Subject: Re: Driving impressions with the AFR heads by anesthes on 2009/8/18 17:26:11
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TonyMamo wrote: No...
That's neither reasonable or remotely possible.
The sportsmans flow barely 230cfm on a good day. The AFR's flow over 280..
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TonyMamo wrote:
A three MPH increase in trap speed in a 3500 pound car requires about 35-40 additional HP. The AFR heads in this test cost the same or less than the ported TFS head he is comparing them to, but even if they were $500 more it would be well worth the money
Stop right there. I don't care how they compare to modified TFS heads. That kind of defeats the purpose of comparing heads.
AFR heads are about $300 more than stock TFS heads, so spending money porting them (TFS) and comparing doesn't make sense. I was hoping he had a AS CAST TFS vs AFR number for me to look at.
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TonyMamo wrote:
You expecting is 119 trap car to see 130 (and mentioning "reasonable in the same sentence)would require an increase of 140 horsepower over a baseline head that costs about the same as the AFR we are comparing it to. All costs aside, I dont think any headswap could ever be expected to produce or achieve those types of results.
Hrmm. For $300 I can justify going from a TFS head to an AFR head, no questions asked. When the difference approaches $500-600, it's a tough sell for 2-3mph.
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TonyMamo wrote: Its all about value and if you determine value based on HP per dollar (which is the only way you should be evaluating it) the AFR's will shine whether your comparing them to a $800 budget set of stock heads or more expensive set from one of our competitors.
I'm looking for some data showing true gains. This isn't a debate over which head is best. This is a debate over should money be spent running the best head, or saved on good heads and put towards a more effective power adder.
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TonyMamo wrote: Lastly, none of the AFR's are as cast....they are all 100%
Eh sorry. I meant more along the lines of "bolt and go". Not messed with, and not paying for extra CNC work. My bad.
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TonyMamo wrote:
Anyway...gotta run but needed to quickly bring this thread back to reality
I don't think it's out of reality Tony. I'm just looking for some proven numbers showing best bang for buck. I like AFR, and if it was somebody else's money I'd play all day. But you know, in reality, money saved on roller cam and best headers can be put towards nitrous or a blower and make twice the power improvement.
So yeah, I guess, I am saying for the money I'd expect the AFR heads to put down 8-10mph increase over a crap head like a sportsman. Which is why I asked if the 119-120mph Josh had was with a fully ported and modified TFS head, or as sold from summit.
