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Flattest Torque Curve?

rtune

By rtune,
in Engines & Forced Induction

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rtune Experienced

rtune

Posted
Posted

What mods support the widest, flattest torque curve on an rb 2.6 tt?

Or to put things another way, what mods tend to combat torque roll off

after it peaks at 4600 or so?

there is a long way from 4500 rpm to 8200 rpm, after all, and I see most

dyno plots torque rolls off quite dramatically.

I'm not asking from the start point of any specific setup, except I already

know that increasing displacement and dialing back boost is the easiest solution,

wondering what tricks there are for 2.6

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rtune Experienced

rtune

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Posted
it doesnt drop off.. it actually continues to climb lol

stock cams.. i think its turbo selection :P

thats a flat torque curve as far as it goes at least -- did you figure out what you have that isn't stock yet?

in particular, what your turbo is? maybe I didn't look through your post history well enough but

you don't seem very sure!

Bumblebee Experienced

Bumblebee

Posted
Posted

well i measured the turbo up and the comp wasnt stock.. measured 66mm instead of i think theyre suppose to be 61??

so its slightly larger.. the rear end was still ceramic.. and hence the rebuild..

the rest is stock.. ive got the motor in pieces now.. stock everything else :)

STATUS Grand Master

STATUS

Posted
Posted
img015416j0007mu6.jpg

have a looksi :)

problem is the way those dyno's guesstimate torque, they really dont give an accurate idea... lots of wheelspin though too so i would probably a bit more up top. Nice power for an unknown owner you must have been very happy :down: it not often you get more than you expect.

Russells is pretty much accross the way and does great work especially on V8's. I've noticed average thier dyno reads a bit high compared to mine and Dyno Dynamics so i reckon R33 GTR turbos would be a good guess at whats on there.

Beer Baron Grand Master

Beer Baron

Posted
Posted

the power curve looks a bit funny to me. quite a slow climb. for instance my GTR just tuned the other week. at 4500rpm you are at 175kw i'm at 220. at 5,000rpm it makes 250kw, yours is on 200. at 5500 you're on ~230 i'm on ~280 and yet we both make about the same peak. but basically 50kw more everywhere else.

I don't have my torque curve handy but it should be pretty good. you can see this style of 300kw has lots of area under the curve which makes it fast on the street (and the track too).

post-3621-1214963736_thumb.jpg

Bumblebee Experienced

Bumblebee

Posted
Posted

odd i know.. my turbos were very laggy :D but they had a lot uptop.. if only they did the turbos properly..

instead of just puttin a large comp wheel on it, they shouldve put steel wheels too, then it woulda seen well over 300awkw easily

it was only on 15psi :P i ran 18psi most days till they died

Ryan1200 Proficient

Ryan1200

Posted
Posted (edited)
Gotta love dyno dynamics "adjustment" FTW

This was done in shootout mode actually. The corrections are on this sheet so no funny bussiness..

Have since done somemore tunning on a brand new 4wd dyno with some vp109.. 545awhp was my 98 tune... It has run hi 10's but with crappy 60ft 1.99 then got booted cause the lack of safety gear..106mph 1/8 133 terminal so if i can get 60ft times down times should come down a far way. The car is as nissan sold it so theres nothing removed as yet.. As i said 2530's ftw.. :sick:

post-20010-1215001084_thumb.jpg

post-20010-1215001765_thumb.jpg

Edited by Ryan1200
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

545rwhp on realistic fuel is more like it.

Posting a graph on race fuel/NOS whatever, without telling people that doesn't help, nor did it add anything to the thread .. plus the IT temp of 50 degree's is adding some nice correction to it all :whistling:

People just assume PULP, as that's what you get from a servo.

Running 109 octane is a TOTALLY different kettle of fish

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