[yupetc]

Originally Posted by thejeremyman9

Does the evo fit without any modifications but the TU requires modifications?

Both evo and TU will need the same modifications to get the base plate to fit onto our N55 vacuum pump holes. You'll need to dremel out the correct hole locations. I'm still a little vague about the harness, but it will ultimately be pretty easy considering the worst we'll do is to cut the harness' plug and rewire it somehow because there are a bunch of B58 hpfp harness extenders you can buy for cheap; no big deal.

[thejeremyman9]

Originally Posted by yupetc

Both evo and TU will need the same modifications to get the base plate to fit onto our N55 vacuum pump holes. You'll need to dremel out the correct hole locations. I'm still a little vague about the harness, but it will ultimately be pretty easy considering the worst we'll do is to cut the harness' plug and rewire it somehow because there are a bunch of B58 hpfp harness extenders you can buy for cheap; no big deal.

So what about the TU makes it potentially damaging but the evo is not?

[yupetc]

Originally Posted by thejeremyman9

So what about the TU makes it potentially damaging but the evo is not?

I don't want to speculate without being sure, so don't take my word for it. If I may, I do remember seeing a thread where someone made measurements to both pumps and posted their findings. Don't remember the details, but the seal ring landing on the TU is slightly different than the evo; but not so to have mattered swapping between the different B58 engines; however, does raise cautionary concern onto our N55's. Then for TU pump to have that much more flow volume than evo, something has to be within the assembly to set that difference. This is where my knowledge ends, I'm willing to listen for more discovery and science.

[AmuroRay]

Aren’t they cam driven on the B58 and mechanically driven on the N55?

[yupetc]

Originally Posted by AmuroRay

Aren’t they cam driven on the B58 and mechanically driven on the N55?

N55 is mechanically driven, but does work off a cam-like setup. So technically they are both cam driven. The N55's vacuum pump's hind section has a cam lobe that turns, and it's driven by the vacuum pump pulley which is in the same chain loop with crankshaft and oil sump pump. So if you ever take the HPFP out on a N55 and look into the hole, you'll see a cam lobe, this is independent from the intake and exhaust cams which are driven by the timing chain loop. But on the pump itself, the N55 and B58 HPFP are both sprung pumps, lots of semblances to be found, although I've not seen the internal mechanism; so I couldn't comment on those.

[arekuf3x]

Originally Posted by yupetc

I don't want to speculate without being sure, so don't take my word for it. If I may, I do remember seeing a thread where someone made measurements to both pumps and posted their findings. Don't remember the details, but the seal ring landing on the TU is slightly different than the evo; but not so to have mattered swapping between the different B58 engines; however, does raise cautionary concern onto our N55's. Then for TU pump to have that much more flow volume than evo, something has to be within the assembly to set that difference. This is where my knowledge ends, I'm willing to listen for more discovery and science.

The plunger is 9mm on b58 evo same as n55 hpfp and 10mm on b58tu pump. How does it cause damage, I don’t know so I’m sticking with b58 gen 1 pump for now. I’m running pure500 turbo, I finally was able to crash b58 pump on e30 tune around 21.5-22psi, I think I have to stick with 19-20psi max. I’m still happy with this setup, too bad for smog, I would just get dorch stage 2.

[thejeremyman9]

Originally Posted by arekuf3x

The plunger is 9mm on b58 evo same as n55 hpfp and 10mm on b58tu pump. How does it cause damage, I don’t know so I’m sticking with b58 gen 1 pump for now. I’m running pure500 turbo, I finally was able to crash b58 pump on e30 tune around 21.5-22psi, I think I have to stick with 19-20psi max. I’m still happy with this setup, too bad for smog, I would just get dorch stage 2.

Do you have MHD OTS maps? I would be very interested to see if you could run the MHD stage 2+ OTS E40 HPFP map with the evo pump with a pure500. If you can, then i could definitely run it on stock turbo.

[arekuf3x]

Originally Posted by thejeremyman9

Do you have MHD OTS maps? I would be very interested to see if you could run the MHD stage 2+ OTS E40 HPFP map with the evo pump with a pure500. If you can, then i could definitely run it on stock turbo.

I only see stage 2+ e20 tune, do you mean stage 2 hpfp e40 tune?

[5w20]

Originally Posted by arekuf3x

The plunger is 9mm on b58 evo same as n55 hpfp and 10mm on b58tu pump. How does it cause damage, I don’t know so I’m sticking with b58 gen 1 pump for now. I’m running pure500 turbo, I finally was able to crash b58 pump on e30 tune around 21.5-22psi, I think I have to stick with 19-20psi max. I’m still happy with this setup, too bad for smog, I would just get dorch stage 2.

How much timing?

[thejeremyman9]

Originally Posted by arekuf3x

I only see stage 2+ e20 tune, do you mean stage 2 hpfp e40 tune?

Oh i guess so, maybe its under stage 2 maps not stage 2+, i havent been in the app for a while. That must be it. They said they released E40 and E85 HPFP maps IIRC.

[arekuf3x]

Originally Posted by 5w20

How much timing?

About 14 to 15.

[johnung]

Note: When discussing HPFP fuel pump flow rates, it’s important to understand that besides being higher capacity pumps, the two B58 fuel pumps also flow over 6% more on the B58 engine because the N55 & B58 engines have different size cam lobes that the pumps ride on inside the engine. Make sure that flow rates are all being measured on the same engine. See photos for data.

[arekuf3x]

Originally Posted by thejeremyman9

Oh i guess so, maybe its under stage 2 maps not stage 2+, i havent been in the app for a while. That must be it. They said they released E40 and E85 HPFP maps IIRC.

I wonder what boost target is on that, I’m not sure if b58 hpfp on my setup can handle e40, pure500 turbo is more demanding. My current tune is e30 mix, I’m seeing b58 evo hpfp crash above 21psi, oem n55 hpfp crashed at 17-18psi.

[AmuroRay]

Originally Posted by arekuf3x

Here you go, still finalizing the map, currently running more boos. Maps below are both on same revision. Any more boost and n55 hpfp would crash to 1200psi. I actually had few crashes on this map with n55 hpfp, usually around 1100-1200 psi.

N55 ewg, 8 auto, pure500 turbo FBO. Car is running higher boost now, it’s a beast.

N55 hpfp dip to 1400psi vs 2000psi on b58 hpfp.

B58 hpfp with same map

https://datazap.me/u/arekux/pure500-...og=0&data=3-12

N55 hpfp with same map

https://datazap.me/u/arekux/pure500-...og=0&data=3-13

F87source

[thejeremyman9]

Originally Posted by arekuf3x

I wonder what boost target is on that, I’m not sure if b58 hpfp on my setup can handle e40, pure500 turbo is more demanding. My current tune is e30 mix, I’m seeing b58 evo hpfp crash above 21psi, oem n55 hpfp crashed at 17-18psi.

I only saw one log on it in the MHD log IIRC. It was only like 1-2 psi more than the stage 2 map from what i remember. I think it would be lower boost than your custom tune but higher ethanol, so it would be an interesting comparison if you can test it, both from a datalog perspective and a "how it feels" perspective.

[yupetc]

Originally Posted by johnung

Note: When discussing HPFP fuel pump flow rates, it’s important to understand that besides being higher capacity pumps, the two B58 fuel pumps also flow over 6% more on the B58 engine because the N55 & B58 engines have different size cam lobes that the pumps ride on inside the engine. Make sure that flow rates are all being measured on the same engine. See photos for data.

That's an insightful note to make. Really appreciate the breakdown.

[boosted_f22g]

So the safer option would be with the gen 1 pump? I found a tu for a good price but if it "causes damage" it puts me on the fence

[thejeremyman9]

Originally Posted by boosted_f22g

So the safer option would be with the gen 1 pump? I found a tu for a good price but if it "causes damage" it puts me on the fence

There is a risk that the TU could cause damage in the long term, mostly due to the way it has to be installed without precise alignment. Tons of people run it without issue (at least from what we hear about on here) but going with a stage 1 that is specifically designed for N55 is safter.

[boosted_f22g]

Originally Posted by thejeremyman9

There is a risk that the TU could cause damage in the long term, mostly due to the way it has to be installed without precise alignment. Tons of people run it without issue (at least from what we hear about on here) but going with a stage 1 that is specifically designed for N55 is safter.

Yea of course just super ill priced lol.