Death to FI. Phase 1

[ringram]

Santa has arrived early. Thanks Brent @ Nook and Tranny..

100% fully custom spec comp cam. (Done with a comp lobe catalog and a bit of DYOR)

My first non off the shelf grind. Not overly adventurous, but should be 20-30rwhp extra. Designed for more top end and grab that extra 3mph at TR and take out the girly stuff that needs FI, cams, methanol, uprated pulley's etc, etc

[ringram]

PS: Wait till you see what Phase 2 is.. (If needed)

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Xpuffin said:

Doesn't matter how sharp the knife is when you're at a gunfight

Already well ahead of a number of FI vxr8's currently sitting at number 3 in the list
We will see how we go next year..

[ringram]

We will see

Its more for me to experiment actually. Ive run 2 cams already in the current engine, this is the third. The difference between the other 2 was quite noticeable.
This current one is broader in power and less peaky. Last one was peaky with more midrange torque.

This one is suppose to be a bit of both and a bit larger too. Not too fussed where I end up, but it will make sure people think about things at least before turning up with an out of the box effort expecting it to perform.

[ringram]

My intake is the restriction..
Maybe a 4500 carb intake is required.
But fitment is a challenge

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Not really a valid test as they changed lift and duration as well as lifters..
Not sure what that tells us except larger cams move power rpm range up..

The cam I have is around 650 lift anyway, Though only a girly 234 duration. However I suspect the intake is going to be pretty well out of huff with that cam at high rpm.

Comp do special low pump HR with about 0.020 hydraulic take up so if they collapse there is no issue. They need longer push rods, but are lighter as well.
They are also DLC coated.

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stevieturbo said:

Brummie revved his pretty high didnt he ?

Was he hydraulic or solid ?

I agree it probably isnt fair test because the CR had a bigger profile. It would have been interesting to do a similar profile, just to see if the SR have better valvetrain stability which would have led to any gains, or if there really isnt any difference between the two

I have seen tests of HR to SR and guess what.. HR is virtually the same except perhaps 2 or 3 bhp which as a % was pretty much zero.
Mainly due to HR vs HT and spring technologies and better lifters etc. Virtually no difference now for street use.

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Gelf VXR said:

Are you using 1.8 rockers?

Yes on the LS7 I am

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neiljohnson said:

What about the Harrop intake like stick has?

Back to back testing by Katech published on corvetteforum show the Fast to out perform the harrop.

Best intake is Carb style.

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A better HR vs SR test http://www.dragzine.com/tech-stories/engine/dyno-s...

If they were same lift Id suggest there would be same power. So HR wins for maintenance reasons IMO.

Of course if you are running 1" of lift etc you dont have much choice and solid is the only option.

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jameshsv said:

Blue383 said:

Do you have a link for that?

That wont please stick if the fazt intake is better than the harrop intake.

Nope

http://www.corvetteforum.com/forums/c6-z06-discuss...

TBH I told Stick he should have got a Fast way back when he was fighting with the Jenvey. But it does tame larger cams.

[ringram]

Yeah he is right.
Both made the same bhp too.
But fast with the longer runners had better low end torque.

Now look at the ls7 v fast.
Ls7 will win up to about 5000rpm

So what's best will depend..

I'm only a messenger too