Too bad you weren't able to do it on the stock motor, I would have liked to see what numbers you could have pulled. A built motor on the same peak power level won't really be comparible if you have heads/cams, valvetrain work done since it's going to change the power profile on the top end, making a comparison with a stock motor on boost pointless. I assume you'll probably be upgrading your turbo too, no?

 

Yes I know, its not really a fair comparison but will give an idea of what it could have done. Too bad I never got around to tuning it for more power oh well I know of a guy with 400whp TN car that (I would assume) in ideal conditions has trapped 118mph. Im looking into upgrading the snail and a few other things, with the block Im building it truly would be sad to only push 500whp or less. I will upgarde eventually but at the time of this build Im not sure yet. So much $$$$

 

It takes more than 30whp to go from 116-120mph. The other day it took 3.5psi of boost and opening my exhaust cutout to go from 116mph to 120mph through the traps. That's more like 75whp, probably more actually with the opening of the cutout. 30whp would not raise your traps 4mph in a car already making 400whp, not a chance (given the same DA, etc).

 

Its dumb to really argue "what if's" but my car ran 116mph in 90 degree heat. At a slightly quicker track in MD (where I ran my best NA time), on a cool night at the same power level Id guarantee 118mph traps, now give me 30whp more and I dont think 120mph is out of the question. 23whp NA raised my trap 6mph down the 1/4 do you not believe that to be possible as well?

 

Given the same track and weather conditions ("same DA") was crucial to my post. Getting better at driving, running at different tracks, etc does not fall into that category. I don't have any difficulty believing what happened when your car was NA because mine made an even more dramatic improvement. All else remaining unchanged, a simple addition of 30whp is not enough to propel a 400whp car another 4mph through the traps in my opinion.

 

Here is a dyno chart at 15psi on stock spark plugs and a 8.8:1 compression motor. As you can see it is very linear and but the catch is that it makes power up top, and down low is where it is sloppy. But the car up top makes a great amount of power and very effiecent.

 

You're all missing the point here.

Concerning the quarter mile its all about traction and the manner in which both setups build boost. Twins make enough power in the bottom range to severely hurt your launch unless this is overcome by sticky rubber, suspension, and driving skill. With the single turbo this is still a problem, but less of a concern due to the manner in which the kits make power. This is why experienced and non-experienced drivers alike have been matching or beating ET's of drivers with TT setups with more power.

By default the TT systems are more efficient, especially at low boost levels, so of course they will be hitting higher trap speeds on the stock motor.

And to the above poster with the supra dyno, if you compare a ST supra to a ST Z then you have no idea...

 

Taurran thats my dyno, lol

 

Not yours, heh. I was referring to this post:

https://my350z.com/forum/showpost.ph...9&postcount=19

 

I'll take a high trap car over a low ET any day.

 

^^ What have you trapped Im curious....

 

Haven't ran her yet. But so far I've ran a 118 car and pulled and a 123 car and kept up. I'm somewhere in that ballpark.

However theres a guy locally that just got his TN kit bolted on his Z and is dying to run me.

So Look out for videos in the near future.

 

Very hard to judge by that, Im sure you know a slight jump in a 115mph car could hold off a 118mph car for a while....let us know how you do at the track, most APS TT's I see trap very high-the ones that can drive at least

Edit-btw if your tuned and are going to race a guy who just bolted on his TN kit, you'd better whoop his a$$ or your car is slow

 

Tune for tune, TN is tuned out the box, just my EMS isn't lock.

 

Yeah Im sure you have over 420whp tuned vs an out of the box tune(weaksauce)-sure sounds fair, about as fair as me busting your a$$ down the 1/4 while you spin your street tires and watch me pull away(on slicks) Seriously though post the vid I always like to see Z's racing

 

Chris you need to take that car to the track.

 

I haven't found too many TN ST dyno graphs, but they all seem to peter out on the top end. Is this because of the the restrictive stock manifolds and all the small piping to fit the ST high and up front in the engine?

The torque curve is not very exciting. it looks liek a mountain...very steep on both sides of the peak. I can understand the steepness going up the rpms, but then it seems to drop off way too fast after 4500 rpms.

 

Torque curve not exciting? I think mine is pretty exciting compared to many of the TT stock motor dynos I've seen. By the way, I'm on the reflash. Hopefully by this winter I'll be tuned.

 

300ft/lbs before 3000rpm is awesome for any ST. Over 350ft/lbs from slightly after 3000rpm-6000rpm's isnt enough for some people? Lol...Great curve.

 

tarraun,

you have probably the smoothest looking graph out there for a TN kit.

What I meant was it seems like thee are alot of graphs showing a later spollup creating a very steep torque curve, and then a very steep decline after the peak. That isn't a good trait.

Even on you car, you are peaking at around 5700-5800 rpms. Isn't that about 500 rpms lower than when N/A? Shouldn't your car still be increasing in power, like t was when N/A? or, is boost dropping off a bit?