Innovate/Spritex/Bullet... What I found searching the web.

[Draco-REX]

Originally Posted by ATL BRZ

I knew the sound differences already. What I'm still not clear on if there are any performance advantages to straight-cut gears in a Centri SC unit over Helical gears.

I don't think so. Ratios are ratios. If they can cut the same ratio between the two, then I don't think there is any difference in this application. Vortec has pretty much proven that the added strength that straight-cut gears provide is unneeded for a SC.

Straight cut gear MAY provide longer OCIs with the SC oil due to having less sheer between the teeth, but with today's synthetics I doubt it'd be noticeable.

[ATL BRZ]

Originally Posted by Draco-REX

I don't think so. Ratios are ratios. If they can cut the same ratio between the two, then I don't think there is any difference in this application. Vortec has pretty much proven that the added strength that straight-cut gears provide is unneeded for a SC.

Straight cut gear MAY provide longer OCIs with the SC oil due to having less sheer between the teeth, but with today's synthetics I doubt it'd be noticeable.

Gotcha. So no real performance differences in the two gear types, just sound. The sound also being end-user preference in quieter vs loud whine. I think Vortech made the right choice with the quieter of the two gear designs.

Leave the whining to the twin-screws.

[Calum]

Originally Posted by Draco-REX

It's a lot less complicated and a lot more superficial. Straight-cut gears whine when put under load. Watch an in-car video of a dedicated racecar and you'll hear a similar whine from the tranmission because it has straight-cut gears for strength.

Twin Screw SCs make a loud whining noise when under load that a lot of people like. Vortech uses helical-cut gears to keep noise down because they sell a lot of street applications. So it would be harder to tell the car is supercharged by ear alone. I think there's only a faint whine at really high RPMs.

Here's a comparison, top are Helical, bottom are straight cut. (linked due to HUGE size)
http://image.streetrodderweb.com/f/3..._cut_gears.jpg

The funny thing is, helical cut gears are, with the same material, size etc..., are stronger then a straight cut gear. This is due to the way the force is applied as they rotate, it starts off low at the tip of the tooth, builds and spreads across the face of the tooth as the gears rotate, then reduces until there's no force on the tooth. Straight cut gears whine due to the shock of the way they load. The disadvantage of helical cut gears is they cause a thrust along the axial plane of the gear. This causes the gears to walk if a thrust bearing isn't used. Using a thrust bearing increases cost and heat as the thrust is absorbed and dissipated as heat. There's also double helical gears, but that gets pretty expensive of to machine.

[Draco-REX]

Originally Posted by ATL BRZ

Gotcha. So no real performance differences in the two gear types, just sound. The sound also being end-user preference in quiet vs loud whine. Honestly I think Vortech made the right choice with the quieter of the two gear designs.

Leave the whining to the twin-screws.

See, I love that sound. I want to hear it scream every time I put my foot down.

[2forme]

Originally Posted by Draco-REX

See, I love that sound. I want to hear it scream every time I put my foot down.

I agree. I feel like if I had the sound, then kiddies in their civics and rsx's would quit trying to race me LOL.

[Superhatch]

Originally Posted by Calum

Using a thrust bearing increases cost and heat as the thrust is absorbed and dissipated as heat. There's also double helical gears, but that gets pretty expensive of to machine.

So are straight cut gears in race transmissions used mainly as a cost saving measure by not requiring a thrust bearing?

[Calum]

Originally Posted by Superhatch

So are straight cut gears in race transmissions used mainly as a cost saving measure by not requiring a thrust bearing?

I know the reasons I listed above are why our gear box at work uses double helical cut gears. But why race car transmissions use straight cut is beyond me. It could be that strength isn't much of an issue, but heat, space, and weight are are.

Edit: Before anyone starts comparing a race cars power output without knowing what we're dealing with at work, we're pushing close to 1.3 million ft/lbs of torque. Not really the same application.

[s2d4]

Originally Posted by akuhei

I have seen nothing suggesting that any normal customer has received one yet, and certainly no dyno's have been posted since January.

I've seen one. The non disclosure agreement is doing more harm than good in this case.

[mad_sb]

Originally Posted by ahausheer

If you are under a non-disclosure agreement and you cant release data logs or specific info you shouldn't come down on someone involved with the project. Its not professional and at worst its libelous. If you will be promoting another tuner or tune it is also a conflict of interest. Just saying.

Not if the NDA is limited to him running the kit on his car

[Accurate Race Shop]

http://www.jk-forum.com/jk-show-tell...228159/page20/

found a sprintex that messed up... It was a leaking seal and sprintex replaced the entire kit at no charge and sent it overnight to the customer.

For those doubting their customer service this makes a me feel pretty good that I will be taken care of if an issue arises.

[robispec]

Originally Posted by Draco-REX

$64,000 question:
Stage 1 or Intercooled Stage 2?

Stage 1 on e-85

[Accurate Race Shop]

Originally Posted by s2d4

I've seen one. The non disclosure agreement is doing more harm than good in this case.

I agree I don't like the fact that everyone that gets their hands on one has to be quiet about it. Hopefully they have something soon sounds like they are almost there it they are getting them out to different race shops.

Sent from my SGH-T989 using Tapatalk 2

[Draco-REX]

Originally Posted by robispec

Stage 1 on e-85

I'm interested in the results, but it also worries me that the Stage 2 kit doesn't seem to be getting any R&D time...

[xxscaxx]

Originally Posted by robispec

Stage 1 on e-85

This is something i'd be interested in immensely...

Guessing the intercooled kit isn't making enough power to warrant it? just taking a guess.

@robispec - Are you going to be allowed to release the dyno numbers/chart on thursday?