BMW E30 M20 VEMS,turbo

[rob@vems.co.uk]

You need to try fresh each morning and possibly each night, start with a richer than needed mixture and lean it out.  Its tricky to try and explain.

[BenFenner]

Congrats on getting the car running well!

Dan sees the same 100% or more for injector duty cycle. It seems BMW didn't expect many trips to the redline in these cars. Either that or they have super awesome injectors. =]

Cold start has a few main factors as far as I can tell. One of them is the amount of idle valve opening at cold temps. If you don't have your idle control hooked up, you might have trouble with getting cold start to work correctly.
Also, make sure the rpm valve where it switches from cranking to "afterstart" is something like 200-400. I had mine at 500 for a while there, and that caused me all sorts of problems, as the car never got over 500 rpms while cranking, so it never switch to the "afterstart" mode, where it gives it a bunch of fuel to kick it up to idle speeds.

[gox]

Congrats on getting the car running well!

Dan sees the same 100% or more for injector duty cycle. It seems BMW didn't expect many trips to the redline in these cars. Either that or they have super awesome injectors. =]

Cold start has a few main factors as far as I can tell. One of them is the amount of idle valve opening at cold temps. If you don't have your idle control hooked up, you might have trouble with getting cold start to work correctly.
Also, make sure the rpm valve where it switches from cranking to "afterstart" is something like 200-400. I had mine at 500 for a while there, and that caused me all sorts of problems, as the car never got over 500 rpms while cranking, so it never switch to the "afterstart" mode, where it gives it a bunch of fuel to kick it up to idle speeds.

Thanx i found that that dan's lamda table is not good,so i talked to Mattias as he has tuned multiple BMW m20 engine,turbo and N/A and we made a new one,and belive me when u tune the car with that lamda target value,it runs much better...i have some more spots to tune,but it runs like it never did 2nd gear cant get traction until limiter or until i release throtle a bit.But than i saw in my logs that i have 101% duty cycle and i heard engine knocking at 3rd gear above 5000rpm,added some more fuel and knock stoped...but it needs more fuel and injectors cant give more so i found 6 injector from 325i 24v that are ~192cc that should be fine...i just want to tune the car go to dyno and then start my tubo build.

I have my cranking rpm set to 400...so that should be fine...i will try to set that stupid idle valve and see how it goes...do you have any values for stepper to begin with? I`m not so good at those PID things 

I realy like this standalone thing,and i think i made a best choice i could,vems is realy great and for that kind of money you cant actualy get anything....

Thank's to all of you guys who helped me

[BenFenner]

Great to hear things are running well. Since you seem to have a better lambda target table going on, do you mind sharing it with us? We'd love to take a look at it, as Dan's car doesn't seem to have the power you describe. =]

Edit: It just occurred to me that Dan never posted his new lambda target table. We realized his old one was pretty rich a while ago but never posted his new table. I'd still like to see what you came up with, but I think Dan's posting his new table up in his thread as we speak. He still doesn't have the power you describe (loss of traction towards the top of second), but maybe he keeps traction in second because of his great tires. =]

[gox]

Hehe Well i have good 205/50 R15 tires and 3.64 LSD,it realy runs much much better then he used to run on motronic.
I just take a look at his table,and i think you guys are very lean...esspecialy at higher load where engine needs fuel,thats why you dont have so much power....i noticed too that the engine is very quite now when it has fuel....

What EGT do you see with that lamda table that are you using? Stock one runs 780C,so you should try to stay in that area to be safe.

Here's my map try it:

[gox]

Here is my spark table,i will have dyno tuning this weekand (day said it will be free for weekands) so i will try to tune a spark for bit,i`ll post the results of dyno and everything.

On motronic i had 159whp@6200 and 225Nm od torque with 205/50 R15

[BenFenner]

I just take a look at his table,and i think you guys are very lean..

We know we are running much leaner than you. Dan's original lambda target table looks almost exactly like what you're using right now. When we tuned to it, he was slower than stock. Tuned to his new table, we've got him ever-so-slightly faster than stock with no sign of knock at all. I'd love to see a log of a 3rd gear pull in your car from 1.5k to 6.5k rpms. E-mail the log to me at fenfam@sc.rr.com if you would please. I'd love to take a look at it.

What EGT do you see with that lamda table that are you using?

We didn't get the EGT hooked up with the car N/A so we have no idea. =(

[rob@vems.co.uk]

Hmmm, theres a point - if you can both find flat long straights of road and datalog power runs through each gear then it could be interesting to compare the two against each other - the logs should be able to show the fuel and spark at each point on the curve and you might be able to work out by the gradient of the rpm trace which part of the map is most effective and at which point.

Does that make sense?

Rob

[gox]

Yep it does make sense,i need to tune my high rpms more,and its raining for two days here,so i dont like being at hight speeds at those wet and dirty roads,but as soon as i get a chance i will do a datalog of every speed so we can compare.I`m not an expert in tuning this is my first tuning expirience,have in mind that i have schrick cam,but you have beter intake manifold

[gox]

Too bad we never made those logs
I`m currently in building my engine (i have another m20 that i want to turbo)
As soon as my pressure plate arrives,i`ll continue my work and update the thread too!

[danmartin]

The 618 is a good PP. It creates a heavy clutch feel, but I preffer it more than factory. What kind of clutch are you going to run? Im running 6-puck unsprung and it engages like factory, but then again I'm used to the 6-pucks.

[gox]

i was planning to use 6 puck sinter too...
i think 618 with 6 puck can handle 700Nm?

[danmartin]

yeah i don't think it will be a problem.

[gox]

Uhhhh....didnt updated recently here is the current condition:



Last night i have started the engine,but i dont have oil in the cylinder head,i thing the oil pump is bad...i dont know any other things that can make this problem...

Will update again...

[gox]

Engine is working,not it needs mapping.

I will do some mapping tonight...and post news.