Will My Sard 700Cc Injectors Support 400Awkw?

[iruvyouskyrine]

There is only one way to go.

Bosch EV14's (Injector Dynamics, X-Spurt) and then pick your flavour. 1000cc,1400cc or 2000cc. None have a downside in the application that you are going to use them. They work fine with PULP/Ethanol fuels. They still work fine a low RPM/Idle. The 1400/2000 will have more headroom than you will (probably) ever need.

Also the new 1400's are stainless and scottynm35 says that's better for running ethanol fuels.

Just pick one and go with it

[GTRNUR]

There is one other downside to the bigger injectors.

Transitions from one load cell to the next when the delivered fuel amount is interpolated produce a more inaccurate fuel delivery. I see this in the low end of the RPM scale with my setup especially.

My engine idles at 2.07ms with a 14.7 afr. At cruise in 6th gear/60km/h the injector pulse is only around 2.34ms, again at 14.7 afr. When the ecu load point moves from a single cell across 4 and the MS value is interpolated, I inevitably end up with a value into the low 14's when running open loop.

Closed loop mode resolves this a little but its far from perfect, and granted my old Power FC djetro is the other issue due to its low load point cell resolution.

[sucram]

That is more of a djetro/MAP sensor thing with ITB's as you are going from vac to zero vac just by opening the throttle a touch more.

You can rescale and use tps voltage enrichment to help but you will always have to compromise a bit. The normal power fc doesn't have this issue.

End of the day if your accelerating you want that extra fuel, the timing is more important and is more compromised. I.e if your accelerating though a low rpm, zero vac though the gears with no knock, but come to a typical suburban 90 deg corner, 2nd gear that is up hill it will knock. This rpm zone is also usually 2k at 60klm in top gear and wont knock.

If I were you I would be aiming for high 13's on that enrichment, but you don't have a 2.6 anymore so that extra bit of power will mean fk all to you so you will just be wasting fuel...

If you want to get really anal, you can also drop your base fuel pressure a bit to gain more control at the lower duty cycles, obviously if you have the head room for it. If your at 90% it wont make fk all different to top end running it at 95% max if your aim is to gain more control down low. Its not like any of you are stupid enough to run a wide band close loop while on boost, and even if you did your trim wont come into effect quick enough for a boost spike/overboost anyways. NB if you have 2000cc and only using 45% max inj duty you wont be able to lower base pressure much, you will dribble fuel.

Edited November 21, 2014 by sucram

[GTRNUR]

I didnt mean interpolation while under acceleration, I mean when maintaining a steady speed and the load cell is interpolated from multiple cells.

Im running 45psi base pressure on the ID1000's. Duty cycle at idle < 2 percent on the MFD.

[sucram]

split the difference or make it interpolate later