Run out of fuel on 433kw on 19psi … really thought the fuel pump I have would have been good for a bit more than that.
When I say run out, I mean there was nothing coming out of the return to the tank. The injectors are using everything the pump can supply.
The Crank Triggering System works nicely with rock steady timing, will be able to take full advantage of this when we finish the tune after the fuel pump issue is sorted.
A short video of one run. http://youtu.be/nR31tFQ25U0
A bit more info:
As you can see there is a bit work to do on smoothing the curves… Dave (tuner) is thinking a lot of it is due to the timing retarded in this area.
Power and Torque curves can be moved to the left a bit by advancing the CAM's at the expense of Top End… bit a of balancing act there.
All in all, I am pleased with the spool/response considering the size of the turbos. One thing of note is that it looks like it is wanting to make power at the top so I can be confident the DIY porting of the OEM Exhaust manifolds is up to it
Ok… have upgraded the "feed" Fuel line (Tank to the Fuel Rail/s) to 10mm (an-6) and installed dual Aeromotive 340lph fuel pumps.
Now to find some time to get the tune finished, most likely won't until the new year now though.
Have had both pumps running together at idle, the Fuel pressure reg. has no trouble keeping up with the extra flow so all is good.
Have also fitted a water injection system, I am undecided as yet as whether I ran straight water or a water/methanol mix.
Currently set to have the water start at 8 psi … my understanding is that the amount of water gradually increases until 24psi, at this point there is 41lph being injected.
Watch this space, tuning/dyno result to follow … hopefully not too far away.
Finally got the car in for it?s tune after fixing the fuelling issues from last time ? Alas, there is still an hour or 2 left to do as we decided to cut the session short due to a lot of oil being blown out the breathers ? at first we thought we had blown a oil line, got the heart racing a bit ?
Anyway onto the important bits ? just to recap what was done the car since the last tuning attempt:
* Fitted a 2nd Aeromotive 340 Fuel Pump set to come on @ either 55% injector Duty Cycle or 14.5psi which ever comes first.
* Fitted an-8 fuel line from the pumps and an-6 return.
* Fuel pumps are wired directly to the battery via relays ( guarantied NO voltage drop )
* Fitted water ( only ) injection set to come on @ 8psi min and 25psi max ? failsafe fitted and set to change to a non water injected Timing and Fuelling map if a problem is detected.
* Inlet Cam Timing has been advanced form +6 deg to +10.5deg
Without Water Injection:
*Boost level = 20psi achieved @ 4500rpm ( previous tune = 19psi @ 4750 )
*446 rwkw @ 6851rpm ( previous tune = 333 rwkw @ 6965rpm )
*698 Nm @ 4500rpm ( previous tune = 644 Nm @ 4888rpm )
With Water Injection:
*Boost = 23psi @ 4500rpm
*490 rwkw @ 6896 rpm
*772 Nm @ 4611rpm
Improvement on 1st Tune … The running out of fuel one:
*Power @ 4500rpm went from 256kw to 362kw by adding +4.5deg cam timing, 3psi boost and water injection
*Torque @ 4500rpm went from 550Nm to 765Nm ? Who said 3071r Turbos are ?laggy? on our engines.
More work is needed to:
* Refine the Water Injection delivery e.g.: will most likely replace the Snow Performance Module with a Solid State Relay so the ECU can control when and how much.
* Modify the Crankcase breather system, what I have is completely inadequate at this power level.
Dave ( Tuner ) was keen to try just another half a psi ? said it would do 500kw ? but I wimped out ? watch this space
Graph with Water Injection vs No Water.
hey you say you need to refine you water injection delivery? What issues are you having with it? Im running the aem injection unit and if you do a pull in 3rd gear for example its fine but changing gear or fethering the throttle it doesn't like the rapid boost changes and drops me back to failsafe low boost setting.
Is it a similar problem your having?
My concern with running a relay is that my unit ramps up the voltage to the pump. So with the relay are you planning on giving the pump full voltage straight away?
The water injection system I have is "Snow Performance" using a controller that doesn't provide progressive water injection rates e.g. the water injection appears to be either on or off, in my case on @ 8psi.
I am not having any of the problems you are experiencing, the only reason for considering using the Solid State Relay is to have total control over how the water injection is delivered … basically I want more power
We believe there will be a benefit by starting the water injection in @ around 2 psi which I can't do with the current controller.
The Solid State Relay provides Pulse-width modulation (PWM) to the injection pump via a GP Aux outlet from the Link ECU.
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