MP112 cam?
MP112 cam? Which one of these cams would best suit a Magnacharger MP112? 226/234|.60x"/.61x"|LSA115+3
or
234/240|.61x"/.61x"|LSA115+5?
This will be on a 98 T/A with LS1.
Thanks in advance!
or
234/240|.61x"/.61x"|LSA115+5?
This will be on a 98 T/A with LS1.
Thanks in advance!
I've actually made some changes to the blower cams for 2013, but for a 112 I'd go with the smaller stage one.
Lol, yeah I bet they do. What kind of idle can I expect with the stage 1 cam? I know I cant have a hard hitting cam, but I would like some kind of chop to it. Would this cam do that for me? I also figured that it would help out a little up top when the MP112 starts to run out of steam.
Those are both way off!!! Anything more then 224 is just working against you, and the rotors will be slapping at idle like no other. LS6, GT2-3, and in the 220-224 range if you want a little chop too it. The GT2-3 and maggy 112 combos are the absolute fastest at the track. The 122s seem to work great with up to a 224 cam.
Lol, yeah I bet they do. What kind of idle can I expect with the stage 1 cam? I know I cant have a hard hitting cam, but I would like some kind of chop to it. Would this cam do that for me? I also figured that it would help out a little up top when the MP112 starts to run out of steam.
They're shelf cams and were really more so intended for a centrifugal blower and are not 100% optimal for every single combination, but the Stage One will work fine. We've dyno'd plenty of MP112's, TVS 1900's and 2300's here(I know those last two blowers are bigger than a 112) with similar cams to the Stage One and they make very nice power with a great torque curve.
I like to maximize the valve events on a positive displacement blower while keeping overlap to a minimum so that the smaller blower doesn't have it's tongue hanging out trying to work against a bunch of overlap. This has given me the best results. We've got a G8 on the rollers right now with another positive displacement blower cam I did that replaced a GT9 and it will be interesting to see what kind of power it makes.
Dave you know just as well as I do that you can have two cams, one with 224/224 112 lsa and another with 230/230 115lsa and both have the same amount of overlap. Overlap is the enemy on a small blower combination which is what I think you were trying to say by using a smaller amount of duration, at least I think you were?
That said if would of asked me if I'd like to see something different I'd say a cam with more exhaust duration with a small positive displacement blower to help shift some of that massive low end torque production up top and taking some intake duration away would be a start. I have two positive displacement specific blower cams that would probably be a better overall fit, but they won't give you the idle you're looking for OP. The one that I would recommend is 222/240 .59X"/.58X" 118+4.
Last edited by Sales@Tick; Jan 8, 2013 at 08:41 AM.
My goal for my car is 500HP, with a noticable idle, but I cant figure out which cam would help me get what I want. I figure a MP112 with I think a 2.9 pully, kooks 7/8 headers and 3" true duals would get me close.
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Verdad Gallardo To not be detrimental to such a small blower I'd push to keep the overlap at 0 degrees or less.
Here is the idle clip of that G8 with my custom blower cam that is very similar to the 222/240 118+4 cam I listed above:
This car has true duals and no cats. This cam has -3.5 degrees overlap so adding 3.5 degrees overlap to this cam would give you a more noticeable lopey idle, but still nothing crazy.
Here is the idle clip of that G8 with my custom blower cam that is very similar to the 222/240 118+4 cam I listed above:
This car has true duals and no cats. This cam has -3.5 degrees overlap so adding 3.5 degrees overlap to this cam would give you a more noticeable lopey idle, but still nothing crazy.
It is very mild as far as the cam and overlap are concerned, but it maximizes the lobe intensity that can be utilized and the actual valve events. The intake valve close event and exhaust valve open event if looked at by themselves, look like they would belong to a cam much larger and aggressive than this one.
Not really the Maggy just moves a lot of heat up there, maybe if it had a 3.6" blower pulley. It comes down to blower speed and making the whole package work together. With more cubes then the 112 wants you end up with a pile of torque and not a whole lot of RPM.
My JY 5.3l MP112 combo made 500rwhp with a 224 on 114lsa cam, 3.0 pulley and 90mm TB at 6000rpm. It pulled pretty smooth to 6500 too. This was through Camaro manifolds and a 4l80e unlocked. the reason it pulled good to 6500 was more then likely the fact that I was running E85. On pump gas it made 455rwhp and did not like the high shift point at the track.
My JY 5.3l MP112 combo made 500rwhp with a 224 on 114lsa cam, 3.0 pulley and 90mm TB at 6000rpm. It pulled pretty smooth to 6500 too. This was through Camaro manifolds and a 4l80e unlocked. the reason it pulled good to 6500 was more then likely the fact that I was running E85. On pump gas it made 455rwhp and did not like the high shift point at the track.
Not really the Maggy just moves a lot of heat up there, maybe if it had a 3.6" blower pulley. It comes down to blower speed and making the whole package work together. With more cubes then the 112 wants you end up with a pile of torque and not a whole lot of RPM.
My JY 5.3l MP112 combo made 500rwhp with a 224 on 114lsa cam, 3.0 pulley and 90mm TB at 6000rpm. It pulled pretty smooth to 6500 too. This was through Camaro manifolds and a 4l80e unlocked. the reason it pulled good to 6500 was more then likely the fact that I was running E85. On pump gas it made 455rwhp and did not like the high shift point at the track.
My JY 5.3l MP112 combo made 500rwhp with a 224 on 114lsa cam, 3.0 pulley and 90mm TB at 6000rpm. It pulled pretty smooth to 6500 too. This was through Camaro manifolds and a 4l80e unlocked. the reason it pulled good to 6500 was more then likely the fact that I was running E85. On pump gas it made 455rwhp and did not like the high shift point at the track.
I have found a remedy (at least I think I have it's worked so far) to the "lot's of torque not a whole lot of rpm" deal that seems to plague these smaller blowers and that's minimize overlap, and maximize the intake valve close event and the exhaust valve open event. Shift all that low end torque with cam timing up top. Tooley does things very similarly with his positive displacement blower cams also.
Keeping the cam small reduces overlap, same thing I am saying. Keep overlap to a minimum and it will keep the blower from working harder than it has to, and harder than it already is.
If you make it so small though, that it has a really early IVC and it's going to peak at 5500rpm and you're in the same boat as putting it on too large of an engine. A bunch of torque and no top end. Stretch those events out to a later IVC and an earlier EVO to shift the torque curve up top while keeping overlap in the same range a 224/224 114 cam would be in and you get the best of both worlds.
This is just my opinion and what I have found through the data I've received and cams I have done that's all.
If you make it so small though, that it has a really early IVC and it's going to peak at 5500rpm and you're in the same boat as putting it on too large of an engine. A bunch of torque and no top end. Stretch those events out to a later IVC and an earlier EVO to shift the torque curve up top while keeping overlap in the same range a 224/224 114 cam would be in and you get the best of both worlds.
This is just my opinion and what I have found through the data I've received and cams I have done that's all.
So having any kind of noticable idle is out of the question right? There is just no room for sacrafice with this blower. So what would help me reach my goal of a 500hp street car with the best range of power through the rpm's. The gt2-3 seems to be the proven contender, but I like what Martin is trying to achieve with the cam he has described. By widening the power band I guess you could say. I am no cam expert by no means, so which would help me the best at my goal?
I agree with you Martin, sort of what GM and LPE do with there positive displacement blower cams. My 224 cam was not ideal but it was in there and better then the stocker.
You can have some chop even with only 220* and some negative overlap. My 224 cam checked in with -4 but all you have to do is pull the timing at idle and she will chop.
You can have some chop even with only 220* and some negative overlap. My 224 cam checked in with -4 but all you have to do is pull the timing at idle and she will chop.