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Re: Driving impressions with the AFR heads

Subject: Re: Driving impressions with the AFR heads
by anesthes on 2009/8/18 21:07:16

Quote:

BeachBum wrote:

So from Joe's perspective, yes in my opinion, you could see 10 mph swings, but it would have to be an extreme and none

I didn't really expect to see a 10mph swing, but honestly, as a consumer who has always went a cheaper route on heads I was hoping to see a higher split.. HOWEVER....

Quote:

BeachBum wrote:

The test in itself has lost some definitive value due to test conditions and unknowns at the start such as what was

The problem with the test is the numbers are not helpful for the majority of people. How many people do you know that would buy a set of TFS heads, then send them to one of the best porters around to be ported? No way.

And how many people do you know will spend $2k on heads.

Some real tests, for working class people like me would be:

Out of box TFS heads vs AFR with normal ports ($300-400 price split)

RHS vs AFR with normal port ($500-600 price slit)

To say $300 will get you 35hp out of a set of heads, well you might say yeah I'll spend the extra money. But you know, a 150shot kit is like $500, and used s-trims can be had all day for $900-1200.

Quote:

BeachBum wrote:

The one thing I will say, as all true racers will tell you that are et hunting.... we'll take hundredths at a time if thats what is available.... a gain of 1-2 mph on any given day with a bolt-on performance item like a cylinder head is a good day and can literally mean a 15-35 HP gain dependant on how fast you were going in the first place. The guys that race in heads-up series are begging for .1 and .2 mph gains, let alone a full 1-2 mph. It is a defnitive differnce in power to most serious racers.

While that holds true for some pretty serious bracket racers, not using a C4 would probably net the same gain. I mean, if we're talking 1/4 mile cars to begin with.. Put the same motor in a vega with a 9bolt and the thing will go 10mph and a second or more faster.. So to spend a ton of money on different heads when building the wrong car to begin with doesn't make sense either.

For a mean street machine, that doesn't race for points, it's hard to swallow the price difference. no?

-- Joe

VSS