Not sure how that's possible. Assuming your vtec engagement point is still at the stock 5850 rpm, it should feel pretty violent in the first few gears, certainly more then stock. Not sure how your car feels slower then stock, unless I am misunderstanding your description.

 

S2000's rev high which eats up duty cycle pretty quick.

Our 725's are a little bigger than what you'd need for 350whp at 9k, but I guarantee you they'll run better than any other injector in the 400cc+ size range. Not all injectors are created equal, you can't generalize performance based on size. Check out www.InjectorDynamics.com There's some good info on there.

 

^^^ suffering in low end response , idle and general fuel atomization in partial throttle is more of what I was referring a problem in a larger injector. At 9k its not the same consideration. So are you saying you can tune fuel trim across the board with a 725cc with good as or better atomization then a typical RC 440cc for example?

 

I guarantee you can with these. These have almost 100% linear flow down to about 30cc/min and have FAR better atomization than the RC 440's.

Sometimes it helps when you step back and look at it this way. Most of the injectors on the market right now were designed in the early 70's. They have remained unchanged since minus some 'flow modifications' some perform, which generally only makes them a worse injector but flow more. These new injectors are from this decade. lol These were designed in '02. Think about how far technology has come in 30 years. Is it really hard to believe there can be something this much better than the old stuff that's out there?

I can promise you this, money back guarantee, that if you put a set of these 725's in a car, you wouldn't be able to tell the difference in idle quality, driveability, fuel efficiency, etc from a stock injector, assuming the car is tuned properly.

The fact that these are really good injectors is half the reason, the way they're tested and paired based on both flow and injector dead time is the other half. There are some charts on my website with the injector pics that show fuel flow deviation from a set of injectors that are not matched based on injector dead time vs. a set that is. The flow deviation at low pulsewidths can be as much as 5-10%!

 

^^^ interesting, sounds really great. I will consider these for my next injector purchase.

 

I have it set at 4k. And it does not feel like it engages. The dyno sheet is almost a straight line from bottom to top. Or maybe i just need atleast 400whp to be happy. I just will have to keep building until i get scared. That is when i will stop.

 

Unfortunately what you're seeing is normal for a centrifugal supercharger. It makes boost linearly with rpm so it never 'hits' hard. Just smooth power all the way to redline. They generally like vtec to hit around 4k and the power curve should be seamless when vtec engages so you won't feel it hit.

 

the 725's should be great for your power goal, since they leave space for more power! i rock 650's for 350whp, and will be going to 370whp soon. they idle fine and part throttle is fine. 725's should be no problem.

 

Okay, so I will be purchasing these as soon as I find some stuff out about the fuel rail. Will the stock fuel rail be sufficient flow? I just ordered a 4'' pulley from ASP the other day and will hopefully be putting down close to 400whp with a good tune. Along with the 725cc Inj. Dyn. ones will I need particular clips? Thanks agian for all of your help guys.

Tony, thanks for the input, you've got my purchase on the way

 

Stock rail is fine and I think they come with clips