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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > New Motor different HPFP



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      08-21-2022, 12:53 PM   #1
PearlyN55
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New Motor different HPFP

Hey guys, I had the opportunity to buy a G1000 from Ghassan Automotives for a really good price and I plan on dropping that motor in my 335, only issue is that I have a late N55e with a f30 style pump, now I had previously upgraded with a stage 2 hpfp from Dorch engineering currently on it, and the vacuum pump mounting style is different from the early n55s and Iím having a tough time seeing if I can remove the early n55 pump and bolt up my newer style one, unfortunately all I am seeing is people talking about using the older style for the newer n55e because theyíre a better flow rate, what are the chances that the flow rate is better than a stage 2 pump from Dorch? If it isnít better than I would like to see if I can fit it with the newer style to accommodate the stage 2 pump, I hope Iím making sense
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      08-21-2022, 01:58 PM   #2
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The old stock style defintaley beats the new stock style, but I'd take a new style dorch stage 2 over the old stock style. I think the only way the old stock style would beat a dorch stage 2 if if you put a PFS POD overdrive on it.
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      08-21-2022, 01:59 PM   #3
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Plus I believe new style is a more reliable type of pump.
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      08-21-2022, 03:16 PM   #4
PearlyN55
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Quote:
Originally Posted by wheela View Post
Plus I believe new style is a more reliable type of pump.
Do you know if it can physically fit my new vacuum pump to allow me to continue using my stg2 hpfp? I did read thereís some DME programming and voltage difference between the 2 pumps my car is currently intended for the new style but I need to figure out if I can just unbolt the vacuum pump and pop on my newer style
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      08-22-2022, 08:13 PM   #5
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Quote:
Originally Posted by PearlyN55 View Post
Do you know if it can physically fit my new vacuum pump to allow me to continue using my stg2 hpfp? I did read thereís some DME programming and voltage difference between the 2 pumps my car is currently intended for the new style but I need to figure out if I can just unbolt the vacuum pump and pop on my newer style
Sorry, I brain farted and for some reason didn't put 2 & 2 together that you'd be running the old DME with the replacement engine with the older style hpfp. I'm not sure if you can connect a new style pump to an old style dme and have it work. Also not sure about the physical compatibility with the vacuum pump housing.
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      08-22-2022, 08:17 PM   #6
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Quote:
Originally Posted by PearlyN55 View Post
Do you know if it can physically fit my new vacuum pump to allow me to continue using my stg2 hpfp? I did read thereís some DME programming and voltage difference between the 2 pumps my car is currently intended for the new style but I need to figure out if I can just unbolt the vacuum pump and pop on my newer style
Sorry, I brain farted and for some reason didn't put 2 and 2 together that you'd be running the old DME with the replacement engine. I'm not sure if you can connect a new style pump to an old style dme and have it work. Also not sure about the physical compatibility with the vacuum pump housing. Sorry, I guess I'm not much help with this one. Hopefully somebody more knowledgeable will chime in.
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      08-22-2022, 09:32 PM   #7
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Do I understand it correctly that you had an n55 with f chassis style hpfp but now you got an early n55 with the same hpfp as an n54? From what I saw on some other forum, early n55 with the n54 hpfp has a different vacuum pump/hpfp chain tensioner compared to the later style n55 with f chassis style hpfp. That tensioner is not sufficient for driving later style hpfp and the chain tends to stretch really quick and come off. Iíve also heard that the newer style tensioner canít be mounted to the early style block.
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      08-22-2022, 09:41 PM   #8
PearlyN55
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Originally Posted by fastboatster View Post
Do I understand it correctly that you had an n55 with f chassis style hpfp but now you got an early n55 with the same hpfp as an n54? From what I saw on some other forum, early n55 with the n54 hpfp has a different vacuum pump/hpfp chain tensioner compared to the later style n55 with f chassis style hpfp. That tensioner is not sufficient for driving later style hpfp and the chain tends to stretch really quick and come off. Iíve also heard that the newer style tensioner canít be mounted to the early style block.
saw the same only issue is that if i simply change the front face of pump attaching to the hpfp then theoretically it should work just wanted to see if anyone knows or has heard if possible
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      08-22-2022, 11:30 PM   #9
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Quote:
Originally Posted by PearlyN55 View Post
saw the same only issue is that if i simply change the front face of pump attaching to the hpfp then theoretically it should work just wanted to see if anyone knows or has heard if possible
Not saying it wonít bolt up, just read that somebody did this and the vacuum pump chain kept coming off due to insufficient tension and quick stretching.
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