Recently had my car RR'd now I have put a fair few miles on the engine. Pleased to find out its made a few more ponies and torque at a bit less boost.

I have a question though.

The torque tails of quite a bit through the rev range. Is this normal for a rs turbo?
It makes 202Ft Lbs @3500 but by the time its at 5500 this has dropped to about 170FtLbs.

The car drives lovely and the fuel map looks like its been drawn with a ruler which is always a nice piece of mind with mfi, I'm just curious as to why this happens?

Cheers.

 

That's just naturally how a engine works. If you look at the bhp and torque against revs. Working from torque x revs / 5252 = bhp

So, if your torque kept climbing with revs then so would power, but. Your engine might make 200bhp at 6000rpm so torque has to fall with revs.

Hope this isn't confusing as its late and I'm half asleep

You also need to look at boost, as with turbo engines it's easy more boost = more torque, therefore power.

Soy our peak torque may have been at higher boost than the higher rpm points making the drop of torque more apparent.

In basics it's just how it is and nothing to worry about

Jim

 

So you have 135bhp at 3500, and 178bhp at 5500' that's perfect fella, like I say just torque falls away with revs.

I'm guessing a standard engine at 10-12psi?
Can't beat a rs turbo on a .36 exh housing for nipping about in, nice low down power

 

ahhh I see. It is late but that about makes sense.

Just seen it on the graphs and never really put any thought into it.

Yeah that's about right, although I think my peak power was 170bhp @12-13psi. (cant find the bloody graph now! )
Yeah standard engine, nothing special but just got it to around the 10,000 mile mark.

 

That's bang on, we do 190 and on a good engine 200 conversions at 1bar boost

Wow just read that back, little confusing but helps you get the idea of torque has to fall away at some point.