I kept my walbro 450 and added a 525 hellcat

Ah, so I'm guessing that one pump isn't going to cut the mustard for me.

Honestly I think it depends on your fuel set up as a whole. Seethroughead is wanted to get up to 650 on pump which the 1050cc should be enough as long as he has the rails to go with it. (Although 580 to 600 may be a better number).

redondoaveb ran out of duty cycle but keep in mind he was running on e85 so takes more volume/fuel to get the same numbers that's why he needed bigger injectors and pumps.

I hit 650 with rails and the hellcat pump running 1300cc injectors at under 80% cycle.

Keep in mind you are be going to want to move volume over pressure. I feel like you shouldn't want the pumps fighting each other. But again depends on your setup as a whole unit

See Birdiev post :tiphat:

Yeah fair points. I hadn't planned on changing the fuel rails, but I do have 1300cc injectors already so maybe I should reconsider. $1400 on fuel pumps alone seems pretty insane, but I know I gotta pay to play. I might run with 1 pump and see how far Eugene can take it and then decide down the line if I want bigger numbers.

Just spend the money one and buy a brushless pump. 1 pump will take care of everything. You won’t make enough HP to out flow the brushless pump

It's easy to determine if you need bigger injectors by looking at it's duty cycle, but my question is, How can you determine you need to upgrade fuel rails? I mean what values should I look at to know that the rails are at top capacity?

Think of it this way; bigger rails, more fuel, probably lower duty cycle on the injectors. 3" fire hose puts out a fire faster than a 3/4" one. :tup:

Honestly, I would go with a single 450 or 500 and just add the Boost-a-pump. No need to unnecessarily heat up your fuel unless those brushless pumps dont create as much heat. These things are pretty trick as they only kick in when they see 3psi of boost.

I bet a 450 with a KB-BAP would flow enough for 800+whp and cost $400. I think those brushless pumps are well over $1k.

We made 710whp on that setup with stock rails and fuel pressure didnt drop one bit.

Eugene is suggesting I run a DW440 brushless pump. I'm looking at the Radium website that talks about flow vs amp draw and the TI brushless they sell draws very little current for the amount it flows so it's probably going to heat up a lot less. Looks like it's around $600 for one, but of course there are a lot of ways to skin this cat.

Also I just noticed that injector dynamics has a fuel flow calculator on their website too. Even with 20lbs of boost and E85 they're only calculating 355lph at redline. Does that seem low to people?

Blog Post Radium's Ultimate Fuel Pump Test

this is a pretty good explainer on how to pick your pumps

you can see that the brushless pump (BKS1000) provides the most flow. more than enough for anything on this platform afaik. even at a high boost of 25 psi (assuming your build can even stand that) the BKS1000 needs to output around 80 psi (55 + 25) and will still flow 550lph and only draw 12 amps

Yeah that’s a good resource for sure. There’s also a blog post about ID creating a controller specifically for that pump that puts out crazy flow as well. It’s funny that brushless motors have been in a ton of applications for years and they seem to just be hitting the fuel pump market. My Ryobi impact drill from like 6 years ago is a brushless unit, for instance.

Whoever owns this TG C38R G37 car… Good work sir.. siiiick. https://youtu.be/AzUHehiSufY

Yes, very well done video and great build. Hopefully you run across that same turbo Z you raced before in your comments. But I'm sure he will know your boosted now. No way of hiding that...lol.. :driving:

Loving these flat torque curves!

Funny thing is I actually won as difficult as that sounds. we did three runs. As soon as we got on it I would start to pull away. When I was about 3 or 4 cars ahead that 370 turned into a rocket . I thought that car was literally going to blow my doors off.He made it to about the back of my door until he shifted and then I started to pull again. Then again rocket time for him but to my back bumper. Every time he shifted I would pull but that car sounded like a monster catching up.

Not sure if that was turbo lag or too big of a turbo ,and yes he got the hit on one because I wanted to make sure.

That's when I knew supercharger was the way to go because I was enhancing what I already had.

I've always thought the driver with the best start or launch will have the advantage.As it then becomes a catch up game depending on power levels. power curve has alot to do with it as well.

This supercharger is INSTANT power as soon as you get on the throttle. No regrets with this kit.