thehelix112 Posted May 3, 2012 Share Posted May 3, 2012 Didier, You're much better with English than I am with French, so merci beaucoup! The flanges look like they were each machined from billet? That is, one piece of solid aluminium? Rather than having a flange cut then welding on pipe, which is what I was considering with my VK56 ITBs. Still deciding. It looks like you left the factory linkages between each group of 3 ITBs, then fabricated a custom connector to link the two sets of 3? And that this custom connector is actuated by a custom control point which appears to be mounted to something that's welded to the top of cylinder 3 & 4 exhaust headers? Thanks, Dave Quote Link to comment Share on other sites More sharing options...
didier Posted May 3, 2012 Share Posted May 3, 2012 Yes, you are absolutely right with this description !thank you for the help ! the big steel hose you see above the bodies will flow fresh cooling liquid above each exhaust port. Cooling issues on these datsun heads are a major problem, I 'm making a "reverse flow" system with a Davies Craig Electric water pump .Two little hoses in the upper pockets of the head will evacuate the bolling gases returning to the expansion tank . right? best regards . Didier 260 Z 2+2 Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted May 3, 2012 Share Posted May 3, 2012 Sounds good. Be interesting to point a laser temperature gun at the connections between the head and the big cooling line, and see how the temperatures change. There are a few good threads on here about cooling issues on the L6, http://forums.hybridz.org/index.php/topic/59029-head-cooling-on-cylinder-5-solutions/page__view__findpost__p__539888__hl__ is a good one started by TimZ with a high HP turbo L28. Would love to hear how you're measuring and validating your results, and how it all goes. Dave Quote Link to comment Share on other sites More sharing options...
didier Posted May 3, 2012 Share Posted May 3, 2012 Yes i know this thread, it was a good knowledge for me, but i think the peter Mac donnel's process on auszcar (pmc26) forum is best : he is drilling vertical holes between intake and exhaust ports to by pass the casting webs inside the head.Cooling flow is improved.Did you see that ? As for me, i stay with my system, flowing fresh water to each cylinder . wait and see. i'll try the laser temperature gun if i get one Quote Link to comment Share on other sites More sharing options...
didier Posted May 27, 2012 Share Posted May 27, 2012 (edited) Another photo showing the throttle command system Edited: I re sized your photo instead of just deleting it. Please re size to avoid them getting deleted. Edited May 29, 2012 by RB26powered74zcar Please Resize Images to: 1024 x 768 pixels or close, before placing on HZ. Quote Link to comment Share on other sites More sharing options...
duragg Posted May 27, 2012 Share Posted May 27, 2012 Megasquirt? Will you have an O2 sensor? Tj Quote Link to comment Share on other sites More sharing options...
didier Posted May 29, 2012 Share Posted May 29, 2012 (edited) Megasquirt? Will you have an O2 sensor? Tj Yes i've built an MS2/V3 and i get a wide band from Alan TO , but my car is still on restauration, i finished the body welding, and i work now on glass/polyester moulds . Sorry for the wrong size of my photos, i'll correct that . thanks Edited May 29, 2012 by didier Images way to large. Please resize before posting. Quote Link to comment Share on other sites More sharing options...
didier Posted May 29, 2012 Share Posted May 29, 2012 Here is my working process Quote Link to comment Share on other sites More sharing options...
duragg Posted June 10, 2012 Share Posted June 10, 2012 Presently I have one electric fuel pump feeding the Triples. With EFI I will need a high pressure pump, filter, regulator and a return line? Not sure if my 1973 had a return setup, there are some plugged lines I have never messed with. Quote Link to comment Share on other sites More sharing options...
didier Posted June 19, 2012 Share Posted June 19, 2012 Presently I have one electric fuel pump feeding the Triples. With EFI I will need a high pressure pump, filter, regulator and a return line? Not sure if my 1973 had a return setup, there are some plugged lines I have never messed with. Yes, with EFI, you need a high pressure pump, a damper, a regulator with vaccum hose, AND a return line. I think every Z gets a return line with SU's originals mounts. Quote Link to comment Share on other sites More sharing options...
duragg Posted June 19, 2012 Share Posted June 19, 2012 Collecting throttle bodies now and studying Megasquirt. Quote Link to comment Share on other sites More sharing options...
didier Posted June 19, 2012 Share Posted June 19, 2012 Collecting throttle bodies now and studying Megasquirt. Good choice,and good study ! Quote Link to comment Share on other sites More sharing options...
ArchetypeDatsun Posted June 20, 2012 Share Posted June 20, 2012 (edited) I saw this set up on a 280zx at a local Z car show on Saturday they look awesome. Edited June 20, 2012 by 280zx@541 Quote Link to comment Share on other sites More sharing options...
didier Posted June 20, 2012 Share Posted June 20, 2012 I saw this set up on a 280zx at a local Z car show on Saturday they look awesome. Look fine, but the trumpets are too short for a good harmonic tune , unless + 10000 revs/mn Quote Link to comment Share on other sites More sharing options...
Tony D Posted June 20, 2012 Share Posted June 20, 2012 Well, those trumpets work on my application... It does generally conform to the stated range of rpm application... Quote Link to comment Share on other sites More sharing options...
PMC raceengines Posted June 20, 2012 Share Posted June 20, 2012 (edited) The L motor really needs around 13in of inlet runner to give good torque , from the tip of the trumpet to the port face , and for a road car i try and make them as long as i can, trumpets 120mm long. Close to 15in long runner on a L28 29 . If the runner is to short it will reject a lot of fuel at 4000+ . Edited June 20, 2012 by PMC raceengines Quote Link to comment Share on other sites More sharing options...
didier Posted June 20, 2012 Share Posted June 20, 2012 The L motor really needs around 13in of inlet runner to give good torque , from the tip of the trumpet to the port face , and for a road car i try and make them as long as i can, trumpets 120mm long. Close to 15in long runner on a L28 29 . If the runner is to short it will reject a lot of fuel at 4000+ . Do you mean " port face " is the head flange ? the length to valve seat is about 110mm, so 13 in (330 mm)+110= 440 mm, you are right for an harmonic tune not so high in rpm But 15in ( 380mm) + 110= 490mm is very long,not very good for +6000 T/mn I make my calculations with a french firmware, and i will make differents lengths of silicone hoses and fiber trumpets , and i 'll test in real world next time. excuse my english ! Quote Link to comment Share on other sites More sharing options...
duragg Posted June 20, 2012 Share Posted June 20, 2012 A few questions while we are kicking around ITB. 1) IN general then am I hearing that a little longer is better than a little shorter? 15" from trumpet tip to mounting flange at head face? or into the valve? 2) Having some trouble locating the code: 35f0 GSXR throttle bodies. I have read that is the code for US spec 2001+ EFI ITB Gixxer. I want to matched sets to make one. 3) A little research shows that Ms1v3 or mS2V3 will do just fine condisering I want spark control also. I don't have the rest of my life to figure out Megasquirt so I am looking for an easy kill on which SW. 4) Is there a fuel pump that people generally accept as acceptable for an EFI installation? Quote Link to comment Share on other sites More sharing options...
PMC raceengines Posted June 20, 2012 Share Posted June 20, 2012 The 13in one makes power at 4500 to 7500 with a cam with 260@50 310d 550lift and is very strong at 6000rpm max hp at 6500 and will hold to 7500 in a L28 29 with 10.5 comp + The long runer makes max power at 5800 and will fall over after so its good for the road cars, very good torque at 3500 with a mild cam There are many things that can change the rpm that the intake works , but these are what i end up with on the dyno most times Quote Link to comment Share on other sites More sharing options...
didier Posted June 20, 2012 Share Posted June 20, 2012 The 13in one makes power at 4500 to 7500 with a cam with 260@50 310d 550lift and is very strong at 6000rpm max hp at 6500 and will hold to 7500 in a L28 29 with 10.5 comp + The long runer makes max power at 5800 and will fall over after so its good for the road cars, very good torque at 3500 with a mild cam There are many things that can change the rpm that the intake works , but these are what i end up with on the dyno most times I agree to that totally ! I'm still waiting for your DOHC RB build results ! amazing ! Quote Link to comment Share on other sites More sharing options...
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