What exactly happens to engine when you tune it?

[Peskarik]

Know almost nothing about cars.  :embarassed:
Never too late to educate myself, though.

Question 1: What exactly happens when E.30 engine is tuned to 300bhp (just the map). I know words like "boost", but in layman term, what does tuning mean? Turbo rotates faster or something?  :embarassed:

Question 2: When I drive and the engine is not fully warmed up yet (water is not up to 90 degrees), if I go above 3000rpm (in 2nd and 3rd gears) the engine sounds very coarse. I started noticing it after the map. WHen it warms up, it is OK again. Anyone noticed? What could it be?

[garethmk1]

And you were questioning my advice in this thread http://www.golfgtiforum.co.uk/index.php?topic=93476.0 ?? 

[R32UK]

And you were questioning my advice in this thread http://www.golfgtiforum.co.uk/index.php?topic=93476.0 ?? 

That is this thread...

[182_blue]

[bacillus]

 

[Peskarik]

And you were questioning my advice in this thread http://www.golfgtiforum.co.uk/index.php?topic=93476.0 ?? 

To question things - that separates us from the sheep.

[Peskarik]

not very instructive.
I appreciate the "joke", of course.

[chungster]

Question 1.

Remaps on turbo charged car mainly results in increased boost pressure and fuelling.
This means more more air is therefore compressed and forced into the engine. To match this more fuel is put in as well, to make sure the air/fuel ratio is such that it produces a bigger bang than in standard mode.

bigger bang = more power/torque = more fun = happier drivers!

Question 2.

many people watch the water temp gauge to get to 90 degrees before giving it some welly.
however, what u REALLY want to see (and u can't unless u have another gauge) is the oil temperature.

water heats up faster than oil does. so even when the water temp gauge hits 90 degrees, oil temp may not be.  oil helps all the metal bits move efficiently with minimal friction. oil also goes to the turbine shaft on the turbo....and giving it some welly and running full boost when oil hasn't warmed up can reduce the life of the turbo significantly.

in any case, wait for TT to come along to explain 

[Hurdy]

Just to add a little to number 1. More power comes from more pressure, but a side effect of this is more generated heat. That is why I had the intercooler to help keep things in check.

[RedRobin]

many people watch the water temp gauge to get to 90 degrees before giving it some welly.
however, what u REALLY want to see (and u can't unless u have another gauge) is the oil temperature.

water heats up faster than oil does. so even when the water temp gauge hits 90 degrees, oil temp may not be.  oil helps all the metal bits move efficiently with minimal friction. oil also goes to the turbine shaft on the turbo....and giving it some welly and running full boost when oil hasn't warmed up can reduce the life of the turbo significantly.

....And in the absence of an oil gauge and having waited for the water gauge to display 90, about how much extra time would you suggest we allow for the oil tto be likely to be warm enough?