higher rpm on NA cars?

[Rikaro]

i've searched on the forum but i can't find anything.

I want to make some cars having higher rpms.

For example, is it possible to get a normal s2k over 10000rpm?

same with the 92-95 civic, and the spoon civic

 

[Tornado]

The most RPM you can usually change on a car is about 400 RPM for cars that will allow all 3 stages of NA tune. Stage 3 adds 300 RPM (typically), and one of the two unchangable mods (Port & Polish or Engine Balancing) add 100, but I'm not sure whihc on does which.

 

[Rikaro]

nothing that can get me loads of rpm boost without a big hp upgrade?

 

[rovens]

The engine rebalancing (i think) raises the rpm and also resets the rev limiter, try that.

 

[Famine]

nothing that can get me loads of rpm boost without a big hp upgrade?

Technically, the two are inextricably linked.

 

[Tornado]

nothing that can get me loads of rpm boost without a big hp upgrade?

No, not really. The biggest contributor to a higher RPM band is the stage 3 NA tune, which adds a large quantity of power to your car.
The Engine Balancing (if rovens is correct) adds only a smidgen of power and resets the RPM gauge, but it only adds 100 RPM.

 

[shabba]

In the game there is no way to do what you want to do. The only way to increase RPM is with the NA tune and the engine balancing - however the effect on redline is minimal, while the increase in power is very marked with the NA tune. There is no way to increase redline in the game without increasing power.

In real life, however, you would weight-match and balance your moving parts, change your cam-shaft profile and valve springs to increase the potential rpm. It's not just the rpm itself that destroys and engine - rather it is usually the vibration or lack of oil supply at high rpm that blows an engine. At high rpm, if your valve springs are not strong enough, your valves can 'bounce', which causes a lot of problems. If there is a difference in moving masses between the crankshaft, con-rods and pistons, then you set up nasty vibrations in your engine. If your oil system cannot handle the demands of your engine at 10,000 rpm, then you will blow your engine apart. It is a lot of different things that need to be balanced out to allow your engine to run at higher rpm.

However, higher RPM doesn't always mean more power. Your camshafts are optimised to run best through a certain rev range. After that, it loses efficiency and your power falls away. So to make power at high RPM, you need to change your cams and valve system. Trouble is if you do that, you lose bottom end torque/power - the car becomes less driveable down low.

Lower bottom end torque/power means you need closer gearing to keep the engine in its powerband. It also means that because your powerband narrows, you'll be rowing your gearshift like a bilge-pump to keep it there. It's a very delicate balance, especially in smaller engines. Winding out your engine rpm without increasing the performance up high is pretty pointless. Most smaller performance engines have phenomenally high redlines to make enough power to disguise the fact that they have stuff-all bottom end performance.

With the mods mentioned above, we have a 350cui chevy V8 that will run out to 8,500 rpm. Try that in a stocker and you'll be eating valve-spring soup.