Jump to content
SAU Community

Recommended Posts

  • Replies 43
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

When you're tuning you hold on every cell to see what's happening then make adjustments. Doesn't matter how long it takes the exhaust gas to travel as you adjust by cell on constant load. Unless you're a wizz and can make changes in less than 3 seconds. (some tuners would have you believe they can)By the way, 3 seconds ? Ahh, NO. Only if at boost you have a 25mm exhaust.

Learn to tune your own car so you tune for every day over a period of time rather than the hour your car is on the dyno. The weather changes, fuel, heat and engine condition. If your motor blows it may be that these conditions changed and the tuner actually got it right only at the time it was tuned. I think Nismoid is about to tell you how rediculous worrying about the time frame of the exhaust travel is. Shhhh, here he comes, let's see if I'm right. :yes:

This is why I run my wideband in my tail pipe. If the tuner likes, they can compare the ratio with what they are getting at the muffler but surely most would know there is some delay from what just came out of the manifold to what is being shown at the tail pipe...

Havent you seen the tailpipe squiggle lines on Initial D and Wangan? That means the gas is travelling very fast.

3 seconds would not translate to squiggle lines IMHO.

I think Nismoid is about to tell you how rediculous worrying about the time frame of the exhaust travel is. Shhhh, here he comes, let's see if I'm right. :yes:

Well if Motec and Ford seemed to think it was enough of an issue to measure it and adjust their tuning to suit, then I'm going to guess it isn't ridiculous.

Well if Motec and Ford seemed to think it was enough of an issue to measure it and adjust their tuning to suit, then I'm going to guess it isn't ridiculous.

There goes all credibility right there.

It wouldn't be the hardest thing to calculate a rough figure of the time if some one knew how to do it for a turbocharged engine.

Going off of very rough calculations I did with simple figures for a NA engine (2.5L engine at 1000RPM) I get around 4m/s out of a 3" exhaust - so around 1 second of travel.

That's just using some basic engineering formulas I can remember.

Would love to see some one elses complete working equations on it though, would be quite interesting.

I'm just not 100% sure on how above atmospheric pressure (boost) effects the formulas with an exhaust housing slowing down the airflow?

Just because one person at a company says something that doesnt make it the official company policy/opinion.

But it gives some credibility to asking the question and doing testing to see what the result is, it also doesn't give you guys a reason to be cocks about it.

Furthermore, does this mean most of us now need to go and retune our cars as were probably tuned 3 seconds out?

Does this also mean I will shave 3 seconds from my 0-100?

That would mean some of us will be defying physics.

You should start a thread about defying physics.

Would be curious to hear STATUS' opinion on this.

trent tunes cars with both methods. depends on the application... he said it makes fuckall difference :)

No but I would suggest you get a class in english comprehension : p

So I can impress people on forums. I'll get right on that.

Then I'll use my 'new found' literary skills and talk about reinventing the wheel on SAU. :wave:

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

    • Drain it. I got official Matic D but you can get whatever is listed as Matic D compatible.
    • Thanks guys,  Yeah I should at least have them dynoed, at least then I know what I've got as a starting point.  The springs on these are hard as rocks. I vaguely remember Russman saying he was going to sell the shocks to me with the rocks fitted, as he was keeping the softer springs for his new setup.  I didn't click at the time but of course that was to let me know the shock/spring wouldn't be matched.  I also remember pricing up new springs around 2014-15, but, house, money etc. it never happened. So that was another reason to have them rebuilt. I have rebuilt the forks on many motorcycles so I think I could handle the seals on these easily enough, but getting the valving right would be a rabbit hole I cbf exploring.  Duncan, interesting to hear RP was tuning these back then. I might give them a call.  In the mean time I have been busy fitting sway bars. The Whiteline rear sway bar I purchased 15 years ago finally got fitted, along with the Whiteline front bar that showed up last week. Just waiting on new links for the front sway bar to finish that off.  And my spare set of advan AVS VS5's should be back from the powder coaters in a Pearl White finish sometime this week, with a set of Hankook RS4's lined up for fitting.  And then I just have all the suspension bushes to do. A comprehensive kit is on the way... Lots to do before the Ararat hill climb. Cheers guys 🍻   
    • Nice car! I’m glad folks in the US have gotten past the FnF and are buying real cool cars like the 260RS I was with a bunch of mates in Portland about a year ago and spotted a green Stagea (just a regular 2.5T AWD) parked about 2 blocks away and they were like “a what?” So I made a bet with them for a round of beers and said “ok one of you run down there and tell me if the steering wheel is on the correct side” 5 mins later the American comes trudging back up the hill and goes “he’s right guys. Ok what beer do you want?”
    • Should replace OR drop the tank, give it's good clean. Might be worth replacing that entire fuel level/pump/cradle thing with this: https://frenchysperformancegarage.com/products/fpg-s13-180sx-r32gtst-single-pump-hanger-kit-billet-hat-6-v3-fpg-089?gQT=2  
    • Thank you so much for the help
×
×
  • Create New...