lowrider

You would be correct, there was a recent thread that gave the dimensions of the ringland for the turbo and N/A flat-top pistons. The pistons are nearly identical for the exception of the pin height and the dish. Well thanks! This thing is definitely my labor of love. Ok, since I haven't updated in a while I'll get everyone up to speed. I installed a set of crx seats into the car. Fabricate a few brackets, use the datsun sliders, and we are good to go. I love these seats! The bolsters fit me so well and are so supportive! Pictures: Anyhow, this Sunday was quite interesting... I was running some errands in the car, just enjoying myself, when as a pull onto a side street I hear a "ting ting ting". I didn’t think much of it just sounded like a rock hitting my IC piping. I knew something was wrong when I no longer built boost... I pulled over immediately checked everything no blown joints everything is in its place. I limped the car home, when I get there I take the filter off of my turbo to find that my compressor wheel is not spinning. I thought the turbo was toast; I proceeded to pull the sucker off to find out what went wrong. When I got the turbo off I spun the compressor wheel, somehow it was free again... while I was taking the downpipe off so I could checkout the turbine a piece of metal falls out of the turbine inlet. "The turbo is screwed" to the contrary I’m one lucky SOB. The piece of metal that came out was just small enough to reach the blades, yet when it made contact it wedged the fins instead of grinding the ever-living hell out of them. The turbine was fine, now to find out where the metal came from. THE EXHAUST LINERS! On this discovery I pulled the intake and exhaust manifolds to see which cylinder it was and if removing the liner was necessary. I found that the number two exhaust liner was so loose it was rattling. Pulled that sucker to find a gap where the missing piece fit. Upon more inspection none of the other liners were loose of fatigued so I left them in for the time being. I smoothed out the port and reassembled. I know this is far from optimal but the car is currently my only transportation so I needed it running ASAP. So on to pictures!

Thanks! Yupp, they are indeed N/A pistons. It is an F54 block, but it is the N/A version with the flat top pistons. Im pretty sure the cause of the failure was the lack of precise fuel control anlong with boost out of the turbo's effiency range. Im still running the flat tops but now I have megasquirt to control my fuel and am running stock boost. The current plan is to collect parts on the side and build a dedicated turbo motor. However, I now have to deal with the issue of the exhaust liners on my p79 coming apart and destroying my turbo!

Thank you for the read! But nothing was particularly enlightening since I do infact know the liners did'nt hold in my case.lol I do realize that if I remove the liners I will have to do some blending but nothing to the effect of a port and polish or major head work. Im just removing the chance for my turbine to eat another hunk of liner. I don’t really want to remove the head again to remove the liners, but if it is necessary I will most likely pick up a P90. That way I don’t have to deal with the exhaust liners and it’s an excuse to practice my hand at amateur porting the P79. Either way, I would like to remove the possibility of foreign matter trying to destroy my turbo.

I guess I'm going to try and remove the liners. Anyone done so with the head on the car? Meanwhile Ill start the search for a P90.

Thanks, I was kinda unsure of the removal procedure. I might just source another head as Johnc says, but at the moment im not really in the market to buy another head. This motor by no means is meant to be a powerhouse. It is a budget oriented turbo venture that is planed to be replaced by a dedicated forged internal turbo motor. I just dont want to deal with the situation of an exhaust liner destroying the turbo.

Though not as impressive as aplyedmind's list between me and my dad, we currently own: 1-76 280z 1-78 280z 2-(early) 74 260z

Hello all, I’m running an F54 block and a P79 head in my turbo setup. I had an incident yesterday that involved my turbo getting jammed by a nice big piece of exhaust liner. I removed the turbo thinking that it was FUBARed. Luckily the turbo sustained no damage, luckily! So I was thinking to avoid further problems it would be a good idea to remove the exhaust liners before another one breaks and actually creates some damage. I searched and came up with nothing pertaining to the subject. Does anyone have any experience doing so?

I hate exhaust liners... More on this story later.

Bump!

As the title states, I'm looking for an o-ring type fuel rail for my L28.

It wasnt so cool at the time this was happening! I though I had eaten a rod bearing!

If thats the case, then I also have a legit Weber throttle body. Its weird that the two have different butterflies.

Does the TWM throttle body also have the weber stamping under the linkage?

Not much to update project wise. I still need to get some pictures of the megasquirt. Im holding of on installing the webber throttle body untill i can jew the pops of a non-webbed non-egr n42 manifold from one of the 280zs' we have around the shop. The plan is to smooth everything out and port the runners along with opening the throttle body opening for the webber. Well, I went to "The Dragon" Friday evening after class with a few of my buddies. My one friend brought his camera along, so we set up the tripod in the hatch of the z and shot some HD footage on the glorious road. I had a nice ride up to the cross roads of time. Then on the way back, just passed the Tennessee border I started hearing what sounded like rod knock... We pulled over imediately. Finally pin pointed the sound, turned out to be the water pump belt, It had eaten 4 of the teeth off. decided to limp it through and try to make it to the bottom of the mountain. All was going well untill after the overlook. Keep in mind this is at around 8:30 at night, The belt finaly gave. I pulled over, and removed what was left of the mangled v-belt. I had my friend luke lead, while i coasted the rest of the way down the mountain. We all loaded up in his Mustang and made a parts run to Maryville to get a new belt so i could get home. Luckily the Autozone stayed open till 10! When back and within 5 mins we were good to go! During this whole process my friend with the camera, Kody, documented. lol At the overlook: Elbow deep: At the bottom of the mountain:

I recently picked one of these throttle bodies at the local jy. Your butterfly is thick in compairison to mine! The one i picked up has the standard thin butterfly... odd

Here's a thread I made some time back... http://forums.hybridz.org/index.php/topic/83421-im-scratching-my-head-with-this-zx-efi/ As 19752802+2 said those leads go to the thermotime and water temperature sensors. As far as the other connectors, read my thread and see if it may help since the different years of usdm 280zx's had a few different variations in the connectors. Sorry I could'nt be of more help!

The car has undergone a few changes the past 2 weeks. Since the piston incident I have been researching Megasquirt. Last 2 weeks ago I finally bit the bullet and bought MSII extra, a relay board, a wiring harness, and all the other assorted bits. I got the goods last Friday, started wiring Friday night, collected the various missing sensors and materials to finish up Saturday, and had it finished and running Sunday! I’ve gotten the current map pretty close to where I want it! I LOVE MEGASQUIRT! So, today the pops and I went to the junk yard in search of some doors for my uncle’s 50 caddy. This yard was like heaven! 80 acres of nothing but old cars! Who would have though among the sea of old Chevys, Fords, and Dodges there would be any Datsuns? Surprisingly there were 2 280zxs’, a 280zx 2+2, a 280z 2+2, and an interesting roadster. I had my fingers crossed that among the 3 280zxs’ one would be a turbo but no such luck. However I did find a Webber big throat throttle body that belonged to one 280zx. Needless to say, I grabbed that for a meager price! On my way to the z cars that were in a pine thicket I stumbled across a roadster that had an interesting motor in the engine bay. The Datsun had a SOHC ka! Anyways, on to the pictures of today’s venture. Pictures of the megasquirt later!

Well, i didnt do it today ,but I installed megasquirt this past weeekend!

Im not too concerned. I know this motor is nowhere near new and I dont expect it to have 170psi of compression. The thing that really matters is if the numbers are as close across the board as possible. But yes, there is a good chance im prob going to rering the entire motor while im at it.

12 psi killed it! I broke two ringlands on the number one piston. I discovered the problem after an on boost run. I noticed a ton of smoke coming from the valve cover breather. Did a compression test and found that cylinder 1 was 70 psi while the others were 105-110. The plan is to get another piston and rings, and stab another piston in. I do plan on building a forged internal turbo motor, just not right now! Taken apart! intercooler is missing! This was after draining my intercooler... carnage carnage yet again #1 #2 #3 #4 #5 #6

I dont have much lag at all, ofcourse I have never ridden in a same sided intercooled car with minimal intercooler piping.

Lol, yupp! It works like a champ as well, 12 psi no prob! Im using 265 sohc ka injectors, I tweeked the afm wheel so It doesnt run rich when im cruzing around. Then use an FMU for extra fuel on boost! Pretty straight forward. lol

Here is mine, i ran the hot side under the oil pan like ktm. The pipe routing keeps the engine bay from being too cluttered. lol A 24x12x3 ebay intercooler 3" ebay piping kit

I havent updated the thread in a long time! I've mainly been just driving the car, Bosst got bumped up from 7 to 12 pounds. just little stuff just piddling around. The plan is to install some CRX seats soon, but working 50 hours a week has kinda put a slow on that project.