Like the title says, what would be the best upgrades for a turbo car?
I'm not asking for bigger turbos or bigger intercoolers, i want to know what would be the things that make it more efficient, maybe downpipe and exhaust (3 inch?) as well as a bigger cat (same size as the exhaust system)? a boost controller to increase boost when need it.
This is for a 2.4L inline 4 cylinder engine running about 4-6 psi
This engine has a small turbo, not sure which one cuz i haven't seen it, but it start to spool at about 2300 RPM, not sure what a bigger exhaust would make to it, any ideas and advices are welcome

EDIT: manufacturer says it's 190HP, but that is probably crank rated

 

I would say.

Turbo-back exhaust system w/o Cat.

That should allow for the turbo to spool faster.

Then a Boost controller to raise the boost.

 

is there any boost controller that lets you run stock boost and if you click a botton it runs the amount of boost you want?
and does the boost controller works with another part? (example: BOV or wastegate?)

 

first most stock turbo cars benefit from a better free flowing exhaust system
second, most electronic boost controllers, avc-r, profec-b, hks have that function to boost one level, and then boost another level at a press of a button.

 

ok, and about the boost controller, do they work with the BOV to make the dessired boost? or what do they use to control it?

 

the XS dual stage boost controller can do this. You have a switch that will allow you to switch between 2 predetermined boost levels... you can set 1 to stock and the other to whatever psi you prefer.

good part is, they can be had for 120 bucks off ebay, new. They are the best for keeping boost spikes and decreasing lag, commonly associated with more exepensive electronic ones. IF you have the money... a profect B would work nicely though.

 

BOV has nothing to do with controlling boost. The device that controls boost is the wastegate. the boost controllers work with the wastegate to control boost levels. BOVs are used to relieve pressure that remains in the piping when the Throttle Body is closed.

 

How about an aftermarket intercooler... I wouldn't up the boost much without a better intercooler.

 

I'm just curious why you wouldn't just turn up the boost and leave it at say 10psi. I mean this is a factory boosted engine so there is no way that an extra few pounds is gonna hurt it. In my experience you only (practically) use a dual stage boost controller if you are having traction issues.
Unless you are worried about fuel economy?

BTW what motor/car is this exactly?

 

good questions, first, this is not my car, is a friends car. second, we want to improve things before turning up the boost. third, whole exhaust will be made, a better intake filter, and perhaps an intercooler. Fourth, the car is an Opel Astra Coupe turbo 2.0 L engine inline 4 cylinder pumping out 190HP (crank is my guess) but chevrolet sells it here under chevrolet badge.

 

by the way, has anyone ever heard of a turbo that start spooling at around 2,300 RPM?? i see this number awefully low, but i don't know much about turbos, and if it is possible then it should be a VERY small turbo