[randyf32]

Hey guys, so I've done quite a bit of research and am finding too many mixed opinions with my PS2 should I upgrade the LPFP or the HPFP?

My goal is to make about 425WHP

ideally I would just want to do this with pump gas if possible.

Long story short, what would supplement a PS2 better to achieve this goal

a upgraded LPFP or HPFP?

[Eschmacher]

You can achieve that goal without a fuel pump upgrade. The PS2 should make that on stock fueling. If you want to go higher, then you'll want upgraded HPFP.

Also, upgraded LPFP is rarely needed. Main case would be port injection.

[mike@x-ph.com]

As mentioned, you can achieve this power without the upgrade.

[thejeremyman9]

Originally Posted by Eschmacher

You can achieve that goal without a fuel pump upgrade. The PS2 should make that on stock fueling. If you want to go higher, then you'll want upgraded HPFP.

Also, upgraded LPFP is rarely needed. Main case would be port injection.

This is correct. A PS2 with FBO should be able to make low 400whp. You will likely be right around the limit of the stock HPFP, even with pump gas. A OTS stage 2h tune might get you there. Not sure a custom tune would be worth it with stock HPFP since there wont be much more left on the table.

LPFP upgrade is not needed unless you want to run PI. With a PS2 + FBO + HPFP, you can get into the 500whp range, but will need a custom tune.

[Logicoeur]

With that 400 number, is the ps2 still in its efficiency zone, is it working really hard?

[Tpriest7893]

Ps2 and a nice tune and your solid. Hit up Munchi435 he's got a great set up and could give you some advice

[thejeremyman9]

Originally Posted by Logicoeur

With that 400 number, is the ps2 still in its efficiency zone, is it working really hard?

A PS2 will not be working hard to achieve low 400whp numbers. PS2 would be capable of low 500s without a problem (supporting mods of course).

Low 400s is where you start pushing OEM EWG turbo close to 100 WGDC and out of its efficiency range.

[Marlinman]

the limiting factor would be the HPFP anyways, so you would upgrade that before the LPFP; I support what others are saying though, for your goals you can run stock fuel system especially on EWG.

[randyf32]

Thank you all for your help, I will be getting the PS2 with just the DV+ for now and upgrade HPFP if the need arises.

[Eschmacher]

Originally Posted by randyf32

Thank you all for your help, I will be getting the PS2 with just the DV+ for now and upgrade HPFP if the need arises.

I'd honestly recommend the turbosmart DV over the GFB. It's a direct replacement rather than an addition to the stock one.

[thejeremyman9]

Originally Posted by Eschmacher

I'd honestly recommend the turbosmart DV over the GFB. It's a direct replacement rather than an addition to the the stock one.

I would consider the same. There seemed to be some potential issues with the GFB needing maintenance/wearing out over time.

Also, get an inlet as well. So far the MST seems like the best option. Make sure you get the "v2" with the larger diameter metal piece.

[ozymandias435]

Originally Posted by randyf32

Thank you all for your help, I will be getting the PS2 with just the DV+ for now and upgrade HPFP if the need arises.

Like the posts right above this one, I also recommend the Turbosmart Plumb Back version. I installed mine a few months back and have been pleased with it for sure. Reading about the maintenance of the DV+ steered me towards the Turbosmart. This is not a part you will ever want to remove/reinstall again after you get it put on the turbo. Major PITA install/removal!

[theEZV]

If you're going to spend all that $ for the PS2 and supporting mods, just get the HPFP. Now that there are relatively affordable options on the table, why would you not? If you're investing in a bigger turbo, do it right the first time. That way you have headroom and can get the car set up/tuned properly.

Seriously, we have a gazillion logs posted here every week and everyone is always freaking out about the HPFP not keeping up. Don't be that guy.

[bobalis]

I don't mean to hijack OP's thread but I am trying to achieve the same results with my 2014 435 but I was comparing PS2 with a speedtech kit. For trying to get low 400s WHP, would they be very similar? My goal is to achieve similar gains as OP but also keep spool as close to stock as possible. Any insight would be much appreciated.

[thejeremyman9]

Originally Posted by bobalis

I don't mean to hijack OP's thread but I am trying to achieve the same results with my 2014 435 but I was comparing PS2 with a speedtech kit. For trying to get low 400s WHP, would they be very similar? My goal is to achieve similar gains as OP but also keep spool as close to stock as possible. Any insight would be much appreciated.

If you want spool and are not shooting for big numbers, go for PS2 over speedtech. The speedtech is more of a "stage 3" or "big turbo" option.

[1QuikWS6]

Another vote for Turbosmart DV over GFB with PS2

I had a GFB and decided to sell on the forum b4 install and went with TS

I run PS2 with mods in my sig, no HPFP or LPFP, custom Cary Jordan BM3 93 octane Stg2 tune and make >400 HP easily. No fueling problems yet. I do add Boostane Shot in hot summer months to kick the octane up another 3pts, but that has nothing to do with supply pressure...

[randyf32]

Originally Posted by ozymandias435

Like the posts right above this one, I also recommend the Turbosmart Plumb Back version. I installed mine a few months back and have been pleased with it for sure. Reading about the maintenance of the DV+ steered me towards the Turbosmart. This is not a part you will ever want to remove/reinstall again after you get it put on the turbo. Major PITA install/removal!

Will go for the turbosmart seems like this is the way to go. Also I already have a BMS inlet is it worth changing out for a MST or pure inlet? I wasn't planning on it but in terms of the HPFP will I really see rail pressure drops? I would be using 94 AKI only where I live probably on the ACN 91 OTS Stage 2H map for BM3. I was considering a custom tune but seems like it won't be worth it for what I'm trying to achieve. But if my HPFP wont be able to even handle the OTS map then I will add it to the list..

[ozymandias435]

Originally Posted by randyf32

Will go for the turbosmart seems like this is the way to go. Also I already have a BMS inlet is it worth changing out for a MST or pure inlet? I wasn't planning on it but in terms of the HPFP will I really see rail pressure drops? I would be using 94 AKI only where I live probably on the ACN 91 OTS Stage 2H map for BM3. I was considering a custom tune but seems like it won't be worth it for what I'm trying to achieve. But if my HPFP wont be able to even handle the OTS map then I will add it to the list..

I will have a better answer for you regarding the inlet on Monday. Have done extensive inlet testing and the BMS is the final inlet to be tested. I will say that I have had some nice results from the MST so far and it is clearly in the lead at the moment as the best inlet option available.

[xnick101]

I could be wrong but can't you just run port injection for increased fuel and leave the hpfp stock?

[Logicoeur]

Yeah speed tech looks nice since it uses a BorgWarner EFR. Even the smallest turbo (7064) is bigger than the PS2?

[thejeremyman9]

Originally Posted by randyf32

Will go for the turbosmart seems like this is the way to go. Also I already have a BMS inlet is it worth changing out for a MST or pure inlet? I wasn't planning on it but in terms of the HPFP will I really see rail pressure drops? I would be using 94 AKI only where I live probably on the ACN 91 OTS Stage 2H map for BM3. I was considering a custom tune but seems like it won't be worth it for what I'm trying to achieve. But if my HPFP wont be able to even handle the OTS map then I will add it to the list..

You should be able to run the OTS maps without a HPFP upgrade, the bM3 is known to tune right to the edge of the fuel system limit, so just make sure you log.

Genreally speaking I would also say to install a HPFP along with the turbo upgrade because you are leaving so much on the table without it, but if you dont want to make big power, it might not be necessary. Plus, it doesnt really save you labor to install HPFP with turbo, so you can always add it later if you want/need it.

Originally Posted by xnick101

I could be wrong but can't you just run port injection for increased fuel and leave the hpfp stock?

Sure, but this approach doesnt really make sense, especially when OP is trying not to modify the fuel system. There's not really any reason to add all the extra complexity of installing PI, the PI controller, getting a custom tune for it, etc, when you can just get a HPFP. Plus, with everything needed for PI, you would probably be approaching the cost of a HPFP anyways.

[johnung]

Originally Posted by randyf32

Thank you all for your help, I will be getting the PS2 with just the DV+ for now and upgrade HPFP if the need arises.

Install the Turbosmart. The Plumb Back model is the quieter one which I have. I really like the way it holds boost in Sport Mode so the power is always available when you step on it.

https://www.kiesmotorsports.com/prod...ack-vr9?aff=22

The Dual Port model is partially vented to atmosphere so you get a nice whoosh sound.

https://www.kiesmotorsports.com/prod...ort-vr9?aff=22

Below is an excellent installation video from Kies Motorsports where I had mine installed.

I have the same engine and also want to stick with 93 Octane. I spoke to Pure Turbos about Pure Stage2 and fueling. Stock N55 HPD5 fuel pump won't max out until about 420whp. An N55 Pure Turbos Stage2 on 93 octane will max out at about 480whp. So if you install a N55 PS2, you would need to upgrade the N55 HPFP to get from 420whp to 480whp.

You do not need to upgrade the HPFP at the same time as the PS2 upgrade. There isn't really a labor overlap. Right now the off the shelf HPFP solution in this space is the $1,200 Dorch1 pump which is expensive overkill.

FYI- Engine tunes like BootMod3 have a selection choice within the tune to use the Dorch1 pump. You can't just install the pump. Without a software change, the car won't start.

I'd hold off in your situation on a HPFP upgrade right away. I'm looking into less expensive HPFP options to run up to 500whp with the Pure Turbos Stage2 turbo upgrade without breaking the bank.