Enormous turbo lag/ really high boost threshold

  • Thread starter Thread starter Not_A_Guest
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Oh, I was merely making a light hearted comment that not all turbo vehicles require you to get in the throttle prematurely, the way it was worded suggested that was the case, which of course it isn't. My turbo is fairly responsive, so I don't generally get on the throttle any earlier to offset it.
 
Punknoodle
Except the bit where you say that in turbo cars you accelerate before you would in an N/A vehicle to anticipate the boost response. This isn't always the case - I've been in quite a few high capacity turbo vehicles and the throttle response off boost is just as savage as a lot of N/A vehicles! The turbo just adds another level of insane on top, one that you had better he aimed in a straight line for!
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It depends on the specific setup and the specific corner. The 917/30 (1,100+ horsepower in race trim, nearly 1,600 hp in qualifying trim) was notorious for lag despite having lots of power. Period interviews with Mark Donohue included Donohue discussing the process for driving the car and mentioning hitting the gas well before the point where he wanted full power to account for the lag. And this was a car that probably had 500 or 600 horsepower without the turbo.

The 917, of course, was early turbo tech and a lag monster. My 951 is much more modern (the engine is currently set up to surpass the specs of the 1991 951S) but still has a low-compression/high boost setup, which tends towards more lag. I'm also generally able to go full throttle earlier since the 951 is a relatively low-power vehicle (as trackday cars go) with very sticky tires, so the off-boost power is never enough to overwhelm the setup.

That said, even the best and most modern systems still have some lag and on a track, to get the best times, a driver will still need to anticipate that and begin throttle tip-in sooner, even if it's fractions of a second, in certain corners. But, as you very correctly point out, this is definitely not the case in corners where the engine's lower off-boost power will still be enough to overhwelm the available traction. :)
 
Cars like the Ford GT40 road car (old model) or the Suzuki Escudo Pikes Peak, those have some huge turbo lag high boost threshold!
 
NixxxoN
Ford GT40 road car (old model)
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This thread forgot how to thread...
 
shirakawaa
I believe the latest 1.04 patch might have at least partially solved this.
Turbo cars feel different than before, with a more sluggish engine response.
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Was just testing a FTO that I just installed a turbo kit, the engine response really feel different. :)
 
shirakawaa
I believe the latest 1.04 patch might have at least partially solved this.
Turbo cars feel different than before, with a more sluggish engine response.
Click to expand...
After some more testing I'm afraid I might be mistaken here, or in other words that nothing changed with 1.04.
The "lag" seems to be largely due to the throttle response when using a DS3.
Either this only some cars seem to have a limited amount of proper turbo lag.
 
Okay, I think I got it. Boost threshold is the amount of time it takes for the turbo to spool up to a efficient speed, i.e. what many people mistaken for "turbo lag" in GT6. Turbo lag is the time for the turbo to actually spool once it has reached boost threshold. I think Tsuchiya's quote here at 2:53...



...shows exactly what is missing in the game:
Keiichi Tsuchiya
NA engines will respond to the slightest movement of your foot on the gas pedal. That delicate touch is unique to the NA.
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Turbo lag is almost like a delayed throttle response from what I'm getting.
 
shirakawaa
After some more testing I'm afraid I might be mistaken here, or in other words that nothing changed with 1.04.
The "lag" seems to be largely due to the throttle response when using a DS3.
Either this only some cars seem to have a limited amount of proper turbo lag.
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So, there must be something different with DS3 input? I play with DS3 too and felt a little bit more sluggish.
 
diegorborges
So, there must be something different with DS3 input? I play with DS3 too and felt a little bit more sluggish.
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Even by instantly flooring the throttle in GT6, it takes a short while for the game to actually raise the throttle input to 100% when using a DS3. This supposedly helps throttle control for beginners, at the cost of added engine response delay. To a limited extent, drive-by-wire electronic throttle control systems in real life act this way too, to increase driving comfort and reduce emissions. In GT6, it could be that with v1.04 this was made even slower than before to help beginners more, since most of them would be using a DS3. However, if you don't press the throttle all the way down you can make the actual thottle input increase increase faster in-game, and by doing so I don't think I'm seeing more turbo lag than usual.

As I said, either this is what happened or only some turbocharged cars seem to behave differently than usual.
 
shirakawaa
Even by instantly flooring the throttle in GT6, it takes a short while for the game to actually raise the throttle input to 100% when using a DS3. This supposedly helps throttle control for beginners, at the cost of added engine response delay. To a limited extent, drive-by-wire electronic throttle control systems in real life act this way too, to increase driving comfort and reduce emissions. In GT6, it could be that with v1.04 this was made even slower than before to help beginners more, since most of them would be using a DS3. However, if you don't press the throttle all the way down you can make the actual thottle input increase increase faster in-game, and by doing so I don't think I'm seeing more turbo lag than usual.

As I said, either this is what happened or only some turbocharged cars seem to behave differently than usual.
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Yes, exactly... I was playing last night with a turbocharged Diablo, the power delivery was different... like, the turbo gauge fills almost instantly then it takes a bit for the power to come out. Pressing the accelerator multiple times I could keep it more "full" on the powerband. Don't know if I'm explaining this with the right words... it just felt a bit more slow on the power delivery.

Same thing for a pretty much stock FTO. Stock, just installed the high rpm turbo kit... the car was almost dead in low rpms... well, in it's stock form it's a high revving engine so that must be normal too.

Anyway, thanks for the testing and talking about the subject. I'll drive more and see what else happens. It must be placebo too... we always get a bit of that after each update.

Proper turbo lag would be amazing.
 
Heck, it could be as simple as programming a multiplier to acceleration that progressively scales or descends at a level that's proportional to the driver's throttle input.

The speed at which the multiplier adjusts would depend on the turbo size. Big turbo = slow adjustment to multiplier.

It may be a large simplification of the way a turbo works but at least there would be true turbo lag.
 

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