VEMS I5 Maps

[GazzaG60]

on ait i dont think it makes much difference to be honest. heatsoak is the issue so although i feel the air is similar temp the surrounding areas are not. its harder to get good accurate air with the stock manifold i think is the issue.
the bigger wagner cooler helps when the boost and turbo flow is higher than stock but on stock unit i feel the cooler is more than adequate.

the timing on a stroker will be different but the biggest factor is turbo size and boost pressures. depending on turbo and where its "on" will depend on peak ign values. ie i know vas has a peak lower than me on ign on boost as his turbo drops away sooner. i can see this in the timing map. i can hold more aggressive mid range timing for longer too as i have more lag.

what must be rememebered is the sunco 94 in the states is better than our 99 ron tesco. so more timing.

[A80Avant]

looking on the table i must say that on the high boost areas there is more timing than my map. On cruise there is less. I cannot say anything more as a stroker engine seems to have different characteristics than the oem.

[Billman]

check my log above. It is with 13 degrees outside temp and gives 22 at 1.3 bar. I have big IC.

apart my RS2 has no plastic pipe :-D (factory spec)

[Jamo]

Thats what i dont see. The surface of the intake path is very low in order to exchange enough heat and raise the IAT because tha air mass is very high.

Datalog the the temps of a reverse car and then compare it to the same spec car without the reverse and you will see a big difference in temp.

The intake pipe heatsoaks badly on the stock setup, the plastic pipe isn't as bad on the RS2 for this even then.

[Billman]

he is referring to the IATs that the reverse manifold can help keep low

Thats what i dont see. The surface of the intake path is very low in order to exchange enough heat and raise the IAT because tha air mass is very high.

[loxxrider]

right, I was curious to see if he meant because of dome design or something of the sort. I understand how higher CR is more prone to knock. I have had some thoughts on this. I'm not an advocate of running lower CR unless its absolutely necessary to avoid knock. On race gas, meth, or E85 this is especially true. Thats for another thread however.

BTW Jamo, I decreased req fuel by about .57 and increased VE map by the same factor. The car runs exactly the same but seems to be more responsive to small adjustments to the VE map. I also increased the MAP samples to 10 as you suggested. I was able to turn the boost up to roughly 17psi (or 216 kPa) and did some more fuel tuning to get it closer to .85 lambda. Its still rough, but better than before. I'll post the map as soon as I get a chance to grab it out of the ECU. Still needs about 5 degrees all over the timing map and probably more in some places. I'll be sure to keep this updated with new and improved maps.

[A80Avant]

he is referring to the IATs that the reverse manifold can help keep low

[Billman]

Stock CR will be more sensitive to high MAT temps and increased boost causing knock / detonation.

Reverse manifold always help here and a good IC

Seen some cars tuned well on stock pistons however

Dont see how the reversed manifold helps there but i am with you on the rest.

[Jamo]

Stock CR will be more sensitive to high MAT temps and increased boost causing knock / detonation.

Reverse manifold always help here and a good IC

Seen some cars tuned well on stock pistons however

[loxxrider]

why do you think the knock is because of stock pistons? Do you mean because of stock compression ratio?

[A80Avant]

ah i see.
then ill have a look at the map soon

if pistons are OEM, then the knock could be because of them. I know of a stock rs2 with similar map to mine, and it knocks like crazy above 1.3bar

[Jamo]

i have high timing on cruise and recently uped it a bit till 140kpa. Still working on how the car behaves in cruise. However as megatune does only have a generic IAT to timing curve reduction, it may be that you are knocking because it is not retarded enough for those temps.

having said that my motronic kept that timing up to 44C IATs which i somehow dont believe as i have seen some old vagcom logs

He's on 1.1.64 I think so it's vemstune with the retard table.

30-40c is high, I need to get the 1.8t MAT in mine to double check but 1.7 bar and 17c temp, tribute to Wagner IC!

[Billman]

i advanced the timing and it sounds much better now but i was not able to make longer runs since is pouring today.

the EGTs are still very low (but still it is a short run so there is no time to raise much).

[A80Avant]

i have high timing on cruise and recently uped it a bit till 140kpa. Still working on how the car behaves in cruise. However as megatune does only have a generic IAT to timing curve reduction, it may be that you are knocking because it is not retarded enough for those temps.

having said that my motronic kept that timing up to 44C IATs which i somehow dont believe as i have seen some old vagcom logs

[GazzaG60]

my timing is about the same as Vas has. he has more in some areas than me but i think thats turbo dependent too. i got a few degrees here and there in the kit bag still i think.

i can tell this by the changes in cell to the egt.


illpost a map soon. probly not to many's taste my setup but there goes. also its 1.1.23rc. im yet to upgrade.