Walbro 450 vs 525
Thread Starter
Joined: Dec 2004
Posts: 235
Likes: 12
From: Buffalo
Walbro 450 vs 525
Has anyone compared them dimensionally? Modern Automotive Performance says they are the same - some sites say the 450 is 121mm long while the 525 is 131mm. Will the 525 fit the SoS bracket?
edit - after holding both at the same time they are identical in dimensions.
edit - after holding both at the same time they are identical in dimensions.
Last edited by MrSmith; Aug 2, 2018 at 06:39 PM.
Joined: Mar 2010
Posts: 1,685
Likes: 79
From: Los Angeles
Damn i recently upgraded to the 450. Wonder what the actual fuel delivery differences are between the two pumps...also brushless pumps are right around the corner too but for my power goals the 525 might be enough.
Joined: Aug 2016
Posts: 1,154
Likes: 183
From: US129 Maryville, TN
I too am in the market to upgrade the fuel pump solution as im dropping in a new motor and going for mid 700hp. I'm currently on a 450 running E85. There is a chart somewhere that shows the flow difference. IMO the cost and headache of changing out the pump just isnt worth it. I'm going to go keep my 450 and add on a boost-a-pump, which I would have to do anyway with the 525. Cheapest and easiest solution as long as the wiring is up to the task, which mine is.
Thread Starter
Joined: Dec 2004
Posts: 235
Likes: 12
From: Buffalo
Here is an article comparing them:
https://www.maperformance.com/blogs/...uel-pump-guide
I am upgrading from a 255 for me spending the extra $32 on the 525 vs the 450 is a no brainer as long as the fitment is the same. Newer tech better output odds are team China hasn’t made a copy yet possibly less of a chance getting a fake.
https://www.maperformance.com/blogs/...uel-pump-guide
I am upgrading from a 255 for me spending the extra $32 on the 525 vs the 450 is a no brainer as long as the fitment is the same. Newer tech better output odds are team China hasn’t made a copy yet possibly less of a chance getting a fake.
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Joined: Aug 2016
Posts: 1,154
Likes: 183
From: US129 Maryville, TN
Here is an article comparing them:
https://www.maperformance.com/blogs/...uel-pump-guide
I am upgrading from a 255 for me spending the extra $32 on the 525 vs the 450 is a no brainer as long as the fitment is the same. Newer tech better output odds are team China hasn’t made a copy yet possibly less of a chance getting a fake.
https://www.maperformance.com/blogs/...uel-pump-guide
I am upgrading from a 255 for me spending the extra $32 on the 525 vs the 450 is a no brainer as long as the fitment is the same. Newer tech better output odds are team China hasn’t made a copy yet possibly less of a chance getting a fake.
Joined: Sep 2012
Posts: 342
Likes: 16
I have these. not much more flow than the 450s, but a lot more amp draw. I had to upgrade all my wiring, should have been done the 1st time, but i digress.
these are the exact same size of a 450
Im somehow maxxing my injectors out right now though with 2 470s and id2000's. going to play with base pressure to see if that helps
flow comparison:
https://bmw.spoolstreet.com/threads/...shootout.3538/
these are the exact same size of a 450
Im somehow maxxing my injectors out right now though with 2 470s and id2000's. going to play with base pressure to see if that helps
flow comparison:
https://bmw.spoolstreet.com/threads/...shootout.3538/
Joined: Aug 2016
Posts: 1,154
Likes: 183
From: US129 Maryville, TN
I have these. not much more flow than the 450s, but a lot more amp draw. I had to upgrade all my wiring, should have been done the 1st time, but i digress.
these are the exact same size of a 450
Im somehow maxxing my injectors out right now though with 2 470s and id2000's. going to play with base pressure to see if that helps
flow comparison:
https://bmw.spoolstreet.com/threads/...shootout.3538/
these are the exact same size of a 450
Im somehow maxxing my injectors out right now though with 2 470s and id2000's. going to play with base pressure to see if that helps
flow comparison:
https://bmw.spoolstreet.com/threads/...shootout.3538/