# Thread: HP gains, I'm just curious

1. ## HP gains, I'm just curious

So with all the mods we do, what are the actual HP gains we see. And for every x amount of rpm = x? of hp

Riva or similar intake
Riva free flow exhaust (07)
Riva water box
I/c reroute
1:1
1.05:1
6 degree timing mod
09 pistons/cams = 10hp
rogue cams
j/e pistons
ecu with the above mods

2. Ok surely there is an answer to these it doesn't hAve to be exact

3. Im sure you could do some calculations based on 250 hp at x horespower and rpm, then use a calculator similar to a drag time calculator and based on that and your increased rpm you could figure out horsepower, I think this would only work with the stock prop though, you have to keep one thing in a system constant to solve for another.

Sean

4. i suppose it could be done that way, but it would be nice to know what actual HP increases we see with each add on component. 1 hp for the exhaust for example, 5 hp fpr the timing mod, etc etc. After all mods i'd say I gained about 300 plus rpms but what does that mean in hp increase. But again I have an impros modded stock impeller. Maybe im anal but i like to know that data.

5. Hooah what kind of increase in top speed did you get with the impros mod? and what level or mod did you get done? just curious, I was thinking about sending off my pump to them but want input first

6. for that i would say you need to dyno it then,

Sean

7. i guess i'm used to automotive...cold air induction 5 hp, headers 10 hp, porting of heads 10 - 20 hp, performace intake manifold 30 hp and so on....

adding race exhaust on my old zx7rr 5hp, porting heads and valve train/cam work 15-20 hp, and so on...

surely riva would know how m a uch hp increase the free flow gives, if the 6 deg timing mod give you up to 300 rpms tht has to = a certain amount of hp,......i know jw on the 250xtech site did some calculations of hp on his site so i suppose we can calculate the the hp increase from there

and to answer the question about impros mod and what it contributed to my speed???? i dunno my best stock was 66.5 running on empty my best this year after all the mods was 70.9 but i do know it was a factor and worth the cost