zboi

I was doing some thinking and think that I have discovered an excellent trick to get some higher compression and better piston rod characteristics from a stock dish piston setup. I don't have the parts in my hands to take exact measurements, but it seems like you can take an L28 with dish pistons, swap in 240z rods (2.65mm longer) and then remove about 2.15mm from the dish piston tops. This should get them to be basically a flat top, with depending on head gasket and block deck height, a nice tight clearance. You get the performance benefits of better rod ratio, smaller trapped area between top ring and piston top, and higher compression for minimal costs. Anybody do something like this before?

I saw them selling for $6200 in Europe. They are CNC heads already so I wouldn't expect a whole lot more cost for the DOHC variant. Derek what you've done is cool and all, but my gripe is that you stopped making the head a long time ago. Why not share the files with someone like Edelbrock so they can make a head for the masses. We're at the point where L series are becoming scarce and manufacturers don't even have incentive to make parts for them anymore.

Don't worry PAMS is already testing a real DOHC head on cars and you will actually be able to buy it. I expect prices to be better and unlike this head it will install without a headache and an engineering team.

These are not just bare heads, but unmachined heads. And it's just one not a pair. Yes inflation has been ticking up substantially, but not long ago you could get a pair of assembled ls3 heads for $800. Derek came in here to try and stroke himself for a ten year celebration, but let's all be real this cylinder head was made for himself. Dude wants to keep it for himself too.

Don't fool yourself man, nobody has this head, it's just a talking point.

You ever think about liscensing or giving the design out to a real head manufacturer? Its been so many years thay we have gotten to the point that L series engines are disappearing and becoming less and less popular, and you have only sold 22. You haven't actually done anything tangible for the community. Now if a real company made some heads like this for about the $1000 they should cost, then the world would change.

Ooof 40 and 80 are really bad. Bad results wet would point to broken/pinched ring, but if your really lucky a sooted up ring. I used something called b12 chemtool in my cylinders when I got the motor. It had been sitting outside at the previous owner's place and got some water in the intake. To my surprise it cleaned up perfectly and had 135-140 compression on all cylinders. Valve sticking would be very obvious to spot with the valve cover off, you would see a valve noticeably lower than the rest, unlikely to be the issue though.

Most likely thing to be leaking is the wastegate if it is a cheapo one. Next thing would be to check the blow off valve, normally they are springed at 6psi by default. Depending on what kind of muffling your doing, you should be able to hear the turbo spooling up and screaming.

I'll repeat myself one last time, the issue is with power to the unit. Look at the symptoms, all the outputs from megasquirt are cutting off at the same time. Check your powers, check your grounds, check your relay, use your brain.

You need to be pulling a power wire straight off the battery to the ECM, and then another power wire from switched 12v.

Ok, so heard a clicking sound which was at the same time your tach signal cut too (RPM needle dropping instantly). Is the clicking the fuel pump relay or something else? The tach signal is coming from the megasquirt ECM right? If yes then this is the power to the whole unit cutting on and off. Either from bad power/ground or faulty ECM.

Chinese .63 A/R t04E with the billet compressor wheel. https://www.ebay.com/itm/174278894818

Got everything tuned up a few months back, the car runs great, the power feels like its strongly in the 300s, but I can see that the cylinder head is holding the motor back. Quite sure there is detonation, as my computer keeps thinking there is, and the power is not really increasing at all above about 14psi. I think I will add a flex fuel sensor and try adding some e30 or something. I don't have enough injector to go very high on the ethanol content. Then again, it is quick enough as is. All in all I'm pretty impressed in how much this motor woke up with this setup, the turbo spools so quick that even off idle it feels like a much bigger motor.

Those AFRs are both way off. Most of what your saying makes no sense, and if you don't see that yet you really need to read more of the docs of tuning and megasquirt. I'm pretty sure your just way off with your megasquirt tables.

You sure that is controlling the fuel pump? I would expect it to control the injector instead. Typically the ECU will just command the pump on and off. I've only seen pump duty cycle controlled on really advanced setups. Do you have a fuel pressure sensor somewhere to monitor? Also DFCO shouldn't be used at all with a manual transmission, unless again you have a sophisticated system that can tell what gear the transmission is in.