TimO

Has anyone found center caps for the RB/RB-R 4x114.3,17 that fit all four wheels on our Z's?

Great work!!!!!

Rossman The displacement is 3.1. I kept the bore to 88mm to avoid wall flex under high boost. I could have gone to 89mm but what I wanted was longer stroke not necessarily more cc. Before I went to the LD28crank offset to 85mm I ran a stock L28 crank. I was also running the GT35r. Same as you. GTX35r came later. With the GT35r I didn’t have issues of top end breathing. It pulled hard to 7400. What are your cam specs? What a/r are you running on the GT35? Has the head been ported? Have you ported the exhaust manifold? 3 inch exhaust? Its all about flow. Air flow makes power. PSI is a measure of air flow resistance. If you treat your engine build as if it’s an NA and to get the most flow possible THEN the turbo application will make big hp/tq. By the way, a stock L series turbo exhaust manifold will hit a wall at 6400rpm unless it’s ported. Runners 1-2-3-4 all come together and are chocked down by a very restrictive narrow merge into the flange collector. Opening that up helps a lot. Good luck.

Yaseen2492 I don't have any videos but I have some pictures. I'll try to get them up in the next few days. Theatriks Yes I mentor guys. I do it offline. If you're interested send me a pm. I've been working on Z's and 510's for over 45 years (yes I'm an old fart).

Also known as a money pit.....

My engine is a 2.8 F54 block bored to 88 mm, diesel crank offset ground to 85mm stroke, custom JE pistons, custom Eagle H beam rods, P90 head ported by Gerolomy flowing 214 cfm @.550 lift Intake, 153 cfm @ .550 lift Exhaust, custom Isky cam .540 lift both sides 270 duration both sides 109 lobe center, custom turbo exhaust manifold, Garrett GTX35R T4 .82, TWM ITB’s, TEC3r engine management, 10 lb aluminum flywheel, SPEC stage 5 double clamp clutch, T5 tranny with a G Force gear set. The engine is surprisingly docile with virtually no lag. It's important that everything is sized and working together and the beast tuned correctly. I run anywhere from 14 to 21 psi on the street. The key to hp and torque is air flow and with this set up the engine makes so much power at 18psi that I rarely run up to 21 on the street even with sticky 275's on the rear. If you want more specific info pm me.

I've had great luck with SPEC clutches. I'm currently running on my L series motor their stage 5 full metallic unspring hub full face disc. Surprisingly smooth and it's bulletproof.

450+ rwhp is very doable in an 2.8 L series motor without meth injection if it's tuned correctly. I'm pushing 600...no meth inj. To get good reliable rwhp it's all about air flow. My only suggestions in addition to your proposed set up would to look into a good turbo cam (lots of posts here on turbo cams) focus on lift not duration, lower the static compression to somewhere around 7.5-7.8, and port the stock turbo exhaust manifold especially where 1-2-3-4 converge. I don't know Holset turbos. I work with Garrett. Just make sure your turbo supports your hp targets. Next steps would include a drivetrain that safely handles 450+ rwhp, lightened/aluminum flywheel, clutch, trans, larger driveshaft with solid u-joints (Spicer 1310), and upgraded rear axles, cv's etc. Good luck and have fun.

Old worn out ball joints (and other front suspension bushings) will accentuate an out of balance condition. Ask me how I know!!

Used blocks are cheap. My 3.1 was built with a block I found for free!

Welcome. If you're are ever in the Nevada City area, give me a hallar! I've been working, modifying and racing Z's for over 40 years. Original owner of a 72 240z. Father son project....Good for you! I too had a father son project project, my son's first car, a 71 510. Our project launched my son's mechanical engineering career. Great times. Great memories.

Saw this on ebay. http://www.ebay.com/itm/Datsun-Z-Series-240Z-/231689400803?forcerrptr=true&hash=item35f1c3b1e3&item=231689400803

After years of putting 400+ hp through my 240z with stock stub axles, one of mine snapped during a uturn. After my experience I wouldn't even pose your question. I was lucky. don't over think it. For your own safety upgrade your stubs. Think about what a cv flailing around can do to the rear of a z. Next upgrade consider cold forged solid ujoints! Relatively speaking they're cheap. I just hate to see guys go cheap on safety parts. You ultimately loose. A strong drivetrain gives me piece of mind when I drive my z hard. Not trying to tell you what to do. Just my 2 cents.

I received this e-mail from Wes: "The rockers are machined from 4140 billet and the pivot cup is nitrided. the cost per rocker is $290 + GST. you would also need a roller cam and valve train components to suit. Thanks wes" I'll send him a note asking that he post here to answer questions re weight, spring rates, etc.

Yesterday I received this e-mail response from Wes at wes@wesengines.com.au sorry for the slow reply i was busy with the winter nationals last week. I do make the rockers for the L series. I am currently out of stock and would need to get some up to date pricing on the parts required. Would need to know 4 or 6 cyl, application and cam profile that you were wanting to run. thanks Wes

I'm passionate about Datsuns and I probably should have posted this a few years ago. I’m an original owner of a 72 240z. I’ve worked on Z’s and 510’s for over 45 years and I’ve been a member of Hybrid Z since 2002. Yet I rarely post on HZ. Why? Because of the push back from inexperienced “my brother in law’s friend’s cousin says” challenges to innovation and experience. Personally I don’t have the time or inclination to justify my advice and experience. Over the years I've noticed a number of very talented and experienced HZ members drop off HZ. As a result we all lose their experience input and guidance. To me the big question is how do we turn this around so the young and new to Z’s enthusiasts continue to be exposed to the experience base that has stopped or now rarely post on HZ?? I don't mean to imply that HZ doesn't currently have a highly experienced community of posters. Only that many who could offer much experience and advice don't because of the push back. I don’t offer my comments as a complaint but more as a challenge to the HZ community to turn this around. I know many will not agree with me. This is merely my personal opinion and I hope I haven’t offended anyone.

Great looking Z!!

Derek, this is amazing work. This is one of the most exciting developments for the Z in many years. Hopefully it will bring back some of the lost interest in the L series motors. My only concern is if there is a sufficient market of actual buyers to make this economically viable. Thanks for taking the risk and doing such great work for all of us Z'ers.

Still available? Interested in a fiberglass set without speaker option for 72 240z. Thanks!

Ahh the TimZ and TonyD team causing trouble again....

Check out Napa Auto Parts part number ECH KS6690 Good luck

Come on Derek, can't you just make a clone of yourself to work exclusively on the 4 valve head

This might work. Grade 10.9. 30 mm long (they also have 25mm), 14mm head Check out part number BF10X1.25X30 - Flange bolt 10.9 at https://www.belmetric.com

Try ttps://www.belmetric.com

Nice write up!