Noz

14-15:1 AFR whilst cruising is what it should be doing. If your O2 sensors are operational, then close to 14.7:1 stoich. Where are the wideband sensor(s) located? If it's a sniffer pipe, then a reported leaner idle condition is typical. The Z32 uses a MAF, which measures the mass of the airflow, which is dependent on the density of the air, which is what will change from the warmer to colder months. MAF-based systems don't require any IAT correction. If it is indeed losing such a large proportion of power, it can only really be due to a reduction in boost level and/or timing. It could be that heat soak is causing knock, but need to know more info.

Last time I looked, Power Enterprise weren't interested in rebuilding them, and everything is custom so they're a no-go, really. Did the turbo company shed any light as to why exactly the bearings failed? Too much oil pressure, not enough oil pressure, contaminants etc?

You need to now determine why it is in safety mode. If it is constantly in safety boost, it will likely be the loom for the knock sensor. You should have DTC code 34. Fix 1: 1MΩ resistor to bypass the knock sensor. ONLY do this if you are 110% that the engine isn't knocking and the mapping is suitable & safe. Fix 2: Remove the engine and fit a new knock sensor. Never use regular unleaded, Tesco Momentum or Shell V Power Nitro.

That's something we can definitely take a look at.

Off-topic: Been a while since I mapped that car, how's it treating you?

Hello & welcome. Lots of different ways to accomplish your goal of big power from cheap beginnings :)

It is imperative that the fuel pump is fitted securely with the pick-up at exactly the same height as the OEM item. A few months ago I was working with a car that had a very strange issue. After a session on the dyno, the car began to run lean on boost. On the second session, after an entire day on the dyno with at least 40 runs under its belt, it began to run lean again, and got worse and worse with time accompanied by a measured loss of fuel pressure. A large number of things were swapped over and investigated and the car then had to be taken away. One thing that was swapped was the entire fuel pump assembly & cradle, which I tested in my own car without issue with minimal fuel. Their pump & cradle OK in my Zed. The other Zed went away with an identical pump & cradle setup I had been running in my own Zed. No further issues. My pump & cradle OK in their Zed. They keep my pump & cradle. Job done. I fit an even higher flowing pump and leave theirs bagged up for testing purposes as a spare. Fast forward to today and the other fuel pump & cradle assembly are going into a Zed for testing purposes. I get a call asking if the pump & cradle assembly had ever been fitted and whether or not the car ran OK. Apparently, the pump had been fitted about 10mm lower down the cradle and was resting against the bottom of the tank! The car wouldn't even start unless the cradle wasn't bolted down in place! What could have been happening in the original Zed was when the fuel had dropped below halfway, it naturally created a vacuum in the tank, the magnitude of which varies depending on the specific car's fuel tank breather. As the fuel had dropped, I'm assuming that either the bottom of the tank sucked up enough to hinder the fuel flow, or the lower fuel level meant slightly less buoyancy on the fuel pump, which then proceded to sit on the bottom of the tank. The leaning of the AFR wasn't particularly consistent, so it was a real oddity. Obviously running without the fuel cap had been investigated along with FPRs, fuel lines, breathers, etc. Perhaps it was a combination... So. Months later the issue is finally resolved. I didn't fit the fuel pump by the way, only the one in mine which ended up in the first car without issue to this day. I keep away from spannering as much as possible :wack: As Stephen has said, and also without meaning to sound rude, parts need to be fitted correctly with the proper tools and work methodology. A "couple of flames" means nothing really, proper diagnosis involves monitoring sensor readings, voltages, fuel pressure, AFR, etc. Actual data with the knowledge to interpret the results correctly. Hopefully there wasn't any further damage caused by the fuel pump installation, it may have been running with reduced fuel pressure and leaner AFRs as the pipe worked its way loose. Jubilee clips would have prevented that from happening even without securing the pump to the cradle, which you need to do on ANY car. It's very important. As is always the way, do a compression check. Not because something has gone massively awry, but because the plugs are out and you may as well, it's for your own knowledge. If you want a cursory idea of the condition of a paint job, you look with your eyes. If you want a cursory idea of the condition of an engine, you do a compression check. A bit more involved, but just as basic a task. HTH :)

All the best mate :pint:

I don't know what could be disconnected all of a sudden, it's difficult over the internet. The fuel hose has already come off once due to the pump not being secured, so things may still need checking over.

Unburnt fuel? The first set of plugs are completely ruined from fuel, but given that the outlet hose from the pump had come loose, it's difficult to see how that has happened. Is there anyone nearby that can check it over to ensure everything is fitted & connected properly?

What is the spec of your Zed? Boost controller fitted? What boost does the car produce? Did the lack of performance come at exactly the same time as fitting decats? If you're only seeing 7psi and it's in safety mode, that would explain the poor performance. It could be a coincidental issue, such as faulty knock sensor loom causing code 34 for example.

Which Zed was it? Best case scenario it's a loose coil pack connector. Then you have coincidental failures such as a faulty injector, loom issue etc. Next up, you've got fuelling/timing related symptoms such as a melted plug with no damage to piston or cylinder. Worst case scenario you've killed either #5 or #6 piston. Not enough fuel, too much timing, failing fuel pump. I've not yet come across a fried coil pack as per the S13 or S14 which can suffer from failure at higher power levels, they are incredibly good on the VG with no issues at 700bhp+ Assuming it's not a loose connection and something has physically failed: Find the cylinder that is down by removing each coil pack connector one at a time until there is no change in engine note/rpm. Then you need to determine if it's a lack of fuel or spark. Use a long screwdriver with the blade end on the injector and the handle pressed fimly against your ear. The ticking is loud enough to determine if the injector isn't firing. Try it on a known working injector first to get an idea of the sound. If the above doesn't uncover a faulty injector, pull the plug. Hopefully it won't be covered in oil. Place the plug back in the coil pack and carefully rest the side electrode against the plenum and start the car to determine if the plug is firing. If it isn't, swap a known working coil pack and see if the issue moves to another cylinder. Perform a full compression test as a matter of course to determine the health of the engine. Give me a shout if you need any assistance. Hopefully it's just a connector, but the above should cover most of what you may need to do :)

Happy belated birthday!

On a few Zeds, it is not possible to connect to the Consult port until the engine is actually running. I was working with a K reg the other day with an alarm system (TOAD IIRC) and once the engine was switched off and the key returned to IGN on, Nistune would remain connected for approximately 15 seconds before automatically disconnecting. I have only come across 3 Zeds in total like this. With a different, older ECU (still 8 bit of course), it was subsequently possible to connect to Consult on IGN without the engine running. I've not really looked into it further.

I was happy with how it ran once the MAP sensor was plugged in and the fuel lines renewed. Won't be long until it's done I reckon :D

Flyers - Class B (RWD) No Speed Name Car B23 190.08 Stevie Ross Ford Granada 6.3 Ltr B16 167.754 Paul Norris Talbot Sunbeam Cos 2 Ltr B15 157.1 John Morgan Porsche 996 Turbo 3.6 Ltr B24 153.727 Simon Paul Toyota Supra Turbo 3 Ltr B39 151.397 Mike Solan Porsche 991 GT3 3.8 Ltr B38 146.481 Jason Bird BMW M5 5 Ltr B18 140.371 Neil Weyman Nissan 300zx 3 Ltr B31 135.786 Ian Greenfield Nissan 300zx B26 121.045 Steven Bayliss MEV/RTR Rocket 2.1 Ltr B35 116.782 Peter Macdonald Nissan 300zx Data last updated 26/07/2015 13:20:46

Circuit - Class B (RWD) No Time Name Car B21 33.44 Duncan Cowper Dax Rush MC B28 36.32 Robert Dixon Nissan 300zx 3.1 Ltr B39 36.95 Mike Solan Porsche 991 GT3 3.8 Ltr B33 37.25 Tim Bedford Formula 27 Kit Kar 1.3 Lt B16 37.30 Paul Norris Talbot Sunbeam Cos 2 Ltr B37 39.16 George Beavers BMW 328 2.8 Ltr B14 40.11 Sam Dawes Nissan Skyline 2.5 Ltr B38 40.4 Jason Bird BMW M5 5 Ltr B23 41.83 Stevie Ross Ford Granada 6.3 Ltr B36 42.85 Emma Oldfield Toyota MR2 1.8 Ltr Data last updated 26/07/2015 13:20:01 Get in there Bob!

Well, that's the first time in 4yrs I'm not competing! Live results: Drag Strip - Class B (RWD) No Time Name Car B23 10.88 Stevie Ross Ford Granada 6.3 Ltr B21 10.91 Duncan Cowper Dax Rush MC B32 10.98 George Lawton Toyota MR2 Turbo 2 Ltr B16 11.36 Paul Norris Talbot Sunbeam Cos 2 Ltr B28 11.39 Robert Dixon Nissan 300zx 3.1 Ltr B39 11.68 Mike Solan Porsche 991 GT3 3.8 Ltr B15 11.77 John Morgan Porsche 996 Turbo 3.6 Ltr B24 12.04 Simon Paul Toyota Supra Turbo 3 Ltr B33 12.88 Tim Bedford Formula 27 Kit Kar 1.3 Lt B20 12.9 Simon Durrans Nissan skyline R33 2.5 Lt B38 12.97 Jason Bird BMW M5 5 Ltr B18 12.98 Neil Weyman Nissan 300zx 3 Ltr B26 13.95 Steven Bayliss MEV/RTR Rocket 2.1 Ltr B31 13.97 Ian Greenfield Nissan 300zx B14 14.32 Sam Dawes Nissan Skyline 2.5 Ltr B35 14.54 Peter Macdonald Nissan 300zx Data last updated 26/07/2015 13:16:52

Daily driver for me. A real shame I won't be able to showcase the new manifolds, a work of art :drool:

3" all the way from turbo back if you can. You require the minimum amount of back pressure achievable post turbine housing. On stock turbos, I ran a peak boost pressure of 1.7 bar with standard manifolds and elbows, achieving 482lb·ft at 3900rpm. The way to do it is to concentrate on allowing the VG to breathe. Once that is accomplished, it is about consideration for the rear 2 cylinders. The stock manifolds became a severe restriction when I went to GT2870 turbos, 1.8 bar and 570 bhp.

3" all the way from turbo back if you can. You require the minimum amount of back pressure achievable post turbine housing. On stock turbos, I ran a peak boost pressure of 1.7 bar with standard manifolds and elbows, achieving 482lb·ft at 3900rpm. The way to do it is to concentrate on allowing the VG to breathe. Once that is accomplished, it is about consideration for the rear 2 cylinders. The stock manifolds became a severe restriction when I went to GT2870 turbos, 1.8 bar and 570 bhp.

It's definitely getting there. Plenty more to add though, including the new FMIC & 2.5" pipework kit, single intake manifold, top feed injector kit etc. Then there's methanol injection, nitrous and a bottom end with forged pistons of course. Never-ending. I have never been to Ireland at all, I'm afraid to say. I did recently speak with a dyno operator in Belfast however, so it shouldn't be an issue organising something :)

It's definitely getting there. Plenty more to add though, including the new FMIC & 2.5" pipework kit, single intake manifold, top feed injector kit etc. Then there's methanol injection, nitrous and a bottom end with forged pistons of course. Never-ending. I have never been to Ireland at all, I'm afraid to say. I did recently speak with a dyno operator in Belfast however, so it shouldn't be an issue organising something :)

As is the way with these things, it will be ready when it's ready. Lots of things need to come together and some good people have put in a lot of hours. The manifolds are prototypes, so the main thing is getting those tested in order to supply similar items in the future :) If it doesn't make TOTB, then it will be the first time I haven't competed there in 4 years. Exciting stuff :laugh:

As is the way with these things, it will be ready when it's ready. Lots of things need to come together and some good people have put in a lot of hours. The manifolds are prototypes, so the main thing is getting those tested in order to supply similar items in the future :) If it doesn't make TOTB, then it will be the first time I haven't competed there in 4 years. Exciting stuff :laugh: