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  1. fireslave

    Radiators? 1 core 2 core, cross flow, etc...

    thanks for all the helpful posts. i ordered a dual core aluminum radiator from griffin radiator. next project is to build a custom aluminum fan shroud... plan is to re-use the 350z fans. I was thinking of adding a vented hood to get rid of some of the excess heat... something like this...
  2. fireslave

    Compressor to 2 stroke eng.

    you could alyways increase the backpressure in the exhaust system to enable the boost to be retained in the cylinder. perhaps a turbo would work well for this, as it increases the backpressure as well as generates boost... although ot might not work at all since the backprssure increase could...
  3. fireslave

    Radiators? 1 core 2 core, cross flow, etc...

    Hey guys, im looking to get a new radiator for my project car, a vq35HR (350z engine) powered 240sx. the 350z radiator wont fit, and even if it would, i might need some additional cooling later on if i decide to turbo it. I want to buy a custom radiator, but i have no idea what to get. 1 core...
  4. fireslave

    Question about reed valves

    are any such valves durable in the long term? i was under the impression that carbon fiber was only good to about 500-600F, and i figured metal valves would fatigue easily... i actually way over stated the speed... i originally meant 5000 times per minute but i wrote second... I actually...
  5. fireslave

    Question about reed valves

    I am wondering what the maximum limitations are on reed vaves... is there a reed valve design that can open and close 5000x per second, or is that absurdly beyone what is possible? could such a valve withstand heat variations in the 500F to 1200F range? it wouldnt need to prevent 100% of...
  6. fireslave

    Help with calculating air mass through throttle body/orifice

    what i mean is when you compress a cubic foot of air, but only .99 cubic feet of that is actually air, the reduction of volume would be closer to what you would expect from .99 cubic feet of air, not 1 cubic foot of air. that .01 percent which is water will only compress slightly, where the air...
  7. fireslave

    air pressure in an exhaust manifold behind a turbocharger.

    yes, that is exactly what I am talking about. i had heard before that some turbochargers can operate with lower pressure in the exhaust manifold than in the intake, but that it would only be in a certain band of engine performance where such optimal things happened. but lets say, for example...
  8. fireslave

    air pressure in an exhaust manifold behind a turbocharger.

    i need a rough idea of what the air pressure would be behind a turbo making about 7psi of boost. turbo would be t25-ish in size and would be serving about 1.7 liters of engine i only need a very rough idea... if you say, for example, its 10-15psi above atmospheric than that's close enough for...
  9. fireslave

    Help with calculating air mass through throttle body/orifice

    found a website that has a few web-applications that are useful for calculating air density input is pressure in mb (1000mb = sea level... i didnt even relize b was metric... makes sense though) temperature in C and dewpoint, as moist air is somewhat less compressable...
  10. fireslave

    tie rod repositioning

    the plan is street/auto-x/open track days actually, maybe just street/open track. i dont think it will be too competetive in auto-x because the engine swap and steering system mods will probably bump it into an overly competetive class (suspension mounting points cannot be changed in most of...
  11. fireslave

    tie rod repositioning

    ah yes, the camber change (especially on the inside wheel) is also responsible for the amplification of the akermann effect. never even thought of that until i tried it in 3d. my example pic is prob. way more than 2 inches though... (i don't have exact dimensions to build a good model with...
  12. fireslave

    tie rod repositioning

    heres another pic. I am glad you don't think it will be a big problem though, thanks kinda what I thought and hoped. heres another pic... bumpsteer is fine, but it does add a little akermann. this is why i didnt want to try and do it in 2d. I am thinking the thing to do might be to make...
  13. fireslave

    tie rod repositioning

    i didnt realize this until i modeled it in 3d, but because of the arc the knuckle swings, it effectively changes the length of the steering arm as it swings. in my attached pic, you can see that the tie rod is at a larger angle than it would be if it were stock (stock is represented by the red...
  14. fireslave

    tie rod repositioning

    To clarify, I will be lowering the outer tie rod pick-up points, otherwise bump steer will be horrible. I am also considering moving the pick-up points outward as well, to reduce akermann back to a normal level. excessive akermann shouldn't hurt handling a lot, but it causes the inside front...
  15. fireslave

    Help with calculating air mass through throttle body/orifice

    I dont know how you would get a precise answer, but you could get an approximation if you had a decent idea what the volumetric efficiency of the engine was. Most cars are somewhere around 80-90% efficient, which means that if a cylinder displaces 100cc, for example, there will be 80-90cc of...
  16. fireslave

    tie rod repositioning

    I have a 240sx project car that I am swapping a v6 into, and i was forced to relocate the steering rack because of clearance issues. I had to lower it 2 inches because the pinion housing was in the way of the starter motor. Anyways, I figured that I could just add a 2 inch drop to the outside...
  17. fireslave

    relative HP vs DA for forced induction engine

    Ah, and a note on point 2 for the non-positive displacement scenario. If you have a centrifugal supercharger, there is obviously no wastepaper, and no change in backpressue. the same absolute pressure would require spinning the compressor slightly faster to generate the same absolute pressure...
  18. fireslave

    relative HP vs DA for forced induction engine

    If you have a turbocharger, or a centrifugal supercharger, you should be able to set it up so there is almost no loss in power. ie, at 1 bar (sea level) you have 3 bar of boost, which means that the total pressure is at 4 times atmospheric. if you are at a high elevation and the atmospheric...
  19. fireslave

    Low press. air(high flow) powered air compressor (for higher press.)

    Basically, im am wondering if there is a lightweight air type pump that is suitable for this application. I have an air source at like 300cfm at like 7-10 psi above atmospheric, and i want to be able to generate up to about 100cfm of air at somewhere around 20 psi above atmospheric. It would...
  20. fireslave

    Anti Lag Systems - possible to reduce turbo damage?

    so does anyone know how the air gets into the exhaust mainfold? is the intake manifold pressure just always higher? (i doubt it) or is there some sort of open-close effect after the pressure from each explosion disperses?

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