High RPM: How to Get It & What It Means

Do you like to go fast? Well get out of that stocker and build a hipo motor for your VW. Come here to talk with others who like to drive fast.

Moderator: Tom Notch

TeamEvil
Posts: 227
Joined: Tue Dec 02, 2003 6:32 pm

Re: High RPM: How to Get It & What It Means

Post by TeamEvil » Thu Dec 09, 2010 12:09 pm

Even though the engine isn't making power after a certain rpm, if the rpms continue to climb, does that mean that the speed continues to increase as well. Say on a fairly flat roadway?

Always wondered.

Thanks!

Bruce2
Posts: 6770
Joined: Sat Oct 13, 2001 3:01 am

Re: High RPM: How to Get It & What It Means

Post by Bruce2 » Thu Dec 09, 2010 2:09 pm

TeamEvil wrote:, if the rpms continue to climb, does that mean that the speed continues to increase as well.
As long as the clutch isn't slipping.

User avatar
FJCamper
Moderator
Posts: 2670
Joined: Wed Nov 14, 2007 5:19 pm
Location: Birmingham AL

Re: High RPM: How to Get It & What It Means

Post by FJCamper » Thu Dec 09, 2010 3:08 pm

Hi Teamevil,

The increased rpm's and exhaust noise do quickly reach their own limit once the torque/horsepower limits have been exceeded.

FJC

Bugfuel
Posts: 3011
Joined: Fri Apr 20, 2001 3:01 am
Location: Front Royal, VA

Re: High RPM: How to Get It & What It Means

Post by Bugfuel » Thu Dec 09, 2010 10:31 pm

depending on gearing, it is often still beneficial for maximum acvceleration to rev past the torque and power peaks, just to get the rpms high enough for the next highest gear to start pulling clean and strong. If you upshift just after the power or torque peak, you will need to use a lot of less powerful time to let the engine reach the peak again in the taller gear.

User avatar
Fiatdude
Posts: 943
Joined: Mon Oct 12, 2009 8:58 pm

Re: High RPM: How to Get It & What It Means

Post by Fiatdude » Thu Dec 09, 2010 11:33 pm

unless you have a turbo LOL

User avatar
fastback
Posts: 1670
Joined: Wed Sep 12, 2001 2:01 am
Location: Norway
Contact:

Re: High RPM: How to Get It & What It Means

Post by fastback » Fri Dec 10, 2010 3:47 am

in those cases u have to look at the HP curve. to se how much HP drops.and compare to where u end up after a gear change
if it drops faster/lower than than the readings before the peak HP.
u want to be in the RPM area where it makes the highest average HP

User avatar
WickedWagens
Posts: 691
Joined: Fri Sep 02, 2005 11:33 pm

Re: High RPM: How to Get It & What It Means

Post by WickedWagens » Sat Jun 24, 2017 12:18 am

What do you change long block wise in a high rpm build?say 7-8k rpm. Bearing clearance, oil pump size, etc?
1968 Ghia Land Speed Car
G/CFALT 106.643 MPH 8/2016
G/CGALT 113.131 MPH 9/2016
G/CBGALT 134.606 MPH 8/2017
G/CBFALT 146.715 MPH 8/2017

Post Reply