, which I happen to have a set of 43 pounders waiting in a box.

Also I have a HPT Spark table that I would like somebody with experince take a look at it for me. It my race tune, just need some input and different ideas maybe. Or if I can figure how to attach more than 19.7KB, smallest I can get is 1.0mb still be readable, I will post it.


Thanks
CT

 

You Would Need Bigger Injectors If You Were Running Fi Or Nitrous.....bigger Injectors Allow More Fuel In......do You Have Any Pinging?

 

I thought a guy was only suppose to run 80%max duty cycle on injectors
no FI or N02, but cam and exhaust mods. which runs up to 97% duty cycle on the injectors, just wondering if I swap in bigger ones will I see a gain?? since mine are close to 100%

 

You probably won't see any gains unless you were running lean and had some knock because of it. If you shift at 5000 rpms, you will probably have gone past the limit of the injector. If you have larger ones, go ahead and install them, but dont expect to make more power (unless you had spark retard due to the lean condition).

The 80% duty cycle is more of a safety measure. When you go up to and beyond 100% dyty cycle, the injector is basically held open the complete time instead of doing its normal open/close pulses. That constant open time period generates heat and can cause the injector to malfunction. By staying under 80% duty cycle, the injector isn't under as much strain and can handle the load. That doesn't mean it won't work at 90% or 100%, just that it isn't designed to do so. After 100% duty cycle, the PCM is telling the injector to open for a longer time period than is available between each cylinders ignition event. As rpms increase, the time frame between each combustion cycle gets smaller and smaller, allowing far less time to fill the cylinders with air and fuel.

 

Yep, Yep... Just don't go with a 60lb injector unless you want a painful tuning lesson... LOL Go with like 55's. Reason being that the 60s have to be tuned like 72...and idle is a bitch.

 

Have a set of 43's here, but wait for now.

Big thanks for the helps

Going for all this combo has in it, how's 32* of timing on the high end strike you. and with iron heads!!!!



Don't worry got a secert fuel mixing brewing. little of this, little of that.