Evo X upgrades - Page 95

**scheides** · 05-28-2011

Hrm you're starting to make me wonder if I shouldn't try this on my car. I have no idea what fuel pressure is though...if it is super high that would make sense why my fuel system is dropping off up top.

**mlomker** · 05-28-2011

Definitely recommend a fuel pressure gauge--so useful and a simple inline one is like $30. If your pressure is always too high then you will burn up the pump. There are guys that have gone through 3-4 Walbros before this issue was solved.

You would not believe how small the hole is in the return for the suction line. Holy shit! It is literally a pinhole. How the hell even the stock return fuel got through that is beyond me. Here it is AFTER I drilled it out to 5/64ths.

What the part looks like. You need to give it a really good tug to get it out of the hanger.

**mlomker** · 05-28-2011

Okay...I spent the last few hours going up one drill bit size at a time and the results were pretty predictable.

5/64ths: ~2psi
Port filter holder: ~2psi
Remove filter: ~1psi
3/32nds: ~2psi
7/64ths: ~2psi
1/8th: ~2psi

I'm now at the proper pressure at idle. I'm not going to worry about the filter since I have an inline under the hood. 1/8ths happens to be diameter of the top side of the tube so the solution was to just drill it out.

I'll have to see if the suction is still working but seeing how I went one bit a time, I think it will.

**mlomker** · 05-30-2011

Installed the Weldon 2015 and controller today. That thing is so badass...

93gtpeater · 05-30-2011

Car up and running now? Dumb question is that a wash bottle in the trunk? if so is that where they are from the factory?

**Kracka** · 05-30-2011

Yup, washer fluid and the battery are in the trunk from the factory. Normally they're hidden with plastic paneling, but this trunk is stripped.

**mlomker** · 05-30-2011

Had the car running Friday morning...took me a few days to figure out my issues with the switch back to a stock in-tank setup. Today I installed the Weldon and it appears happy.

It'll obviously need a re-tune after all of this. Next thing is to get on Shane's schedule...

**Murlo26** · 05-30-2011

Looking good! Are you hoping to get tuned before MAP's event?

**scheides** · 05-30-2011

Quote:

Originally Posted by mlomker

It'll obviously need a re-tune after all of this. Next thing is to get on Shane's schedule...

Just use your standalone logging setup to log fuel trims for now and if shane can't fit you in maybe I could trade you some street tuning time (should be pretty basic, you have a wideband right?) in exchange for letting me try out that aeromotive/jay's 255 drop-in?

Should be pretty simple as it'd just be dialing in AFRs.

**mlomker** · 05-30-2011

Quote:

Originally Posted by Murlo26

Looking good! Are you hoping to get tuned before MAP's event?

If his schedule permits otherwise I'll ask scheides for some help! I basically just need to make sure that the fueling is conservative with the new setup.

Quote:

Originally Posted by scheides

Just use your standalone logging setup to log fuel trims for now and if shane can't fit you in maybe I could trade you some street tuning time

Not sure how accurate the PLX gauge is since I have more oil blow-by than most folks. I would love to wire that gauge into my ECU sometime this Summer, if you have the time to give me a hand.

**mlomker** · 06-01-2011

Awesome! I'm on Shane's schedule.

I have a mild fear that the Weldon 2015 won't be big enough but that's only because the X is so bizarre about its pump needs. This pump is rated for 1000bhp so it should be good into the 500s@DB on E85.

I lowered the flow using the dial-a-flow controller before driving to work this morning. It looks like I was out-flowing the capacity of the 1/4" return line a little bit since fuel pressure dropped 2-3psi. It's sitting right at 43 now, which is a good spot for it. Just need the fueling adjusted to match.

**mlomker** · 06-08-2011

Torqued that oil feed banjo bolt and it tightened 1/4 turn. It'd be nice if that were the issue.

I changed the oil and left the under-tray off for Friday's visit with Shane. I can't tell if the Hobbs switch is kicking the pump into high gear or not. The car gets so loud during a pull that I'm not going to hear the pump change speed. I've done a couple half-pulls to 15psi and the AFRs look good @11.2-11.3.

**scheides** · 06-08-2011

That's good! Hopefully it stays that way. Does the Weldon controller operate a dual voltage setup then?

**mlomker** · 06-08-2011

Quote:

Originally Posted by scheides

Does the Weldon controller operate a dual voltage setup then?

Not quite, it's an interesting device. It uses some sort of pulse modulation to limit the current but it always operates at the same voltage. You use a pot to adjust the amount of current sent to the pump at idle and then you send voltage to a terminal to trip it into full current. They say it is a 0.5v drop vs alternator voltage at 20amps.

**mlomker** · 06-09-2011

It feels like Xmas Eve to me. I want this car done so bad.

I actually have as many spectator events planned for this season as driving. ChumpCar fascinates me. I'd love to join a team next year.

**mlomker** · 06-10-2011

The Weldon worked perfectly from the first pull. The fuel tested as E81.

I was a bit surprised by the number for my 30psi tune. We dialed in my normal 25psi tune at 440whp.

I'll scan the sheets after work.

**scheides** · 06-10-2011

Impressive peak numbers and even more impressive powerband. WOW! Congrats dude!

93gtpeater · 06-10-2011

Dam those are some very nice number for a motor with low compression. Your car has an awesome power band. Hope I can get a ride in it sometime.

**mlomker** · 06-10-2011

Quote:

Originally Posted by 93gtpeater

Dam those are some very nice number for a motor with low compression.

Mark Leasure was there to get his IX tuned after me. He was saying that he prefers lower compression and turning up the boost. I'll just drive it if the compression numbers remain where they are (115-ish).

Speedfreak · 06-10-2011

Drive it until it smokes enough to bother you, then rebuild. No need until then. Mark is right, it's what I suggest, and I know Shane has said similar in the past as well.