SuperCharger info

[Race]

I have acquired a Magnuson TPC Supercharger kit for the 986, I believe I have everything except the installation manual. Has anyone recently delt with these installs? or have any documentation on this? I have found a few posts on this subject, but they are old, and all the photos have been removed.

Thank you.

[Starter986]

Originally Posted by Race

I have acquired a Magnuson TPC Supercharger kit for the 986, I believe I have everything except the installation manual. Has anyone recently delt with these installs? or have any documentation on this? I have found a few posts on this subject, but they are old, and all the photos have been removed.

Thank you.

Maybe you've seen this thread? >>>

http://986forum.com/forums/performance-technical-chat/35161-magneson-supercharger-2-5-a.html

I Googled "Magnuson TPC Supercharger kit". First few choices were eBay listings. I then had an idea...

Maybe reach out to a/the seller(s) and ask them if they have install instructions. Worth a shot. Good luck.

In the alternative... keep digging. Good Luck.

[Race]

I have spoken with the seller; they were as helpful as they could be and they were very informative. I knew what I was getting and getting into. These kits are no longer available I believe they did not last due to them being so expensive, that and due to the Boxster being a high compression engine you can only safely run low boost. 4.5 to 5 psi So I am not looking at this being a Ferrari killer. If done correctly I am hoping to gain 40 HP maybe. So, I am trying to get as much information as possible to see if this is even going to be worth it.
Thanks for the reply.

Jeff

[Starter986]

Originally Posted by Race

I have spoken with the seller; they were as helpful as they could be and they were very informative. I knew what I was getting and getting into. These kits are no longer available I believe they did not last due to them being so expensive, that and due to the Boxster being a high compression engine you can only safely run low boost. 4.5 to 5 psi So I am not looking at this being a Ferrari killer. If done correctly I am hoping to gain 40 HP maybe. So, I am trying to get as much information as possible to see if this is even going to be worth it.
Thanks for the reply.

Jeff

Your seller isn't the only seller.

[ike84]

Race, your ultimate power output will depend on several factors. Using bw's calculator, the 2.7 will put out 300hp on a tt setup at 5-6 pounds of boost (theoretically) and have a flat torque curve from 2000 rpm up (depending on exact setup) You sc setup will likely be less of a gain but it will definitely be a real one.

Your issue will be controlling boost. All low pressure systems must be insanely precise. This is far easier of a task to accomplish with a turbo rather than super setup.

Your install should be fairly straightforward if you're familiar with FI systems. Don't forget to swap your spark plugs though - commonly overlooked in builds.

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[The Radium King]

f it is a tpc supercharger then only one seller - tpc (ignore those that have no idea what they are talking about and feel the need to let the world know it).

boost is controlled by pulley size so no variables there unless you modify the kit.

these kits are no longer around for several reasons:

tpc went to turbo kits instead.

the kit located the s/c right by the exhaust and there was a lot of heat soak. this, coupled with no intercooler, resulted in very high IAT and not a lot of power made.

only worked for the 2.5 which had different headers than the 2.7. 3.2, etc.. if you wanted to put the kit on a larger engine you (a) would have to downgrade the exhaust (which robbed power) and (b) the s/c didn't have enough flow to feed the larger engines and in some cases made less power than stock.

fuelling was achieved by adding a 7th injector on the intake manifold driven by a piggyback controller. the 7.2 dme hadn't been broken yet so they took a hack approach to getting it done.

this was one of the first forced induction kits on the market for the 986 and killed quite a few engines due to poor implementation (IAT, fuelling) and didn't give enough power to make the risk worth it. unfortunately, once the internet got ahold of it the mantra became "you can't boost these engines" when the failure was the implementation and not the concept.

in your case (a) make sure you have all the parts. there are a bunch of bespoke bits of ductwork and brackets that are often missing from the kits. and (b) consider going with a custom tune instead of the generic 7th injector and piggyback controller used by tpc. also perhaps a wrap or ceramic coating on the exhaust to limit heat transfer and, if you are handy, an intercooler (but packaging becomes an issue; you'll have to decide air/air or air/water, where to put it, etc.).

[Race]

I have found a few other posts from you on this subject. So, it looks like you have been down this road. and maybe got smart and turned back.
This SC kit is for the 2.5 and I am thinking on putting this on a 3.2. The only issue is of course the exhaust.
I am looking at the left side of the engine, If I remove the airbox and mount the SC up high, this will allow a cooler location and less heat soak. The intake would be right there and allow cooler airflow.
Also, I would be able to follow the same path from the SC exhaust (boost side) that the original intake was using. I am many months away from attempting this project, so any input, suggestions and ideas are appreciated.

[The Radium King]

think about belt routing then and perhaps what you can do without. ie, without a/c or power steering (go electric) you've got more room for the s/c and pulley. also, without a/c you've got condensers for an air/water intercooler ...

also, consider removing the resonance tube and intake plenum and put your air/water intercooler there. no need for a resonance flapper or flow optimization if boosting.

perhaps math out the s/c (it's a 45 iirc?) to see if it can even feed a 3.2 properly. i thought that it should be able to but for some reason it has not performed on the 3.2 in the few limited applications i've read about. i mean, if you are relocating the s/c it becomes pretty much a scratch build anyways so perhaps consider a long snout s/c that might package better.

[Race]

I agree with you on belt routing, I think that is something I will have to figure out once I get started. I like your idea on intercooler location I will look at that. I am trying to figure out the MAPP sensor location and will this affect the ECU I know it will have to be located on the main inlet tube, also I am trying to figure out if I will need to install the 7th injector and brain and how to wire it in?

[The Radium King]

ergh. our cars have a maf and not a map so not certain if they can measure compressed air or not. if not then the sensor has to go upstream of the s/c. and don't think you want to have your 7th injector upstream of the i/c either - the fuel would just condense. again, now that you can find guys that can tune the 7.2 i would just go with bigger injectors as per ike84 and a custom tune.

my final thoughts on packaging before i moved away from it was to clean up the top of the engine (ie, go electric w the p/s, delete the a/c) put on a 996 intake manifold (taller). mount the s/c on top of the engine feeding upwards direct into an i/c mounted between the two intake runners. use the a/c condensers with a small pump and reservoir to cool the charge.

[ike84]

Originally Posted by The Radium King

ergh. our cars have a maf and not a map so not certain if they can measure compressed air or not. if not then the sensor has to go upstream of the s/c. and don't think you want to have your 7th injector upstream of the i/c either - the fuel would just condense. again, now that you can find guys that can tune the 7.2 i would just go with bigger injectors as per ike84 and a custom tune.



my final thoughts on packaging before i moved away from it was to clean up the top of the engine (ie, go electric w the p/s, delete the a/c) put on a 996 intake manifold (taller). mount the s/c on top of the engine feeding upwards direct into an i/c mounted between the two intake runners. use the a/c condensers with a small pump and reservoir to cool the charge.

The map sensors will do the job since they are hot film and have iat built in. It's not as accurate as using a map sensor but the nbo2s will smooth it out.

The stock injectors will also likely be sufficient. Bosch has a chart on flow rates. The prefacelift cars use a one-off injector but Bosch started making them for Porsche in 03. I want to say they're good to 350hp but it's been a long time since I've looked at that.

I would avoid a custom tune and work on a setup that will take a 996 tune. This will require a larger MAF but the ECU will handle at least 15% deviation from baseline maps without issue (ie 350hp). The reason I say that is despite an exhaustive search 2 years ago, I couldn't get ANYONE on the phone in this country who actually knows how to tune me7.2. I'm not saying that as gospel, it was just my experience.

There are workarounds for the tune though. You can retard timing with the clutch sensor under the dash. Rig it to be permanently activated and the ECU will pull timing. Also, you can fool the nbo2 input to the maf by either using variable resistors or by getting a hold of an innovate sc1 to output a custom signal that you can map based on a wbo2 sensor.

The reason I mentioned boost control is exactly what you mentioned trk. I got into the boxster game after the FI fad had died out but from what I read, a lot of conrods met their demise at the end of a 7psi sc setup. They should easily handle power levels of a stock 996 but I would be cautious going much higher than 325 to 350hp (which is conveniently where you'll top out your injectors also). SCs are intrinsically more difficult to control after the design stage of the build than turbos are, but there are a few options out there (vac controlled release valves, for instance) but I have no experience with any of those products to offer.

Also, piggyback injectors are a bit of a mess imo. If I were going to add more injectors, it would be for a wmi setup (more for insurance than performance).

Lastly, trk's suggestion is a very good one - you better put a damn good intercooler setup on this thing. Another shortcoming of the original sc kits. You could redirect the center radiate and dedicate it to a wic setup, or you can mount an air to air intercooler inside the rear bumper (after gutting the stock exhaust and removing that giant shock absorber bar and vent it through the license plate shroud.

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