30lb inj. h.p. rating...?
- Thread starter 03s281sc
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hotmustang331
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From what I HEARD, 36#s last until 400RWHP....and 42s are good to around 500.
Although I know of a local guy running 570RWHP on 36# injectors with a 96 or 97 cobra. I have no idea how, but he has 15 PSI on the motor.
Someone like Jstreet or randy will hopefully chime in, as they know more about that than me.
Although I know of a local guy running 570RWHP on 36# injectors with a 96 or 97 cobra. I have no idea how, but he has 15 PSI on the motor.
Someone like Jstreet or randy will hopefully chime in, as they know more about that than me.
jstreet0204
Active Member
jstreet0204
Active Member
Built98GT said:
19's are good to around 300hp Naturally Aspirated, not supercharged. 30's would be good to around 400hp if t were not a blown engine.
Do the math:
30 lb (injectors) X 8 (cylinders) X .85 (duty cycle)/.6 (Brake Specific Fuel Consumption; supercharged engine)= 340 HP
You can easily support 340 FLYWHEEL HP. In theory, you can support up to 400 FWHP, if you remove the .85 duty cycle, but you'll be maxing out the injectors with no safety margin.
30 lb (injectors) X 8 (cylinders) X .85 (duty cycle)/.6 (Brake Specific Fuel Consumption; supercharged engine)= 340 HP
You can easily support 340 FLYWHEEL HP. In theory, you can support up to 400 FWHP, if you remove the .85 duty cycle, but you'll be maxing out the injectors with no safety margin.
jstreet0204
Active Member
Mel96GT said:
That formula is a general rule of thumb, but keep in mind that it does not consider changes in fuel pressure. As the fuel pressure increases the injectors will flow more during the same duty cycle.
03s281sc said:i wonder why saleen only put the 30's in their cars when they are advertised at 375hp....i guess im gonna have to fork out $300 more for the 42's...this modding crap aint cheep...but addicting
because they are advertising crank hp and not rwhp.
