VemsTune and 1.1.6x release

[GintsK]

Lowering below 100% does not work. Higher than 304% not allowed.
According to my experience and this graph
at 0degC 4..6 times more fuel needed compared to fully warmed.
Graph shows even about 15 times richening at -20degC! I have -15C here!
Does 1.1.64 injects additional fuel at first cycles? Previous it was configurable.

[GintsK]

cranking=cranking enrichmnet*warump enrichment

at 0degC it is OK. (May be). 135%*300=405%

But when temperature goes lower...

145% is my WU at -15degC (engine idling fairly good, WBO2 reads 0.9...1.0). But then 1.45*300=435%  -  far too low!

[GintsK]

My WU graph usually looks very similar:
http://www.vems.hu/wiki/index.php?page=MembersPage%2FAndrey%2FCranking

[Sprocket]

cranking=cranking enrichmnet*warump enrichment

Are you sure about that? Please explain

Cranking * warmup would give massive pulse width

I was always led to believe that cranking is what gets the engine started, pure and simple pulse width value, once the engine has started it is warmup*VE + afterstart and then to just warmup*VE to just VE

Where cranking enrichment is cranking VE* cranking temperature scaling

[GintsK]

Seems MWfire is right. In accordance with Andrey.

Problem is not too big pulse, but too short if inject additional fuel at cranking is discarded.

In beginning cranking value was used for multiplicaion twice (square). Then 145% * 300%^2=13 - close to perfect!!
 

[Sprocket]

Something else to consider, is setting the injectors to fire all banks at cranking, that will add more fuel, reducing the cranking curve peak. I couldnt get enough pulse width on 1.0.73 with individual fire at cranking, but all banks at cranking made all the difference

[MWfire]

Seems MWfire is right. In accordance with Andrey.

Problem is not too big pulse, but too short if inject additional fuel at cranking is discarded.

In beginning cranking value was used for multiplicaion twice (square). Then 145% * 300%^2=13 - close to perfect!!
 

i think in 1.1.64 isn't twice, that was in older version.
My cold start with 1.1.64
http://www.youtube.com/watch?v=23q2jm2mnyE&feature=channel

[mattias]

MWfire: I am getting a bit skeptical about the cold start tuning in 1.1.64..
I have trouble getting enough pulsewidth (maxing 304%) and it begins at -10 C.
I've been using alternating injectors up till now,  and will try firing in banks/semi-sequentially starting tomorrow.

[GintsK]

Seems firing strategy of injectors do not change amount of fuel a lot.
Batch ~3ms 4 times, semi  ~6ms 2 times, seqv  ~12ms. 1time per cycle.

Mattias, can you concertize possibility to enable inject additional fuel at cranking in 1.1.63/64. Is it just VEMStune problem or firmware?
It is urgent for me. We have first race in Saturday. But I put these firmwares on two fast cars. They are about 200km far from me. I trying to solve problem from distance.

Gints

[MWfire]

You can try cranking car with fast squeezing throttle(but no more than 67%, becouse more than 67% tps is fuel cut). Then vems will inject more fuel.
BTW sandgren start car with 1.1.64 at-20C without problems. I can send you cranking values from his car.

[GintsK]

You can try cranking car with fast squeezing throttle(but no more than 67%, becouse more than 67% tps is fuel cut). Then vems will inject more fuel.
BTW sandgren start car with 1.1.64 at-20C without problems. I can send you cranking values from his car.

Yes, please send! Gintsk at inbox.lv

[MWfire]

You can try cranking car with fast squeezing throttle(but no more than 67%, becouse more than 67% tps is fuel cut). Then vems will inject more fuel.
BTW sandgren start car with 1.1.64 at-20C without problems. I can send you cranking values from his car.

Yes, please send! Gintsk at inbox.lv

sended

[mattias]

Seems firing strategy of injectors do not change amount of fuel a lot.
Batch ~3ms 4 times, semi  ~6ms 2 times, seqv  ~12ms. 1time per cycle.

Mattias, can you concertize possibility to enable inject additional fuel at cranking in 1.1.63/64. Is it just VEMStune problem or firmware?
It is urgent for me. We have first race in Saturday. But I put these firmwares on two fast cars. They are about 200km far from me. I trying to solve problem from distance

Your best option is to raise "cranking VE"  x1.5 to 2.0 to temporarily solve the problem. This will rarely cause  problems with the warm start, just press WOT to flood clear if that is suspected. At least it will solve the cold start.

I have confirmed that I need this scale-up at -10 and lower temperature, maybe at warmer temperature on some engines. The cranking table values for the cold coolant temperature for my engine are maxed out.

There is no "additional fuel" as in Andrey's initial implementation in 1.1.51, I'm not sure where this option got taken away. It is not in 1.1.63 or .64.

I will suggest to the firmware developers that the values are scaled up at least x2 because my car needs 7-8 ms at warm engine, at -15 it can barely start at 60 ms and would need 80-90 ms to start immediately.

BTW sandgren start car with 1.1.64 at-20C without problems. I can send you cranking values from his car.

"Without problems" is not true, it does start but the the values are bottomed out and it needs a few seconds of cranking to start, always starts though - rarely requires a second attempt.

[guzior]

Hi.
I have problem with trigger sync. I use 60-2, own made trigger wheel.
Engine run on low rpm correctly. But always, when engine go to ~3000rpm vemtune show trigger error and have samothing like rev limiter. All revilimters are set to ~7000rpm
What should I check? It may be wrong polaristation of VR sensor? Or maybe trigger wheel is wrong made?

[Sprocket]

Seems firing strategy of injectors do not change amount of fuel a lot.
Batch ~3ms 4 times, semi  ~6ms 2 times, seqv  ~12ms. 1time per cycle.

Mattias, can you concertize possibility to enable inject additional fuel at cranking in 1.1.63/64. Is it just VEMStune problem or firmware?
It is urgent for me. We have first race in Saturday. But I put these firmwares on two fast cars. They are about 200km far from me. I trying to solve problem from distance.

Gints

I thought that 'Fire all banks while cranking' gave you four times as much fuel during cranking, if you are using sequencial injection, and twice as much with semi. Is there anyone still running batch fire injection these days?

I personaly only use fire all banks while cranking which means that even with the older firmwares, I was no where near mxing out the pulse width that then, was a max of 25ms