Why not NOS?

[Brucelee]

I suggest you peruse the IMS posts on this board. Given that their is a structural flaw that allows engines to greanade, personally, I would be loathe to experiment with MY engine.

Of course, we are happy to have you try it and report back.

Good luck and go with God.

[dmcutter]

I have no intention of being a guinea pig. Since the car has been out, what, 11 years, I thought somewhere someone must have given that idea some thought and I wanted to know the nuts and bolts of why it couldn't be done. I figured $500 was overly optimistic because nothing can be done cheaply to a P car. The key, as many have pointed out, is a properly designed system and it doesn't look like there is such an animal available off the shelf. I would prefer a turbo because I know that's been done and it would be usable on a daily basis.

[RandallNeighbour]

http://www.andysautosport.com/porsche/1997_2004_boxster/performance/nitrous_oxide/nitrous_oxide_kits/nos/

I'd prefer a turbo too. It's just 10x more $$$. However, it's under your right foot any time you want it and there's no bottle to refill.

[jay3000]

Originally Posted by RandallNeighbour

http://www.andysautosport.com/porsche/1997_2004_boxster/performance/nitrous_oxide/nitrous_oxide_kits/nos/

I'd prefer a turbo too. It's just 10x more $$$. However, it's under your right foot any time you want it and there's no bottle to refill.

Well. Looks like you've found your kit. The questions now are, where do you put the fogger? Where do you get a TPS signal? Where do you mount the bottle? Etc..

Surely this motor can support a 75HP shot. ( a honda civic can) If the bottom end can support 75 HP from a turbo or SC then this would be no different. The cool thing about EFI is that if the jets for the nitrous are slightly rich or lean the system will make up the difference in a matter of milliseconds. Another cool thing is that the engine likely has a knock sensor and can retard the timing if that should prove to be an issue.

[Brucelee]

Originally Posted by jay3000

Well. Looks like you've found your kit. The questions now are, where do you put the fogger? Where do you get a TPS signal? Where do you mount the bottle? Etc..

Surely this motor can support a 75HP shot. ( a honda civic can) If the bottom end can support 75 HP from a turbo or SC then this would be no different. The cool thing about EFI is that if the jets for the nitrous are slightly rich or lean the system will make up the difference in a matter of milliseconds. Another cool thing is that the engine likely has a knock sensor and can retard the timing if that should prove to be an issue.

You seem certain that the Box can deal with the NOS hit. I am curious as to why you believe this?

[jay3000]

Originally Posted by Brucelee

You seem certain that the Box can deal with the NOS hit. I am curious as to why you believe this?

Can the bottom end handle 75 HP from a turbo or supercharger?? What would the difference be???

[Brucelee]

Originally Posted by jay3000

Can the bottom end handle 75 HP from a turbo or supercharger?? What would the difference be???

It seems the IMS is the weak link in the Box engine. How might that be effected by a boost from either a Turbo or NOS.

It is interesting that Porsche has never offered up a Turbo on the Box. This is kind of out of character for them, as they have put them on many past models.

That could be coincidence or not. I guess I never thought of that before?

[skip_168]

Originally Posted by jay3000

Can the bottom end handle 75 HP from a turbo or supercharger?? What would the difference be???

ok, well here is the deal..

A turbo or supercharger takes air,(19% oxygen), and compresses it.. The fuel injection system can keep the air/fuel ratio at about 14.7 to 1 even with the extra oxygen & air from the turbo or supercharger.

With NOS, you are injecting liquid Nitrous Oxide into the engine, about 200 times more oxygen than the fuel ingection system can handle. If left to it's self, this would lean out the mixture & act like a blow torch and melt down a cylinder head.. this is why a NOS system has an additional fuel nozzle with the NOS nozzle.

Here is the real problem: getting the mixture right

I know the companies who make the systems say its all good, but if you are off on the mixture by even a little bit, your 10k boxster engine will turn into a boat anchor in about 25 seconds...

Now back in the day when I was building air cooled Porsche engines, NOS was a BIG NO NO.. just due to the fact that the extra HP brought along with it alot of extra heat that an air cooled engine could not get rid of fast enough..