Hybridz Forum

09-08-2026 ATLAS Z UPDATE: My rear hatch "glass" (polycarbonate) ordered from Plastics4Performance in England arrived today. As I have mentioned I had them use their template for Ferrari 458 rear window vents. Why? I like the look. Great for flow through ventilation. This is an open air Z anyway. No side windows, and mostly stripped out. I got the 3mm thick one, so thin, and VERY light. It looks cloudy as I haven't peeled off the protective layer of plastic yet. Now, as they told me, some sanding and fitting will be necessary, but I am happy to report it made it across the pond and to my garage! PICS:

The first head to document will be an old E88 from my 72. I used this head a long time ago worth 40DCOE triple Webbers. In typical fashion long long ago I did my best to do what I thought was right. I blended the seats to match the bowls with a grinder, and port matched the head to the intake, opening up the port about 1" in from the entrance to blend the new opening (not good). other than that, stock valves and chambers So lets flow it. Hoping to borrow a stock E88 to compare later. Some pics for referance Here are the head Specs Cylinder 2 Intake with 84mm Bore And Cylinder #2 Exhaust with 84mm Bore I then switched out the bore to 86.5mm and tested again, here is a comparison chart of the effect of only a larger bore Sorry the image is hard to read I need to figure out how to upload better resolution pics, but you can download the PowerPoint below E88_Flow_Bench_Comparison_Cyl2_84mm_vs_86.5mm_FIXED (1).pptx

09-06-2026 ATLAS Z UPDATE: Ok, so I mounted my electric panel into the car and began wiring it up. The garage is SO HOT. I had to go inside and get a fan to blow in there on me (see pic). going pretty well! about 75% done. PICS

I've decided to build a detailed thread to document L-Series cylinder head flow testing and the results. Like many aspects of these engines, it's sometimes hard to know what to believe or how to interpret what you see and read. Test setup, equipment, testing methods, and just straight-up BS can all contribute to the confusion. I don't sell a product or service and have nothing to gain from the results I post, so my goal is to keep the testing unbiased and as consistent and repeatable as possible. Feel free to comment or criticize as I move through this. I'm happy for any input. First up is the equipment. I have a SuperFlow 600 converted to run the digital FlowCom directly to my laptop where I use PortFlow analyzer from Performance trends. This software sets up the test and aids in the data logging and reporting. It also compensates for Altitude, Barometric pressure, ect. So no math or reading of the old school manometers. Its super accurate and very repeatable. I built a L-Series specific test stand and replaceable cylinder bores to test the common sizes, 84mm - 240z , 86.5mm 280z, and 89mm - Big Bore. This has a considerable effect to the max flow due to bore shrouding, so its important to test on the correct size. This is the first place numbers can get "offset" If some guy is flow testing a Z head on his 4" Chevy bore, you bet the numbers will look good. More on this later. These bores are made of nylon and seal to the test stand with an o-ring. However any leakage can sti

couple videos the wife had taken. looking over some datalogs this morning. Car never got over 201ºF in any log that I could see. I can't find a spot in a log where the oil temp even got over 200ºF. oil pressure never dipped on any turns or hard braking. Really impressed the car didn't skip a beat. For a shakedown i was pleasantly surprised. New track for me so i worked on me as a driver rather than swings at setup changes to bandaid a driver problem but my lap times where improving fairly significantly every session and was having so much fun doing it. 20260905_111217.mp4 20260905_173624.mp4

Last weekend i got the offer to run a single day of a multi day event if I wanted to shake down the car. So i scrambled all week getting a bunch of things checked off the list. a couple days getting up at 5am and working for a couple hours before work and then to 10-11pm after work but got it so i could run it. Added a front splitter. strut bar, seat belts. fuel cell bulkhead, fire extinguisher, coolant overflow, battery tie down and kill switch, tow hook, brake bias controller, some tuning changes and im sure a few more things. But i made it. My uncle and I loaded up friday evening and saturday morning drove an hour and a half to the track. Had a great time. car was an absolute trooper and didnt skip a beat. New track for me so had some getting used to the track and the car. but i did 4 sessions problem free, I didn't change a single thing all day. found one loose bolt after session 3 that i caught before it was a problem. Car performed well. Had a fairly competitive pace by the end. Anyway. huge photo dump

09-05-2026 ATLAS Z UPDATE: Today was a light day for the car, with a few odds and ends, and getting ready to re-install the electric "panelboard" and begin tying all the wires in. Poured the antifreeze into the engine, I decided to use the DEX COOL as recommended by GM for their engines....A.I. also states it is better than regular old green antifreeze, so I went that route. I painted the cap on the radiator and put a Z sticker I had made for it, began the touch up on the hood, which....once hard, will be sanded with 2000 grit and polished smooth. I painted a couple Atlas Z brackets I had made earlier, and will install them in a day or so, and the last piece I needed for the panelboard, the batt power tie in arrived. Hopefully, I will separate the wires and begin wiring the car in tomorrow. PICS CompareCar Insurance

Haven't been here in a while, but I had no problems getting on today. Seems fast so far. Edit: Spoke too soon. Just came back on, and got an error, and when the site finally loaded after a few refreshes it seemed slow.

That's pretty much where I've ended up the last several years. I know some people prefer a staggered setup; but I really much prefer a square setup, for tire rotation and replacement purposes. Very much enjoying this build, and the ongoing discussion in this thread! 👍👍

Im looking for a parking brake handle & tunnel mechanism. Do you happen to have one? Ship to 46825 Pics and price please Thanks Lee

Nice! Back in 2009 I couldn't find a rebuilt 280z booster so I was going to buy a booster repair kit, but later figured that I might need special tools. I was able to find a rebuild shop in my city to rebuild my 280z brake booster. The shop specialized in rebuilding truck brake components.