Subject: Re: Driving impressions with the AFR heads by anesthes on 2009/8/18 20:59:57
Quote:
TonyMamo wrote:
First of all your comparing two different cars....Josh doesn't run a Sportsman head....he has baselined and documented this test extensively (if you care to read thru it) with a different head entirely. I suggest you take the time to go over the pertinent information.
And the fact you would expect ANY head to give you the increase you are suggesting (8-10 MPH trap speeds) after having the chance to read what that would actually entail tells me you don't really spend much time at the track or building/dyno testing engines to truly appreciate the huge gains you are carelessly throwing around.
If Josh does pick up 2-3 MPH in trap speed that IS a significant gain and once you've been to the track a few times and have changed combinations and spent money to increase your performance, you will have a better appreciation of whats really needed to accomplish this.
I dont want to argue with you Joe but Im confident others on this board that have more track experience will back me in what I am saying....picking up just a few MPH in your trap speeds is easily noticeable in the SOTP and requires a good deal of HP to accomplish that. An 8-10 MPH increase in trap speeds isn't in the realm of any headswap....period.
-Tony
Tony,
First off. I'm not trying to argue with you. I didn't call you out in the thread.
Secondly, I have built plenty of motors and spent years at the track.. I've never ever ever seen a set of heads give an 8-10 mph increase in trap speed, but I've never tried AFR heads.
What I was doing was, looking for realistic cost comparison. You and BeachBum both summed up what I wanted to hear.
Basically, what your getting at is that by spending hundreds of more dollars on a superior head, I could expect to pick up something between 2-3mph on my trap speed. In Josh's case, he's running a comp port 195 which retails for $2000, almost twice as much as a 'out of the box' TFS head.
And the difference between a $1100 TFS head, a $900 RHS head, and a $2000 AFR head might be 25hp ?
So, dollar for dollar, a budget builder would be miles ahead saving the $1000, and putting it towards a used blower or new nitrous kit to get a 150+hp increase.
Let me put it in more simple terms.
Say my 412 for example, at around 10.4:1 with el cheapo TFS or RHS heads, will trap 125mph.
Using a pair of AFR elims (10.2:1 compression) with comp ports, might trap 128mph?
El cheapo TFS or RHS with $1200 S-trim might trap 130+..
