Hi Alex,
you probably inject a mix with high methanol content. That would explain the low air temps.
I only inject pure distilled water at this time. I have all intake and turbo housing + exhaust ceramic coated. After a run you could feel the intake plenum like a fridge cold.
Also your turbo charger seems to run in a really efficient range.
Yes, I calculated CFM according engine vs turbo in order not to choke nor surge the turbo
I'd still consider adding even a small charge cooler. I use a PWR barrel charge cooler.
I barely adds any volume.
http://www.chargecooler.co.uk/index....index&cPath=67
Spool time should not really affected by a few liters of volume, especially as you have a throttle body right on the intake plenum. Your turbo is still spinning pretty fast after you press on after gear change. A front mounted one might add a few ms.
your turbo pumps out 100 liters per second at 1bar or 200l at 0bar. To fill a charge cooler of 10l of volume after a gear change at full chat from atmospheric to 0.5 bar takes mere milliseconds. From 0.5 to 1 bar an other few more. You won't feel it.
Thank you for your suggestion, I will consider it if pre-compressor injection is unsucessful
You plenum does the same as mine. Air speed drops as air is consumed from plenum intake to the last cylinder. Usually the first one gets the most and the others less.
The design itself, e.g. inlet angle and diameter, can change the distribution to a degree. But in general it fits the picture. First one gets the most air and the last the one the least.
In my case 1 is lean and 2-4 are about equal . In you case 1-3 are equal with 4 being rich :-)
Actually mine is 2-4 are equal while 1 is rich. Throttle body is on the 4th cylinder side of plenum. I solved this issue by reducing fuel on that particular cylinder only.
The ideal forced induction plenum with a side intake is either fed by a secondary plenum and a long slit. The secondary plenum having a conical shape with the diameter reducing to 25% of the cross section.
The other solution is actually to reduce the cross section of the plenum chamber itself from 100% to 25% at the last cylinder.
This way air speed and with it pressure and flow stay uniform across all 4 runners.
see:
http://honda-tech.com/welding-fabric...folds-3016531/
and:
http://www.clubgti.com/showthread.ph...final-cut-done
If I ever being bothered I might try it, but space is really tight.
Mine is tight also, It could barely hit the front panel as it is.