Hi there.

Newbie here and been wanting to ask a question which may have been covered before so apologise if it has..

I have recently managed to obtain a low mileage m104 engine with ecu, loom and transmission and plan to turbo it over the summer.

Mechanically i don't see any issues, as im not bad with mechanical work, however i wondered what limitations does the stock ecu have when it comes to mapping after been fitted with the turbo, will the car run on a stock ecu system?

My plan is to have the mechanical side done by myself then hand it over to a mapping specialist however i wondered at what point do i need to look at stand alone ecu's.

Would the car run up to a certain point before requiring stand alone management? My thoughts are if i can do the mechanical work and have the car running i can then hand it over to a specialist to complete the mapping and possible installation of a stand alone if needed past a certain bhp.

Thanks in advance guys

turbo bandit has most of what you need

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Thanks oldsinner111 im going to make the manifold, and buy parts separately its just the mapping and fuelling side which is my issue at the minute, thanks again

What kind of m104? One from a w124?

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,

Best way would be a MAF-to-MAP conversion on the stock ECU, doable with a piggyback

There is no point to play with piggipack or stock ecu, standalones are rather cheap and for few flashes are already in standalone budget. Ms2 or go full diy with speeduino.
For my understanding that old stock ecu isint that tuner friendly, u need obd2 type ecu to have easy reflashing possibilities.

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MB 300CE Turbo '88
MB 300E '86

All great info thanks Guys, iv not heard of them models before iv always looked into the EMU and a few other brands but il look into them, thanks again

Ecumaster, maxxecu, haltech, vems, ms, list goes on. Some more affordable, some less.
Eccumaster would be good choice.

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MB 300CE Turbo '88
MB 300E '86

Great thanks sm.pelle il have a look into them iv emailed some uk dealers to see if they have a package available see what they come back with, thanks again

My M104 is a 99 hfm. easist way for me would be add two injector before throttle body, let a a along ecu to fire them with rpm sensing. cheap way ,and use procharger instead.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Biggest problem isint fuel, if u cant retard ignition according to boost then eventually u have some major engine failure. Doesent matter if u use turbo or charger.
In super low boost it might work to some extent, but whats the point. M104 takes with ease 100hp per rod.
With standalone u have overboost protection, knock control.

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MB 300CE Turbo '88
MB 300E '86