Sprintex Upgrade - announced on facebook - coming soon

[350matt]

Bent rods owch!

how much boost was that then? and at what rpm?

[xxscaxx]

guess that means i'm out on this upgrade if its really going to be strongly advised you build the motor. Not going down that road again.

[tahoward]

Originally Posted by xxscaxx

guess that means i'm out on this upgrade if its really going to be strongly advised you build the motor. Not going down that road again.

I'm considering doing a light lower build with a new base block; rods, bearings and studs.

What was your experience with a build?

[xxscaxx]

Originally Posted by tahoward

I'm considering doing a light lower build with a new base block; rods, bearings and studs.

What was your experience with a build?

Its not on the same platform so it doesn't hold value here, but I rather stay on a stock motor. I built an EJ and spent a lot of money only to have to pull it out again for a teardown. Don't ever really see high mileage motor builds rolling around.

Could be way different for this motor, but its just not something I'd personally go through again lol.

I was hoping this upgraded unit would be a step up in power but not to the motor build point. Maybe on lower boost I could pull it off, but we have to wait and see.

[sw20kosh]

Originally Posted by xxscaxx

Its not on the same platform so it doesn't hold value here, but I rather stay on a stock motor. I built an EJ and spent a lot of money only to have to pull it out again for a teardown. Don't ever really see high mileage motor builds rolling around.

Could be way different for this motor, but its just not something I'd personally go through again lol.

I was hoping this upgraded unit would be a step up in power but not to the motor build point. Maybe on lower boost I could pull it off, but we have to wait and see.

I would just run a low boost pulley on the larger unit. Target the same boost that the small blower was putting out. The result would be less hot air and it wouldn't get winded up top as it isn't spinning anywhere near it's redline? All speculation at this point but it should make sense. Maybe the gains are not really worth all that trouble/$.

[diss7]

They are saying built motor to cover their ass. Based on what others have achieved with the motor, I would run it as is. But, with the knowledge I have signicantly increased the risk of engine/driveline failure; as you have with any FI kit.

I certainly wouldn't pre-emptively build the motor.

Big blower + built toda stroker motor = win

[cantholdanymore]

People wants moar pawar
Kit provides moar pawar
Kit needs engine build to support moar pawar.
People call it fault

[xxscaxx]

Originally Posted by sw20kosh

I would just run a low boost pulley on the larger unit. Target the same boost that the small blower was putting out. The result would be less hot air and it wouldn't get winded up top as it isn't spinning anywhere near it's redline? All speculation at this point but it should make sense. Maybe the gains are not really worth all that trouble/$.

Thats my intention if its possible

Originally Posted by diss7

They are saying built motor to cover their ass. Based on what others have achieved with the motor, I would run it as is. But, with the knowledge I have signicantly increased the risk of engine/driveline failure; as you have with any FI kit.

I certainly wouldn't pre-emptively build the motor.

Big blower + built toda stroker motor = win

True, but this supercharger = instant power down low. I know turbos are making power down low but they still need to build boost and will place less stress on the motor. Someone correct me if i'm wrong here, but thats my assumption on it lol.

If this thing can make like 350whp without overstressing, I really think its going to get a LOT of attention.

[Ingen]

Why can't there be an interlock between the tach and a blowoff valve that prevents the excess boost at low RPM, and feeds it in at higher RPM?

that can't be that damn hard to engineer. Certainly it's cheaper than new rods!

[Calum]

Originally Posted by Ingen

Why can't there be an interlock between the tach and a blowoff valve that prevents the excess boost at low RPM, and feeds it in at higher RPM?

that can't be that damn hard to engineer. Certainly it's cheaper than new rods!

You could just limit the max throttle opening at low rpm, via the tune.

[EAGLE5]

Remember, since an SC runs off the engine directly, it takes power to make power. 250HP at the crank might require 300HP worth of stress with 50HP going to run the blower. That plus lower rpm=engine problems. A larger blower will mean more friction, more mass, and more effort to spin for the same HP, at least much of the time. For most people, the smaller blower will probably be better, and remember, you can always twin charge!

[xxscaxx]

Originally Posted by Ingen

Why can't there be an interlock between the tach and a blowoff valve that prevents the excess boost at low RPM, and feeds it in at higher RPM?

that can't be that damn hard to engineer. Certainly it's cheaper than new rods!

Maybe because that defeats the whole purpose of a twin screw blower that makes instant boost? Lol

They make those, it's called vortech and rotrex.

[tech4pdx]

Bow down to the almighty TWIN SCREW.. Creator of POWAH. May it wet your undergarments and bring joy to those who use it!

[Xero-Limit]

We can alter the boost down low with cam timing by letting the blower exhale with a partly open exhaust valve towards the end of the stroke. Reduces boost by several psi. We can also drop timing down low to cut down on power, so that portion is no big deal. But the big blower will eat HP and add weight, so any gains from the cooler charge will be lost. Stock motor I see no issues with 70mm and cooler or e85, or the 72.5 if you want to stay below the continuous redline of 15000 rpm at all times.

Originally Posted by Ingen

Why can't there be an interlock between the tach and a blowoff valve that prevents the excess boost at low RPM, and feeds it in at higher RPM?

that can't be that damn hard to engineer. Certainly it's cheaper than new rods!