574whp Stock block 92 octane 3586
Thread Starter
Joined: Jan 2004
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From: Northwest
The most we have personally got out of a Red as of now is 544whp at 31psi. We arent trying to push that one too much past that though as it is a circuit car and the idea was longevity more than peak power. That car is a built version of my current setup with a ported head (IX at that), Red, and E85. If we went for all out I think it might be able to make more but I am not sure how much.
Alright. I wouuld really like to get 650 hp with my car. i am in the process of building a 2L. im not sure what turbo to get tho to get to my goal. I just like the spool up on the Red.
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Thread Starter
Joined: Jan 2004
Posts: 11,406
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From: Northwest
I have also been racing my 1G auto alot lately so the Evo has been a dyno queen for a bit but I'll take it back out before the built motor goes in.
I am not going to go into all the specifics of where and why I think rod bolts fail, but I think 400 ft lbs is not their failure point. It seems its a little higher and typically its because cars are tuned with a big spike in mind which generates tremendous cylinder pressure at low rpm/high load (think stalling force). High revving engines with lower torque survive longer because the load is more gradually applied. I liken it to nitrous shock in a motor, the sudden increase in cylinder pressure can take rod material to the limits of its strength, hit elasticity, then fail. In addition to this is the "normal" tune approach that assumes timing is the most important thing we can do for power and not keeping in mind the direct relation to cylinder pressure.
Keeping a rod from folding by keeping peak cylinder pressure lower has been something that has proven to work very well. It's always seemed that RPM has lead to most stock fastener failures though.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
You feel that cylinder pressure is going to be the likely source of failure of rod bolts compared to engine speed?
Keeping a rod from folding by keeping peak cylinder pressure lower has been something that has proven to work very well. It's always seemed that RPM has lead to most stock fastener failures though.
Keeping a rod from folding by keeping peak cylinder pressure lower has been something that has proven to work very well. It's always seemed that RPM has lead to most stock fastener failures though.
Rod bolts don't fail from compressive loads, like cylinder pressure.
They fail from the force of high rpm during the portion of the stroke when that force is unopposed by cylinder pressure.
They fail from the force of high rpm during the portion of the stroke when that force is unopposed by cylinder pressure.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
I dyno'd one of our customers cars with the exact same setup, albeit with a built bottom end and ported head. The car is an VIII to my IX but came up with the same exact power numbers when it hit the wall on 92 octane. Jesse' made 574 and went on to make 576. The car also runs 131mph. Once its caged Jesse can get a little more comfortable with it and run better than an 11.4.
