Tightmopedman9 Posted November 7, 2012 Author Report Share Posted November 7, 2012 Damn, looks like you may be right. Cast in the exhaust outlet is a '8', I'm assuming that means 8cm. I was under the impression that Hahn only produced a 10cm^2 ehxuast housing for their 20g's Quote Link to comment Share on other sites More sharing options...
mdlimy Posted November 7, 2012 Report Share Posted November 7, 2012 thats definetly not a 10cm2.... ditch it for a real hrc 20g, that things gonna be too small. 2 Quote Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 7, 2012 Author Report Share Posted November 7, 2012 (edited) Measured the turbine. TD06 wheel, 8cm^2 housing i.e. .57 A/R. I should have been more diligent in my research . Seems like the only way I could salvage this is by selling it on a DSM forum and buying the TD06H 10cm^2 Hahn. Just for comparison sake, what's the A/R of the stock 15G? EDIT: http://www.turbosystem.com/hahn/parts/s20gh.htm According to that the TD06 8cm^2 housing actually develops boost later than the 'normal' 20g. Turns out it may not have been a mistake B) Edited November 7, 2012 by Tightmopedman9 Quote Link to comment Share on other sites More sharing options...
magicaljake Posted November 7, 2012 Report Share Posted November 7, 2012 thats definetly not a 10cm2.... ditch it for a real hrc 20g, that things gonna be too small. ironic when the majority of these kids are running td04's Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted November 7, 2012 Report Share Posted November 7, 2012 Measured the turbine. TD06 wheel, 8cm^2 housing i.e. .57 A/R. I should have been more diligent in my research . Seems like the only way I could salvage this is by selling it on a DSM forum and buying the TD06H 10cm^2 Hahn. Just for comparison sake, what's the A/R of the stock 15G? EDIT: http://www.turbosyst...parts/s20gh.htm According to that the TD06 8cm^2 housing actually develops boost later than the 'normal' 20g. Turns out it may not have been a mistake Yeah, BUT the 'normal' 20g that is used on DSM's, etc is not the same as the HRC 20g - theirs is a hybrid. You will not be happy with a smaller housing than 10cm2 on a 5cyl motor.... Quote Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 7, 2012 Author Report Share Posted November 7, 2012 Sorry, I'm not sure I really understand what you're saying. The turbo I have is the one mentioned on that page, which, as they seem to describe, flows better than their 'super' 20g. The TD06 turbine wheel apparently makes more of a difference then the loss in cross sectional area of the exhaust housing. I'm going to stick with this turbo. Maybe it won't flow as well as super 20g at redline (which would be contradictory to what I said above), but it is significantly larger than my stock turbo, which keeps me happy. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted November 7, 2012 Report Share Posted November 7, 2012 Sorry, I'm not sure I really understand what you're saying. The turbo I have is the one mentioned on that page, which, as they seem to describe, flows better than their 'super' 20g. The TD06 turbine wheel apparently makes more of a difference then the loss in cross sectional area of the exhaust housing. I'm going to stick with this turbo. Maybe it won't flow as well as super 20g at redline (which would be contradictory to what I said above), but it is significantly larger than my stock turbo, which keeps me happy. Their language on that page is confusing. They are also referring to 4cyl applications, so quite different in terms of exhaust flow... That turbo is NOT better flowing than the Super 20g. What's different about the HRC versions is the mating of TD06 compressors with TD05 hotsides, that's what improves spool. BUT.... you can get into an area where the smaller hotside creates a problem in upper rpms/higher flow situations. I had this problem when I switched to a Garrett 60-1 on the TD05 HRC hotside, spool was GREAT, but it was choking up top (over 6600rpm) due to the mismatch in sizing. Having a hotside smaller than 10cm2 will simply mean you will hit the upper limit earlier rather than later. This may not be an issue for you, and of course, it will be a significant improvement over the TD04 series. You could modify the outlet to improve flow - cut out that WG disc & add a dump tube back into the DP - the stock outlet is restrictive. Weld an ear for the flange, switch to 4 bolt flange Quote Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 7, 2012 Author Report Share Posted November 7, 2012 (edited) Haha, over 6600rpm, I don't think my redline will even be that. This turbo will tide me over for now I'm sure, we'll see what I think after its in and tuned. Thanks for the second opinion though! I've also been doing some reading over on NASOIC and lots of guys are running the TD06 8cm on their 2.5 STIs without much of a problem. Edited November 7, 2012 by Tightmopedman9 Quote Link to comment Share on other sites More sharing options...
RZT5 Posted November 7, 2012 Report Share Posted November 7, 2012 I did a little bit of research on this when I was picking a turbo. I believe Tightmopedman was correct. A TD06-8 will flow a little more at the top end than a HRC TD05H-10. Basically, the larger TD06 wheel more than makes up for the smaller housing A/R. The effects of turbine wheel size are well known in the turbo after-market. Companies like Forced Performance have been making 600+ awhp capable turbos out of stock TD05 frames simply by using massive turbine wheels. Quote Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 7, 2012 Author Report Share Posted November 7, 2012 Awesome info! Hopefully, I don't run into streetability issues, but with the size turbos some of you are running I think I'll be fine! Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted November 7, 2012 Report Share Posted November 7, 2012 I did a little bit of research on this when I was picking a turbo. I believe Tightmopedman was correct. A TD06-8 will flow a little more at the top end than a HRC TD05H-10. Basically, the larger TD06 wheel more than makes up for the smaller housing A/R. Yes - this is true - I misread that his impeller was the hybrid TD05 used by Hahn. If it's the TD06, then it will flow more, but spool later, of course - but maybe that is offset by the smaller housing. This is a TD06 - TD05 comparison - I didn't think his looked to be the larger TD06... TMM9, did you measure the impeller? Quote Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 7, 2012 Author Report Share Posted November 7, 2012 (edited) Yep.. Exducer: 2.175 Inducer: 2.560 http://vfaq.com/mods...bo-compare.html Looking at the wheels, I didn't realize that the TD06 was that much bigger. Is that a TD05H or just a TD05? Edited November 7, 2012 by Tightmopedman9 Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted November 7, 2012 Report Share Posted November 7, 2012 Yep.. Exducer: 2.175 Inducer: 2.560 http://vfaq.com/mods...bo-compare.html Looking at the wheels, I didn't realize that the TD06 was that much bigger. Is that a TD05H or just a TD05? That's the TD05H, from the HRC 20g on the right. The 20g compressor wheel is above it. The wheel on the left is what I upgraded to, a Garrett 60-1 (before moving to the PTE 6262bb) another view . Quote Link to comment Share on other sites More sharing options...
mdlimy Posted November 8, 2012 Report Share Posted November 8, 2012 it all comes down to how much hp you want to make. And by the way, almost every comment made in this thread about hp capabilty is in reference to a 4cylinder with the exception of me and hussien...There is a difference between a 5 cylinder 2.5 and a 4 cylinder 2.5 fyi.... Quote Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 20, 2012 Author Report Share Posted November 20, 2012 Slowly making progress. Made a cam holder out of angle iron and got the VVT issue straightened out. Got a 14point7 wideband today. I need to figure out how to power it... 5A for the lambda heater and 500mA for the unit itself. Any ideas where I could tap the power line? And a 3" V-band adapter for the turbo. Only $40 for the adapter, V-band flange, shitty V-band clamp and metal gasket! The manifold is currently at the machinist and will be back tomorrow. I got all the turbo plumbing ready, I'll get some pictures of it all on the engine tomorrow. Quote Link to comment Share on other sites More sharing options...
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