my new project

[4seasons69]

Originally Posted by bramagedained

You can borrow my Aeromotive FPR, if you have the fittings to use it.

Your fuel feed/return stuff is all AN right?

That would be awesome! Yeah its all an stuff. As long as it has -6 inlets and outlet I can use all the fittings from mine

[blackawdtsi]

Originally Posted by Murlo26

Could it maybe be a fuel pickup issue too? Clogged filter somewhere?

Also, the numbers you showed on the wally450 seem WAY low, I wouldn't be so sure that the 450 you used was working right.

It's actually right on the nuts.

[asshanson]

When you flow tested the pumps, were they out of the tank? What did you use to force the 90psi, your regulator? Why not test the flow with everything in the car, so you are testing your lines, etc.

[Murlo26]

Originally Posted by blackawdtsi

It's actually right on the nuts.

I guess I am just surprised it wasn't higher compared to the 255. I honestly didn't even do the math or check the flow ranges that it was supposed to be. I know the wally 450 has WAY more flow in it compared to a 255 so percentage wise it seemed quite a bit lower than I would've thought.

[4seasons69]

Originally Posted by asshanson

When you flow tested the pumps, were they out of the tank? What did you use to force the 90psi, your regulator? Why not test the flow with everything in the car, so you are testing your lines, etc.

The pumps were intank. I just popped my return line off of by my regulator and ran it into a container. We used my regulator to up the pressure to 90psi. So these flow tests were done through the fuel system in my car

[blackawdtsi]

Originally Posted by Murlo26

I guess I am just surprised it wasn't higher compared to the 255. I honestly didn't even do the math or check the flow ranges that it was supposed to be. I know the wally 450 has WAY more flow in it compared to a 255 so percentage wise it seemed quite a bit lower than I would've thought.

The test was for max boost. 90psi - 43.5 = 46.5

35psi of boost would've been 78.5psi where there is a giant difference between the 255hp and the 450. The 255 would do about 185 lph and the 450 would do 230ish lph.

The fact that Shawn was only on 35psi and with the obvious difference in flow between 2 255s and 1 255 w/ 1 450, shows that something is restricting the flow or the FPR diaphragm is toast.

[asshanson]

Originally Posted by 4seasons69

The pumps were intank. I just popped my return line off of by my regulator and ran it into a container. We used my regulator to up the pressure to 90psi. So these flow tests were done through the fuel system in my car

Bizarre. So you really shouldn't have any restrictions or a faulty regulator, because you proved the system will actually flow what it should at 90psi.

Are you sure you're getting full boost pressure in the vacuum line to the regulator? Or maybe the regulator can do a static 90psi but when set to 40ish and then the added boost it can't up the pressure like it should? A good test would be to set the regulator to base pressure, and then use the vacuum line to add the additional 40psi. Just a thought.

[Shane@DBPerformance]

That's a good idea.

[4seasons69]

Originally Posted by asshanson

Bizarre. So you really shouldn't have any restrictions or a faulty regulator, because you proved the system will actually flow what it should at 90psi.

Are you sure you're getting full boost pressure in the vacuum line to the regulator? Or maybe the regulator can do a static 90psi but when set to 40ish and then the added boost it can't up the pressure like it should? A good test would be to set the regulator to base pressure, and then use the vacuum line to add the additional 40psi. Just a thought.

Originally Posted by Shane@DBPerformance

That's a good idea.

That's a really good idea. I'll try that sometime this week

[bramagedained]

You can come pick up the regulator any time. It had pushlok lines, you should be able to unscrew the AN fittings from your regulator and put them on mine.

[4seasons69]

Originally Posted by bramagedained

You can come pick up the regulator any time. It had pushlok lines, you should be able to unscrew the AN fittings from your regulator and put them on mine.

Okay cool! I'll text you in a little bit

[turbotalon1g]

pickup the coveralls he has for me too!

[4seasons69]

Okay so I tried a new fpr last night and the fuel pressure issue is still there. At this point I'm probably just going to redo the whole system from the ground up.

Also the turbo is very large between gears. There is no bleed hole in my boost controller Shane said that could cause some issues so I will be replacing that.

So the car is pretty much done for this year. I'm just sick of shelling money into it.

Plans for over the winter are a new fuel system, new mbc, I would like to have my exhaust manifold redone for a second wastegate or get a new manifold, I'd also like to have 4th gear replaced if I can too.

[asshanson]

Did you also try the test I recommended? Maybe also put a gauge on the vacuum line at the regulator to verify its seeing the right pressure.

[4seasons69]

Originally Posted by asshanson

Did you also try the test I recommended? Maybe also put a gauge on the vacuum line at the regulator to verify its seeing the right pressure.

No I didn't. Didn't have enough time last night. I'm going to when I have some time to work on it. A gauge on the line going to the regulator is a good idea.

[dsmreck]

whats the point of two wastegates and the hole in the boost controller

[4seasons69]

Originally Posted by dsmreck

whats the point of two wastegates and the hole in the boost controller

My turbo is a twinscroll t4. The divided t4 is supposed to spool faster than an open t4 but requires two wastegates one for each side. When you run a single wastegate on a divided turbo it basically negates the effect of the divided housing and increases lag.

Not really sure on the bleed hole in the boost controller. It's supposed to be there. Shane was telling me it can cause a lot of lag between shifts as well as other issues.

[93gtpeater]

.

[dsmghost]

"There is a bleed hole on the boost controller after the ball, to allow the pressurized air that would be trapped between the wastegate actuator and the ball after it is seated again"

http://en.m.wikipedia.org/wiki/Boost_controller

[dsmreck]

oh ok so pre 02 housing than. the whole boost controller thing has me wanting to chrck mine now. also is there a reason or fix for flutter ie mine would flutter from 26-27 on its way to 30. shane mentioned it but i never asked why. i just assumed my turbo was on the way out. dont want to hurt my new turbo now.