seen any turbo lag yet?

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I haven't been able to check out most of the videos lately due because of system issues... and I searched with minimal results.

I am curious if anyone has seen any evidence in any of the builds or videos of proper turbo lag:

- GT1 had a great turbo lag effect, but the lack of power before spooling was a bit exagerated.
- GT3 pretty much didn't have any at all: a 1000+HP single turbo monster would be at full boost before 1500 RPM....
- GT4:P - the boost gauge indicates full boost at a suspiciously low RPM once again.

please do not turn this into a debate about what causes turbo lag.
 
Not seen any in Prologue yet...

I remember in GT1 when I had a Subaru Legacy... if you didn't hold the accelerator as the camera circled round the car then you wouldn't rev it up high enough to be able to pull away!!

Also happened a bit in my build and modified Impreza... but not to the same extent!!

C.
 
None seen in GT4P - but then the cars in the game are either modern showroom Turbos, where lag has been nulified by boost levels and gearing, or full-on racers where the light-weight tends to hide any lag. It won't be until we get our hands on the full GT4 and start modifying the turbocharged cars when we discover wheher this has been remidied.

- i do hope they do have plenty of lag in the 'over turboed' Skylines/3000gts' etc
 
Thats true...

GT1 had cool boost lag, except its kind of strange how the boost lag made the engine rev slowly in neutral...

oh well, guess we'll just have to wait and see...
 
I think the engine reving slowly in neutral was the way of showing it...

One thing I will say and I've perhaps just worked it out...

With the Turbo cars in Prologue and using the external cam the rev gauge has another guage that kinda shadows the revs...

Also I noticed that the Boost gauge can vary from full boost and it slowly gets lower in some cars (Try the Evo 8 MR)... is this realistic?

C.
 
Yes. Can happen when the small stock turbo starts to run out of breath at high RPM, or when the stock exhaust & downpipe are too restrictive - this limits the velocity of exhaust gas, therefore limiting the max RPM of the turbine.

This happened in GT3 also - infact, the Audi TT's turbo is barely able to provide enough CFM at redline to provide any positive pressure at all - the gauge slowly unwinds to nearly 0 as the revs climb.
 
actually, gt3 did have lag. tune the tranny for an escudo to be as wide as possible with a high final gear ratio. turn off the tcs then run it at the machine tests or something. you'll see that it launches a couple thousand rpms before redline. i think a lot of u are basing lag on stuff that youve heard instead of experienced. just because a car runs 20+ psi of boost and makes 600hp or something doesnt mean that its gonna be slow till it reaches 20psi. if a car has 1000hp and lag, its "lag" portion is still gonna be like 400hp and low rpms, therefore it will not be a dog like everyone is saying it should be. turbos may have lag but its not like the car has 10hp and then spikes to 1000hp right before redline. have u guys ever seen a disassembled ball bearing turbo? u can spin the turbine, come back 5 mins later and it'll still be spinning. these things take nothing to spool nowadays. i definately do not want an exaggerated turbo lag effect on gt4. if u turbocharge a viper and it has lag, its not gonna become slow on the bottom end.
 
Oddly enough, I agree with you totally. :) 👍

Just because a car has a ton of power doesn't mean its going to rev up slowly. It just 'lags' before it hits big power. My Talon doesn't make full boost until about 3800rpm, but it will take off like crazy from idle. It just gets EXTRA crazy once the full 28psi kick in. Like Jr93 was saying, cars with big power still make big ammounts of power at low rpm. Its just gets bigger once boost builds. Even with only about 10-12psi at lower off-boost rpms, my car is still making upper 200hp. Thats plenty to get going very quickly. I think GT could use a little more work on making the turbo kits seem a bit different, thats all. Basically, when you put different kits on a car, it just ends up with different power levels, but almost no difference in driveability. Thats what I would like to see change.

Hilg
 
Yeah I was just thinking about this the other day. The boost gauge in all the GT series has just been a 'throttle meter' in that if would show you how much your pressing the throttle. Its impossible for my 920HP GTR to be making 2 bar boost at just 1krpm. But the turbo lag in GT1 was way to exagerated!

I also hope in GT4 they show different boost pressures for different cars. Like having a Lancia Delta S4 showing more than 'just the 2bar boost' at full boost or whatever.....

But Its a small issue I guess and I hope they perfect the car physics and include more cool cars and less bland cars and then move on to the little things ;)
 
Alright this is probably off topic but it's still about boost lag. okay so we all know that big power comes with bigger turbos but big turbos lag etc etc so why hasnt anyone used a turbo with Variable Turbine Geometry on a gasoline engine? That would be sick.
 
I don't understand turbo lag as exactingly as some people - I know it takes a while to boost fully but I don't know what impact that should have. I also don't know what 'spool' means, but it seems the difference between a stage 4 turbo in GT1 and GT3 is pretty large, and most people feel GT1 did things better. I can remember the difference in GT1 and it actually punished you for having too large a turbo on tighter tracks, which seems logical to me from everything I've read and heard.
 
'Spool' i belive is the time it takes the turbine to get spinning upto a speed where the turbo effect begins to be noticable - this time is the 'lag.' A larger turbo/turbine will take longer to spool upto speed - giving you longer lag.
 
TheCracker
'Spool' i belive is the time it takes the turbine to get spinning upto a speed where the turbo effect begins to be noticable - this time is the 'lag.' A larger turbo/turbine will take longer to spool upto speed - giving you longer lag.
Click to expand...
Kinda correct. It basically discribes the action where a turbo is 'spooling' or spinning upto the speed from exhaust gasses such that it is at the full boost pressure setting that its intended for. Lag is just the time of 'spooling' where there is zero turbo pressure and full turbo pressure. But lets not tern this into a tech discussion on turbos

In GT3 there was hardelly any difference between a stage 2 and 4 turbo unless you had a rear drive car where it would just break into wheelspin. For instance, there was little difference between my 920hp R34 GTR and my 600hp Mines GTR.
Hopefully this changes.
 
Hey I thought Grayout said he didnt want this to turn in to a turbo lag explaination thread.
 
The best way to see turbo lag in GT3 is to get an Alto Works with full upgrades and the largest turbo you can buy.
 
You also have to take in consideration that the turbo blocks the exhaust leaving the manifold, and that is actually where the performance decrease comes from. For instance, if you had a car that made 150 ft/lbs. of torque at 2000 rpm without a turbo, the torque certainly would not be the same WITH the turbo. It would be sufficiently lower. But when the revs start to climb and the exhaust flow increases, thats where the turbo makes up for it, big horsepower boost.

Now what I want in GT4 is the anti-lag system that WRC cars use, being able to buy it for a few hundred thousand credits or such. The system somehow dumps gas in before the turbo, and when the gas hits the hot manifold it combusts and keeps the turbo spinning even while you are decelerating or no throttle. Pretty slick if you ask me. That way, you dont have to wait for the turbo to spin/spool up, it's already there, ready to make power.
 
like me and jnasty have said. u guys are expecting exaggerated lag. there WAS lag in gt3. u have to realize. u guys are playing a game where u bought every mod and u have a tuned tranny. its not hard to tune a tranny so that there is absolutely ZERO lag. this isnt your car u drive to work everyday however. plenty of high hp turbo cars can spin their tires under 2500 rpms without a clutch dump anyway. u guys are expecting 1000hp skylines to drive like early 80's civics until they hit 5k rpms and then take off. thats ridiculous. just like me and jnasty have said. trust me, ive driven plenty of high boost turbo cars and jnasty owns are 2 liter boosted car. if anything, a tiny motor like that would have lag but he has said that its not really that bad. so what do u expect out of a perfectly balanced inline 6 thats 2.6 liters? if u think turbos have no effect in gt3...race the exact same car that allows n/a or turbo and get them to about the same hp number with both options. then run them around the course. i GUARANTEE u that the n/a will be quicker.
 
oh, and jim x, youre quite wrong. the turbo blocking the exhaust has no effect on the motor. as a matter of fact, restriction makes more low end torque for a motor because of backpressure. thats why nissan uses variable flow mufflers. its at higher rpms that restriction is a problem. the reason turbos can take away power is because for a turbo to run best, u should replace the cam/s. usually to change the position that the exhaust valve opens along with lift to increase exhaust velocity. this is where the engine is affected at low rpms but is well made up for later on in the power band because of the shortened spool time and higher boost capability.
 

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