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  1. timiacobucci

    What are the benefits to seam stitch welding for a tarmac rally car

    In case you actually want to do this I did some research a while back and unless you have access to that pyrolysis oven like the wrc guys this is likely the next best thing for mere humans. http://www.rallyanarchy.com/phorum/read.php?5,6465 It's used to fog liquid nitrogen, you freeze all...
  2. timiacobucci

    all wheel drive center differential two way sprag

    Don't worry, I heard what you meant not what you said. It'a a confusing concept really, from the drivetrains point of view the front is rotating 5% slower than it thinks it's driving it at, but from the wheels the gearing is trying to rotate them 5% faster than it can without any slip in the...
  3. timiacobucci

    all wheel drive center differential two way sprag

    I've been researching the details of this again and have come across some interesting information to add. Two other forum discussions in particular have caught my interest. The first is an FSAE forum discussion about the wiesmann locker...
  4. timiacobucci

    all wheel drive center differential two way sprag

    I understand the idea of welding hardened gears and differential cases is less than ideal but limitations impose working under less than ideal conditions sometimes. I have personally tig welded one of these differentials, both input and output spider gears to make a full center spool. It welded...
  5. timiacobucci

    all wheel drive center differential two way sprag

    This is the w4a33 automatic all wheel drive transmission found in 90's mitsubishi/chrysler cars. Mine is from a 91 eagle talon. Currently there is no aftermarket support for the center differential The small spider gears are a weak point on this and the manual version of this transmission...
  6. timiacobucci

    total induction volume with supercharger

    This is a subject and experiment I am doing on my own. I wouldn't mind running some simulations but I also don't have the software for that at my disposal. Do you and have you learned something relevant about this subject? Ultimately I think my time is better invested in just actually...
  7. timiacobucci

    total induction volume with supercharger

    Have you looked at the thread I linked to? There are actually many people already successfully doing this. These things are not really hypothetical at this point, it's been done as I described and it works very well. Most modern blowers use a bypass for efficiency reasons at idle and cruise...
  8. timiacobucci

    variable intake / independent throttle body idea

    Hemi, I realize it is not altering the actual phsyical port area or valve area, it is definitely accelerating the flow just prior to it though. For example the 4g63 engine I am planning this ITB setup for with a bike throttle like I have planned actually puts the throttle inches away from the...
  9. timiacobucci

    Help choosing piston configuration (making dream engine blueprint)

    Ohhh, I beg to differ, https://www.youtube.com/watch?v=z8InG6T9pxs I mean if a critical criteria is fun to draw how can you beat that? If not radial is a flat 12 not exotic enough? I think you've got the idea with a roots positive displacement for twin charging but a lysholm is more...
  10. timiacobucci

    total induction volume with supercharger

    I think you have the right idea and the principles at work figured out but you may be over complicating the control mechanism You are talking about regulating the upstream throttle based on the pressure differential of the 2nd throttle. A direct 1:1 mechanical linkage already does this. The...
  11. timiacobucci

    variable intake / independent throttle body idea

    I don't understand how it could be anything else. Even carb function is still essentially depending on velocity. I think we are really talking about 2 aspects of the same thing here. The last part of what you are describing, continuing to fill the cylinder as the piston returns back up after...
  12. timiacobucci

    variable intake / independent throttle body idea

    BrianGar, that is a very cool setup, I would like to see pics and hear the results of the finished product. I agree, this was a section of the formation of this idea that I had, that I concede is obviously not original, though I did not know for sure if it was in practice anywhere else though...
  13. timiacobucci

    variable intake / independent throttle body idea

    Not a huge gain but I imagine that pure torque #s are not the entire story. You can hear an engine gasp and play catch up with a large opening of a large throttle even with correct fueling and throttle enrichment, it's worse the heavier the load is and a sport bike is about the best power to...
  14. timiacobucci

    variable intake / independent throttle body idea

    gsxr
  15. timiacobucci

    variable intake / independent throttle body idea

    That is pretty crazy. It's not exactly what I was talking about but still very impressive. Have you got picture or details of your system anywhere online already? I take it RR is rolling road? You could still get very useful information from an acceleromter setup like a gtech, it sounds like the...
  16. timiacobucci

    variable intake / independent throttle body idea

    THIS ^, is exactly what I was looking for and suspected. Thank you. I was aware of sport bikes using dual throttles but did not understand if that was their function. I did try and research it but couldn't find a whole lot of technical information about it's function. Most people seem to just...
  17. timiacobucci

    variable intake / independent throttle body idea

    Well if your map sensor is pegged at atmospheric at 30% throttle at lower rpm there is no extra charge density to be gained from the other 70% throttle opening. There is a drastic reduction in velocity though for the same non - gain in density. Higher velocity of equal density equals better...
  18. timiacobucci

    variable intake / independent throttle body idea

    I recently had an idea for a modification of an independent throttle body system to mimic the function of a variable geometry intake system simply using throttle opening. Until recently I had not considered that part of the responsiveness of an itb system lies in the port velocity generated at...
  19. timiacobucci

    total induction volume with supercharger

    Sorry for the delay, I'm not sure if you are still considering this but it is something I have been researching recently myself. Basically my understanding is that your thinking is exactly correct on about every point. This is actually a modification that has been well covered in the miata...

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