Andrewhans 7875/4.8/MS3 Gold Sedan

[Pillow]

Good luck man!!! Keep us posted on the low timeslips Get those slicks to hook on the warm tarmac.

[740atl]

Originally Posted by Andrewhans

Got the final piece of the fuel pump puzzle. Going to have the MS3 GoldBox trigger this at 4-5psi to boost voltage to the pump. Going to turn the voltage back down to very slightly above normal. I want 13.9-14v at hot idle. When triggered this will boost voltage to 17.5v at the pump only. We will see how much it shorten pump life but this is the go to method for some other chassis that have a pump that is near the edge of being not enough.

12v in from Batt on fused(40a) red, good chassis ground on black, direct pass through when off on orange and when triggered orange outputs 17 ish volts. Ground trigger is Brown. DC-DC converter with passthrough.

Andrew what does the fuel pump booster do? Does the increased voltage correlate with increased pump output?

btw, lovin the build.

[volvo?]

Originally Posted by 740atl

Andrew what does the fuel pump booster do? Does the increased voltage correlate with increased pump output?

btw, lovin the build.

That is what it does.

[740atl]

Originally Posted by volvo?

That is what it does.

I might be answering my own question again, but if the pump output is increased at the same kPa/RPM, then that is something that would require less VE at the same kPa/RPM which means a bit of retuning.

Is the voltage output of the multipler consistent?

Was the choice to go with the pump multiplier instead of larger injectors?

[linuxman51]

moar volts is betters. if the ecu can handle it, coils hit harder, injectors work faster, pumps pump more.

[Andrewhans]

Originally Posted by 740atl

I might be answering my own question again, but if the pump output is increased at the same kPa/RPM, then that is something that would require less VE at the same kPa/RPM which means a bit of retuning.

Is the voltage output of the multipler consistent?

Was the choice to go with the pump multiplier instead of larger injectors?

Cheaper to get this booster($100 used of CL)

Voltage output is constant 17.5v independent of input voltage(to a point obviously) when activated.

Im triggering the booster prior to when I was loosing fuel pressure before. So that area is fine but the part of the map that was overcompensating on the pulse width to bring my AFR back in line is now overly rich.

Back to the updates!

New best time! 7.5 @103


Left the line at idle and floored it right away. Viewing the datalog I seem to be lifting as boost comes up in first gear. Not sure why though I dont remember lifting at all...

This was at 12psi 13ish deg timing on e85. Going to turn the boost up to 15psi and make a few more passes. Got some great datalogs too of the Boost-A-Pump working great prefect fuel pressure the entire pass.

My wife took a few videos for me. Had a blast last night.






Overall great time.

[Andrewhans]

Originally Posted by linuxman51

moar volts is betters. if the ecu can handle it, coils hit harder, injectors work faster, pumps pump more.

Couldnt agree more. I had the system voltage overboosted too much. 15.4v cold and 14.8v hot. I felt like eventually I was going to cook the battery so I lowered the voltage. Now its around 14.8v cold and 14.4 hot which is perfect IMO. Under full song it drops to 13.8v and I only have a .3v drop from batt to fuel pump relay output post and 17v output of the actual boost a pump.

The walbro 450 is an animal when fed the proper voltage.

[Pillow]

That last video coming around the Mustang was beautiful!

Sorry if I missed it, but why not leave harder? What stall converter RPM? Traction? trans brake? And I say that because you all pulling all of them on the back half. Once the launch is perfected, you are going to make some people cry looking at your taillights!

[cosbySweater]

Did you verify the timing???

[Andrewhans]

Originally Posted by Pillow

That last video coming around the Mustang was beautiful!

Sorry if I missed it, but why not leave harder? What stall converter RPM? Traction? trans brake? And I say that because you all pulling all of them on the back half. Once the launch is perfected, you are going to make some people cry looking at your taillights!

Working up on the boost off the line. Also I just got to the point where I can floor it in first and not spin the tires. Now that I have that down Im gonna turn the boost up and try and brake boost a bit to leave a bit harder. No transbrake, unsure on stall number. Its a custom spec'd unit from PTC, works amazing.

Once the launch is dialed, its gonna be mean at the track.

Originally Posted by cosbySweater

Did you verify the timing???

Not yet. I need too, but I've been too lazy. I need to find the right kind of timing light too. I have a fixed one the just flashes, no dialback or readout.

[Pillow]

[QUOTE=Andrewhans;5822600]Once the launch is dialed, its gonna be mean at the track./QUOTE]

Yes it will!

[Andrewhans]

Got the 2 step working. First video is 2500rpm and -2 timing second video is 3800rpm and -4 deg timing.




Didnt really do mich better. Im traction limited. The open diff is ****ing me on the burnout and at the 60'. I dont want to weld it bc I drive it on the street quite a bit and don't want it to be miserable and destroy the bushing back there any more than they are lol.