[VGSON]

Starting a new thread that's relevant to this turbo specifically on the n55 platform.

Mine is installed and did some tuning last night. Ran 15lbs on 93 and about 19lbs on e40 so far. This is first initial tuning session trying to be very safe and ease our way into it as we haven't had it on the dyno. Just running around mexico. Appears to be holding lbs past 6500rpm.
Initial plan is flex fuel tune. So we have a safe 93 on 15/16lbs and more aggressive e40. This will evolve into a flex fuel tune as I have the hardware.

Observations so far coming from stage 2 on stock turbo.
There is good amount of power down low, enough to roast 1st and 2nd gear from a stop. Dumping the throttle in 2nd gear from say 25mph is not as violent as before, but still fucking moves. We are also keeping boost low as this turbo is new and I dont want to buy a block yet.

LPFP could not handle E55. We dropped it back down to E45 and the fuel pressure was good. Running a stage 2 dorche only.

We are tracing the possibility of a boost leak since we hit 90% duty cycle at 19lbs and pure showed this turbo hitting 25lbs on their site. Sent an email to Pure asking about this issue and going back into the shop so they can investigate the leak.

I will say this turbo did do what I expected it to. Remove the heavy torque down low and make this motor feel more like a the s65. The way this thing feels at 19lbs, I am excited to see what more tuning time and 24lbs feels like.

Loading logs into Datazap and will post some when I get them sorted out. There's quite a few to sort thru.

[Me2]

Very Nice! Looking forward to more updates and the dyno results.
Are you on stock LPFP and Dorch stage 2 HPFP?

Originally Posted by VGSON

Starting a new thread that's relevant to this turbo specifically on the n55 platform.

Mine is installed and did some tuning last night. Ran 15lbs on 93 and about 19lbs on e40 so far. This is first initial tuning session trying to be very safe and ease our way into it as we haven't had it on the dyno. Just running around mexico. Appears to be holding lbs past 6500rpm.
Initial plan is flex fuel tune. So we have a safe 93 on 15/16lbs and more aggressive e40. This will evolve into a flex fuel tune as I have the hardware.

Observations so far coming from stage 2 on stock turbo.
There is good amount of power down low, enough to roast 1st and 2nd gear from a stop. Dumping the throttle in 2nd gear from say 25mph is not as violent as before, but still fucking moves. We are also keeping boost low as this turbo is new and I dont want to buy a block yet.

LPFP could not handle E55. We dropped it back down to E45 and the fuel pressure was good. Running a stage 2 dorche only.

We are tracing the possibility of a boost leak since we hit 90% duty cycle at 19lbs and pure showed this turbo hitting 25lbs on their site. Sent an email to Pure asking about this issue and going back into the shop so they can investigate the leak.

I will say this turbo did do what I expected it to. Remove the heavy torque down low and make this motor feel more like a the s65. The way this thing feels at 19lbs, I am excited to see what more tuning time and 24lbs feels like.

Loading logs into Datazap and will post some when I get them sorted out. There's quite a few to sort thru.

[VGSON]

Originally Posted by Me2

Very Nice! Looking forward to more updates and the dyno results.
Are you on stock LPFP and Dorch stage 2 HPFP?

yes, just the upgraded hpfp. still on stock lpfp.

Thank's im looking forward to getting the tune finalized. Planning to hit a dyno, but just to check curve and adjust parameters for torque. Not chasing number's really, but expecting 600 on E.

[mike@x-ph.com]

Sub'd

[eeyang92]

Interested to see what comes of this. I'm running Pure stg 2, but yeah my LPFP can't keep up after 6500rpm at 20psi when running E45 (running 19psi now until I upgrade the LPFP).

Curious what the power gains and spool characteristics are over stg 2 - I will say there is quite noticeable turbo lag which took some time to get used to. With the new highflow turbo/manifold, Pure claims a 400-500rpm decrease in spool time, which honestly sounds amazing if it makes more power while having less lag.

[ericlr1225]

Stock LPFP should handle E70-75ish also it is cheap. $130-$170. But to maximize the stage2 turbo, upgraded LPFPs are necessary.

[Mr_M//]

Sub'd

[VGSON]

Originally Posted by eeyang92

Interested to see what comes of this. I'm running Pure stg 2, but yeah my LPFP can't keep up after 6500rpm at 20psi when running E45 (running 19psi now until I upgrade the LPFP).

Curious what the power gains and spool characteristics are over stg 2 - I will say there is quite noticeable turbo lag which took some time to get used to. With the new highflow turbo/manifold, Pure claims a 400-500rpm decrease in spool time, which honestly sounds amazing if it makes more power while having less lag.

I hope this is true since its the reason I went with the pure750. Quicker spool and better exhaust flow than ps2. According to Pure, the turbine and compressor are the same as the pure800 on the b58. Tuner thinks there's a boost leak due to duty cycle, so digging into that tomorrow. Then back to tuning and getting to a dyno to finalize. The current tune is very conservative but still pulls hard. Can't wait to see what happens past 20psi and leaning into it a lil earlier.

[VGSON]

Originally Posted by ericlr1225

Stock LPFP should handle E70-75ish also it is cheap. $130-$170. But to maximize the stage2 turbo, upgraded LPFPs are necessary.

Mine couldn't keep up past 6k and 19lbs with e55. We dropped a few gallons of 93 to bring to e45 and it was fine. Likely the reason some are running e30...

Which lpfp are people running? I understand the EKP modules aren't easy to come by and there might be one that doesn't need it..

[F87source]

Sub'd as well!

[TheSandman_M2]

Originally Posted by VGSON

Mine couldn't keep up past 6k and 19lbs with e55. We dropped a few gallons of 93 to bring to e45 and it was fine. Likely the reason some are running e30...

Which lpfp are people running? I understand the EKP modules aren't easy to come by and there might be one that doesn't need it..

I run a Spool Stg 3 lpfp. Second pump comes on at 10 PSI, hobbs switch.

[ericlr1225]

Originally Posted by VGSON

Mine couldn't keep up past 6k and 19lbs with e55. We dropped a few gallons of 93 to bring to e45 and it was fine. Likely the reason some are running e30...

Which lpfp are people running? I understand the EKP modules aren't easy to come by and there might be one that doesn't need it..

I think it depends on your goal and how much you wanna squeeze from your PS750. I didn't upgrade my turbo, so I'll leave to others who got experiences.

As for the EKPM, I had a small talk with precision racework guys, hope it would help you to decide. From what I understand, just throw a plug and play stage2 or stage2.5 pump in, call it a day and get prepared for ekpm issue in the future. Every car is different.

sub'd and looking forward to see your result in the future. good luck

[AmuroRay]

They have a EKPM you can buy to replace the factory one, you have to look it up on the F30 side.

[VGSON]

Originally Posted by ericlr1225

I think it depends on your goal and how much you wanna squeeze from your PS750. I didn't upgrade my turbo, so I'll leave to others who got experiences.

As for the EKPM, I had a small talk with precision racework guys, hope it would help you to decide. From what I understand, just throw a plug and play stage2 or stage2.5 pump in, call it a day and get prepared for ekpm issue in the future. Every car is different.

sub'd and looking forward to see your result in the future. good luck

My goal; happy turbo and motor making around 600 wheel..Hopefully stock lpfp.. The ps2’s we’re getting mid 5’s on similar setups..Im shooting for low backpressure and a smooth torque curve…Beating up on e85 5.0’s and FBO b58’s is also there.

[F87source]

Originally Posted by VGSON

My goal; happy turbo and motor making around 600 wheel..Hopefully stock lpfp.. The ps2’s we’re getting mid 5’s on similar setups..Im shooting for low backpressure and a smooth torque curve…Beating up on e85 5.0’s and FBO b58’s is also there.

I don't think the stock lpfp has brought flow for those power targets, especially if you plan on running ethanol mixes.

[VGSON]

already running e45…seen data showing 600 on E30 with wmi injection…But we’ll see. Planning a clutch and lpfp as next if needed

[F87source]

Originally Posted by VGSON

already running e45…seen data showing 600 on E30 with wmi injection…But we’ll see. Planning a clutch and lpfp as next if needed

Is the wmi supplementing fuel or just octane?

Because if it's octane, then no problem. If it's fuel then that's pretty sketchy and I would rather get a more capable fuelling setup.

[VGSON]

Originally Posted by F87source

Is the wmi supplementing fuel or just octane?

Because if it's octane, then no problem. If it's fuel then that's pretty sketchy and I would rather get a more capable fuelling setup.

No idea of their injection setup, Jimmy didn’t share that info and was relaying what he had from Pete at pure Uk.

Like i said, we’ll be testing the limits of what i have currently then upgrading as necessary. I will be running direct injection only with flex fuel tune. So Lpfp might be needed. might need injectors too. We’ll see

found two boost leaks today. One at tmap (bad oring on new sensor) and ER charge pipe is leaking very slightly at intercooler side under at high pressures…Seems like if you’re going to run high boost..Switch to silicon with tbolts vs factory connections, or be prepared to…

[AmuroRay]

https://f30.bimmerpost.com/forums/sh....php?t=1953773

[F87source]

Originally Posted by AmuroRay

https://f30.bimmerpost.com/forums/sh....php?t=1953773

But the stock wiring isn't meant to support that much current, neither are the connectors. There was a similar analysis done on Facebook, and I still think the ekp option from EOS (and made by torqbyte) is way better.

[AmuroRay]

Originally Posted by F87source

But the stock wiring isn't meant to support that much current, neither are the connectors. There was a similar analysis done on Facebook, and I still think the ekp option from EOS (and made by torqbyte) is way better.

As far as I know, torquebyte doesn’t make theirs anymore. The stock anything on this car isn’t made to handle anything out of its parameters, but we all do it
Do you have any evidence that this solution is inadequate?

[F87source]

Originally Posted by AmuroRay

As far as I know, torquebyte doesn’t make theirs anymore. The stock anything on this car isn’t made to handle anything out of its parameters, but we all do it
Do you have any evidence that this solution is inadequate?

Interesting I didn't know torqbyte stopped offering.

In regards to the upgrade you linked, the internals should be fine. However the cars wiring harness is suspected to be the limiting factor. Ill look for the facebook group discussion, but because we can definitively know what gauge a wire needs to be to carry a certain amount of current safely, we can determine if the factory wiring would be sufficiently thick enough to carry the extra load. The analysis on Facebook showed it wasn't thick enough to carry all the extra load the new module would allow.

This is much different than pushing an engine harder for instance, because you know that if you tune an engine carefully and avoid knock and lugging on it. Then you can effectively avoid events that would cause an engine to fail. With wiring that's not possible, the current will flow through it and the wire will hold it or it won't.


Also the stock drive train components have massive amounts of head room on it vs. the wiring, because there's incentive to make engine parts stronger so it can be used on more platforms. For instance the m2 shares the s55 rods, piston rings etc. Whereas the with wiring, there's not a massive incentive to make the wires super thick, because stock fuel flow even for highly tuned factory variants will never pull as much power as the crazy after market options we are looking at.