Vems Map + Injector Sizing

[Jamo]

Has anyone got any VEMS maps I can load into megatune to nose at

stating turbo and injector size?

[Jamo]

Found some but post them up anyway, a lot of VEMS users around now days it seems

[A80Avant]

what maps do you need?
do you want the msq?
or just jpegs of map tables?

also injector size is irrelevant.it is just a number.you can change that around easily.

give me your email and ill send you what you want

[GazzaG60]

thats correct. ve should stay the same and req_fuel will change.

best to look at megamanual.com jamo. thats the tuning bible for megatune with useful calculators.

[Jamo]

I found http://www.efiexpress.com/catalog/ar...?articles_id=1

Damn fine webpage so yes injectors is just a calculation very good came up with a theoretical

750 cc injectors rated at 3 bar running at 4 bar = 866.03 cc / min
Therefore Stroker req+fuel = 6.49 * ( 2521.69 / 5 / 866.03 ) = 3.78 * .75 = 2.84

I'm having a play and seeing what I can learn before deciding what to do with the ecu, does seem though there is a lot to learn

[GazzaG60]

if you read the getting started section of megamanual then its how to get vems going. same settings just less than megasquirt.

good stuff from marc. he's done good things with it. shame he wasn't running it when i did mine. i had to learn the hard way oh and help from a top man teppo kalske.

vems is one of the easiest if not the easiest system to tune. you will have a good running car in less than 2 hours i expect. 20 more hours may get perfection.

between marc and megamanual im sure you will get it sorted.

[A80Avant]

yup, indeed

megamanual is indeed the pages to read. lots of info,and i still go back to them for a refresh!

[Jonas_R]

I found http://www.efiexpress.com/catalog/ar...?articles_id=1

Damn fine webpage so yes injectors is just a calculation very good came up with a theoretical

The map on Marc's page, I assume that is basemap for the I5 engine?

[A80Avant]

yes, it is a base map so that you can turn the ignition on and start the car.

first thing to do is to tune the VE table

[Jonas_R]

yes, it is a base map so that you can turn the ignition on and start the car.

first thing to do is to tune the VE table

Excellent

So I pressume I need to set reqfuel first and then I can do the VE table?

[Jamo]

Excellent

So I pressume I need to set reqfuel first and then I can do the VE table?

If you bought it from marc you shouldn't have too, he supplies it with a basemap if you supplied him with your car spec.

I haven't bought VEMS but trying to get a feel for it

[Jonas_R]

Bought it of Vems.hu since I could get it without VAT (15%) since I'm using it on my company car.

Importing stuff to Denmark from the US is very expensive. Take Marc's price and add around 33% to the retail price with shipping.

Would rather have bought it off him

[GazzaG60]

sorry jonus. ill try to send it to you soon. ive been really busy last few weeks.

basically you can generate a ve and spark table.

you then have to set the req_fuel. this is how long the injector needs to be open to attain stoich. there are calculators for this.

next is the cold and hot pw. for crank. the actual ms of fuel is scaled between these values. within 0.5ms and you will be on your way. small tweaks then as you go.

then its tweak all 3 tables to match the requirement.

from a base map i made 4 changes and it started. mine was teppo's or marcels map.

[Jamo]

My brain is melting from megamanual, good stuff though!

[Bram]

I bought VEMS from Marc and I received it 2 days ago. It took about 2-2.5 weeks lead time. I paid 86 euro import duty's (as Marc rates it at 400 USD on my request) and got a free WB lambda sensor with it, so I think that is not too bad of a price (1460 USD ~ 1014 euro incl. shipping from US to NL + 86 euro import tax). So in total it cost me 1100 euro incl a free WB lambda sensor.

Marc already took into account all of my new engine data and I should be able to drive it as soon as my engine is ready, to turn the ignition key.
Great service so far!