View Full Version : need some input
fast75vega
12-01-2011, 02:49 PM
no give me your input o this question please!
me and my friend are talking about how if u add more hp/tq and how it will change top speed? he is trying to say that adding hp/tq will not change the top speed... that you have to make changes to the drivetrain...? what do you think?
TheYellaBrick
12-01-2011, 03:09 PM
Lots of variables to look at.
You talking top speed over just a quarter mile or farther ?
You talking E.T. ?
ANY addition of HP/tq is gonna affect speed and E.T. but it all depends on WHERE the HP and torque come in to maximize the additional power available. THAT's when you get into gearing, suspension tune, weight, and tire contact.
fast75vega
12-01-2011, 03:19 PM
Lots of variables to look at.
You talking top speed over just a quarter mile or farther ?
You talking E.T. ?
ANY addition of HP/tq is gonna affect speed and E.T. but it all depends on WHERE the HP and torque come in to maximize the additional power available. THAT's when you get into gearing, suspension tune, weight, and tire contact.
were actually talking about all out throttle twisting on a crouch rocket....! he is trying to say you cant add more fuel/air and run faster?
hotrod1994
12-01-2011, 06:57 PM
so he thinks a 100 hp rocket and 350 hp rocket with same drive train will go the same speed?
more hp/tq with the same drive train = faster might not be a noticeable difference depending on how much hp/tq but more hp/tq will always get ya going faster\drive line changes help big time like in a car but hp/tq can do the same
zipper06
12-01-2011, 07:32 PM
HP and TQ will always add to speed and lower ET, however you may have to change the gearing to get the most benifit from it.
JMO
Zip.
fast75vega
12-01-2011, 07:37 PM
so he thinks a 100 hp rocket and 350 hp rocket with same drive train will go the same speed?
more hp/tq with the same drive train = faster might not be a noticeable difference depending on how much hp/tq but more hp/tq will always get ya going faster\drive line changes help big time like in a car but hp/tq can do the same
yes... he said if it was 100hp or 5000hp....the top speed will stay the same.....lol
but you guys are saying the same thing i am.... it will increase
bluedawg357
12-01-2011, 11:13 PM
I'm by no means an expert, but I was lead to beleave that a revolution was a revolution & with the drive train being the same, regardless of horse power & torque at any givin rpm you would still be turning the same speed. Increased HP & tq just brought about how fast you could gain rpm thus making the gain in speed being quicker lowering the et and raising the top speed in the givin distance. With this being said in cars with over drive or real high gearing if you don't have enough power you can't reach the reclined in high gear. I could be wrong about this & the only thing I could use to back this up is Wallace racing has an automotive calculator that will tell you what speed you are going using tire diameter, rpm and drive ratio.
Just my .02$
cncmotorsports
12-02-2011, 05:19 AM
so he thinks a 100 hp rocket and 350 hp rocket with same drive train will go the same speed?
more hp/tq with the same drive train = faster might not be a noticeable difference depending on how much hp/tq but more hp/tq will always get ya going faster\drive line changes help big time like in a car but hp/tq can do the same
yes... he said if it was 100hp or 5000hp....the top speed will stay the same.....lol
but you guys are saying the same thing i am.... it will increase
If you have a 6500 RPM rev limiter they will stay the same speed (MPH). More power, more speed. The more power you make the quicker and harder the engine will want to accelerate your vehicle.
coolracing
12-02-2011, 06:27 PM
Depending on the rocket he is correct I worked for a dealership for many years and had a few customers come back after doing alot of work on their bikes and were upset with the bikes because top speed would not change. It was because newer rockets not all of them but some do have a rev limiter that is run by mph and you need certain programmers to eliminate the saftey option.So in some cases your not running out of power, your just getting screwed by a computer... :x
bluedawg357
12-02-2011, 09:21 PM
The only way top speed changes is if redline changes, unless the drive train final drive is changed.
BleedOrange
12-24-2011, 11:54 AM
well I would think that if you had a 100hp engine it would achieve max mph way slower than a 5000hp engine. So you would cover more of the distance in the 1/4 at top speed with the 5000 hp engine. That would make your time faster with the 5000hp engine.... my opinion
I changed motor in blazer went from a stock355 with small cam to motor i have now, same convertor same rear gears
went 12.70 @ 103 with 355 turned 5800 rpms at finish
went 10.56 @128 with 385 turned 7500 on chip at finish