Originally Posted by s2000Junky

Man I have a 9.5:1 comp engine and I maxed the 1200 blower best I saw was 21psi and honestly the car did go like a bullet but down low the compression loss I feel was too much. I suppose if I went 10 or 10.5:1 I would have been much better.
Before I blew a headgasket via a bad rad cap, my engine was built for high comp n/a 13:1comp and on 10psi with the SOS kit down low went like a train compared to my 9.5:1 (changed pistons) on 21psi.
This was all done on e85 just incase anyone thinks I was crazy

All in all from my experience the car went MUCH better with the higher comp in the low to midrange. I didn't have big enough balls and bankroll to risk going higher psi on that compression. I was even thinking of boxing up my itb setup and using it with my SOS kit but lots of time and money involved to tune it right, so I scrapped that idea.

I am now finishing the fb stage 2 install, but I would love to see what route you go and how it all turns out. Goodluck hopefully some of my experiences can help you out.

Also forgot to mention don't let s2kadrenalin's experience deter you, there arent many competent tuners here in Australia. Also from what I heard and read on here the engine may also have been an issue. Feel for him though he went through hell with that car.

Originally Posted by CD7SirAccord

The compressor surge issue pertains to closed throttle and part throttle. Since the blower CFM is dictated by RPM of the crankshaft, unlike a turbo with exhaust spooling the turbo. The CFM flow of the N1500 is a lot higher during off throttle and high RPM. When you are wide open throttle and close the throttle blade, the impeller is still spinning at a high speed, if you do not have a big enough BOV the air will not be evacuated fast enough and the air from the blower will collide with the air not evacuated. Some say that the air coming back would be enough to put a large load to the impeller and possibly even stall the impeller and back spin it, but I can't see an impeller spinning 60000 rpm just stop and go the other way, especially since it's driven off the crankshaft, I could be wrong though. The same thing can happen if you are at high RPMs partial throttle, it is not moving enough air through the engine, but it is still producing a large amout of air from the blower and it has nowhere else to go.

Definitely looking forward to the outcome of this with the lower compression and the bigger blower. I've often thought about upping the CR on a blower motor and maybe run less boost or keeping it the same. Who know's maybe it would like it. Lol

Originally Posted by soulicious

A couple months ago, I was looking into getting the 1500 instead of upgrading to the 1200, but changed my mine (I have an E85 tune). You'd need a bigger crankshaft pulley (ASP has 7" on file and the turnaround time was like 3-4 weeks). I think ilovemyhonda1984 mentioned in some thread that he he only got 16psi using the stock crankshaft pulley.

Originally Posted by camuman

F to the yeah!

but get a real tuning solution!!!!!!!!!! no piggy back crap. PLEASE!

Originally Posted by s2k manic

i have a turbonetics godzilla that closes at 2 inch vacuum i would thing two bov one that closes at 0 one that closes at 3 psi should let the rpm of the motor be high enough to take in all that air and not surge or one really big bow 2.5''?