Hello:

With the current used prices for turbos I am thinking of picking one up (vs a C4S), probably a 2007. Anyway, recently I drove one and found that putting my foot down at 1500rpm the acceleration was 'just' moderate, by 3500rpm (and full boost) the acceleration was fierce . Is the difference that dramatic? Also the boost gauge was slow to climb (1+ seconds from planting my foot). I thought the turbo was supposed to have very low lag.

Also, when on full boost in 2nd gear, dry roads, 50F+ temps, good tread on the tires, the car also appeared a bit light at the front and less planted. There did not appear to be any traction control kicking in it just felt a little skittish.

Is this normal? I only have a sample of 1 turbo I have driven.

Cheers,

Stormeister

 

The normally aspirated car has a completely different drive . Since its light and two wheel drive there is this sensation that 1st and 2nd feel quite fast . The Turbo has this slight pause and then BAM ... With Turbos spooling it's almost like a low level flying experience as the sound pressure wave is being homogenized by the Turbo's impellar .

The biggest gap occurs in third gear and beyond where the normally asirated car weakens and the Turbo thrives -especially with mods and software . Plus with AWD the overall flickability of a Turbo may feel less engaged compared to a Gt3 but straight line its no contest .

 

My last two cars have been turbocharged, but from what I had read I was not expecting such an on-off characteristic.... it almost reminded me of an old Saab! ... it did put a huge smirk on my face when it kicked in though!

Daniel

 

The stock Turbo has a more significant pause plus it lacks the mid range punch that can be accomplished with just software and exhaust.
The real jump comes with intercoolers , intake, plenum but the car takes on a whole new level at the EVT 700 .

It becomes more seamless and of course a Turbo is not a normally aspirated car but the lag is so greatly reduced . Furthermore the throw back into the seat has this face smearing snap and it does not let off in 3rd, 4th , 5th .. .

This video below shows two modded cars (gt3 vs 997tt) yet it's not a 700 . Notice in the drag race how the they stay somewhat even and then it just pulls (fast forward to 5min 6 sec)--that third gear . BTW a 700 car will pull from it even in 1st gear and it refuses to let off . So it just keeps going at this amazing increasing linear rate.

http://www.youtube.com/watch?v=QAxksl0fIUo

 

If you want your face pulled back floor it at 3000+, at 1500 you arent near where you need to be in either torque or hp.

Another thing to consider is that there is a difference between being completely off the gas and coasting and then flooring it (no exhaust pressure prior to flooring)
VS
Being on the gas somewhat so the car is accelerating and then flooring it (some exhaust pressure already there so it will spool a bit faster).

From coasting the car will pause for a second before the boost kicks in.

 

+1 -This would be a great thread topic on boost and momentum .
Quite often one sees a rolling start where the Turbo backs away and then flys by and I also feel that many of these posters who have normally aspirated cars claiming that the beat a Turbo won on momentum and limted space .

They may not realize that the normally aspirated car has a great bark but no bite .

 

I dont think that is entirely true.
The new direct injection s is fairly quick ...in almost any gear.
The only thing is ...it sucks to wait for power to kick in.

 

Let me clarrify "bite" . The 997S is a great car . In fact as a daily driver and factoring in price it's quite a value . I had two of them ( an 05 and an 07 F77 car) and the DFI has even more to offer . The car has an immediate throttle response and is very fast yet the drive is very different from the Turbo where boost sends it hurling like it was shot out of a sling shot . With modifications its even MORE pronounced .

My EVT700 differs from a stock Turbo with reduced lag but it also pulls hard even at the upper RPMS into the next gear . With momentum and spool it simply plasters the driver to the seat wheras the normally aspirated cars simply can not do this. The NA cars respond with no pause (bark) but let off at the point where the Turbo picks up (bite).

Ultimately I would like to have both cars because they are so different .

 

thanks for clarifying...makes a lot more sense. I believe I would agree with that.

 

Is there anyway to brake boost the TT? I tried a while back, but the traction control kicked in and cut the fuel. It did that even when I turned off the psm.

 

You can certainly left foot brake to keep the boost up on the track, but doing that from a standstill doesn't sound like a good idea.

 

I was trying it from a roll, but the car cuts fuel after about a second.