Stock Turbos Guys - How much Torque did you make in NM?

Doing some research atm and going over my old dyno graph as I prepare to finalise plans to get the car onto e85.

Looking over an old post when my car was tuned in 2011 and comparing the torque curve to others I have found it does seem really high, 730NM @4300 rpm. What did everyone else get?

Now Toshi did specify he gave me his "special race map" as I dont care to much about fuel consumption and did specify I wanted alot of torque....

A thought I have now is if the car is already producing so much torque I wonder if e85 is going to be the way to go after all, I might get a bit more top end but could a stock turbo TT really push into the 800-900nm mark? As i understand E85 really benefits the mid range where it appears strong already

 

I don?t have a direct torque measurement but I can convert from my hp graphs to torque using

Torque (Nm) = Power (kW) * 60000/(RPM*2Pi)

Doing this my peak torque when I ran 18psi was 500Nm at the wheels on the UAS dyno (based on 220kw at 4200rpm)*.

And I have one of the more powerfull stock turbo Z32s around.
Now UAS reads pretty low and although a car typically looses 20% through drive line UAS reads more like it?s a 25% loss (John has stated to me its 25% for his dyno and it matchs eg stock 223 kw Z32 reads 167 ish at wheels on Johns dyno). So lets be generous and assume that is the case. Even then I would only have 667 Nm (=500/0.75) at the crank. So yeah your value is high especially for at the wheels (its high compared to me anyway) ? if you are at 18psi or less.

Now the stock turbo compressor map I posted in the other thread shows stock turbos can briefly run 24 psi at 70% efficiency.

So let?s say I run my stock turbos at 24 psi (as it happens I do or at least that is what I believe rightly or wrongly that my manual boost controller is set to i.e. 18 psi + 6 clicks of Turobsmart boost T).

Then the increase in air delivered (at the same efficiency) at 24 psi compared to 18psi is
= (24 psi + 14.7 psi)/ (18psi + 14.7 psi) = 1.18

Thus for my car the predicted torque at 24 psi = 1.18 * 667 Crank Nm = 787 Nm at Crank at least that?s what I fantasize, I haven?t measured that on the dyno (mainly because I am worried any dyno operter seeing me run stock turbos at 24 psi will have a heart attack and try and detune it).

Whether or not I personally am running 24psi the fact is stockers can run 24psi at 70% efficiency (if your motor can handle it). The Z32 can put out 667 Crank Nm at 18psi ? mine does (though that is probably extreme). So in theory yeah a Z32 with stock turbos can get close to 800Nm (for the narrow RPM range it can hold 24psi for). I run a lot of boost and little timing. Its conceivable you might make more power on less boost and more timing. So maybe someone out there can hit 800Nm. I doubt you can go much over it without Ethanol.

The thing is being able to make 24psi on stock turbos and not blow up your engine. Ethanol should be better at that. Ethanol should allow more timing to add to that boost. Ethanol would allow a lot more timing than I run I think. So maybe with Ethanol you can push into the 800 ? 900 Nm zone but probably not without it.


*Both my 271rwkw@ 18psi tune and my latter 230 rwkw@18psi tune which is the one I turned up to 24psi have this same power/torque level at 4200 rpm.

 

i think you are seeing 700 newtons. not NM. newtons on the dyno is tractive effort or something.

need someone more dyno knowledgeable than me to expain

 

i doubt very much your motor is ever seeing 24psi. and it does not matter anyway. on your dyno chart that showed 270kw that was actually made at 15.5 psi.

tonnes of boost on stock turbos is not the way to go without e85 or meth injection. it does not make power

 

Tractive effort is an order of magnitude larger than torque, my 10psi run made >5000N, can't remember the formula but I calculated that to be about 450Nm with a TT diff in fourth gear.

 

Very true. With any luck I'll get into the snowy 1000 later in the year and see just how fast.

 

This take your dyno set your timing and show me how fast it goes

 

Well as long as you're asking here is a diagram I prepared to explain Tractive Effort

 

Just checked its NM

 

Yeah I'm becoming less interested in Dyno numbers every day that goes by. Back when we did the Dyno days it was as much for comparison between cars as anything else which was cool

 

just being a pedant but it should be Nm, N is newtons m is meters, n is nano and M is usually either Mega or Molar (concentration). Just because I see people use every combination of the above and want to correct it at least once. I do find it a bit weird that meters didn't get a capital letter though.

 

http://www.aus300zx.com/forum/showthread.php?t=314288 - here my post from 4 years back with the sheet.... trying to remember my photo bucket account name as I had a video of it which is much clearer....

 

I guess I care more about SI units than I do grammar, I think its something that plenty of people wouldn't actually know so thought I'd just throw it out there. You should see me when I read a nutritional information table with Mg or worse yet people that make up their own short hand like gms. I'm probably a bit off topic now... I promise I wont become the forums units nazi.

 

Heil correct SI unit notation!

 

:br: 590 RW. n @ 3400RPM 13PSI Boost on 98 oct.:zlove: