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Destroyer of Sidewalls
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Discussion Starter · #1 ·
Some interesting posts from the SE-R mailing list by someone that knows what they're talking about:

Just saw some dyno results from the testing of the lastest QR25 parts.

The car did 175 wheel hp and 174 ft/lbs of torque with the prototype Hotshot header, JWT POP, stock exhaust, removed balance shafts and proto JWT cams and valve springs. Other than that the engine is bone stock.

Don't call and bug JWT about the cams just yet, they are in the very early test stages. The mule is Dave Coleman's new Pro-Rally Spec-V that will make its debut at the upcoming rim of the world rally.

And this:

The balance shafts are good for 7-8 wheel hp on a QR25DE. Surprisingly the affect on NVH is minimal. I drove a QR25 with no balance shafts and it was quite hard to tell, except posibly at idle. Without the shafts the vibration was still better than a KA24DE.

Since the balance shafts spin at twice engine speed, the bearing life on these could become an issue when
the car is raced. So for racing use with a higher than stock redline, There removal might be considered.
 

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X-Mod
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1,585 Posts
autox02altima said:
Some interesting posts from the SE-R mailing list by someone that knows what they're talking about:

Just saw some dyno results from the testing of the lastest QR25 parts.

The car did 175 wheel hp and 174 ft/lbs of torque with the prototype Hotshot header, JWT POP, stock exhaust, removed balance shafts and proto JWT cams and valve springs. Other than that the engine is bone stock.

 
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