Forum about forum

Forum about forum



SearchSearch   Users   Registration   Entrance
Today: 03.03.2026 - 16:57:40
Pages:  1  

HPT v's LPT

AuthorMessage

Sticky

Guru


Statistics:
Messages: 2,089
Registration: 03.27.2002

As title what are the best ones to go with, pros and cons please



Message # 1 25.08.25 - 07:33:39
RE: HPT v's LPT

ponq

Guru


Statistics:
Messages: 25
Registration: 11.25.2002

I have a b230fk, Which is the LPT, The LPT has not got an adjustable wastegate actuator, and after comparing to a scrap HPT this is correct, The LPT have Mitsubishi Turbos and a few HPTs have Mitsi turbos. I fitted a manual boost controller, and set it to 10psi. The LPT boosts at 4psi The HPT boosts at 8psi LPT stock is more economical than HPT. HPT has more turbo lag than LPT.


----------------------------
(On going to war over religion) "You're basically killing each other to see who's got the better imaginary friend." - Rich Jeni
Message # 2 25.08.25 - 07:43:51
RE: HPT v's LPT

gerry_miranda

Guru


Statistics:
Messages: 2,616
Registration: 02.27.2001

Thanks to the above posts. I understand turbo lag as had an old legacy, was teriible. Perhaps I should have been more specific as want to know mainly about the differences in reliability, service costs etc. I.E does a HPT turbo put alot more stress on the engine


----------------------------
97 M3/4 ...420rwhp...Dinan SC Tuned by AA, M50 Manifold, RMS Aftercooler 3.5 Porsche HFM, 42# injectors, Supersprint Exhaust AA Turbo Clutch, AA LTW Flywheel, TCK Suspension AA Strut bars (F&R), XBrace, BMP Rear Camber Correcting Arm BBS RK wheels on
Message # 3 25.08.25 - 07:50:50
RE: HPT v's LPT

TooTall424

Guru


Statistics:
Messages: 774
Registration: 04.18.2003

Higher pressure turbo is putting a higher pressure into the engine, so it may just be putting a bit more into the engine- however Big modders like the turbobrickers, can push 20psi IIRC? running it at 10psi is nothing given the redblock reputation.


----------------------------
braaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaap
Message # 4 25.08.25 - 07:59:20
RE: HPT v's LPT

Prodigal_M

Guru


Statistics:
Messages: 87
Registration: 04.16.2003

Thanks Raven, that advice was just what I was after. Problem is now the the car I was looking at was pulled from Ebay. Originally only wanted wheels to put on my limo, then noticed it had full leather and manual Anyone from here buy her??



Message # 5 25.08.25 - 08:04:20
RE: HPT v's LPT

wmarcel

Guru


Statistics:
Messages: 536
Registration: 09.01.2003

Hi Raven I have wondered the same question but thought the lpt had a higher compression ratio than the hpt. My reasoning is: petrol engines have a compression ration of abut 9:1. When manufactures turbo charge an engine they first reduce the compression ratio by putting different con-rods, head etc or a thicker head gasket. The air is then pumped into the cylinders by the turbo effectively bringing the compression ration back up to 9:1. So you are still compressing the air to 9:1 in the cylinder. I have always thought that the higher you turn the turbo up, the more you reduce the compression ratio which will give a final 9:1 at full boost and thought the hpt had a reduced compression ratio vs the lpt.



Message # 6 25.08.25 - 08:07:59
RE: HPT v's LPT
Beware newbie dumb ass questions : Previous topic
Pages:  1  

The administrator has prohibited guests from replying to messages! To register, follow the link: register


Participants

Running on: Vanilla Forums 1.13.0