Tricky-Ricky

Did you not post another question on the same subject yesterday?

Whats so odd about a pair of hybrid turbos being capable flowing enough air to make 450 +BHP, add the 264 cams, which will also allow more airflow. A decent BPU setup with std turbos can make 400BHP. Mine was making over 480BHP not even fully mapped when I was offered a single turbo setup at a price I couldn't refuse.

Errr that's what I have been telling you for the last two pages ....LOL!

The N/A is not built for cooling a turbo, so I would say an oil cooler is a must, although a good fully synth should cope, that sort of temp on a regular basis is going to call for very regular changes, so save yourself some cash and fit a decent oil cooler.

Yes there is a dip in both fuelling and timing, but that only if in TTC mode, the OP is still in sequential, however my fuelling running lean was as I stated at peak load areas, the std ECU could not supply any more fuel, even though I had an EMU tweaked for TTC, its still cant add any more fuel than the injectors allow, like I said once the ECU sees airflow of 4 to 4.2/4.3V (clamped at 4.35v) it will run the injectors at 100%DC so there is nothing to be done bar adding larger injectors and a way of controlling them.

Well just for comparison I ran a pair of hybrid turbos in TTC mode (not that that will change peak RPM/load fuelling requirements) and had to go to 560cc injectors as before with 440cc it was leaning out past 12AFR at just 1bar at peak load areas, and so it was quite obvious that airflow greatly exceeded normal BPU fuelling requirement's, which could go as rich as the high 9AFRs with the std ECU running injectors at 100% DC.

This is the reason why its running lean, its not just basic BPU. My current engine setup is as follows: 93 Supra Twin turbo with hyrbid twins from whifbitz. 264 cams. Aftermarket induction kit. FCD. Standard ECU. 440cc injectors. Walbro fuel pump. (I was advised by previous owner that this had been fitted) Full decat echaust system. HKS silent hi power. New Greddy Profec Boost Controller. Set to 1.0bar low boost and 1.2bar high boost. But agreed more info is needed hence my asking for all the specs from the dyno run including just where the AFR probe was positioned, if not pushed far enough up the tail pipe it can read lean from atmospheric air, but it was stated that the run was aborted due to not only AFR but knock detected.

I think that maybe your confusing boost pressure with air flow, because the hybrids your running will likely have larger and more efficient inducer and compressor turbines, They can be pushing considerably more air into the engine at any given boost pressure, add the cams which accomplish the same scenario, and you will have your reason for the lean running IE the ECU map and injector combination running out of resolution. It wont hurt to check the fuel filter, which could cause a restriction, however I would lay money that increased airflow is your problem, people who say piggybacks are not any good either have no real experience of them, or are quoting hearsay, there is nothing wrong with a decent piggyback set up correctly on the right application, I ran an Greddy Emanage Ultimate on my single turbo Supra making 550BHP with no problems.

You can run whatever power you like by controlling airflow/boost, so its not an issue, I would check with the RR guy to find out at what boost and power the lean AFRs and knock took place,(presuming you where not using low octane fuel?) then let us know and we can better advise you.

IF..its running lean at 1.2bar and the injectors are maxed out, adding a different ECU wont help, you will need larger injectors, As I said probably due to the hybrid turbos and the cam enabling the engine to shift more air flow than the injectors can compensate for. Also I would avoid going the SAFC route as alibabba suggested as there is not provision to adjust ignition timing, which is a must, at a minimum I would go Emanage Ultimate.

It will probably be down to the hybrid turbos and cams allowing for more airflow than the ECU can cope with, even though the std ECU will run the injectors at 100% DC when it sees over 4 to 4.2v, so your going to need a piggyback or stand alone ECU and some bigger injectors, Syvecs would be over kill if your not intending to take things any further, but its a good ECU to have if you are intending to tune more. Out of interest how lean was it running? and was the AFR probe far enough up the exhaust? as this will influence the figures.

You can achieve the same results with some G3 and an electric polisher, much less effort.

They all run slightly different, but its pretty normal to see 10AFR on full boost, the AFRs go very lean on closed throttle because the injectors are shut off.

The std ECU will run the injectors at 100% DC when it sees over 4.2v air flow signal for safety, at 1.2 bar as long as you don't see any leaner than 11.8 you should be fine.

Perfectly normal for the std ECU.

The old adage pot kettle comes to mind after reading through the latter part of this thread, not an entertaining read either, surprised its not been locked for the very reasons given by the OP.

http://cdn.corlate.xyz/2015/08/03/disneycarslightningmcqueenmovie-l-65e1ba417124775d.jpg

Looks normal to me.

Its obviously down to the emanage, but I would suspect something is not set up or connected right with that AFR reading, if it was purely the emanage map the std ECU would be fighting it a bit more than that, as the emanage is not able to keep closed loop AFRs that low, check the MAF and MAP connection's.

My god its taken three pages to discuss if a UK or J spec car is still that car after modifying.....and I guess the answer is that only a real purist would actually care.

That's a very pretty engine bay...if a bit purple...and I like purple:)

I used to get between 25 and 30MPG from my old Supra both BPU and single turbo...better than the Skyline 350GT I replaced it with. There are two things that effect economy other than whats already been mentioned and they are lambda sensors and ECU coolant temp sensor, both will cause a default rich mixture and mess with fuel economy.

IF the OP made anything clear...except for his attitude and insults, we wouldn't have any problems I think.

We all have to get our entertainment where we can.

Not quite sure if your referring to the spelling faux pas, or the annoying little twerp? if the latter I was merely giving advice. although I could have given more;)