Td06 Help/feedback?

[WYTSKY]

Hey guys, recently I have gotten over the 230rwkw power of my car and I want to go on to bigger and faster things.

I once went in Dr drift's 32 with a 25 on it and a td06 20g and it was insane in response and power.... since then I havent been able to keep my mind of these turbos.

Anyway, its been so hard to find one and there is a particular seller on here who is selling a td06 25g, who I do not want to waste their time if I buy a turbo thats not going to make me happy.

I can't seem to find much about these turbos anywhere! in the dyno threads on here or on google..

The idea was/is to get a td06 l2 20g, get a hks lowmount manifold, make up an adapter to convert from T3 to the 3 bolt, and try to keep it hidden from cops as much as possible.

So please help and tell me: td06 20g vs td06 25g? The aim is about 260rwkw at the moment BUT with lots of room for the future without paying and upgrading turbos again. I have all the supporting mods bar forged engine and cams I guess.

For me, response and hard hitting boost is much more important then an extra 20kw....

Would it be possible to get the 25g and instead of the 10cm housing get an 8cm to increase response?

So the range of turbos I am interested in are: TD06's, 3076r, 3071r?, anything else recommended?

One thing to note: The car is a 33 with a 25 in it and still has non turbo compression which apparently helps turbo response, at the moment I have about 15psi at 3,400-3,500, which is pretty responsive for me.

Thanks in advance,

Adam

[Dale FZ1]

I think your biggest limitation with the power chase is going to be the 10:1 DE base you are working from. It would be interesting to see how close to the detonation threshold you actually are, and what sort of ignition mapping you are currently running to avoid knock. I’ve seen a few 25DE+T producing ~300rwhp with pretty good efficiency and response, but nobody has made claims far beyond that.

Turbine sizing is a balancing act in terms of mass-flow and rotor acceleration (read: boost response), so that while a smaller housing in the same family (eg Mitsubishi 8cm v 10cm, or Garrett 0.63 v 0.82 A/R) might give faster boost response, it will ultimately choke earlier. The critical aspect of that with running a 25DE+T is that you do not get the same pressure drop across the engine (ie. rising backpressure), leading to decreased scavenging efficiency, diluted inlet charge, rising combustion temps, and lower detonation threshold. You should inspect a 25DE piston, and note that they do have some sharp detonation unfriendly edges around the valve cutouts. Limitations wouldn’t be so much from the total mass flow through the engine, but the increasing combustion pressures and back pressure. Water injection would have to become increasingly important at some stage just to keep the engine alive.

There is good reason to be cautious about what you could reasonably expect from further development, and the impact on engine life, so be careful. Even with a 9:1 25DET, you’d be making a different turbo choice for 260rwkW vs 300rwkW (longer term), and you’d expect a bit different driving experience from each.

If response and capped hp was your plan, then a 0.78 split pulse EW GT3071would be reasonably innovative for the regular Skyline operator, but at a fairly heavy cost.

Suggest that if you are currently running a Hypergear setup that you get in touch with them and try another of their higher flowing units with a bigger turbine capacity. Cost wouldn’t be too exorbitant, and at least you’ve got a bolt off/on proposition. The Garrett GT3071/76 units are very good.

Good luck and let us know what you do.

[grandmasterb]

Im running a TD06L2 20G (but with the 10cm rear) on my 32 and i can understand where your coming from

Currently i've got the whole kit for sale as im parting my car but if you cant find a 25G maybe have a look at the 20G with the larger rear as an option as it will make the power level your looking for but with more response

[_Ryan_]

There is a vic member selling a 25g.

Edited August 23, 2009 by RB_Ryan

[.75 degrees sideways]

I have a Greddy TD06 20g (10cm rear) kit (highmount manifold and ext gate) for my s2 rb25. It made 254rwkw's at 12psi on a similar engine to mine with slightly less mods, it was also coming on boost at 2000rpm. Wheezy has the Greddy TD06SH 20g turbo (8cm rear) on his rb20 and produced 277rwkw's @ 1.2bar, 25g turbos are good for around 500hp but however you sacrifice response for top end.

[WYTSKY]

I think your biggest limitation with the power chase is going to be the 10:1 DE base you are working from. It would be interesting to see how close to the detonation threshold you actually are, and what sort of ignition mapping you are currently running to avoid knock. I've seen a few 25DE+T producing ~300rwhp with pretty good efficiency and response, but nobody has made claims far beyond that.

Turbine sizing is a balancing act in terms of mass-flow and rotor acceleration (read: boost response), so that while a smaller housing in the same family (eg Mitsubishi 8cm v 10cm, or Garrett 0.63 v 0.82 A/R) might give faster boost response, it will ultimately choke earlier. The critical aspect of that with running a 25DE+T is that you do not get the same pressure drop across the engine (ie. rising backpressure), leading to decreased scavenging efficiency, diluted inlet charge, rising combustion temps, and lower detonation threshold. You should inspect a 25DE piston, and note that they do have some sharp detonation unfriendly edges around the valve cutouts. Limitations wouldn't be so much from the total mass flow through the engine, but the increasing combustion pressures and back pressure. Water injection would have to become increasingly important at some stage just to keep the engine alive.

There is good reason to be cautious about what you could reasonably expect from further development, and the impact on engine life, so be careful. Even with a 9:1 25DET, you'd be making a different turbo choice for 260rwkW vs 300rwkW (longer term), and you'd expect a bit different driving experience from each.

If response and capped hp was your plan, then a 0.78 split pulse EW GT3071would be reasonably innovative for the regular Skyline operator, but at a fairly heavy cost.

Suggest that if you are currently running a Hypergear setup that you get in touch with them and try another of their higher flowing units with a bigger turbine capacity. Cost wouldn't be too exorbitant, and at least you've got a bolt off/on proposition. The Garrett GT3071/76 units are very good.

Good luck and let us know what you do.

Thanks heaps for the detailed input,

at the moment, from what i can see, the highest detonation noise I have is 17, so I have been told I am safe,

its apparent you know alot more about this then me, all i know is that a de piston is slightly domed at the top and the det piston is flat, ie, to increase compression.

If a thicker head gasket were needed to drop the compression slightly then I can accept that, would that be a solution that could potentially increase engine life?

I forgot to mention that in the future i would be considering forging the motor, so I was hoping for a turbo that I could run on a relatively low boost for now and then turn up after.

I was always under the impression that if I stay around the 15psi mark for now that I should be relatively safe.

Btw, I admit I am biased towards the TD06 range because thats the only larger turboed vehicle I have been in other then mine, I have never felt how a 3076r goes. I have seen a number of their dyno graphs are quite impressive, so its not out of the question at all. As for the hypergear tr43, it has been a good turbo, but i just want to sample some other manufacturers too.

Cheers, Adam.

[WYTSKY]

Im running a TD06L2 20G (but with the 10cm rear) on my 32 and i can understand where your coming from

Currently i've got the whole kit for sale as im parting my car but if you cant find a 25G maybe have a look at the 20G with the larger rear as an option as it will make the power level your looking for but with more response

I am actually after the 20g, same as you've got , not a 25g, its just I can't find any! I have sent you a pm. cheers.

By the way, when do you find boost kicks in?

There is a vic member selling a 25g.

Thanks mate, I am talking to him at the moment about it, I just dont want to waste his time if I want a 20g response or close to, out of a 25g and its much laggier.

I have a Greddy TD06 20g (10cm rear) kit (highmount manifold and ext gate) for my s2 rb25. It made 254rwkw's at 12psi on a similar engine to mine with slightly less mods, it was also coming on boost at 2000rpm. Wheezy has the Greddy TD06SH 20g turbo (8cm rear) on his rb20 and produced 277rwkw's @ 1.2bar, 25g turbos are good for around 500hp but however you sacrifice response for top end.

Thanks for that mate, the only question I want to know, is how much roughly response do I loose?

[.75 degrees sideways]

about 4k or so

[WYTSKY]

hmm, so about 4,000 full boost for a 25g and for a 20g about what, 3,400? Im just basing that on the one I went in.