Won't hurt a thing going with the larger pump, you won't notice a difference at all
Thank you sir. This was my initial gut feeling, but I started googling, which only led me to question the decision more. 😆
It's about the last part I have to buy to get it running. I know you've had 1 in the Malibu without problems for awhile so that's great to know.
Too big and you run the risk of overwhelming the return line. But I have a 340 in the tank of my 97 K3500 dually and it's not causing any pressure creep at low demands. I could have gone smaller, but I went with the AEM as the local shop was having issues with other brands and they got me that one in a day for the same price as online.
Awesome that's what I was wandering if the bigger pump would cause. Now I'm on to deciding between the holley drop in kit or build my own.
Agree with
Streetbu
For a single there is no reason to go with anything smaller than a Walbro 450. For the price and effort required, it's truly a performing and reliable pump. I'd recommend steering clear of the Holley 'drop in' setups only because the majority of the price is for the name. But to each his own - I'm sure the Holley will work.
Regarding a 450 being enough for 10 psi - I would say that is the safe limit with a reasonably sized turbo on a 300-400ci motor. Really need more information on the setup to make an educated recommendation with boost.
I appreciate the advice. I try to be anti drop in or all in 1 kits buying guy, but It's the same price as a new stock style setup actually cheaper.
I can build a new setup ... efi tank,modified sender,450,boost reference fpr for about 550$ without buying Chinesium fpr/pump.
So the returnless drop-in module seemed to make the most sense @ 450$. They even have some replacement parts for them, but the fpr isnt boost referenced. And the pump may be too small anyway But.....
I've also read internet stories of guys getting away with a returnless system w/o boost referencing fpr at lower boost levels <15psi, and running 10-14psi with aø 350lph looks doable According to my mAtH. I'm assuming they rate it at 40psi, so @58psi it should be around 300lph. This is a guess since I dont know how to come up with the exact conversion.
The engine is a 6.0/706 heads, ss2 cam, LT headers, 50/lb@58psi injectors, returnless rails ,gen 3 truck intake. No turbo currently, but I'd probably put something like the vsr7875 on next yr.I never considered the drop in modules fpr not being boost referenced and the difference in what power a pump can supply N/A vs FI until today.
Depending what efi sender you get it may or may not be in wired to supply the amperage a big pump demands. I don't know what Holley does. I assume it's designed to supply the bigger pump but I don't know, never seen one in person.
At high pressure a 450 pump can draw more amps then the stock efi turbo Buick or efi Monte sender can honestly supply. Pulling big gauge wire from the battery/relay bank under hood is fine but the small OEM style sender wiring is suspect to get hot or result in enough voltage drop that the pump will not pump it's full capacity.
From a flow sense 3/8 or #6 hose will flow enough for a single 525, beyond that the flow velocity gets high and it takes a lot of additional pressure at the pump to get the desired flow at the engine. Below a 525 the pumping loss is not significant.
Thanks, I've seen your video on the efi tank and bulkhead wiring. Very good stuff. If I go the stock style route, I'll definitely be copying your bulkhead wiring upgrade. Anybody who is should check this video out.
81cutlass is giving
oldsofb a run for best forum youtube channel. I didnt find it until a few months ago, has a bunch of good info.
We should have something easy onsite to compile the channels on here so they're easy to find.
It's funny, I've had my mind made up on what to buy for a year, but when the time comes I'm trying to change it.
If I had no desire to upgrade later, the drop in would be a no Brainer but I highly doubt that will be the case.
I'm either gonna get the 350lph kit or build my own, I'm undecided but leaning towards the kit still.
Thanks for the advice fellers, if you have any more regarding the use of the 350lph kit on a turbo setup I'm all ears.
www.holley.com
