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Showing content with the highest reputation on 03/15/2019 in all areas

  1. 2 points
    So I got the coolant bled to a point where I could drive it without overheating and run the engine in for 100km. Installed a GFB G Force 3 boost controller on a little bracket I made up that fits in the vent. I can monitor AFR later on when I put another sensor in and protect the engine incase it leans out. So many cool features with this unit. Also had a mate dip the grill in carbon fibre. Came out really good and matches nicely with the ARX kit.
  2. 2 points
    This is surely a troll of epic proportions. Is it school holidays again?
  3. 2 points
    You are thinking about it wrong. NA engine cylinder inhales 1x swept volume per intake event. Ignoring volumetric efficiency of course. Put turbo onto engine, running 1 bar of boost. Let's ignore the effect of increased exhaust manifold pressure for the moment. That turbo'd cylinder still inhales 1x swept volume per inlet event, but now that gas is at double the density. Twice as much mass of air gets into the cylinder. And the ECU has to chuck in twice as much fuel to go with it. You now have twice the energy (from fuel) released during the combustion event and hence twice the power. It is THAT simple. (Except that it is not, because of the various confounding factors, such as EMP, differences in cam duration & timing, static comp ratio, charge temperature, that all add up to drop us below a simple doubling of power. But we still go up towards double the power, just because we're chucking in double the amount of fuel). All the compression ratio does on top of that is make it possible to burn the stuff the way we want it to and get the mechanical force out of onto the crank. If you have a turbo giving 1 bar of boost, and you have an intercooler that brings it down to near ambient (so we don't have to consider too much extra heat coming along for the ride) then you can compress the charge at nearly the same compression ratio as you would in an NA version of the engine, because the temperature rise associated with the compression event depends on the ratio of P2/P1, not simply the final pressure. In practice, we still need to keep the turbo'd engine's CR lower than we might on an NA version, by maybe a whole ratio point, because it's not just the temperature rise that can lead to detonation. There's a lot of blah blah involved in that, and it is EXCRUCIATINGLY well documented in millions of words on the subject already, so I'm not even going to try. But what is important is that your simple arithmetic leading you to this psi value or that psi value is not the correct way to approach it.
  4. 1 point
    Imitate? seems like an odd choice, but there are certainly worse choices out there... its got some sweet upgrades. Larger alternator and bespoke wiring loom! wow.
  5. 1 point
    Additional restriction is a thing when the oil pump has been upgraded. Not just a "because" thing.
  6. 1 point
    Still wrong. For every extra bit of compression working against the piston on the compression stroke, you have more power than that working against another piston on the power stroke.
  7. 1 point
    No. No it won't. That is, a 10.5:1 NA will not beat a 9.5:1 turbo running 1 bar of boost. Reason? The turbo is stuffing TWICE as much mixture into the cylinder, then compressing it and burning it. It will make nearly double the power just because of that. Think about that for a bit before delving into unnecessary arithmetic that is based on a wrong premise.
  8. 1 point
    Well the common consensus is that of run as high of a compression ratio as possible, it is limited by the fuel essentially. It even says that in the link you posted. Higher comp will always drive nicer overall. The bit you may be missing is the dynamic compression the engine sees, Wether it is is made from low comp and more boost or higher comp and less boost the "piston speed" won't be impacted, as it's the same pressure on it in both situations. It's certainly not somehow way worse with higher comp.
  9. 1 point
    Seriously dude you should stop giving advice
  10. 0 points
    Yep, except an s15 can make 200rwkw tuned and around 220rwkw on e85.
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