AFR 205 or 225 for Forced induction??? HEY TONY
#1
AFR 205 or 225 for Forced induction??? HEY TONY
Which would be better for a forced induction setup.
Going to go with AFR heads!! Undecided on which to go with either 205,s 66cc or 225,s 62cc-72cc?
I plan on dropping in a set of forged pistons and rods at the same time. I understand that I need to lower my stock comp-ratio as well, for F/I.
Will also be installing a new cam as well GT2-3 571/578-118.5 (have and ready to install)
Would it be better to go with the larger CC or smaller piston?
Which head is more suited for F/I. I am leaning towards the 225,s.
Lets hear some thought on this please.
HEY TONY@AFR you out there......Fill me in.
Going to go with AFR heads!! Undecided on which to go with either 205,s 66cc or 225,s 62cc-72cc?
I plan on dropping in a set of forged pistons and rods at the same time. I understand that I need to lower my stock comp-ratio as well, for F/I.
Will also be installing a new cam as well GT2-3 571/578-118.5 (have and ready to install)
Would it be better to go with the larger CC or smaller piston?
Which head is more suited for F/I. I am leaning towards the 225,s.
Lets hear some thought on this please.
HEY TONY@AFR you out there......Fill me in.
#3
Originally Posted by 8KickassRS9
72's with flat tops and the runner size depends on power goal gl man
#4
TECH Veteran
iTrader: (12)
Join Date: Dec 2004
Location: Rockville, MD
Posts: 4,354
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 618HAWK
As for power goal currently @ 540hp & 533tq. Would like to make more, which we all want. " The more the better" But I want to keep the the torque up thers as well.
#6
My response will be similar to other threads debating the 205/225 situation. This is aimed at stock displacement engines (not strokers...)
For a killer street piece still capable of 600 RWHP or so (and loads of low/midrange grunt), the 205's are the ticket.
For a higher HP race oriented set-up with lots of boost, the 225's will certainly shine....they also come with a larger chamber which might help you dial in the right compression ratio based on various piston choice.
Can't go wrong with either, but my advice is to really think about what you want and where your priorities lie. Really its a matter of how aggressive a build you are looking for....
Tony M.
PS....Once you cross the 400 CID mark, unless you were looking for tractor like low RPM torque, the 225's would be the head of choice in both street and strip applications.
For a killer street piece still capable of 600 RWHP or so (and loads of low/midrange grunt), the 205's are the ticket.
For a higher HP race oriented set-up with lots of boost, the 225's will certainly shine....they also come with a larger chamber which might help you dial in the right compression ratio based on various piston choice.
Can't go wrong with either, but my advice is to really think about what you want and where your priorities lie. Really its a matter of how aggressive a build you are looking for....
Tony M.
PS....Once you cross the 400 CID mark, unless you were looking for tractor like low RPM torque, the 225's would be the head of choice in both street and strip applications.
#7
Thanks Tony.
Well I am not after a race oriented setup. Would like to be well over 600 hp some where close on the torque as well. Like you say "low and mid range grunt", is what I am after. With a good streetable driver.
So I take it the 205,s would put me there and if I were to go with 225,s would be even better. But put me more into a race oriented set up with the option to make more if needed. And give me lots of low end grunt. And still be a good streetable driver.
I cant see pushing more than 12-13 psi of boost. So would the 225 be to better for this condition? And give me the option for more if needed down the road.
Chris
Well I am not after a race oriented setup. Would like to be well over 600 hp some where close on the torque as well. Like you say "low and mid range grunt", is what I am after. With a good streetable driver.
So I take it the 205,s would put me there and if I were to go with 225,s would be even better. But put me more into a race oriented set up with the option to make more if needed. And give me lots of low end grunt. And still be a good streetable driver.
I cant see pushing more than 12-13 psi of boost. So would the 225 be to better for this condition? And give me the option for more if needed down the road.
Chris
Trending Topics
#8
TECH Veteran
iTrader: (12)
Join Date: Dec 2004
Location: Rockville, MD
Posts: 4,354
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 618HAWK
Thanks Tony.
Well I am not after a race oriented setup. Would like to be well over 600 hp some where close on the torque as well. Like you say "low and mid range grunt", is what I am after. With a good streetable driver.
So I take it the 205,s would put me there and if I were to go with 225,s would be even better. But put me more into a race oriented set up with the option to make more if needed. And give me lots of low end grunt. And still be a good streetable driver.
I cant see pushing more than 12-13 psi of boost. So would the 225 be to better for this condition? And give me the option for more if needed down the road.
Chris
Well I am not after a race oriented setup. Would like to be well over 600 hp some where close on the torque as well. Like you say "low and mid range grunt", is what I am after. With a good streetable driver.
So I take it the 205,s would put me there and if I were to go with 225,s would be even better. But put me more into a race oriented set up with the option to make more if needed. And give me lots of low end grunt. And still be a good streetable driver.
I cant see pushing more than 12-13 psi of boost. So would the 225 be to better for this condition? And give me the option for more if needed down the road.
Chris
#9
Originally Posted by 8KickassRS9
the thing is 12-13 psi on the 225's is gonna be different because well.. ur gonna be pushing more air in those runners to reach that psi.
Chris
#11
Collections Hold
iTrader: (1)
Join Date: Jun 2004
Location: howell mi
Posts: 476
Likes: 0
Received 0 Likes
on
0 Posts
heads
I would reccommend the 225's you may lose actual boost pressure, but flowing the same amount of air. anytime you can flow the same amount of air at a lower psi, the result will be more horsepower. you have less drag on the crankshaft, less load on the internals of the blower, resulting in lower intake air temps. a 225 cc runner is not a "big" port. Good Luck!!
#12
Tony,
Did you do back to back comparisons of the 205 vs. 225 on street and track cars to form your opinion? I can understand why the 205 would give crisper response, but neither seems over the top in flow for any LS1 displacement. And both seem like they would be challenged in really big (say over 441) engines.
David
Did you do back to back comparisons of the 205 vs. 225 on street and track cars to form your opinion? I can understand why the 205 would give crisper response, but neither seems over the top in flow for any LS1 displacement. And both seem like they would be challenged in really big (say over 441) engines.
David
#13
TECH Senior Member
iTrader: (7)
Originally Posted by cary et performance
I would reccommend the 225's you may lose actual boost pressure, but flowing the same amount of air. anytime you can flow the same amount of air at a lower psi, the result will be more horsepower. you have less drag on the crankshaft, less load on the internals of the blower, resulting in lower intake air temps. a 225 cc runner is not a "big" port. Good Luck!!
#14
10 Second Club
iTrader: (47)
Join Date: Nov 2001
Location: Pace, FL
Posts: 1,453
Likes: 0
Received 0 Likes
on
0 Posts
We did a car at the shop that was an 02 Z06, forged short block, AFR 205 right out of the box, 224/228 cam, ls6 intake, A&A P1SC setup, 8 lbs of boost, with 160 miles on the motor that did 644 rwhp and a VERY conservative tune! The car has power everywhere and I think the 205 head is Awesome! He is in Kuwait right now, but when he gets home we are retuning on 10.5 lbs and a much more aggressive tune! Gonna have some killer AFR 205 numbers posted up!
#15
Originally Posted by John02SS
We did a car at the shop that was an 02 Z06, forged short block, AFR 205 right out of the box, 224/228 cam, ls6 intake, A&A P1SC setup, 8 lbs of boost, with 160 miles on the motor that did 644 rwhp and a VERY conservative tune! The car has power everywhere and I think the 205 head is Awesome! He is in Kuwait right now, but when he gets home we are retuning on 10.5 lbs and a much more aggressive tune! Gonna have some killer AFR 205 numbers posted up!
Those are killer numbers and your right about the 205 being a very effective piece. Certainly with a blower (and considering the request to "grow" down the road), I would advise a 225 in this particular application but don't dismiss a 205 if you are wanting a more rounded street package still capable of laying down a number. A centifugal style blower doesn't make a lot of boost or move alot of air at lower RPM's, hence my comment about possibly going with 205's if you were searching for "big block" type torque lower in the power band. The 225 will obviously offer slightly more horsepower potential and on a larger displacement build makes the choice a no brainer, especially if that laregr displacement includes a 4" or greater bore diameter (where the 225 head really shines).
I don't have any blown A-B tests regarding both 205's and 225's but I will be sharing some results on a naturally aspirated 383 in the following few weeks...
Thanks,
Tony M.