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Message: [QUOTE="peixinho, post: 879867, member: 12240"] This is a very good point and something that I have been thinking about a lot. I personally feel that the smallest nozzle possible with the highest amount of ICP will produce the lowest temps and highest power. No reasons to stick 150s on a 155 injectors... 155/150 would be stupid... why... because you don't need that big of a nozzle to dump that much fuel. I think it is important to create a good ratio of nozzle to fuel dumping goal. For example: 75% nozzles at 2.4ms dump 240cc of fuel. Now these are just simple examples and do not take into account ICP... but lets just leave that at a constant for easy figuring. how much fuel do you dump if you have 175/75 and run 2.4ms??? You still only get 175cc of fuel. What about at 1.75ms??? theoretically with 75% nozzles you will dump 100cc per ms. So at 1.75ms will dump the same amount of fuel as 2.4ms. That makes it more difficult to tune and pull fuel to provide a good tow tune. Because the max tune dumps the same amount of fuel as a tune that has slightly pulled a little bit of fuel. how much fuel do you dump if you have 175/30 and run 2.4ms??? Theoretically 30% nozzles will dump 75cc per ms. With 2.4 ms you still only get 175cc of fuel. but at 1.75ms you will only dump 130cc of fuel. This makes it easier to control how much fuel is being dumped. Therefore making it easier to tow with. So it just comes down to picking the max ms of pulse width desired. Calculating backwards, and then picking your nozzle size. (once again assuming max ICP) So adding bigger nozzles does not make "more" power... it just gives you the ability to dump fuel faster. Smaller nozzles make it easier to tow with and get better atomization. This is something that I would like to be able to take advantage of. Let me pose the question to you... why use such large nozzles? :shrug: [/QUOTE]