AFR 205s or 235's on a FI GTO
11-02-2009, 04:06 PM
#1
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AFR 205s or 235's on a FI GTO A buddy of mine has a maggie GTO 04. Right now he has a chance on a pretty good deal for a complete set of AFR 205's. Is it worth it since he is FI or should he spend the extra money and get 235's.
Thanks in advance.
Thanks in advance.
11-02-2009, 06:44 PM
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Well he is getting a deal, if he buys the AFR heads he gets a ls6 shortblock for free. And with that the plan would be a 396 stroker. The goal isn't anything crazy like 800hp. Just to go 10's in a street car. Boost will most likely be around 10psi. with a small blower cam. Just needed to know if the 205's would still be a good choice.
Thanks though, any more imput is appreciated.
Thanks though, any more imput is appreciated.
11-02-2009, 10:45 PM
#5
Depends on what kind of blower your friend is running, and how he drives this car. If he's running a roots style blower, the blower makes linear boost, and power on the low end will not be compromised too much with the larger heads. On the other hand, a centrifugal that makes more and more boost as the engine speed increases but is softer on the bottom end would benefit from the velocity of the 205, and would still support enough flow up top to get the job done.
If this is more racecar than anything, do wahtever makes the most power from 4,000 - 7,000 rpms and let the gearing/converter put it in the correct powerband. The more street driving is done with the vehicle, the more the compromises mean to the manners of the car.
If this is more racecar than anything, do wahtever makes the most power from 4,000 - 7,000 rpms and let the gearing/converter put it in the correct powerband. The more street driving is done with the vehicle, the more the compromises mean to the manners of the car.
11-02-2009, 10:48 PM
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Depends on what kind of blower your friend is running, and how he drives this car. If he's running a roots style blower, the blower makes linear boost, and power on the low end will not be compromised too much with the larger heads. On the other hand, a centrifugal that makes more and more boost as the engine speed increases but is softer on the bottom end would benefit from the velocity of the 205, and would still support enough flow up top to get the job done.
If this is more racecar than anything, do wahtever makes the most power from 4,000 - 7,000 rpms and let the gearing/converter put it in the correct powerband. The more street driving is done with the vehicle, the more the compromises mean to the manners of the car.
If this is more racecar than anything, do wahtever makes the most power from 4,000 - 7,000 rpms and let the gearing/converter put it in the correct powerband. The more street driving is done with the vehicle, the more the compromises mean to the manners of the car.
11-02-2009, 11:21 PM
#7
AFR 205's on ~400ci engines have made some great numbers N/A, and there is no reason to think that they could not support the necessary power levels to reach your goals with boost. Erring on the conservative side should net a better driving street car.
On the plus side, you really can't go wrong with either one, they will just change the driving dynamics somewhat.
On the plus side, you really can't go wrong with either one, they will just change the driving dynamics somewhat.
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11-03-2009, 08:04 PM
#10
As an extreme example, I bet the guys making serious power FI are not running stock castings and letting the blower do all the work. If the budget allows for it, why not?
11-03-2009, 09:01 PM
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Well the deal he's getting is if he buys the complete set of heads, he get's a complete ls6 shortblock in perfect condition for free. The plan would be to re-use the ls6 crank forge the rods/pistons, use the new heads and take the maggie off the current ls1 that's in the goat and try to make around 550whp.
11-04-2009, 06:10 PM
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Engines that are FI still need good heads the boost is going to force the air into the cylinders but the heads still need to flow on the exhaust side to get rid of the wast. So to get the most out of a FI engine you need to look more at your exhaust flow numbers they are what count.
