OK I did a blower test on our Superflow engine dyno using a stock 5.3 truck engine with a GT2-3 cam, 90mm T body, de-screened MAF and 1 7/8 long tubes with no cats and I used the same manifold, same water inter cooler, same everything only changing just the supercharger for each test. Each test was pulley matched to produce 10lbs of boost at 6500 rpm and all test were run on VP103 ( 100 oct) gas, 12.0 AFR, and the timing locked at 24 degrees the only difference is just the supercharger and all test were done on the same day. As you can see our little 112 as we all know starts running out of airflow at around 550-600 HP and our 112H does not run out for a other 50-75 HP. I wish I had done this test and matched them all at 6lbs at 4000 RPM because that would have shown both ends of the test and produced totally different results but if you truly have a 10 lb kit this is what you are going to see. I also did this test at 7 lbs on pump gas and had the same results except the 112 did not run out of air. Anyway here is the results for you to look over, like I said this was more of a 6500 rpm test to prove that a given amount of boost at a given rpm from any FI power adder the results will be very similar.
OK here is some more data for each run the plenum is before intercooler and the oil out is after
__________________ http://www.leftcoast32.com
'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger Authorized MagnaCharger Dealer/Distributor
Last edited by 2005SSR6Speed : 08-06-2007 at 11:46 PM.
The biggest thing to take from the data is that it is hard to beat the MagnaCharger boost for boost. The torque on the bottom end is where the 112 shines. These tests were performed on the same dyno with the same engine and all tests were done with the same tune in the same day. It doesn't get any better then that.
__________________ http://www.leftcoast32.com
'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger Authorized MagnaCharger Dealer/Distributor
This is just some patched over data from a test done by a firend. The 5.3 was a healthy one too with the Lingenfelter Cam, De-Screened MAF and 90mm Thottle Body. The test would not be much if any different at comparative boost at the same RPM's with a stock LS2 (although I would not want to pump 10psi into a stock LS2).
__________________ http://www.leftcoast32.com
'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger Authorized MagnaCharger Dealer/Distributor
This is just some patched over data from a test done by a firend. The 5.3 was a healthy one too with the Lingenfelter Cam, De-Screened MAF and 90mm Thottle Body. The test would not be much if any different at comparative boost at the same RPM's with a stock LS2 (although I would not want to pump 10psi into a stock LS2).
Something wrong with 10.9 to 1 compression and 10 psi of boost KA-BANG!
Can't tell from pictures, but were you using the intercooler on tests with the 112 and 112H?
Looks like the 112 makes more power till about 6000 Rpm.
How about a test on the 122H?
Would you expect similar results on the LS2 motor in an 06 model?
Thanks for all of your efforts.
The same intake with intercooler was used for all the tests. The 122H was not used for the test but would be a little lazy on the bottom as compared to the 112 and 112H. You will see similar results on the LS2 with a lower overall boost level at the end because of the higher compression.
__________________ http://www.leftcoast32.com
'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger Authorized MagnaCharger Dealer/Distributor
Nice post, I would love to have a 122H for the LS3 engine I am building or should say Lingenfelter and Shawn but have so much money in the 112 I will use it, I will have to go with a bigger pulley on my 112 and I went with a Lingenfelter GT2-2 cam
Take Care
Joe: This data is a wonderful gold mine, and particularly valuable since it applies to the 03/04 SSR LM4 engine, as the 03/04 models are now available for affordable amounts on the used vehicle market.
One impoprtant question before I even start absorbing it all: Should I be concluding that 10 psi boost is safe on an LM4 with similar cam to that GT2-3 cam and very freeflowing exhaust?
I have limited my boost on my own LM4 to about 9psi so far, because of the cast pistons.
Joe: This data is a wonderful gold mine, and particularly valuable since it applies to the 03/04 SSR LM4 engine, as the 03/04 models are now available for affordable amounts on the used vehicle market.
One impoprtant question before I even start absorbing it all: Should I be concluding that 10 psi boost is safe on an LM4 with similar cam to that GT2-3 cam and very freeflowing exhaust?
I have limited my boost on my own LM4 to about 9psi so far, because of the cast pistons.
Jim G
The engine is the truck version of the 5.3. I will have to see what the difference is in compression. The other thing is that they used 100 octane for this test. I think you are right on track with 9psi on your 5.3.
__________________ http://www.leftcoast32.com
'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger Authorized MagnaCharger Dealer/Distributor
Last edited by 2005SSR6Speed : 08-17-2007 at 09:40 AM.
Joe: The 03/04 SSR does use the same LM4 engine as the "trucks" did, as that was the fast way to get an emissions-certified engine into the SSR when things were so rushed.
The 100 octane fuel is significant in that it would of course delay the onset of detonation, BUT IF you experience no detonation, the questionis really can the stock cast pistons of the LM4 take the heat. Appears the answer might be "yes". This correlates with other data that I posted here recently on a Hot Rod magazine article that showed some very aggressive boost being applied to Chevy and Ford engines with unstrengthened internals.
But, my own SSR is my daily transportation, so I am pretty conservative.
OK I did a blower test on our Superflow engine dyno using a stock 5.3 truck engine with a GT2-3 cam, 90mm T body, de-screened MAF and 1 7/8 long tubes with no cats and I used the same manifold, same water inter cooler, same everything only changing just the supercharger for each test. Each test was pulley matched to produce 10lbs of boost at 6500 rpm and all test were run on VP103 ( 100 oct) gas, 12.0 AFR, and the timing locked at 24 degrees the only difference is just the supercharger and all test were done on the same day. As you can see our little 112 as we all know starts running out of airflow at around 550-600 HP and our 112H does not run out for a other 50-75 HP. I wish I had done this test and matched them all at 6lbs at 4000 RPM because that would have shown both ends of the test and produced totally different results but if you truly have a 10 lb kit this is what you are going to see. I also did this test at 7 lbs on pump gas and had the same results except the 112 did not run out of air. Anyway here is the results for you to look over, like I said this was more of a 6500 rpm test to prove that a given amount of boost at a given rpm from any FI power adder the results will be very similar.
my question is which one would be quicker in the 1/4 mile the 112 or 112H
and which one would you put on an LS2
wow!
(I like the videos wayyyy better!)
SSR 1st Chevy/1st 6spd- Saw it, loved it, bought it. 
there are lots of ways to answer the first one...
