Dyno numbers are in and as usual Torque was king gaining 57 rwt and HP always trailing behind on the A2A KB setup with a gain of 35 RWHP for a total of 550 HP and 685 TQ. The meth came in at 5 psi with a 9gph nozzle after the blower and ACT sensor so the ACT temps don't reflect meth cooling. Total timing was 22 degrees and was only a marginal improvement over the first run at 20*???? ACT temps I mind you are not from the number 5 runner but rather my 05 slot style MAF in the 3" pipe which is in blow through configuration right before the meth injection and KB intake. ACT temps were 108 on the first run and went as high as 124. Ambient temp was a cool 65, but again remember these temps would be lower if the meth injection was recorded through the AIT sensor. I ran a very small custom made 2" 8 rib KB pulley and the lack of belt dust is evidence the 8 rib system is working and no belt slip was recorded on the data logs or dyno graph. With the 2" blower pulley and 7.5 inch crank I was maxing and more the rpm limits suggested by KB for the little 2.1 KB with a total of 22,500 rpm at 6k rpm.
I ran the car on the Dyno and was watching my Engine speed through the Binary Editor programs data logger and some how the rpm stopped increasing on the program I was watching at around 5400 rpm. I new something was wrong as I could hear the engine spinning up higher and higher. I finally let off and when we looked at the dyno graph which was recording my engine speed as well it hit 6,400 rpm engine speed and blower rpm of 24,000 rpm.....OOOOPS. This put my blower way out of its efficiency range and max suggested rpm of 18,000 by KB. The funny thing is the A2A kept the ACT temps at 108* on that run, so it's working. I have heard that KB has tested them to 24K and mine confirmed it. Granted this was a mistake and I'm wasn't really trying to max it out. Anyway total boost was @ 16psi starting out and dropped of at 4k 1 psi and another at 4500k for a total of @14 psi at 6k rpm.
I would have hoped for more out 3/5 psi gain from the last dyno session seeing that ACT temps were approx the same and total timing as well. Many would say run more timing since you had meth injection this time, but with a meager increase in power I saw from the first run at 20* and the second run bumped to 22* I saw no reason to add more.
Again this is a street car with a mild street grind cam and small 170cc TW heads so in the end I can live with the numbers....well at least for now
Time to lay this power down for real.....At the track.
I kind of thought that the outcome would be something like that. That said, I have a suggestion that goes against the arguments I made earlier (yeah yeah, I'm playing both sides). LOL
Try opening up the intake tract. I don't recall what the sizes of the TB, spacer, and MAF, are that you're running but if they're 75mm then it's time to open up into a 80mm and see if there's a difference. You should see a 3 to 4 lb change in boost pressure if you're running a Flowzilla inlet. The bonus will be that you shouldn't see any rise is blower exhaust temps. If you do in fact, get the 3-4 psi increase that I think you should, then you could try once again to spin the blower a little faster and get the results you were looking for in this last test.
My thought here, is that screws are not as saturated with air mass as they could be with the size of the current inlet.
If I'm wrong, it's because the blower housing itself (namely the housing inlet), or the inlet side of the screw lobes ARE saturated and it's taking in all the air it can get past the forward portion of the screws. In other words, the portion of the screws that are exposed to intake air are saturated and not able to move air out the way fast enough to fill the entire length of the screws with air.
Anywhoo... worth a shot if you wanna keep going. Swapping to the Flowzilla inlet was worth 4 psi all by itself on my combo. Going to 80mm TB and spacer was worth 2-3 more... all with no pulley swaps.
I think the reason you're not seeing much effect with the meth (if I understand your post correctly), is because the over spin of the blower is largely diminishing the returns you're expecting from the meth. So... open the inlet and try the meth again.
Just thinking out loud.
By the way... you got pics of how you plumbed the water/meth in?