Kevin Jewer
DSM Wiseman
- 1,486
- 347
- Jul 25, 2002
-
LaRue,
Ohio
With the 82 housing especially, it is unlikely you will need the anti-surge ports. I wasn't aware that they could reduce power however. I have never run a surge ported cover. The larger turbine housing will increase boost threshold about 200 RPM (using t3 60-1 in TSO4 cover, .63 vs .82, for comparison. Similar max flow rates ~62 lbs vs 65 lbs)). Wether or not the power gained from that is worthwhile is a tougher question to answer. If the lag costs you 2 tenths for example, you'll need to gain 20 hp to counterbalance that. In my experience increasing lag but not increasing airflow ALWAYS resulted in slower ETs, even if MPH went up. In general larger hotsides will increase VE (airflow vs boost pressure), which is always a good thing, and lower knock propensity on pump gas. I always ran .62 housings on 2 liters, and went bigger on the strokers which have another 15-20% more exhaust volume to get rid of at a given boost.
If you are running some hybrid 35R that uses a smaller tubine wheel, which is a practice I am not terribly fond of if the intent is to max out the turbo, that will get some VE back but will also defeat the purpose of using the smaller turbine wheel.
If you don't intend to run more than 30psi on a 2 liter I would just go with the turbo as is with a .63 housing to take advantage of the reduced lag/boost threshold. It will still flow enough at the projected 55 lbs/min you'll achieve in that situation. The FP 3065 is a good example of this (GT30/40 mix) .
Given the goals you have stated, I think it was a wise choice to step down to the 65 lb turbo, which is still quite large but certainly doable. At least you'll have some room to grow, and if boost comes in below 4500 you can do well with it.
To continue the 2 liter at 30 psi example (I use the 30 psi because 99.9% of DSMers never go over 30 psi) flowing 55 lbs/min, there are several turbos running the 3076R wheel that moves ~52 lbs/min that fits very well. Boost threshold on those is usually 25 psi at 4000 rpm in third gear.
If you are running some hybrid 35R that uses a smaller tubine wheel, which is a practice I am not terribly fond of if the intent is to max out the turbo, that will get some VE back but will also defeat the purpose of using the smaller turbine wheel.
If you don't intend to run more than 30psi on a 2 liter I would just go with the turbo as is with a .63 housing to take advantage of the reduced lag/boost threshold. It will still flow enough at the projected 55 lbs/min you'll achieve in that situation. The FP 3065 is a good example of this (GT30/40 mix) .Given the goals you have stated, I think it was a wise choice to step down to the 65 lb turbo, which is still quite large but certainly doable. At least you'll have some room to grow, and if boost comes in below 4500 you can do well with it.
To continue the 2 liter at 30 psi example (I use the 30 psi because 99.9% of DSMers never go over 30 psi) flowing 55 lbs/min, there are several turbos running the 3076R wheel that moves ~52 lbs/min that fits very well. Boost threshold on those is usually 25 psi at 4000 rpm in third gear.
and then make a comment about what you said. I am not the only one that pointed out the fact that YOUR WRONG about the spool and i'm trying to educate you so that you don't have to mod twice because you had unrealistic goals. If you want to be immature and call me an ass and get mad because i'm telling your wrong and trying to educate you that's fine. I don't know everything or even close it doesn't say wiseman next to my name. I'm trying to give you knowledge that others have given me and that I have seen with fellow dsmers cars around me. You odn't want the info fine go buy your t3 to4s t67 and have a blast 
