Hypergear Turbochargers and High flow Services Development thread

[Trozzle]

I believe on Facebook he said roughly 3900rpm is full boost...can't give you much more than that sorry

[Randon_I_Am]

can't you see the images?

i think rpm roughly = speed/28 * 1000

spikes up to 19psi at about 4100rpm then bleeds out all the way down to 14ish psi by 6000.

[Harey]

Ours are aftermarket .60 A/R.

Mine blew my cooler piping.

I'm cool. lol

Thanks for the info.

I blew my cooler piping yesterday as well dammit!! Had to be the hardest to get to join as well

[Harey]

This is a ATR43G2 profile turbo on a stock r34 gtt. rb25detneo.

Pretty sure both you and Trozzle have ATR43G3 profiles not G2. Just so other people ordering dont get confused.

[Rolls]

i think rpm roughly = speed/28 * 1000

Thanks for the figures but how did you come up with that? Surely it is entirely dependant on tyre size and diff/gear ratios?

[Randon_I_Am]

that was a quote from someone on here in another thread... i forgot who and where though...

Like i said it's just a rough calc. it all does depend on tyres and diff ratios, but meh close enough.

[Trozzle]

Pretty sure both you and Trozzle have ATR43G3 profiles not G2. Just so other people ordering dont get confused.

what's the difference between the g2 and g3? To my knowledge, I'm running ART43G2 w/ 0.60 A/R compressor, and 0.82 exhaust. Neither the compressor housing nor the exhaust housing are original pieces from my stock turbo.

[Randon_I_Am]

Pretty sure both you and Trozzle have ATR43G3 profiles not G2. Just so other people ordering dont get confused.

I orderd a G2... I have no idea what the differences are so i really couldn't tell ya lol

[hypergear]

Big thanks to Status for his work.

Did another run today with the modified ceramic bb ATR43G3 prototype. Once again few designs worked and some didn't. Its going back to the drawning board.

Also my Valve springs started to go funny. Time for some stronger springs.

[Dale FZ1]

So what did you trial? Just the bearing type vs plain bearing, or did you also swap comp housings and trial ported shroud vs full shroud?

Assuming no changes to the tune were made.

The overlay shows little quantifiable difference but is there any difference on the road and if so which gave you the best "feel"?

[hypergear]

Both curves they were from the same turbo, they were 2x continues runs. Motor started having valve bounce issues. This is without the surge slots.

I also did some power enhancement modifications the turbine housing which worked but got unexpected lag.

[Rolls]

Are you ever going to overlay the various turbo dyno sheets for us to see? Comparison is still very hard to do for your products and I am quite confused where they all stand against each other.

Identical turbos one with the ceramic bearing vs the standard bearing would be great to see overlayed as well. Status should have all the data saved so it should be very easy to compile.

Edited November 8, 2010 by Rolls

[hypergear]

Test car's got engine head problems. Power curve is not responding correctly to tune change due to valve bounce. I will do another run after head reconditioning and get some overplayed sheets with more accurate results then.

Also As far as I can seen I don't really think I can get any thing more responsive then Abe's in this size. Its not about the bearings, its about the surge pressure acting against the large flake of the blades. That slows the shaft speed till the turbine wheel produces more torque. Need to get the anti surge slots working or reduce the size of the blade for more response.

[Harey]

Now put a link on your website which says "Hypergear's Ultimate RB25 turbo - The ABE"

Then watch the sales come flowing in!

[hypergear]

Thanks for another member sending in his footage with an ATR43G3 in .82 turbine running Vipec ECU.

298rwkws with VCT always off and 285rwkws with always VCT on. Not sure how that ECU system worked.

[Harey]

Another great result, geeze VCT makes a huge difference in response! VCT on would be my choice

[Trozzle]

Whoever set the parameters for VCT on/off RPM muffed it lol...I think it would be as simple as to set it to turn OFF at whatever RPM those 2 power curves crossed over.

[Rolls]

Whoever set the parameters for VCT on/off RPM muffed it lol...I think it would be as simple as to set it to turn OFF at whatever RPM those 2 power curves crossed over.

Yeah I think people do always on always off comparisons then turn it on/off where the graphs overlap, eg turn on just above idle as it always makes more power down low and then turn it off around 5500rpm or wherever it is starting to suck power. I'm pretty sure the vipec can turn it on/off at any setpoints.

Don't know why all the rb30 guys get rid of it, sure it might be extra work and f**king around but the difference in huge, eg 500rpm taken off turbo lag and a solid 20kw before that.

[Rolls]

Also As far as I can seen I don't really think I can get any thing more responsive then Abe's in this size. Its not about the bearings, its about the surge pressure acting against the large flake of the blades. That slows the shaft speed till the turbine wheel produces more torque. Need to get the anti surge slots working or reduce the size of the blade for more response.

Problem is if you do that (artificially reducing the profile of the comp wheel) then you push less air into the engine and hence make less torque on the exhaust wheel, you also spin it harder for any specific air flow causing it to top out earlier, be better just using a smaller wheel, get the same effects, comes onto boost sooner but tops out earlier as well. Fairly sure your results with the surge slots confirmed this, came onto boost easier but topped out earlier with less peak power?

The only way I can see it working is if the surge slots are only effective at low rpm and don't leak air at higher rpm, could do something similar with a bov that purposely leaks on low load but it is all starting to sound very tricky.

Edited November 11, 2010 by Rolls

[Trozzle]

Yeah the ViPEC lets you do pretty much anything you want. It's f**king amazing.

Perhaps I should get a single run done on my car with VCT turned off so I can do the same thing....hmm....