Cam Question
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 848
Likes: 8
From: St. Louis Mo.
Cam Question
I currently have a G5X-3 cam, but would like to switch to a
226/234 .598 .599 117lsa What would be the power difference
between the two and would my tune for the G5X-3 be close enough that i'd be able to drive it untill/and or go for a dyno tune? Current setup 441rw/404tq on an '05 A4 with AFR 225's and LG longtubes(LS2 Edit
)
226/234 .598 .599 117lsa What would be the power difference
between the two and would my tune for the G5X-3 be close enough that i'd be able to drive it untill/and or go for a dyno tune? Current setup 441rw/404tq on an '05 A4 with AFR 225's and LG longtubes(LS2 Edit
)
Last edited by RWSjr; Mar 17, 2007 at 01:36 PM.
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
Few of us know the specs on the G5X-3 cam to be able to compare it to the proposed new cam.
The new cam has a pretty wide LSA, typically what one might see with a duration at 220 degrees or less.
Why are you contemplating switching to the new cam? What are your goals?
The new cam has a pretty wide LSA, typically what one might see with a duration at 220 degrees or less.
Why are you contemplating switching to the new cam? What are your goals?
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 848
Likes: 8
From: St. Louis Mo.
Goals are #1 make it a better setup for F.I. #2 the side effect is less lope,better manners. It may not be the cam of choice for TT, but an APS system is not designed for the F55 cars.(have to relocate sensor linkage). So,a Maggie(probably) or a centri(not convinced yet) In the meantime i'll enjoy a smoother idle.
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
OK, understood. This is probably a better choice for the Maggie as compared to a centifugal blower. The Maggie will tame down the lope at idle. It will still sound nasty, but will idle at a lower RPM, and your throttle response will not suffer. The reason is that reversion is reduced. Reversion is when exhaust gasses contaminate the intake charge during the overap period, when both valves are open at the same time. WIth the Maggie, even at idle the intake charge enters the combustion chamber under pressure, so the exhaust gases are kept out.
The wider LSA reduces overlap, so it also has a beneficial effect on idle. However, I still think that the 117 LSA is more than you need for the Maggie. A 114 would do just fine, does not require a custom grind, and you will still have a nice idle and good street manners.
This same cam on a centrifugal blower would not have as great throttle response or low-RPM TQ. The peak HP would be much higher than the Maggie though. The Maggie will only flow a limited amount of air due to the small size (displacement) of the blower case.
The wider LSA reduces overlap, so it also has a beneficial effect on idle. However, I still think that the 117 LSA is more than you need for the Maggie. A 114 would do just fine, does not require a custom grind, and you will still have a nice idle and good street manners.
This same cam on a centrifugal blower would not have as great throttle response or low-RPM TQ. The peak HP would be much higher than the Maggie though. The Maggie will only flow a limited amount of air due to the small size (displacement) of the blower case.
Drifting
Joined: Oct 2005
Posts: 1,549
Likes: 1
From: Roanoke Virginia
LG G5X3 234/242 .600/.610 112 LSA
Pro
Joined: Jan 2006
Posts: 645
Likes: 0
From: Toronto Ontario
My G5X1 is similiar to what you want...spoke to Anthony at LGM and he suggested this was a very well behaved street cam w/ noticeable lope.
I originally wanted to go bigger, but the practical side of me won out.
(G5X1 228/232 .588/.574 LSA 112)
I am quite happy with it.
Dynoed @ 410 RWHP and 398 RWTQ when car was still running kinda rough...wanna re dyno to see #'s since its running alot better now.
I originally wanted to go bigger, but the practical side of me won out.
(G5X1 228/232 .588/.574 LSA 112)
I am quite happy with it.
Dynoed @ 410 RWHP and 398 RWTQ when car was still running kinda rough...wanna re dyno to see #'s since its running alot better now.
Last edited by Rizzo da Rat; Mar 20, 2007 at 12:36 AM.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
The tune will be fine but why bother swapping the cam?? If you are doing FI, either rebuild the bottom end or bag the whole idea. I can't see why people do this. You can run only minimal boost on the stock bottom end. You are leaving tons of HP on the table. Do it right or don't do it at all. 
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Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
You can easily run all the boost that a Maggie is capable of producing w/ the stock bottom end. All the power will be made below the existing redline.
If you go with a centrifugal blower or a turbo at high boost, say over 15 psi, that's another story.
If you go with a centrifugal blower or a turbo at high boost, say over 15 psi, that's another story.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
I have a 20 year old car that handles 28 psi, or 800HP with a stock bottom end. Difference being, tha tit was biult for boost, the Vette is not.
If you are going to run boost, run boost. 8 pounds, thats cute
Le Mans Master
Joined: Jul 2005
Posts: 5,328
Likes: 405
OK, understood. This is probably a better choice for the Maggie as compared to a centifugal blower. The Maggie will tame down the lope at idle. It will still sound nasty, but will idle at a lower RPM, and your throttle response will not suffer. The reason is that reversion is reduced. Reversion is when exhaust gasses contaminate the intake charge during the overap period, when both valves are open at the same time. WIth the Maggie, even at idle the intake charge enters the combustion chamber under pressure, so the exhaust gases are kept out.
http://www.magnusonproducts.com/mp112.htm
Therefore, it won't tame the lope at idle at all nor will it idle at a lower RPM or reduce reversion. The intake charge enters the cylinder at idle under vacuum just like a NA engine with nothing preventing exhaust gases from reversing flow and diluting the incoming charge.
Originally Posted by HITMAN99
The wider LSA reduces overlap, so it also has a beneficial effect on idle. However, I still think that the 117 LSA is more than you need for the Maggie. A 114 would do just fine, does not require a custom grind, and you will still have a nice idle and good street manners.
Originally Posted by HITMAN99
This same cam on a centrifugal blower would not have as great throttle response or low-RPM TQ. The peak HP would be much higher than the Maggie though. The Maggie will only flow a limited amount of air due to the small size (displacement) of the blower case.
