Here’s an interesting post from Arin@APR. Anyone want to confirm it? He is speaking about jones2012S4. Seems the mystery mod was an overdrive crank pulley that drives the blower harder, especially in tandem with the smaller supercharger pulley. JHM is making one of these, but jones I think said he didn’t have a JHM part. Since the cat is out of the bag, it would be helpful if we could know the actual part on the car so I can correct the list.
[quote=Arin@APR]Since it has come to this, it’s worth mentioning the best factory supercharger record was conducted in great conditions with both a supercharger pulley and a crank pulley with 116 octane fuel. Setting records with those modifications are obvious.
Cold, dense air = excellent for power on a supercharged application. This is why our platform is dramatically faster in the winter.
Spinning the blower faster than everyone else = recipe for making more power, especially for a single pull. This is why all records are with at least a pulley upgrade.
[/quote]
It should be noted that jeff had MS109 which is 105 octane…Arin got that wrong.
Another thing Arin got wrong was attempting to discount Jeff’s time because he was ‘spinning the blower faster than everyone else’. How the fuck is that a negative lol. That’s like saying 'sure stage 2 beat stage 1, but it was spinning the blower fast. no shit it was.
The truth is that with jeff’s dual pulley setup, if safe for the 1320, it blows a GIGANTIC hole in the viability of the 1740 kit, and it’s probably $500 rather than $10,000. So you can understand why he/APR are trying to discount his success.
If someone could post up the warranty RPMs the 1320 is good for, and anyone’s experience on other platforms for a safe RPM to spin it, it would be really interesting to see if this is a strategy everyone should be following.
questions
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would the existing stage 2 tunes accomodate this dual pulley level of boost, or would they bleed off boost (i.e. they set boost request beyond what stage 2 (one pulley) can do, but is it enough headroom for stage 2+ (the double pulley)? If not you’d need a custom tune. Does jeff have a custom GIAC tune?
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are the current stage 2 supercharger pulleys sized where they are because they’re at the limit of their ability to hold the belt without slip, or because this is the limit of safe RPMs for the TVS1320? If the former, the overdrive crank is a great option. If the latter, not so great.
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does auditude have the overdrive crank on his dad’s car yet ? If not, when?
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conversely, does primetime? Will be interesting to see if primetime does so because it would kill APR to see an APR stage 2+ car within a tenth or two of the stage 3 kit. If APR/Magnuson keeps fucking him around, I reckon we’ll see him go the stage 2+ route 
Nobody (with any common sense) is going to pay $10,000 for 2 mph. If you understand how cars work…and the stage 2+ setup is safe for the 1320, why on earth would you entertain the stage 3 kit? Sure the guy with the green hulk SQ5 will buy it because he’s clueless, but seriously knowing what we know today, and if it checks out as safe for the 1320 who could buy a stage 3 kit now?
