EdyJun

<center><img src="http://www.modifieda4.com/images/fpr-install/DSC00351.sized.jpg"></center><p>Here is the flow rate for 4 bar vs 5 bar for stock injectors:

349cc/min - S4 w/4bar (stock) 0% larger than stock
390cc/min - S4 w/5bar 12% larger than stock

My setup is going to be GIAC X (K03 code) w/ crushed 4 Bar FPR.

My question is does a 5 Bar (Crushed 4 Bar) flow more than a 4 Bar in every situation i.e. idle, part throttle, or WOT?

If so can the ECU adjust for this extra flow @ Idle and Part throttle? (I know the ECU can adj +/-~25%, is that enough?) I am assuming that @ WOT the ECU will not adjust, however it can be adjusted via Lem.

OR

Does the 5 Bar *allow* to flow more up at top but flows the same at bottom and middle?

Thanks,

Edy

jprice@CPS

The ECU opens the injectors for x milliseconds. Regardless of how long the injector is open, you have extra pressure pushing the fuel out. Because of this, you have extra fuel all the time. lemmi out the difference in primary and enjoy.

B5QShip

meaning fuel is added or pulled in proportion to load (*dependent* on throttle pos). Changing FP is a multiplicative adjustment in hardware since injector on time x fp is proportional to total flow. Therefore, the primary fuel adaptation channel in lemmi should be able to adjust/account for the FPR change in all load/rpm scenarios.

You'll obviously need to lemmi out ~10% primary, so presumably your idle &amp; pt trims should stay within a reasonable 5-10% window.

EdyJun

Any idea or suggestions on how much to start with (pull) lem for primary fuel? thnx

B5QShip

My plan is to start with 10%

jprice@CPS

If you had things right on with the 4 bar fpr, and you expect 12% more fuel, start with 10% less on primary vs where you had it set while running the 4 bar fpr

EdyJun

I was thinking of 12% since there is 12% more fuel. I will let u know.

EdyJun

I think i will drive it abit w/ out any lem. and c what block 32 looks like and go from there.

jprice@CPS

nah start with 10% less than what you had primary at before. and log block 031 @ wot.

SchagenWagen

<center><img src="http://pictureposter.audiworld.com/44371/5bar.jpg"></center><p>from crushed FPR supplier. Being on **** side, I just bought an original 5bar later on. From size of fuel passages I would assume it flows better, but I did not have any issues for 8 months of use of crushed 4bar