FPR after fitting extractors

efteoh · Post by **efteoh** » Mon Oct 31, 2005 11:38 am

does anyone know how much of and increase in power a FPR will add after the fitting of the extractors? is it really worth it? i didnt want to hijack the RPW extrator threads

spetz · Post by **spetz** » Mon Oct 31, 2005 12:54 pm

I think the FPR is mostly to prevent the engine from running lean rather than pure power increase. Though I am sure feeding it the right amount of fuel would increase power.

barfy · Post by **barfy** » Mon Oct 31, 2005 2:54 pm

I had this fitted to my car but also had the manifold/TB fitted also... My car definately has gain especially high end. Im sure dave from RPW would be able to fill you in on the gains.

efteoh · Post by **efteoh** » Mon Oct 31, 2005 4:46 pm

i thought the leaner the better (close to 14:1 anyway) and since it would lean out in certainn areas, as long as you have a SAFC to correct it.

secondly, arent the injectors getting the last say about the amount of fuel? ie, not running over 80% duty cycle

thanks for the feed back, im jsut trying to see what i should do before i get the safc tuned up

spetz · Post by **spetz** » Mon Oct 31, 2005 11:15 pm

I think with the SAFC tuned you shouldn't need a FPR.

And yeah leaner is better to some extent. Obviously running too lean can lead to detonation and stuff.

Post by **Bennoz** » Mon Oct 31, 2005 11:24 pm

You dont want your car running lean or rich - you want it just right.
The FPR's are designed to keep the fuel pressure within the fuel rails up to a certain pressure - so when you nail it, you dont drain the fuel rails completely and end up running lean under full throttle. On the flip side if you adjust your fuel pressure manually to compensate for this - you end up running rich on idle or low rpm. The FPR eliminates both: Gives you minimal pressure when less pressure is required, yet ensures the rails are fully loaded in case you punch it - then it loads up & gives the pressure required to run at full throttle.

barfy · Post by **barfy** » Tue Nov 01, 2005 9:47 am

Bennoz wrote:You dont want your car running lean or rich - you want it just right.
The FPR's are designed to keep the fuel pressure within the fuel rails up to a certain pressure - so when you nail it, you dont drain the fuel rails completely and end up running lean under full throttle. On the flip side if you adjust your fuel pressure manually to compensate for this - you end up running rich on idle or low rpm. The FPR eliminates both: Gives you minimal pressure when less pressure is required, yet ensures the rails are fully loaded in case you punch it - then it loads up & gives the pressure required to run at full throttle.

Yeah what he said