Originally Posted by pwpanas
Nitrous can be used for two different purposes on a turbocharged purposes.
1) To spool up the turbo quicker
2) As a power adder (stop spraying when turbo hits boost)
3) Both of the above
For "1)", there's a bit of an issue - spraying nitrous below 3,000 rpms is not recommended (unless you have a progressive controller, properly tuned). For example, if you spray a 175 shot of nos below 3000 rpms and (worst case) you choose not to radically retard the timing, the connecting rods will probably bend (yes, even on a 2jz-gte). How much the rods bend depend upon how low below 3000 rpms you spray.
...Sooooo, this means that the only turbos that would really benefit from a nos spoolup are ones that aren't anywhere near spooling up at 3,000 rpm. This usualy means a VERY big turbo (eg. 88mm, 92mm, 101mm, etc.). Your 67mm turbo should be well on the way to being at least partially spooled by 3,000 rpms (depending on your exhaust housing a/r), and therefore is a bit too small, imho, to benefit from a nos spoolup.
Therefore, may I conclude that you wish to utilize NOS as a power adder? If so, there's really no limit to the size of shot you might run, as long as it's properly tuned. If you're looking for a cost-effective setup, then you'll probably want either single or dual fogger, which limits you to about a 175 shot at most. Above this point you need to go direct-port (with six foggers, one in each intake runner). With direct port, again, there's no limit - you could run a 1000 shot and add 1000hp worth of nitrous. Of course, with that big a shot, you'd need MT slicks for it to hook up, a fully built 2jz-gte bottom end, and weeks and weeks of dyno-tuning...but it (really!) can be done.
Oh, and do you plan to spray a wet shot with the nitrous system, or will you be adding the 'wet side' of the shot with overspec'd fuel injectors and the AEM?
Tell me your thoughts about what I've written so far, and I'll suggest a kit for you. Direct port? Spool or power adder? etc.
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