E46 M52 TU Shortie Header

[smiddy 76]

Fitted and tested shortie header at Hi Velocity. Was hopeing for more gains but ecu retarding timing when hot. Need to Re-mapp. Around 7 RWHP gain [Auto]. Heaps more throttle response and around 1Ltr/100km fuel gain. Will post Dyno sheets when scanned.

[jordyboy2 0]

Im guessing youll be making them, if so How much are these likely to be

[smiddy 76]

Im guessing youll be making them, if so How much are these likely to be

Hi, Will be $475.00. Thanks.

[jordyboy2 0]

Sweet, will need to Make sure its the right engine when it comes back from the body-shop early next week, the badge says 325 but its a 2000 so I think its supposed to be 323 which would be the M52 engine right?

If its the correct engine ill defiantly be keeeeen

[smiddy 76]

Yes, you should have 2.5 eng. Just check you have mid mount cats.

[jordyboy2 0]

Yup i do, ill get back to you after my next payday

[smiddy 76]

Have sent PM.

[smiddy 76]

Dyno figures for my shorties. Part to mid throttle driving much improved. Jap exhaust restricting top end I think.

[smiddy 76]

Thanks Ron, I value your comments. Was hopeing for a little more as you do. The Jap E46 M52 cars have a very average post cat exhaust which I think is restricting top end . Hybrid had his exhaust modded and gained noticable top end power. I think re-mapp also. Who knows how imports are mapped?

[westy 614]

Thanks Ron, I value your comments. Was hopeing for a little more as you do. The Jap E46 M52 cars have a very average post cat exhaust which I think is restricting top end .

The 328s average looking single pipe arrangement? You would think there was room for improvement there.

The 330s ,like Josh/Hybrids, are a twin pipe system from the factory. Could be an option to look at?

[smiddy 76]

Josh's car has cat back fitted now, prior his car had same exhaust, twin from header back to cat, then merge in a crushed pipe arrangement into single out to tailpipe.

[westy 614]

Ahhh ya learn something new every day.

Our 330 has twin pipe. NZ new tho.

[smiddy 76]

Yes, and no post cat oxy sensors.

[smiddy 76]

I hear you Ron and you make a lot of sense. To even get these headers to fit was a mission[rear section]. US speed shops selling them claim 8-10 eng HP, so my power is about right. They are a sport header and are priced to reflect that. The real plus I see now after 3 weeks driving is fuel saving and mid throttle power is way better. Really nice part throttle power.

[lidistick 70]

Is it safe to assume this will give similar benefits on an E36 M52?

Running de-catted twin exhaust (stock).

If so, keen to buy a set to try and get extra HP

[smiddy 76]

System is 3/2/1 Ron. Header tube dia is 35mm, runner length average maybe around 35cm.

There is a marked differance in head mount plate port size compared to OEM [as per pics].

Edited May 17, 2009 by wayney

[briancol 3]

How is progress on the E36 ones Wayne?

[smiddy 76]

How is progress on the E36 ones Wayne?

Have some Brian, just need to trial.

[hybrid 1039]

Picking up the m54b30 ones for the 330i in the next few days cant wait.

[ieasti 0]

so anynews for the e46 330 engine?

[smiddy 76]

Hi Guys, Hybrid is to trial long headers on his 330.

Shortie as this topic relates are on my M52 TU and go well.

Shorts will fit M50/52/54 with mid mount cats.

[hybrid 1039]

As I said in the PM's Im getting about this. Im currently trying to sort out a few sensor related gremlins in my car before changing the exhaust system and introducing another varible.

I should have something sorted in the next 4 weeks going well. Sensors aren't the cheapest to replace in the e46

[moktar 7]

Have some Brian, just need to trial.

Im also very keen on a set. For E36. Please PM me with price and avalibitly.

Thanks