2005 LS6 Magnacharger Build Question
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2004-2007 Cadillac CTS-V Performance Mods Discussion, 2005 LS6 Magnacharger Build Question in Cadillac CTS-V Series Forum - 2004 - 2007; Upon buying my first V two weeks ago, I already have that bug to start modding. My plan is this ...
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    jmsweetv's Avatar
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    2005 LS6 Magnacharger Build Question

    Upon buying my first V two weeks ago, I already have that bug to start modding. My plan is this next winter put the V in the garage and start tearing down for upgrades to rear end working my way forward.

    One of the biggest questions I have is what heads to use with a forged bottom end and a Brute Speed Cam the will compliment a Magnacharger the best? I have read so many post about the stock heads and Maggie being a ineffecient combo because of the higher CR. Most people I talk to say go with LQ9 heads as they flow the same but will lower CR.

    Obviously I am a newbie here and don't know a whole lot. What heads? And what valve springs etc would be best with the Brute Speed blower cam? I don't mind paying a good amount amount on heads if there is something out there that may be what I need/want. Also, would like to have roller rockers.

    My other option which I have been eyeing for some time is maybe a Texas Speed Iron 408 and stay N/A. Worried about the extra weight of the iron block and compatibility to swap into my V. This car will only be street driven and drivability is important. Not worried about mpg. I want torque and lots of it!

    I always try and search first before posting something but I am stumped on this one. Any help would be much appreciated.

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    dedeaux89 is offline Cadillac Owners Fanatic
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    Re: 2005 LS6 Magnacharger Build Question

    http://www.cadillacforums.com/forums...ficiently.html
    This will search better than the forum search tool, Has helped me alot since learning of it a few days ago,
    Also many people here have maggies so when clicking on threads you might see their mods in their signature block, and dyno numbers most of the time so look at their setups to see what you would like for your car,
    As winter gets here and you are starting to get ready to add parts to your car before spending the money, come on here and people might be able to steer you in which direction that might save you some money such as sponser specials, group buys, and holiday sales etc

    You should also take in mind of what your budget is because realistically that is the deciding factor on which route and parts to buy, Many people can't see dumping more than bluebook on an 8 year old car that is now worth 20 grand or less but to each their own,
    If your car is only used on the street, then you probably aren't going to use any of the mods or car to it's full potential anyways so as far as maintaining street manners, I would have to say if your pockets are deep enough then go maggie which will cost you 7 grand probably after a dyno tune etc, more if you don't do the labor. But it will maintain your cars street manners but give you a bunch of giddy up and pedal response.

    All the questions that you have on this matter can be answered by clicking on the faq sticky at the top of the performance mods section, scroll down to forced induction and then you will find all the stuff you want to know which will save people time by not having to restate things that have already been discussed numurous times

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    darkman's Avatar
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    Re: 2005 LS6 Magnacharger Build Question

    I would get cam and head specs from a professional. I used PatrickG (Guerra Group) to spec my cam which came from Geoff Skinner at Engine Power Systems, but can also recommend talking to Mike Schmidt at Total Engine Air Flow (best by phone) or Advance Induction (they are more responsive to emails).

    The key to using stock rockers, as opposed to expensive roller rockers (cheap ones are unreliable), is to stick to cam lifts at or below 0.600 inch (the stock rockers are designed for 0.550 inch) and cam lobes that require 410 pounds or less of open spring pressure. Since blower cams are usually milder than cams for naturally aspirated applications that should not be difficult.

  5. #4
    rand49er's Avatar
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    Re: 2005 LS6 Magnacharger Build Question

    Lots of opinions here, and those opinions change as time goes by. Mine is that you don't have to forge the bottom of your LS6 with a maggie unless you do the overdrive crank pulley and the 2.6" jackshaft pulley all eight-rib where you're well above the 6 psi boost the standard setup gives you ... maybe as high as ~10 psi. At 5-6 psi, do you get torque? Heck yes! Great for street driving. I'm personally not sure what non-OEM heads would do for you with a maggie and whether they'd be worth the expense and effort. You need to drive a simple maggie and OEM head setup and decide if it's enough for you. Gotta be someone there in Hoosier Land who has one and let you experience it. Or, if you come up to Michigan for the Dream Cruise in August, there might be someone who can help you out here. I'll be there only Friday (not Saturday, the official Cruise day) and would be glad to let you try mine. And, as dedeaux89 said, you may want to think in terms of a budget otherwise you'll go poor, and we just love to spend other people's money. Whatever you do, do headers if you can, before or at the same time as a maggie.
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

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    Re: 2005 LS6 Magnacharger Build Question

    The Maggie will be your limiting factor so I'd stop at the cam and overdriven crank pulley. 500 whp is the wall with the 112 so you will just be buying parts that will never reach their efficiency. That's why I go rid of my Maggie and got an E-Force.

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    Quote Originally Posted by DMM
    The Maggie will be your limiting factor so I'd stop at the cam and overdriven crank pulley. 500 whp is the wall with the 112 so you will just be buying parts that will never reach their efficiency. That's why I go rid of my Maggie and got an E-Force.
    Agreed no need to spend extra money when the gains won't be worth it

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    Re: 2005 LS6 Magnacharger Build Question

    Some really good advice and appreciate the feedback. I do like the logic to just run stock bottom and stock heads. I have somewhat deep pockets but my wife has a pretty tight leash...dosen't get the whole "car" thing. I will read more and more. I talked with Bob from Brute Speed and he seems like a really good guy. I guess he has a guy that lives close to me and would be willing to work on my car with me "helping". The biggest satisfaction will be learning this stuff.

    I will indeed plan for the dream cruise to that awful state of Michigan (I am a Buckeye and graduated from Ohio State). And yes RAND49ER I will take you up on your offer. Well, I think for the time being I need to do all the REVSHIFT stuff and maybe some FG2's or K dubs. I have alot of research to do. Hopefully I can meet some of you as time goes along. Sorry I can't contribute much to this forum....maybe someday!!!

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    Re: 2005 LS6 Magnacharger Build Question

    Any response to this post?

    "The LS6 heads are not ok with a Maggie. They will raise compression. Use the truck 6.0 heads and lower the compression some and then you can have a little more boost. There are much better blower cams out there than using a off the shelf LS6 cam. If you are just trying to keep the price down, then use the LS6 cam and go with the truck heads".

    I understand what this guy is saying with the compression being an issue with stock heads. Apparently the LQ9 have a bigger combustion chamber which will lower compression. Then I could use a 2.8 on the maggie and not heat her up to bad.

    I may have more money than sense here..yes atleast I admit it...but lets get crazy a little. I have not yet been able to talk to a reputable shop except Bob @ Brute Speed and we didn't get down to specifics yet just wanted to establish a base with him.

    Until then I'm driving myself crazy from reading post on said topic that usually have different opinions not to mention weeding out whom I think knows there stuff.

    Does anyone feel my pain?????

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    Re: 2005 LS6 Magnacharger Build Question


  11. #10
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    Re: 2005 LS6 Magnacharger Build Question

    I get your drift

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    Re: 2005 LS6 Magnacharger Build Question

    Quote Originally Posted by jmsweetv View Post
    Any response to this post?

    "The LS6 heads are not ok with a Maggie. They will raise compression. Use the truck 6.0 heads and lower the compression some and then you can have a little more boost. There are much better blower cams out there than using a off the shelf LS6 cam. If you are just trying to keep the price down, then use the LS6 cam and go with the truck heads".

    I understand what this guy is saying with the compression being an issue with stock heads. Apparently the LQ9 have a bigger combustion chamber which will lower compression. Then I could use a 2.8 on the maggie and not heat her up to bad.

    I may have more money than sense here..yes atleast I admit it...but lets get crazy a little. I have not yet been able to talk to a reputable shop except Bob @ Brute Speed and we didn't get down to specifics yet just wanted to establish a base with him.

    Until then I'm driving myself crazy from reading post on said topic that usually have different opinions not to mention weeding out whom I think knows there stuff.

    Does anyone feel my pain?????

    Who on Earth is telling you this load of bullshit? While some of the info is theoretically correct, it is totally misapplied to your application. Plain and simple, the Maggie 112 cannot generate enough airflow to necessitate reducing your compression ratio by almost a full point. My TVS 2300 E Force, or Tommy's Whipple, absolutely...no way in hell a Maggie would ever require this unless you had a larger head unit.

    If for some reason you really needed to lower your compression ratio, do it with the cam through dynamic compression (DCR). Another thing to consider is the 243 chamber is MUCH more efficient than the 317's (which are the truck heads you have been ill-advised to install) and you can safely use more ignition advance with the higher compression 243 heads than the 317's b/c of this. If you're dead set on modding and money is burning a hole in your pocket, get a cam and leave the heads alone. You have to decide whether you want lope at idle, something easy or harsh on the valve springs, etc. DO NOT LET ANYONE TALK YOU INTO A GT9 CAM! You will hit your ceiling (power wise) with any cam in the 220/230 duration @ .050" range, with .580"-600" lift, and 116*-120* LSA. Again, the Maggie is the limiting factor here so go with the drivability and level of servicing that you are comfortable with.

    One last thing, the heads (or any other internal engine part) have no bearing on how "hot" the supercharger gets. That is based on the supercharger itself. The harder it works to compress the charge, the hotter the charge will be (pressure/temperature relationship being tied). Bigger/more efficient supercharger = less heating of the charge. The 2.8" pulley came on my Maggie stock, I didn't think it was an upgrade. Did you mean 2.6"?

    Let me edit here before someone calls me on it....more efficient combustion chambers require less timing advance than inefficient ones do, so my saying that "more timing" is not entirely accurate. However, you will make more power with less chance of detonation with a more efficient chamber as chamber design also contributes to the detonation potential. Sorry, my mind goes faster than my stubby little fingers do.

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    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    If you want to help with a hot air charge you would ideally run Method/H2O injection or E85. Or hell do both. But look up some of these guys blower builds. If money isn't an issue for you get an Eforce or another Eaton TVS based unit. Hell even a Whipple twin screw will do lots better than a Maggie. In the laws of engine dynamics... Efficiency is key. The newer generation TVS superchargers are pretty darn efficient... Look up tommy compton's build thread... That thing makes my penis move... Its pretty badass

    Edit: before anyone says E85 doesn't cool the air charge... I know. But it is less prone to predetonation than normal dyno fuel. And you can run more boost with it usually... If you can get enough ethanol in the cylinders.

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    I thought e85 did somewhat cool the charge ... And if money isn't an issue go turbo...

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    RyRidesMotoX is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by Skidmarcx View Post
    I thought e85 did somewhat cool the charge ... And if money isn't an issue go turbo...
    Not really. It is an alcohol based fuel so I guess it does marginally. Water/meth injection is better... You use so much fuel when you are running ethanol (about 30% more in fact) it kind of cools the air charge.

  16. #15
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    Yea that's what I figured it was a slight cooling effect from the extra volume and evaporation... Meth injection like you said would be nice

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