# Went to the Dyno

**URL:** <https://forums.speedlife.net/t/went-to-the-dyno/128600>\
**Category:** SON240sx Automotive\
**Created:** [October 6, 2009, 8:33pm UTC](https://forums.speedlife.net/t/went-to-the-dyno/128600 "2009-10-06T20:33:55Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![Silvia\_Drift](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/silvia_drift/32/5271_2.png) [@Silvia\_Drift](https://forums.speedlife.net/u/Silvia_Drift)\
**Post date:** [October 12, 2009, 11:23am UTC](https://forums.speedlife.net/t/went-to-the-dyno/128600/13 "2009-10-12T11:23:43Z")

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> [@SNES Games](https://forums.speedlife.net/t/snes-games/24266/25):
>
> Fuel pressure may be low or your pump may not be flowing enough. What fuel pump are you running? Also, you may need to calibrate the PowerFC. It may be thinking you’re running some smaller injectors if you haven’t set up the parameters yet. Check also the injector impedance value. I’m not sure that the PowerFC is automatic for injector impedance and if it’s running high-impedance injectors at a low impedance, that would certainly account for your lack of fuel.
> 
> 1. Double-check injector size. Check injector impedance using a multimeter.
> 2. Check injector parameters in PFC (impedance, flow, and pressure values).
> 3. Check fuel pressure on FPR and in PFC. Correct me if I’m wrong but I think factory specs should be around 38-42psi?
> 
> FTR, don’t ever tune for 90% duty cycle. It’s not the issue here as 550s should be more than enough for what you’re putting down, but on a high revving motor (anything above 6k) that is REALLY pushing your injectors. Ideally you want to tune for 70-80% duty cycle.
> 
> Rule of thumb is 1lb/min/hp…

The fuel pump I’m using is the stock one from a Z32 TT. I’ll get an adjustable FPR and see what happens.

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