BMW 325TDS Project Smoke Machine

[Duck Drift]

Is your flutter when giving her a high rev in first or no load cause mine
Dose the same when I put the boost over 1.5 bar or slightly less
Think it's some kind of boost cut and she fires a heap of fuel in, takes a few seconds to clear runs like shite and loads a smoke

[TorqueWorks]

both no load and load... but only when its cold.. once the car gets up to temp its grand never happens

but yes it does do exactly that spluttering & choking & bellowing smoke, but sometimes it can go 5 minutes before it clears.. turning off the car for about 30 seconds normally cures it

I dont think so much its a boost cut as the pressure sensor is fucked and not connected half the time.. nearly certain its not an ECU thing it feels more like its purely mechanical

[Duck Drift]

Sounds like what's mine dose it might last longer but I do
Kinda rev it out, may be due to the raised fuel pressure of the map I have
And the ecu with a slight software flaw, I've had a few 325tds and they all
Did it slightly but remapping seems to exaggerate it

[TorqueWorks]

Sounds like what's mine dose it might last longer but I do
Kinda rev it out, may be due to the raised fuel pressure of the map I have
And the ecu with a slight software flaw, I've had a few 325tds and they all
Did it slightly but remapping seems to exaggerate it

Ah this is only becoming noticable after the last drift day.. its when its between 5000 and 6000 revs that mine starts giving bother now where it usent before.. when its a bit hotter then it doesnt happen.I think the diesel then is more viscous and goes up around the needle in the injector more freely and the needle is able to spring back easier then

[mantahead]

mechanical pump required

there is a guy somewhere that fitted a mercedes m pump to 325tds

[TorqueWorks]

mechanical pump required

there is a guy somewhere that fitted a mercedes m pump to 325tds

not nececarily, it would be handy alright and lovely to have an inline pump...

there is an easier choice of mechanical pump from a 524td... but none the less the only thing different between the mechanical and electrical is how the governor is opened.. the actual working mechanics of the thing are the same and completely interchangable..

will be going for 12mm plunger & that can be got from any sort of tractor or truck with a bosch rotary pump.. and a higher lift cam plate from an Iveco cos they have one of the highest lift.. more push more diesel that all requires a MLS headgasket and a turbo aswell.. a while off that stage yet the bank account is looking shook still in college

A bit more fancy control of the chip wouldnt go astray, maybe linearly changing with the accelerator position would be very nice might concider working on that after exams in january if I sort out this top end spluttering... oh and an electronic timing advance aswell

[mantahead]

hi,
i built both electronic and mechanical pumps for the merc and was tortured a bit with limp modes and rpm issues on the electronic pump.
then i got Dieselmeken in Sweden to set the mechanical pump up, problem sorted.
although it would be nice to have the money to go standalone ecu with electronic pump and have a nice quick rev limiter.

[TorqueWorks]

hi,
i built both electronic and mechanical pumps for the merc and was tortured a bit with limp modes and rpm issues on the electronic pump.
then i got Dieselmeken in Sweden to set the mechanical pump up, problem sorted.
although it would be nice to have the money to go standalone ecu with electronic pump and have a nice quick rev limiter.

no limp mode issues for me strangely.. RPM issues I think are purely mechanical problems with this too.. Long term plan is to go & make an ecu with an arduino or something like that, I've another engine there to be doing a bit of R&D with :P


anyways, took the injectors out yesterday.. had to make a socket to go down over them.. crude but it worked



injector itself


then stuck them all on this old toy.. Genuine Bosch injector tester from back in the day






what I discovered, the injector in Cyl 1 was slightly different to the others, not leaking as such.. but the spray pattern was more focused, and the opening pressure was odd it partially opened & squirted a tiny jet unlike the other 5 which chuffed mist when touching off the opening pressure

change that now & pull out the injector from another car instead. see what happens at 6000rpm with that changed, could make all the difference.. If not, start looking at my pre pump

[LarZ]

Arduino ECU... EPIC...

[TorqueWorks]

started looking into water/meth injection heavily a few weeks ago & I've decided its worth a shot..

anybody know about it?



Take a read of this:
http://www.dieselpowermag.com/tech/1...h_is_too_much/






Why Im so interested in it is huge Horsepower & Torque gains without raising the compression ratio that much, and it lowers EGT's.... which is something I've been a little concerned about with this engine as they Reeeeeeeeeealy dont like getting too hot, hence the shorter exhaust.. and it basically steam cleans the engine...which is quite carboned up by the looks of taking out the injectors


***If you have no interest in water/meth injection, microcontrollers & how to DIY it stop reading now****


the water basically absorbs some of the heat of combustion which is only a short duration in the power stroke.. then the water turns to steam for the rest of the power stroke.. steam expands quite a lot & thats how steam engines work..

The cheaper kits are using a simple boost pressure relay that turns on the pump when the pressure reaches the set pressure. the kit starts injection at 100%

the more advanced ones are using a pressure sensor and controlling the pump to inject between about 60% and 100% as the pressure rises or rpm rises, depending on the kit.. this maximises the power gains from the water/meth injection

the prices of these kits are feckin mad altogether even for the basic pressure relay

Since the control can be so basic I've decided to develop my own, as theres other advantages to making my own controller. One of the main reasons I want to do this is the diesel pump has a 5 degree timing advance solenoid

one of the side effects of water/meth injection is a slight lag in combustion, something the timing advance solenoid can counteract be like Vaaaaaaaaaatec kicking in, except actually developing POWER not noise like hondas seem to do.

so... what do I need:

a Water/meth pump, something like this, the pressure can be adjusted down if needs be.. possibly the biggest expense of the whole job at around 100 quid
http://www.alcohol-injection.com/en/...tion-pump.html


injector nozzles, 10E each
this sort from McMaster-Carr, not exactly sure which to go for so probably end up getting both & starting small, working up. both full cone 80 degree spray patterns.. model numbers 3178k46 and 3178k47
http://www.mcmaster.com/#catalog/119/2074/=pw7b5g



boost pressure sensor, I got one for 0 to 2.5 Bar with a 0 to 5V output as its sensetive enough for what I need and it future proofs it for when we get a larger turbo
the one I chose was an MPX4250AP sensor



optional extra: a 300psi solenoid valve to place right beside the injection nossle so it doesnt injest water when it doesnt need to
something like this, altho more of a concern for petrol cars not exactly nececary on the diesel.. Il see!
they come in 12v too, about 40 quid
http://www.newark.com/gems-sensors/a...lve/dp/45M6099



then a H bridge motor controller to be able to control the voltage to the pump from about 6ish volts to full voltage of the car, 14.4V and able to handle 10A + current draw to the pump. This is the way of controlling the quantity of water injected using PWM from a microcontroller as the boost pressure & RPM's rise
one I have can handle 30A




and... the microcontroller I've started playing with, an Arduino UNO R3.
all I've being doing so far is pricking with the PWM outputs changing an LED intensity, just messing really


I also picked up a 4 line LCD display just to make the job look fancy


and something for another thing Ive wanted to do for a while, be able to see whats happeningwith the car from the side of the track on the laptop. plan to send stuff like engine RPM, boost pressure, throttle position, diesel tank level and water/meth injection quantity.
I have these transmitters capable of broadcasting 1km
http://www.dfrobot.com/index.php?rou...7#.UrTQd4XvjKo


theres also one other thing I can do with the microcontroller, I can make the chip I have a lot more intelligent and progressive the more the accelerator pedal is pressed