Sprintex 335 Testing & Progress

[SprintexUSA]

Just remember when you go for 22psi+, that things get a little hot in there.

[Kodename47]

Originally Posted by smudge

Hmmm....

My limiter is set to 7650rpm I think...that extra 650rpm shouldn't be an issue really...should it?

My limiter gets lower by gear on my 70mm. Its still limited to 7200 in 1st and 2nd down to 7k from 4th onward.

[smudge]

Originally Posted by SprintexUSA

Just remember when you go for 22psi+, that things get a little hot in there.

Yep, our biggest concern which we'll address as we go with the big wager pump I'm waiting for Moto-East to release and possibly some meth injection at some point

[SprintexUSA]

I'd relocate the battery to the trunk and put a water reservoir tank in its place

[smudge]

Originally Posted by SprintexUSA

I'd relocate the battery to the trunk and put a water reservoir tank in its place

That's something else we've considered as well

[350matt]

so how much boost does this blower make at a 'safe' rpm so not whizzing it up past 15K rpm? and what IAT does it produce when at this boost?

[SprintexUSA]

If you have been around the block with Subaru turbos, you know the significance of 18psi. That's where the 335 is a happy medium. That pressure is not too-too much, but is a healthy amount of air that does not stress the compressor nor needlessly run up the IATs. Further airflow mods would be worth more than turning up the boost higher on a stock block.

[350matt]

so it makes 18psi of boost then? at what compressor rpm? and with what IAT?

[SprintexUSA]

The 335 on this motor will do 24psi, but there is currently no real point in pushing it that hard. 18psi is about 10,000rpm on the blower with IATs about 80F over ambient, before the intercooler.

You can "turn the boost up" past 18psi on the 335, but there's no more power to be had currently. It just drives up IATs. That means there is a restriction in the system.

I'd start with the headers because it's a fix you can fab more easily. A bigger throttlebody (or multiples) is going to take time, money, and a tuner who's crazy enough.

[sam69]

What size pulley is that running

[stockysnail]

Originally Posted by SprintexUSA

The 335 on this motor will do 24psi, but there is currently no real point in pushing it that hard. 18psi is about 10,000rpm on the blower with IATs about 80F over ambient, before the intercooler.

You can "turn the boost up" past 18psi on the 335, but there's no more power to be had currently. It just drives up IATs. That means there is a restriction in the system.

I'd start with the headers because it's a fix you can fab more easily. A bigger throttlebody (or multiples) is going to take time, money, and a tuner who's crazy enough.

I assume 18psi would be using forged internals? Which pulley size will run 18psi? For the exhaust I assume 3" instead of 2.5"? Maybe a 3" intake as well? Just planning for the future is all so sorry for all the questions. Some more obvious items would be clutch, drive shaft, and axles.

[SprintexUSA]

An 80mm pulley tickles 19psi. 85mm does 16psi. We don't have any sizes in-between. (Few ever think of lowering the redline, btw.)

We've recommended forged internals all along because it was safer than not recommending it. Nobody can say we didn't warn you . Considering your stock bottom end, 18psi is safer than 24psi. This stock block has still surprised everyone with what it can do, including us.

These higher boost levels do not come into play right off of idle. It all comes in at about 3500rpm according to Mike and Phil. You get about 12psi down low and it builds from there very quickly. This is the nature of the beast because of the smaller engine displacement. Big superchargers and small engines are a little "new" for street or road course usage. This has been historically the realm of things like drag bikes and salt flat machines. They blow right past that boost crescendo because they don't care about using the whole rev range. When using the whole RPM range, then you see it.

BTW--Towing with the 335 is a thing of beauty on the 3.6 Pentastars. I drove from Tucumcari, NM to OKC on one tank of gas, tipping the scales at 8,600lbs in our Dodge Ram V6 with a single axle trailer. It could comfortably use 8th gear. To a geeky gearhead, that was cool.

[WHITE]

Originally Posted by SprintexUSA

The 335 on this motor will do 24psi, but there is currently no real point in pushing it that hard. 18psi is about 10,000rpm on the blower with IATs about 80F over ambient, before the intercooler.

You can "turn the boost up" past 18psi on the 335, but there's no more power to be had currently. It just drives up IATs. That means there is a restriction in the system.

I'd start with the headers because it's a fix you can fab more easily. A bigger throttlebody (or multiples) is going to take time, money, and a tuner who's crazy enough.

Originally Posted by SprintexUSA

An 80mm pulley tickles 19psi. 85mm does 16psi. We don't have any sizes in-between. (Few ever think of lowering the redline, btw.)

We've recommended forged internals all along because it was safer than not recommending it. Nobody can say we didn't warn you . Considering your stock bottom end, 18psi is safer than 24psi. This stock block has still surprised everyone with what it can do, including us.

These higher boost levels do not come into play right off of idle. It all comes in at about 3500rpm according to Mike and Phil. You get about 12psi down low and it builds from there very quickly. This is the nature of the beast because of the smaller engine displacement. Big superchargers and small engines are a little "new" for street or road course usage. This has been historically the realm of things like drag bikes and salt flat machines. They blow right past that boost crescendo because they don't care about using the whole rev range. When using the whole RPM range, then you see it.

BTW--Towing with the 335 is a thing of beauty on the 3.6 Pentastars. I drove from Tucumcari, NM to OKC on one tank of gas, tipping the scales at 8,600lbs in our Dodge Ram V6 with a single axle trailer. It could comfortably use 8th gear. To a geeky gearhead, that was cool.

How are you guys figureing out your blower rpm? From the info I'm working with an 80mm pulley puts the blower at 13,801rpm @ 7400rpm.

I'm not trying to be a smartass, I'm sincerely just curious and want to find out why my information is telling me one thing and you's are saying another. Just want to make sure I have the right understanding of things so I dont spread false info to people in the future.

[SprintexUSA]

I'm using our blower calculator. I need to make a chart of all of the crank pulley sizes across our lineup. Engineering figures that out and I never have to worry about it.

http://sprintexusa.com/sprintex-supe...er-calculator/