What is needed to run with VEMS?

[A80Avant]

i thinks there is a photo of the extra piggybacked resistor that needs removing and then you need to update the firmware with the new IAT info for the NTC sensor

[Jamo]

I hadn't seen about the 2 c upgrade on the later firmwares that is very interesting, a80avant has got it in one in the above post.

I want to see if my IAT's become more reactive, in my logs the IAT's are very flat across the range and dont go up and down in temp that often.

[GazzaG60]

sounds like you are on to something.

maybe try insulating around the exisitng sensor to see if its soak. id expect like you say it goes up and down. my theory is so long as it dont go too high. although i can understand you wanting better feedback as it may be going hi9gher but not reacting.

look forward to feedback on the change.

[th.b.w.]

Hi,

i using an GM sensor, i have stripped, and build an new housing.

I calibrate this with the 17point curve and it worked very well.

It react fast.

The oem one was between 5 and 15°C out of the way in my setup...

Thomas

[A80Avant]

the reason i want to change mine (OEM) is because when it jumps from 13 to 18 then to 23deg and 28 etc as it climbs, there is less room to see what more/less fuel is required depending on IAT etc. Mine, as soon as it reaches above 18deg, the lamda is almost needing to add fuel on cruise levels on all bins. If i make the VE table richer, then on colder IATs it goes the other way around. With the ability on the newer versions to add/substract fuel depending on IAT, that will solve the problem and even allow me to gain a bit more extra miles to the gallon perhaps. Now i use the warm up enrichment table to give more fuel when the CLT rises(usually goes together with IATs anyway) since on this firmware i dont have that MAT/IAT/TPS table.

[dkw_dude]

I used the standard S2 IAT, I used a Fluke temperature measuring thingy with the sensor element in ~ the same position as the IAT, fired it up from cold and compared Fluke/VEMS readings. I let it sit idle a long while, the readings were almost identical (+- 1°C) all the way up to 60°C. Thats ok for me. Heatsoak is not a problem when car is moving IMHO.

[A80Avant]

as i mentioned above, if you are using OEM inlet, you dont really have any heatsoak. if the inlet manifold walls are thinner, then the problem is more persistant.

besides, you are in Norway, so yes you dont have heatsoak once moving. Try living in Greece for a while with the S2 and see what IATs you'll get once stopped at a traffic light...haha

[dkw_dude]

as i mentioned above, if you are using OEM inlet, you dont really have any heatsoak. if the inlet manifold walls are thinner, then the problem is more persistant.

besides, you are in Norway, so yes you dont have heatsoak once moving. Try living in Greece for a while with the S2 and see what IATs you'll get once stopped at a traffic light...haha

I guess your're right, it's a more turbo friendly climate up here hehe.. My mate who is from Greece/Cyprus laughs at me when I complain about 30°C heat in the summer here in Norway .

(Slightly) back to topic, since this thread started I have installed and are running PnP VEMS on my S2, it works quite good I think!

[Jamo]

Who supplied your VEMS and what firmware you running?

[dkw_dude]

Pnanassy, running 1.1.70.

[Jamo]

Pnanassy, running 1.1.70.

[dkw_dude]

Very good support from Pnanassy and VEMS firmware/Vemstune seems to be working good so it does

Tested config (maps) switch, with a bit of fiddling it works very nice, going from to with a flick of the switch! And does it on the fly too, no need to "reboot"

[Jamo]

Great isn't it , what are you changing on map change just boost?

[dkw_dude]

At first it was only boost, but lately I have adjusted the ignition map a little on the "high boost" config, so there's quite a difference when the switch is pushed. The "low boost" config will stay unchanged for now.

Later I will install my bigger injectors and use the switch to alter between 99 octane/E85 fuel That's the plan anyway..

Do you use the config switch?

[Jamo]

Yeah when I got my ecu back it was there by default on my version, I was originaly using it for boost switch but I will run dual maps next year, either for balls out power or 95 ron fuel