Yeah I think the filter box is going to be a good thing even if it looks like something that that shoulod be under the hood of an International semi truck. I was talking to my import buddy with the VR4 about reversion & he sent me this link.
Tuning the LET - Exhaust
Its a pretty good write up I think. I wonder how hard it would be to make a peak hold gauge to measure exhaust back pressure. It would be interesting to compare peak back pressure to peak boost pressure. It seems that it would give some insight to if I need a bigger AR housing on the exhaust side.
I like the article but it needs to be read carefully, most only applying to a front mount set up. Some of the info does apply.
2 to 1 was what we would shoot for on boost vs. back pressure.
I can simplify the a/r thing.
I look @ the a/r like a camshaft in an engine, you are picking the range of operation. If you want boost sooner a smaller a/r , and larger a/r for more top end. You will scarafise so top end power with the smaller a/r.
I looked @ the LS1 forum yesterday. What a mistake. There were guys that wanted to take the SAME turbo and run it in a front mount, then a rear mount set up and compare.
No correct rear mount unit would work well in a front mount, and the front mount would be to big the back. The farther back you go, the smaller the compressor and a/r you need. Move it forward and you need to get bigger.
You will win this battle because you are increasing the efficiency and making more with less.
All rear mount turbo’s I used were custom, hybrid units best suited for the rear mount. The key is making more power with less boost.
If you need to ram 30-50 psi in the motor, most of the time that will be out of the compressor maps of your unit, it will add heat by working the turbo to hard and hurt efficiency. I have seen more boost with little or no HP improvement when outside the map.
Buy a bigger turbo and run lower boost.
Rear mount is way different than front mount set up.