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You answer your own question the h has a bigger turbine wheel I had the td06h-20g on my 20 and was seeing full boost at 4200 18psi so it's only a few rpm if you want bigger numbers

Not really. Ill word it better this time lol.

In terms of 350KW going the 12CM housings on the TD06SH 25G and the T67 25G both can do it but would the TD06SH bigger wheel (more lag) would it be worth it for the extra power it make. As if it makes say 15more HP with much more lag then it wouldnt be worth it?

But i cant find much info comparing the 2 or in 12cm housings, so im just asking opinions.

If you were looking for a easy 350KW on 98 would it be better to go as TD06SH 25G 12cm or T67 25G 12cm?

Is that a fair statement? An easy 350rwkws on 98? I suspect it would take 20-22psi on a well tuned RB25 to make that power....I still go by Dyno Dynamics numbers...I dont know if that makes a difference but I think you can say the T67 and TD06H-25G will both make an easy 310rwkws at 16-17psi. The "H" version may make in the vicinity of up to 10-15rwks more?

I am not sure that going to a bigger exhaust housing will also give you significantly more power as the 10cm doesnt appear to be a restriction. Agree that if you went from a restrictive housing to a more free flowing housing you would bet results.

I suppose I am a bit of a scratched record but think we should all be careful about throwing numbers around, especially numbers that may be a little high

The td06 is a good turbo fairly responsive yet gives good top end the td06h-25g is bigger then the t67

Well I noticed one of the guys is making 400+ kw off his t67 and my aim is around 300-350. So maybe I need to look at the 20G instead of the 25G?

Simon's car is an animal and makes whatever power it does...its a big number because the thing runs 11 flat on the quarter and blitzes around race tracks. He has various dyno sheets from various shops where the car has been run. He runs a 50:50 E85 mix, so that helps with power, but still not a full E85 tune (is there much difference in outright power? I got no idea...but I know its helping his power over std 98)

I think it was a dynapak that put it at 410rwkws. A dyno dynamics put it at 480rwhp (or 360rwkws)...so as BSA GTScoT and others have been saying...do your own research and look at other sources rather then just SAU. If you want 350rwkws from an RB25 I think you need to push a 25G based turbo.

the way I see it, the last thing the h wheel will do is add power anywhere in the band. What it will do is add a little more scope to the compressors maximum flow.

Simon has already noted that his compressor has maxed out before the hotside, what more do you need?

that being said its no science to see the h wheel will be application specific. For example if i wanted blitzing 350kw and i put a t67 on a bad ass rb34 but the thing maxed out at 5500rpm, i would know the restriction was in the hotside. I would then try move to a larger housing, and if that did not yield the result inwas after I would then move to a h optioned unit.

Obviously the idea is bring the thing on later and keep it on longer. It would be trial and error between 10cm H or 12cm L2 in my eyes.

And again Simon is reving his to 8 with no sign of turbine cap. Now lets all forget about the h turbine until someone builds that bad ass rb34 i mentioned.

Simon's car is an animal and makes whatever power it does...its a big number because the thing runs 11 flat on the quarter and blitzes around race tracks. He has various dyno sheets from various shops where the car has been run. He runs a 50:50 E85 mix, so that helps with power, but still not a full E85 tune (is there much difference in outright power? I got no idea...but I know its helping his power over std 98)

I think it was a dynapak that put it at 410rwkws. A dyno dynamics put it at 480rwhp (or 360rwkws)...so as BSA GTScoT and others have been saying...do your own research and look at other sources rather then just SAU. If you want 350rwkws from an RB25 I think you need to push a 25G based turbo.

Roy is pretty much spot on here... 410kw at the hubs on a happy hub dynapak 360rwkw on a dyno dynamics roller.

My mix has a huge advantage over a 98 tune. It probably would not make any extra power with E85 as we can wind as much timing as we want in without detonation as it is

the way I see it, the last thing the h wheel will do is add power anywhere in the band. What it will do is add a little more scope to the compressors maximum flow.

Simon has already noted that his compressor has maxed out before the hotside, what more do you need?

that being said its no science to see the h wheel will be application specific. For example if i wanted blitzing 350kw and i put a t67 on a bad ass rb34 but the thing maxed out at 5500rpm, i would know the restriction was in the hotside. I would then try move to a larger housing, and if that did not yield the result inwas after I would then move to a h optioned unit.

Obviously the idea is bring the thing on later and keep it on longer. It would be trial and error between 10cm H or 12cm L2 in my eyes.

And again Simon is reving his to 8 with no sign of turbine cap. Now lets all forget about the h turbine until someone builds that bad ass rb34 i mentioned.

I think it may be maxed out, don't know that for sure... May be another issue, either way I don't really need any more power

In saying that, I may be going from Nistune to Vipec and dropping some cams in soon... Someone stop me FFS

Is that a fair statement? An easy 350rwkws on 98? I suspect it would take 20-22psi on a well tuned RB25 to make that power....I still go by Dyno Dynamics numbers...I dont know if that makes a difference but I think you can say the T67 and TD06H-25G will both make an easy 310rwkws at 16-17psi. The "H" version may make in the vicinity of up to 10-15rwks more?

I am not sure that going to a bigger exhaust housing will also give you significantly more power as the 10cm doesnt appear to be a restriction. Agree that if you went from a restrictive housing to a more free flowing housing you would bet results.

I suppose I am a bit of a scratched record but think we should all be careful about throwing numbers around, especially numbers that may be a little high

24-25psi and that would the least amount in that turbo sizing..

cheers

darren

... may be going from Nistune to Vipec and dropping some cams in soon... Someone stop me FFS

Why the change from Nistune to Vipec? I Interested to know what cams you are looking at as well. I would be tempted to stick with the std inelt cam and go baby 256 exhaust cam

Why the change from Nistune to Vipec? I Interested to know what cams you are looking at as well. I would be tempted to stick with the std inelt cam and go baby 256 exhaust cam

Remove the AFM from the equation... The Z32 is out of its depth already and makes the cooler piping a lot better!

Cams would most likely be a set of poncams.

Remove the AFM from the equation... The Z32 is out of its depth already and makes the cooler piping a lot better!

Cams would most likely be a set of poncams.

cheap ponnies on american ebay atm mate autocat51 is the seller..

http://www.ebay.com.au/itm/Tomei-PonCam-Cams-Camshaft-ECR33-R33-RB25-RB25DET-/190486773888?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c59e58080

Neo

http://www.ebay.com.au/itm/Tomei-PonCam-Type-B-Cams-Camshaft-R34-RB25-RB25DET-Neo-/360291534189?pt=Motors_Car_Truck_Parts_Accessories&hash=item53e30c856d

I got Neo ones and they where $640 to my door...and delivered fast..

cheers

darren

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