2G Out of fuel pump. Need suggestions

[Jacolu3]

Has anyone fit the 525 pump in a 2G pickup assembly yet?

I waiting to find out myself. If I were to guess, some modifications would need to be done to fit.

 

[Vegas Smith]

Somebody on the s2000 forums said they are identical when holding them together.

 

[Jacolu3]

Somebody on the s2000 forums said they are identical dimensions when holding them together.

That's good to know. That would be a quick temporary fix for me until I get a fuel cell

 

[Jacolu3]

Well I was wrong. I don't have the high pressure 450. Not sure how big a difference that makes but I'm sure it makes a difference.
But my pump is definitely wired with 10 guage wire.

 

[Vegas Smith]

Don't quote me on this but I searched around for some comparisons and found it could be up to a 13% difference at your boost levels. I would check for yourself though as I searched around pretty quickly.

 

[donniekak]

The high pressure version, or modded regular version has put numerous cars into the 700’s.

 

[Jacolu3]

The high pressure version, or modded regular version has put numerous cars into the 700’s.

Is that on E85?

 

[donniekak]

Is that on E85?

https://www.k20a.org/forum/showthread.php?t=186865#/topics/186865

 

[Jacolu3]

https://www.k20a.org/forum/showthread.php?t=186865#/topics/186865

That's odd because I have the same model # pump. I wonder why my pump couldn't get pushed as much.

 

[Jacolu3]

So I decided to order the new wally 525 to see how it does. Should probably be able to install it next weekend and test it out.

 

[spyve4]

Good decision. Make sure to update the thread so we can all see how the install goes.

 

[punk3rz]

OP: Check out my thread on installing a 450.
If you’re having a lean condition at WOT, it’s more than likely due to the seals not holding.
The fix is putting a bulkhead fitting on the pump housing eliminating the issue.
I would also recommend installing a fuel pressure sensor to verify your fuel pressure.
Look over this thread if you have any questions:
http://www.dsmtuners.com/threads/walbro-450-install-w-bulkhead-fitting.519232/

 

[Jacolu3]

OP: Check out my thread on installing a 450.
If you’re having a lean condition at WOT, it’s more than likely due to the seals not holding.
The fix is putting a bulkhead fitting on the pump housing eliminating the issue.
I would also recommend installing a fuel pressure sensor to verify your fuel pressure.
Look over this thread if you have any questions:
http://www.dsmtuners.com/threads/walbro-450-install-w-bulkhead-fitting.519232/

This is exactly what I'm planning on doing this weekend!!
Great writeup!!

 

[Jacolu3]

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So I went ahead and put the new wally 525 in with a -6 bulkhead. Some people are telling me that I should go with a -8 line but I'm going to test it out with the -6 for now because I already had it installed.
The 525 and the 450 seem to be identical or pretty close inside so the install is the same for a 450 or a 525. I just did one quick 2nd gear pull so I really don't know how much better it will perform. I plan on hitting the track next weekend for some testing so that's when I'll know for sure.

 

[Talon96fwd]

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That’s weird because I made 630hp to the wheels on a single walbro 450 and that was being conservative

 

[Talon96fwd]

This was on E85 and the newer version of the Walbro 450.

 

[Jacolu3]

This was on E85 and the newer version of the Walbro 450.

What was your fuel line setup?
Stock?
-6?
-8?

 

[Talon96fwd]

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So originally with the stock line I made 550hp. Then I upgraded the feed line to a 6an. But still on the stock return line.

This Dyno graph is with the stock fuel feed line

 

[Talon96fwd]

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With the older model Walbro 450 I max that out at exactly 500hp. As you can tell I been threw some fuel pumps .

 

[Vegas Smith]

Are you saying that the stock feed line limited you?

 

[OH91awd]

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So I went ahead and put the new wally 525 in with a -6 bulkhead. Some people are telling me that I should go with a -8 line but I'm going to test it out with the -6 for now because I already had it installed.
The 525 and the 450 seem to be identical or pretty close inside so the install is the same for a 450 or a 525. I just did one quick 2nd gear pull so I really don't know how much better it will perform. I plan on hitting the track next weekend for some testing so that's when I'll know for sure.

6an should be good to around 6-750hp range. i only ran 8an on mine because we had a sale on the 8an e85 vibrant line at work.

 

[spyve4]

Are you over running the stock return with the 525?

 

[Talon96fwd]

Are you saying that the stock feed line limited you?

Correct i was stuck at 550hp but just a swap of the feed line made that that difference.

 

[Jacolu3]

Are you over running the stock return with the 525?

I'm actually using the stock feed line as my return line because it's a little bigger

 

[Strm Trpr]

Any updates on your fuel system?