A few questions concerning preTurbo water injection

[parmas]

Originally Posted by mrx79

Hi,
did some tests with WM50/50 (by weight) today. But not very much luck.
Car is still slower and makes less power with WI activated.

My parameters are:
max. Boost: 1,25bar (with WI boost drops to 1,1bar)
WI activation at 0,6bar
same ignition advance (aprox. 22.5btdc under boost)
played a bit with afr, but almost no difference between 0,8 and 0,85 lambda.

max. tq /wo WI = 355Nm
max. tq /w WI same AFR =323Nm
max. tq /w WI -5% AFR = 331Nm

I'am still fear that my nozzle is just too big (for my conservative tune/boost levels) as i have a water-to-fuel ratio or 60% at activation boost pressure and it will go down to still 23% at 8k redline.

As a guideline i inject 350ccm of WM mixture on my 1,6L engine.

Anyone any more ideas or should i try a smaller nozzle?!

You cannot make more power with water/meth injection especially because you are leaving ignition advance the same!

With water + meth injection there is need for ignition advance due to slower burn rate. So to compare you need to max your ignition advance without water/meth injection until you see some power/torque go down and back to 2-3 Degrees for safety then turn on water/meth injection, set 15% if you are intercooled or 25% if you are non-intercooled, put car on dyno, increase advance after 2psi boost where water injection begins. Keep increasing ignition advance until you see a drop in power and again retard 2-3 Degrees. Now compare and you are doing more power and torque with water injection on !

What Air Temps are you seeing?

[mrx79]

Intake Air temperatures are 24-28?C (sometimes 30?C).
First number is at the beginning of the 3rd gear pull, second at redline.

I understand what you say, i'am just not very compfortable with higher ignition advance numbers right now. Don't want to hurt something and i stayed away from high boost much advance tuning until now. ;-)

I think i just have to get warm with it...

the 22.5 is pretty much the safe MBT for that boost Level. Checked that in a series of dyno pulls without WI.

Do you have a (very) rough number on how much more advance i would normaly need or at least which would be definitly too much advance?
Do you think i should see a regain of Tq. by adding a series of +2, +4, +6 degrees? or do you think i would need even more?

[RICE RACING]

Originally Posted by parmas

You cannot make more power with water/meth injection especially because you are leaving ignition advance the same!

With water + meth injection there is need for ignition advance due to slower burn rate. So to compare you need to max your ignition advance without water/meth injection until you see some power/torque go down and back to 2-3 Degrees for safety then turn on water/meth injection, set 15% if you are intercooled or 25% if you are non-intercooled, put car on dyno, increase advance after 2psi boost where water injection begins. Keep increasing ignition advance until you see a drop in power and again retard 2-3 Degrees. Now compare and you are doing more power and torque with water injection on !

What Air Temps are you seeing?

You are mad!

You are basically giving this poor man advice to blow up his engine! that is very poor of you, what cars have you done or set up ??????? not many by the sound of it.

Please do not hand out advice to people when you have not one idea of what you are talking about or the end disaster it will cause the owner.

Thanks!