Jump to content
SAU Community

Recommended Posts

  • Replies 281
  • Created
  • Last Reply

Top Posters In This Topic

None of those torque figures are accurate unless an inductive RPM pickup was put on the engine, or the derived rpm generated from wheel vs roller speed (not quite as accurate). If you have Killowatts at the Roller and an Engine RPM figure, you can of course calculate a "Derived" Torque figure, remember if you have any 2 of the 3 components of Power (HP)= (TrqFtlbs x RPM)/5252 equation the 3rd can be calculated. Mainline dynos do this very accurately with their excellent RPM pickup, but like any top level chassis dyno they give Derived Torque which is simply Torque at the Rear Wheels (or front or all 4), so essentially it's the Flywheel Torque minus Driveline losses.

If you want a torque figure calculated correctly for any of your cars let me know and I can run them with the RPM pickup in place and generate true derived torque for each vehicle. At least that way you can make accurate comparisons :)

Note when an inductive pickup is used to measure rpm on the older version of DD software that most of you seem to be posting the torque is represented as iNm rather than straight Nm to let you know its been measured with an inductive pickup :D

Edited by Martin Donnon

Yo, Adrian (sorry, I couldn't resist) guess what? Although I didn't have my GTS25t at the recent BW dyno day, not long before that day Shaun did a tuning dyno run that resulted in 302.3rwkw, and pretty much the same torque peak too.

Have I mentioned yet, that I'm keen to get the 780cc injectors fitted, HKS cams dialled in, E85 tune done and then wind the boost up? Hurry up and arrive injectors!

Looks like its got a bit more in it if you were to tweak the ignition and afr's for max power. :)

Afr's in what i would call middle of the range .8 to .85, ignition has had a little tickle, who knows how much is possible with e85, I tend to think it's a flow issue, 1. std comp cover 2. std exh manifold. I think i can discount the valve springs floating, maybe some bigger cams would help!

If you want a torque figure calculated correctly for any of your cars let me know and I can run them with the RPM pickup in place and generate true derived torque for each vehicle. At least that way you can make accurate comparisons :)

I'd be interested in that. I know someone that would be interested in Golf GT tweaking too :D

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



  • Similar Content

  • Latest Posts

    • Well, I'm tired. I'm tired because about 4PM yesterday, before today's appointment someone immediately bought my bumper. They couldn't get it any other day as they're on the way back to NSW. So I had to do that big GTR conversion I had been planning. Unfortunately, the information on SAU about what you need and how this is done is incomplete. So what should be a simple bolt on affair, yeah, it's not. Did you know if you use all GTR items the bonnet won't close? This little manuever sent me into about 1am the night before trying to dodge a way to get it closed. I will have to revisit this in the next few days  - or maybe not, I may let a body shop figure it out. It all needs to come up and my motivation to pull the bumper off is low. It also seems to hit things in the bay where the GTT bonnet didn't. Yes I used 100% new OEM GTR items. Today, I had the joy of driving to the dyno looking like this: Given I had roughed in the fuel and given sensible but pretty conservative timing, I didn't really bet on having the car drive out any real difference than when it drove in. Sadly due to a miscommunication and laptop fun and games (and almost bricking the dongle, prayers and firmware updates indeed), I ended up using HP Tuner credits to licence the car that was already licenced. So in the end my laptop was used. It turns out my butt dyno is still well calibrated after all this time. The 325kw was on 74% Ethanol, the 313kw line was on 98. The other line is the 'before' line which was 281kw. While the numbers are pretty low, they're pretty in line with what you'd expect. Even if US dynos bump the whole result up about 50KW, gaining 10-15% is similar gains.  The curve of the cam is pretty much spot on with what was discussed as well. All this said, it still feels bad to not see the number you secretly want to see. Even if the car drove great beforehand, and I knew pretty confidently the car would drive out much the same way it drove in due to the nature of a wellish dialled in LS1 not gaining much if anything at all from being tuned from where it was. As expected, the car isn't particularly sensitive to running it at anywhere between 12.0 and 13.0 - And the initial timing at 20deg and 12.0 made 308KW. So 3 degrees of timing, and leaning it out to 12.7 for 5kw, anything above stopped giving any benefit until E85 (which has an additional 2 deg as before). Car itself behaved entirely fine. I found out that 100C = 1.15V! IAT at about 7pm was 19C. I might mess with the bonnet mounting.. but given the REO NEEDS TO BE CHOPPED TO FIT A GTR BAR this is possibly something I may leave gathering (more) dust until it returns to paint jail.
    • It sounds farrrrrrr too cold at your place Duncan... Here I was thinking our 10 degrees overnight is getting cold...
    • oh yeah, reminded this morning....bin lids frozen shut too
    • In my case not, because of total reno. But yeah.
    • Did you use an electronic speedo drive? Does you speedometer read all the way to 180km?
Ă—
Ă—
  • Create New...