928GTSM wrote:
:) Brett, thanks for taking me through the basics, I just about grasp the theoretical side I was just curious at what point the theoretical output became liimited by physical factors? Will the engine flow the sort of volumes required to produce the power needed or will the limit be pretty much dependent on gearing. I understand that with more torque, especially if it can be spread across the rev range that the car should accelerate quicker, which if your chasing quarter mile times is beneficial, but presumably there comes a point where even if you can produce the full power the system may be capable of, a large percentage of it becomes redundant due to either the engine being unable to flow the volumes required or running out of gearing.
Hi
Good questions again....
Ok....when you say "flow the volumes" what you actually mean is inlet and exhaust valves.... and exhaust system....
First Intake valves are bigger, but with Nitrous that does not matter much as the LIQUID NITROUS sort of cheats the valve as a LOT more liquid can pass a valve than as a gas...
So inlet valve size in unimportant with Nitrous as long as it arrives as a liquid....take my word on my race pro system it does....
Then you have cylinder capacity ..again take my word there is more than enough for my system or any other...hard to explain easily, but think about turbos and superchargers...they don`t have to have larger capacity cylinders for the same reasons...
Then you get to exhaust valves AFTER the cylinder firing.....there is ALWAYS less exhaust gas then inlet gas (HENCE smaller exhaust valves although it has a lot to do with cam overlap)
So exhaust valve size will not limit Nitrous.....
Then we get onto the Exhaust system..... now this one is a problem for a LARGE Nitrous system like mine....to prevent reversion (where the exhaust gases try and re- enter the engine) you NEED an almost totally free and large bore exhaust system...
In my case , the front boxes on both pipes have been removed, as have the 2 middle resonators and the ONLY exhaust box I have is a twin rear box which is straight through with a little outer silencing material, but at 6000 revs it cannot be read on my decibel meter as mine only reads to 130 Db....lol
But it is a glorious sound as many who have heard it on this forum will say
The gearing point is valid , particularly for 1/4 mile times...but mine is NOT designed for 1/4s , its for top speed where the gearing is long not short... so not such a problem.....
Phew....again I apologise if this sounded condescending , but I am trying to compress years of knowledge into a few short paragraphs and its not easy, so apologies if it does not make a huge amount of sense...
As for limiting factors...I don`t THINK it will be the engine, I am pretty sure from experience it will be something mechanical...shafts or t.tube or autobox etc.... which is why my controller SHOULD keep the torque hit non existent by being perfectly smooth....in theory lol
All the best Brett
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Should be fun finding out though. 
