You should probably just google how a turbo works. For a stock car, you need to have a load on the car and be accelerating. Simply coasting at any given rpm does not create boost.

 

What model year and mods do you have ?

When you say you hold it at 3k, you won't spool unless you go wot. I'm assuming you did that right ?

If you do, you can set MFTo show boost level and depending on the first question above you should see instant boost. Stock turbos you won't see much lag.

 

Thanks droptopp. It is a 2015 GTR Premium, 100% Stock. When I push the pedal to the metal (wot), I still feel a bit of lag. So in general, will the turbo spool faster, if you are in a higher rpm or it doesn't matter what rpm you are at? Is there a way to make the turbo spool faster?

Thanks again.

 

you gotta put little back into it.

 

I think the comment regarding "Googleing" how a Turbocharger works is the right idea for you. Forced air induction is simply forcing (a.k.a. boosting or pushing) more air into the engine...and if set up properly, the fuel will also increase and you generate more HP. Supercharging is mechanically turning the blower typically with a belt drive off of the engine......reaction time is quicker, but you gain a parasitic load since the engine is driving the blower. Turbocharging uses the waste exhaust gases to spin the blower, so it's basically free power. There typically will be a lag with a turbocharger if the engine is at a low RPM and not generating a lot of exhaust flow, but once that exhaust flow starts increasing the turbo will wind up right now quick. The term spooling a turbo (the hot and cold wheels inside the blower start turning faster) simply means you are engaging the turbo with demand for more power....hit the accelerator, fuel increases, engine starts revving faster, exhaust gases increase, turbo spins faster forcing more air into the engine, revving happens quicker, you go faster. I'm no sure how fast the GT-R turbos turn at full throttle, at least 20,000 rpm one would expect. Big diesel engines in equipment typically will turn at 80,000 RPM and natural gas large engines run at 120,000 rpm.

Load factors on the engine play into how quickly a turbo will spool up. At 3000 RPM, it should react very quickly in 1st and 2nd gears and a little slower as you move higher in the gear ranges, if the car is simply cruising and you then stab it. I'm been on the highway in 6th gear and kicked the accelerator and the car reacts almost instantaneously. If you're doing that same RPM in fist or second gear and kick it, it's "right now" going to spool up....just like pulling the trigger. Boost comes on in a heart beat.

The next lesson is on aftercoolers, which the GT-R has and wouldn't be near as quick as it is, without them......

 

Thank you erek and tzoid.

One last question, i was told by the gtr technician at the dealership not to shutdown the car right away but give it a minute or two (after you are having so much with your turbo)

My question, what will be the instrumentation that we need to check before turning off the car? Will that be the engine temp or maybe a turbo temp (not so sure if this exist) in gtr that I can chevk so that I dont just shut off my car but wait for a while to let the temp down. Or will this be done automatically by the computer, meaning even if you shut off your engine, if it is still hot, the engine fan will still run automatically.

Thank you.

 

It is never a good idea to shut a car off immediately after running it hard. What your tech is talking about used to be a problem with older turbos that were not water cooled and people would by a turbo timer to keep oil recirculating through the turbos. It is not needed with today's newer turbos.

Start reading and learning as much as you can.

 

Basically people used to run timers on their cars to allow it to run to allow to let the car cool down. Its a good idea to let the engine cool down a few minutes or if you can, drive the last few miles very conservatively. It works well too.

 

Awesome, thank you guys!