Jump to content
SAU Community

Recommended Posts

  • Replies 250
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

this is where its @

engine dynod first then into the shop on the dynapack.... no bullshit "roller derived tractive effort" figures... just look at the torque (cold hard real torque).... i can tell you now nothing compares to driving something with this much horsepower and torque... and this is a daily driver, that returns 10-14l/100km

So what you trying to say here is the engine dyno gave the same results as the dynapack?

Or are you just flexing your e-wang ya show off...... :D

Ok so assuming a 1000rpm drop of changing up gears, when would you change gears on this monster car?

If your about torque then I would predict just above 5,000rpm and if your about power then around 6,500rpm.

Ok so assuming a 1000rpm drop of changing up gears, when would you change gears on this monster car?

If your about torque then I would predict just above 5,000rpm and if your about power then around 6,500rpm.

Well if you thought that torque was the key to a fast car you would shift to maintain max average torque over the rpm range, and do the same for horsepower, obviously shifting to maximise max horsepower over the rev range makes a car faster, not peak torque.

You must read this thread: http://www.allpar.com/eek/hp-vs-torque.html

I think that solves all the issues.

we have already come to a conclusion and I believe everyone is happy they understand it, to maximise performance you want to shift at peak power and keep peak power under the curve, not peak torque under the curve, are you saying this is incorrect?

edit: that link says the same thing, so I'm assuming you are in agreeable with everyone?

Edited by Rolls
we have already come to a conclusion and I believe everyone is happy they understand it, to maximise performance you want to shift at peak power and keep peak power under the curve, not peak torque under the curve, are you saying this is incorrect?

edit: that link says the same thing, so I'm assuming you are in agreeable with everyone?

Yup I am agreeing. I just think its a really good comprehensive explanation of it.

  • 2 weeks later...

That was an awesome explanation of the problem.. its funny how he summed up so many points me n rolls covered.. with the whole cvt etc,

and this bit

"Hmmm... P = F * V ...rearrange to get F = P / V ...

that means that you get the maximum force pushing the car if you maximize your *Power* at any given velocity. This gives us another useful rule:

Shift to maximize engine POWER, not engine torque!"

funnily enough i had to use all these formulas for my exam today, except i had to calculate the maximum power i could get a car to produce at 80kmph and the equivalent engine rpm with different gears and the diff, subtract the drag power loses, then calculate the maximum hill gradient the 1800kg car could cruise up, P=mg sin(hill angle) * velocity ftw :thumbsup:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Latest Posts

    • I seem to the be only person that is using a Haltech 2500 on an NA motor, I've installed a Bosch DBW throttle body to the OEM intake manifold and am having problems maintaining AFR even with the wideband o2.  It will run extremely rich at idle and up to redline, but under load it will go extremely lean in the 20s and i'm essentially having to rev it over 4k and feather the clutch to get it up to speed.  I've read a few other threads of about the butterfly, it seems removing the vacuum to it is supposed to have it remain open, i've noticed no difference under 4k with the vacuum line to it plugged.  I'm hoping someone here has had luck using the NA manifold with Haltech, and if they happen to have a tune for it.  
    • I don't know any details, but I really wouldn't be surprised if they do it as a LHD only version, at least initially.
    • Thanks for the replies everyone. Definitely a coolant push. Oil catch can is empty and always has been. As the engine is out now I'll be having a good look over things. I do have some detonation on the piston tops from a trigger issue back about 5 years ago. I felt it and shut off then bought a new ecu and changed the trigger. Never been an issue since. It never hurt the power, its made almost 80hp more since that incident but I will pull the bearing caps to take a look. If the bearings are damaged I will do a bottom end refresh. Head is being re conditioned at the moment and the block will be cleaned and checked to ensure it's flat. I'll go with a kameari gasket and see how it ends up. The other thing I'm not super keen on is the cylinder colours. I suspect this is from the inlet manifold. The plan will be to put it back together, retune and then stick a plazmaman billet inlet on it and retune. I'm happy with the power, if it makes a little more, then great, but I would rather just make everything more efficient at this stage.
    • Maybe they'll look to do a bunch of presales to help inject some cash fast for their financial issues...
    • Does it also misfire equally when revving?   Josh is very correct in what you should do. The coilpack harness wiring loom itself is a known problem due to its age and the number of heat cycles it has gone through. Throwing parts at a vehicle to diagnose the issue isn't a smart or good way to do it. Secondly, you may have a bad coil pack, you pop replacements in, they fix that issue, but messing with the harness breaks it, so the issue persists. So now you think "well it wasn't the coil packs" and have to continue chasing your tail, potentially swapping back in your shit coil packs and returning the good ones (yes, I've seen people do this because 'it wasn't the problem' and they want to save money). And suddenly, you've got two issues with the same symptoms...   Diagnose, don't use the spare parts shotgun.
×
×
  • Create New...