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View Full Version : HP rating for Gen 3 fuel pump?!?!?


cgstealth
03-23-2015, 09:03 PM
I'm just wrapping up the mods on my Gen 3. I'll be right around 600-625HP at the wheels. I'm not sure if I need to upgrade pumps or will my Stock Gen 3 feed my monster just fine?
JonB ~ PartsRack
03-23-2015, 09:08 PM
Pumps not rated by HP..... did you change injectors?
cgstealth
03-23-2015, 09:10 PM
I did the Gen 3 Arrow racing engine kit. So I have Gen 4 injectors.
345s-bspinnin
03-23-2015, 10:29 PM
Stock pump and injectors on my heads/cam Gen III 643whp, SAE (667 whp uncorrected). Running at 12.7:1 AFR, and includes WOT from 1st-5th gear at the Texas Mile.

You will fine with 620whp on an all-motor setup. Its all whole different question if power adders are involved.
cgstealth
03-23-2015, 10:39 PM
Awesome thanks!!!
G37Sam
03-24-2015, 01:17 AM
You have to keep in mind these engines run very rich from the factory. That gives you a bit of leeway with breather mods since you'll be running a lot leaner when tuned.


Stock pump and injectors on my heads/cam Gen III 643whp, SAE (667 whp uncorrected). Running at 12.7:1 AFR, and includes WOT from 1st-5th gear at the Texas Mile.

You will fine with 620whp on an all-motor setup. Its all whole different question if power adders are involved.

What duty cycle were your injectors running at when tuned @ 12.7:1? Did you log your AFR during the texas mile?
345s-bspinnin
03-24-2015, 11:04 AM
You have to keep in mind these engines run very rich from the factory. That gives you a bit of leeway with breather mods since you'll be running a lot leaner when tuned.

What duty cycle were your injectors running at when tuned @ 12.7:1? Did you log your AFR during the texas mile?

I didn't log data during the Texas Mile, but did have one my GoPro's catch my Innnovate pod during several of my 190mph+ runs. It was pretty flat at 12.7-8 through most of the run/rpm, and progressively getting richer (12.5:1) as I approached redline.
G37Sam
03-24-2015, 02:34 PM
I didn't log data during the Texas Mile, but did have one my GoPro's catch my Innnovate pod during several of my 190mph+ runs. It was pretty flat at 12.7-8 through most of the run/rpm, and progressively getting richer (12.5:1) as I approached redline.

That's perfect. I'd be just a little worried of running the injectors above 90% duty cycle that's all.
345s-bspinnin
03-24-2015, 10:55 PM
That's perfect. I'd be just a little worried of running the injectors above 90% duty cycle that's all.

My heads/cam car is going on 3 yrs with that setup and without a single issue. My use includes everything from coffee/cars, HPD events, 1/4- 1/2- and standing mile and many exciting trips to the local grocery store. You will be fine.