quattro527
15+ Year Contributor
- 46
- 2
- Jun 23, 2006
-
Los Angeles,
California
When inquiring about the 18G, perhaps the most popular response is "18G... lag of a 20G, but power of a 16G". 
BUT PRICING ASIDE, how are these two turbos compared?
EvoIII TD05H-16G vs TD05H-18G?
or
EvoIII TD05H-16G vs TD06x-18G?
Also, what housing sizes are being compared? 7cm²? 8cm²?
The reason I ask this is because I've searched and read through 30+ pages of the same information: ("I love my 18G", "18G sucks! I rather keep my EIII16G!", etc..."
And the final twist (please let me know if this has been done and feasible):
Many often complain that the TD05H tends to "run out of breath" up top, which is why many opt to go with a TD06H/SL2 instead. However, has anybody ever ran a TD05H turbine inside a bigger housing, such as a 8cm²? I have found a few companies that are able to machine the turbine housing in a 8cm², but I am not sure how much more efficient it would be.
If anybody can shed some light on this topic, I would much appreciate it. I come from a background of Garrett turbos, where if you run out of turbine, the common thing to do is trying to go with a bigger A/R housing before pulling the trigger on another turbo (ball bearings require replacing the entire CHRA which is NOT cheap). Regarding nozzle area sizes and A/R's, here is the information that was provided to me... please make any corrections if necessary:
MHI 6 cm2 = Garrett 0.41 A/R (T25?)
MHI 7 cm2 = Garrett 0.49 A/R (T25?)
MHI 8 cm2 = Garrett 0.57 A/R (T25?)
Assuming these comparisons are accurate, wouldn't upping the housing size from a 7cm² to a 8cm² be somewhat beneficial without creating that more more lag? The Garrett series turbos typically run a substantially larger A/R than the MHI's... most GT28xx series in a T25 housing is offered in a 0.64 or 0.86 A/R.
Please excuse my ignorance on the MHI turbos, but if someone could chime in, that would be awesome.
-Jeff
BUT PRICING ASIDE, how are these two turbos compared?
EvoIII TD05H-16G vs TD05H-18G?
or
EvoIII TD05H-16G vs TD06x-18G?
Also, what housing sizes are being compared? 7cm²? 8cm²?
The reason I ask this is because I've searched and read through 30+ pages of the same information: ("I love my 18G", "18G sucks! I rather keep my EIII16G!", etc..."
And the final twist (please let me know if this has been done and feasible):
Many often complain that the TD05H tends to "run out of breath" up top, which is why many opt to go with a TD06H/SL2 instead. However, has anybody ever ran a TD05H turbine inside a bigger housing, such as a 8cm²? I have found a few companies that are able to machine the turbine housing in a 8cm², but I am not sure how much more efficient it would be.
If anybody can shed some light on this topic, I would much appreciate it. I come from a background of Garrett turbos, where if you run out of turbine, the common thing to do is trying to go with a bigger A/R housing before pulling the trigger on another turbo (ball bearings require replacing the entire CHRA which is NOT cheap). Regarding nozzle area sizes and A/R's, here is the information that was provided to me... please make any corrections if necessary:
MHI 6 cm2 = Garrett 0.41 A/R (T25?)
MHI 7 cm2 = Garrett 0.49 A/R (T25?)
MHI 8 cm2 = Garrett 0.57 A/R (T25?)
Assuming these comparisons are accurate, wouldn't upping the housing size from a 7cm² to a 8cm² be somewhat beneficial without creating that more more lag? The Garrett series turbos typically run a substantially larger A/R than the MHI's... most GT28xx series in a T25 housing is offered in a 0.64 or 0.86 A/R.
Please excuse my ignorance on the MHI turbos, but if someone could chime in, that would be awesome.
-Jeff
