mutantZ Posted June 3, 2013 Share Posted June 3, 2013 How does NASCAR, as well as other racing groups, make so much power even when they are so restricted on airflow? Granted they would make 750+ without the plates, they seem to do pretty well with them in. Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 28, 2013 Share Posted July 28, 2013 Restricted is all relative. The Z32 VG30DETT made 750HP through twin 26mm restrictors on the turbo inlets, and 1100 without them. But the drivers (Millen namely) said the better torque of the "restricted" engine made the car FAR more driveable. In 1100 HP trim, it was likely "Bonneville Only"! Restricted doesn't necessarily mean bad... The documentation on how they get what the get is well documented on the NASCAR Fan / Tech Sites, and the mechanics are lightly touched upon in the "Small Port Heads" thread here... Quote Link to comment Share on other sites More sharing options...
johnc Posted July 28, 2013 Share Posted July 28, 2013 One of the tricks for a restricted NA engine is to build as large a plenum as possible behind the engine. Another is to build a lower (relative to unrestricted) rpm torque engine with more gears in the trans and tighter ratios. The time between more frequent shifts, some creative plenum, design, and unique valve timing can develop positive pressures in the plenum for brief periods. Quote Link to comment Share on other sites More sharing options...
johnc Posted July 28, 2013 Share Posted July 28, 2013 And then there was Toyota's amazingly engineered and highly illegal turbo restrictor that got them permanently banned from the WRC. http://forums.beyond.ca/showthread/t-331465.html Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 30, 2013 Share Posted July 30, 2013 Highly Illegal? John, only because they were caught! Scrutineers are expected to have King Kong Thumbs to depress those items which should be immovable! LOL Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.