TrumpetRhapsody Posted December 10, 2007 Share Posted December 10, 2007 it is possible to tune each cylinder w a very sophisticated FMS and individual EGT probes after EACH cylinder... much like high performance aircraft use. So I guess megasquirt wouldn't count as "very sophisticated" by that definition. That would be pretty crazy, since I guess along with EGT probes you would have to have fuel maps for each cylinder. Talk about some programming. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 10, 2007 Share Posted December 10, 2007 Im going to sidebar this conversation, we are cluttering up his thread. Ill start another post in this forum and we can discuss. BTW, I can tune like that with my power FC, there is a percentage value you can tweak for each cyl. Evan Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted December 10, 2007 Share Posted December 10, 2007 You run lean in #6 because its getting too much air, not too little. I think what happens is the air has inertia in flowing that makes it harder for it to make the right angle turn on the way down the plenum, but easier after its already stationary after hitting the end near 6. Also, as air increases in temperature, so too does the increase in particle excitation, and hence the speed at which pressure equalizes, as indicated by an increase in the speed of sound. This is likely to affect your ram-effect RPM range. Here is a potentially handy calculator: http://www.sengpielaudio.com/calculator-speedsound.htm Regards, Dave Quote Link to comment Share on other sites More sharing options...
olie05 Posted December 10, 2007 Share Posted December 10, 2007 Prox, dump the plenum... now's your chance to go N/A!!! Quote Link to comment Share on other sites More sharing options...
nismopu Posted December 10, 2007 Share Posted December 10, 2007 I tried reading everything but I wanna know where you got your airhorns from? Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 10, 2007 Share Posted December 10, 2007 You run lean in #6 because its getting too much air, not too little. I think what happens is the air has inertia in flowing that makes it harder for it to make the right angle turn on the way down the plenum, but easier after its already stationary after hitting the end near 6. Also, as air increases in temperature, so too does the increase in particle excitation, and hence the speed at which pressure equalizes, as indicated by an increase in the speed of sound. This is likely to affect your ram-effect RPM range. Here is a potentially handy calculator: http://www.sengpielaudio.com/calculator-speedsound.htm Regards, Dave Dave hit the nail on the head from what I have heard. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 10, 2007 Author Share Posted December 10, 2007 the velocity stacks came from Blue Grass Muffler Dave.. your 100% correct... My aircraft performance class intensely covered the speed of sound and change in the speed with altitude, density and temperature. =) Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted December 10, 2007 Share Posted December 10, 2007 Sweet, just checking. Did you account for increased SoS with pressurized air charge when calculating runner length/harmonic rebound/ram-effect rpm range? Probably not much that can be done about it now, will be interesting to see if there is any noticable power peaks at or above your predicted rpm range. Dave Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 10, 2007 Author Share Posted December 10, 2007 no the calculator I used was based on a standard temp... (59* F 29.92 in. hg) here are some more pics of the manifold! I found those hoses for a total of $70 for all 6 cylinders! MUCH cheaper then I had planned. Yes its ugly and definitely detracts from visual aesthetics =( kinda bummed about that.. but if I want it pretty I have to spend $210 on aluminum u-bends. Quote Link to comment Share on other sites More sharing options...
TrumpetRhapsody Posted December 10, 2007 Share Posted December 10, 2007 Hey, if it saved that much $, props to ya. I'd do the same. If you want it to look fancy try some sort of spray paint or something that won't flake. Maybe even chrome paint, i dunno. Quote Link to comment Share on other sites More sharing options...
Careless Posted December 11, 2007 Share Posted December 11, 2007 if it works as well or better than hoped for, then spend the money on it later... for now I think what u have will work fine to test it, so long as they don't blow off... which might be a bit of an issue. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 11, 2007 Share Posted December 11, 2007 Or blow apart! Should be fine if you keep a close eye on it though. Your welds look very good though! Quote Link to comment Share on other sites More sharing options...
trwebb26 Posted December 12, 2007 Share Posted December 12, 2007 I've been following this thread from the start with the idea of making an intake manifold with long curvy runners that go OVER the head and put the intake manifold on the right side of the car - allowing for more room for the turbo - cleaner intercooler routings - longer runners (smaller pulse number) - less manifold heatsink - and ???. Lord knows there is PLENTY of room on the right side of S30 engine bays! There would have to be room for the fuel rail to fit in there, hood clearance may be a problem, and I'd want to switch to COP ignition to get the spark plug wires out of the way. Does anybody have any opinions on this idea - or am I on crack? FYI - I started this whole idea by seeing what PROX has done... and I've started to concept up my steel weld el tubular equal length turbo exhaust manifold - not a lot of room under the current manifold to maneuver the tubes around for sure. Quote Link to comment Share on other sites More sharing options...
datsun40146 Posted December 12, 2007 Share Posted December 12, 2007 So its finished now right? So when are you going to bolt it on to see what kind of power it makes? I'd love to know what just an intake manifold change does to a L28. Of course your's isn't stock, but it should be a"similar" relationship. Quote Link to comment Share on other sites More sharing options...
Guest TeamNissan Posted December 12, 2007 Share Posted December 12, 2007 I'm curious, are you going to do a baseline to compare your mani vs stock? Also I asked what tbs you chose and never got a answer lol. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 12, 2007 Author Share Posted December 12, 2007 I would like to do a base dyno run.. then install the new manifold.. and do another run just for kicks. TeamNissan.. what do you mean by TBS? do you mean TPS (throttle position sensor)? If so I am using the 240sx tps, or using the stock TPS on the GSXR throttle bodies.. and I will match it up with megasquirt... hopefully Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 12, 2007 Author Share Posted December 12, 2007 Do you guys see any problems with using 180 degree Stainless or Aluminized steel for these bends?! It would be much cheaper then aluminum.. soooo much cheaper Quote Link to comment Share on other sites More sharing options...
Guest TeamNissan Posted December 12, 2007 Share Posted December 12, 2007 I would like to do a base dyno run.. then install the new manifold.. and do another run just for kicks. TeamNissan.. what do you mean by TBS? do you mean TPS (throttle position sensor)? If so I am using the 240sx tps, or using the stock TPS on the GSXR throttle bodies.. and I will match it up with megasquirt... hopefully By tbs I mean throttle bodies. They kind of look like those dcoe tb's they sell, so I wasn't sure. I can't wait to see how it compares to stock. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 12, 2007 Author Share Posted December 12, 2007 if you look back to the first post I made.. i wrote what i would be using =) Suzuki GSXR 600 throttle bodies Quote Link to comment Share on other sites More sharing options...
Guest TeamNissan Posted December 12, 2007 Share Posted December 12, 2007 Ya I knew I was going to take a hit for asking lol, I skimmed but didn't feel like reading every post . thnx though Quote Link to comment Share on other sites More sharing options...
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