Do turbo engines have engine braking? I could have sworn i heard on BTCC that they don't have engine braking? Or is that due to having to keep the turbo spooling and not letting revs drop?

Thanks

 

Turbo engines have engine braking. What you might have heard is that a turbo engine running anti-lag has no engine braking.

 

i would have thought that you will find that every car has engine braking (although i may be wrong with anti lag setups).

engine braking is:

imagine you are driving along at 50 mph in 6th gear (about 2k rpm in my car). if you let off the accelerator, on flat ground, the car will continue to roll fairly well.

imagine you then shift down to 2nd gear (about 6.5k rpm in my car - probably not a good idea to drop in to 2nd at 50mph in real life, so just imagine it...). if you then let off the accelerator, your speed will retard at a much higher rate, due to the mechanical drag of the engine components against each other.

this is what engine braking is. so although anti lag setup's keep the turbo spooled up by detonating fuel, the fuel is detonated as it is leaving the engine rather than in the combustion chamber, so there must still be a high element of mechanical drag that will cause engine breaking. maybe just possibly not to the same degree as a non-anti lag system.

however, for non anti lag systems, I can definitely say that engine braking as described above happens in every engine, due to laws of friction.

please anyone else, if i am wrong, feel free to correct me, as then i will be learning too!!

 

is it not down to the compression in the engine rather that mechanical drag ? Obviously there will be friction on the engine/gearbox/drivetrain etc but thats not what causes the slowdown, take 2 identical cars at say 50mph then pull the spark plugs out of one of them ie no compression, that car will coast considerably more than the one with compression yet they both have the same amount of mechanical drag.

You still have engine breaking with antilag, however the rpm usually rises with antilag and if you can get enough air through it would push on a bit, you do lose the servo assisted brakes tho (not usually a problem on a car with proper als due to no brake servo)

 

Must be anti lag then.

Thanks

 

Swap to a very light flywheel and then check on your engine braking LOL

Shaun

 

N/A race engine 12:1 or more

Turbo engine 8:1 so far less engine braking...

dunx

 

Engine compression plays a major part as dunx has said.