Turbo Inlet Restrictor Thoughts

[Slahm]

I am thinking of taking my car back to open class, so I can get away from the stock turbo, and generate some HP, but here is the problem.

Rally cars are restricted by class to 34mm(open) or 32mm(production) diameter restrictors placed within 5 cm of the turbo inlet. This restrictor must be 1cm wide, and parallel to the airstream.

Obviously, this really screws up your mapping at higher RPMs, as there is no air, really none at all, but it keeps the sport affordable, and the drivers alive!

So, how do I get the most usable spool? My focus seems like it will be spool up and low rpm power, from maybe 3500-6000. This is where I get power now. Any suggestions based on this, KEEPING IN MIND I will have very little use for a giant turbo, unless it spools quick, and generates boost that I can use with this limited intake. No point trying for power at 10000 rpm, its not gonna happen.

I would like to figure out something that might take the beating of rally antilag, so maybe easily rebuildable with ball bearings? But this is really not a priority.

 

[talontd92tsi]

I have read some things on line about inlet restrictors causing the turbo to overspin due to trying to make power in those areas where the compressor is just too choked off. Something to watch out for, especially when going to a larger turbo.

 

[jakeachy]

Coming from subaru rally experience, you would want a small or big 16g with the 14b exhaust housing. If you want bigger power maybe a hy35, but the restrictor is very detrimental.

You do have antilag already right? If no, you're well behind be curve as is

 

[Slahm]

I was leaning towards a small 16g, for the spool up times, what would the 14B hot side housing change with that?

I used to run a big 16g, but heard the small spools quicker and is very close to the same airflow. I think the restrictor would make them basically even for flow, since I never get to the top of any turbos airflow specs, so that should mean the small 16G is better for me.

I had rally-anti lag, but disabled it due to killing turbos, although that was not what killed them. I plan on turning it on once I am happy that the turbo is set up. And ya, the restrictor is most certainly a headache!