DuffyMahoney

December 3

Thanks for posting, pretty amazing sheet metal work.

December 3

They make bronco bodies, and a bunch of people have complained about how crappy they actually are. Fit, overall shape, poor paint etc..

I guess still better then a rusted out junk car.

December 1

A fun z video I just was sent. It has my R35 coil bracket on it and has over a 1/4 million views! How cool is that.

October 8

Working on PCV again, I am going to try for the exhaust. My basic plan is, valve cover to stock pcv valve, to a catch can, then block to the catch can, catch can to the exhaust.

September 4

I really think you should move to an overhead bar.

September 4

Linkage is what I am calling the small arms between throttle bodies and the shafts.

You need to remove everything connecting each throttle to the overhead bar. Then sync. Then check again once hot.

Also blip each throttle, see if they stick or bind once hot.

You should have the cable going to a cam on the overhead bar. If that isn't what you are doing, I would highly suggest that route.

Setting butterflys is extremely difficult to do perfectly. I would print the 3D file I posted for syncing, then set each off the car. Then put each in an oven to 185 and check each again.

Do you have an injector company in your town? Have them checked for flow matching?

September 3

How close are they synced now? Are you removing linkage to do that? Are dog bones the exact same lenght?

August 4

man, how cool is that!

July 23

Have you tried clocking it any? There is an area of the stroke that it won't work in.

May 16

I am designing a DBW actuator for this DOHC now!

May 16

On 5/13/2025 at 7:38 PM, zboi said:

Don't worry PAMS is already testing a real DOHC head on cars and you will actually be able to buy it. I expect prices to be better and unlike this head it will install without a headache and an engineering team.

Its now my least favorite looking DOHC, but it's pretty darn cool technology.

May 8

Used ITBS seem to be very rare. HKS,

I would stay away from the full chinese DCOE ones. KMS takes the chinese bodies and retrofits them with better butterflies and such.

https://en.kms.vankronenburg.nl/products/throttle-bodies/bodies/throttlebody-twin

Then there are

Jenvy

EFI Hardware (probably the best designed out) Throttle blades open the opposite way, tapered bore, better throttle blade angles

Borla

OER(I would stay away from these)

ETC....

A common issue with ITB is when the engine is hot on a hot day, they tend to stick slightly open and having them return to idle doesn't work. I believe the bodies expand and cause pinching, but who knows.

May 1

I got my Datsun Z Car Series Oil Sending Unit Relocation / Remote Block done! I have only one for sale now, but more are on order. I am pretty proud of this design.

Three outlet remote oil sending unit block. Metal 3D printed out of aluminum to look stock and mimics the 240z, 260z and 280z brake proportioning block design.

Block has 3 outlets, all are 1/8 NPT. Comes with a custom length -3AN hose and one 1/8 NPT -3AN fitting and either a 1/8 BSPT or 1/8 NPT for the engine block side of the hose.

Stock sending unit on a 240z is BSPT, this will require a NPT sending unit like this. [https://zcardepot.com/products/oil-pressure-gauge-sender-240z-260z-280z-70-77?variant=32184292737137](https://zcardepot.com/products/oil-pressure-gauge-sender-240z-260z-280z-70-77?variant=32184292737137)

No sending units come with this order. Pictures of sending units are just for reference.

Link: https://www.m2racing.com/shop/p/datsun-z-car-series-oil-sending-unit-relocation-remote-block

April 28

15 hours ago, madkaw said:

Reducing vacuum line size seems to have helped the MAP reading. Looks like I might even get 60kpa at idle too!

First drive was interesting for sure. Almost stalled pulling out in traffic and rich and lean mixtures all over the table-lol. The autotune was trying to correct but some of my settings were off. I didnt stay out long because it was Little 5 in Bloomington and too many crazy kids out . Monday when everyone is at work Ill do some more tuning,

Idle seemed to increase as the engine got hotter. No heat shield yet so that is an issue

Idle increase while hot is the same issue most of us ITB guys are dealing with, I hope a heat shield fixes it.

April 18

Here is something fun/ silly I have been thinking of and finally made. It’s a remote oil pressure distribution block made to look like the stock 240z brake prop valve. I previously had a steel T In the block, that broke off and then when I was using an easy out I cracked my stock block bung. I said never again!

3D metal printing is neat stuff. I had it tumbled to look even more cast.

I run stock gauges and my ecu needs its own signal. This location allows stock wiring to also work.

April 16

On 4/15/2025 at 3:42 AM, Derek said:

Man that is so cool. Not as cool as a DOHC though. 😀 I'm for sure going to do this mod at some point especially after seeing how responsive it is. Great job!

I don't have DOHC type funds:)

April 14

April 8

I love it when a plan comes together!

Fully operational below dcoe throttle body actuator for DBW ITB. Mostly hidden!

March 20

Gonna have to use the internet for that one then.

March 19

6 hours ago, madkaw said:

Okay - you would think they are the same . Were you able to specify sizes ?

Yep, I bought a few.

March 19

I was told the subaru shims are identical, i bought from the local dealer.

March 18

Well I decided to pick a new header. I wanted the header to give my room on port 5-6 for my lower mounted actuator and also get out of the way of the throttle bodies a little more. I decided on the Kameari drag 45mm. Which I purchased through Binh Nguyen.

The header design gives me plenty of clearance for my actuator and throttles! Pretty darn happy with it overall. Prior I had a now moth balled Fujitsubo header. Which had a terrible runner design for a lower actuator.

March 16

On 3/15/2025 at 8:01 AM, Dat73z said:

@DuffyMahoney the raised aspect of the manifold is for packaging. I think l posted these pics before, but here's what you're working with on high mount turbo setups and surge tank/induction boxes (ignore the cold side charge pipe wonky angles I will fabricate a new one later). Early on I referenced the dimensions between a few other manifolds I had (SK/FET/Mik). The form is really dictated by making everything fit and function properly, and as you can see space is at a premium.

I was inspired by the FET as well! It gave almost the perfect injector angle.

I am not a turbo guy, but very nicely done.

March 14

44 minutes ago, Dat73z said:

@DuffyMahoney yes balance bar with takeoff ports in my case for BOV, timing control, brake booster, etc. The takeoff ports are separate from the 1/8 npt ports you can see on the runners which may be used later for direct port nitrous or other injection. Also modular rod holder. I'll do a proper photodump and full post later but it is a clean sheet design by Larry Asp at Revery Performance so you likely see some similarities to other manifolds he has designed including one I've seen on a SEMA Z.

The concept here was the ultimate mid-runner high clearance manifold. The geometry is such that it clears even high mount turbo manifolds such as the ProtunerZ vband custom I am running along with providing adequate clearance to run a surge tank or air box. We went through several design iterations over 2 or 3 years (I took a ~1yr break from my Z to finish building and selling a couple of other cars before starting back on this build late last year 😂) and found the ideal packaging in the s30 chassis.

Imo there are a lot of novel design features present here which are missing from any other offering on the market today such as the o-ringed balance bar, ability to isolate individual runners and sync check without pulling the airbox/surge tank, etc. I'll cover the aspects later when I get past paintshop crunch time.

I can't say enough good things about Larry but he's an incredibly talented designer and incredible to work with. I'll be showcasing more of his work soon 😁. If anyone is interested in getting one of these manifolds or anything custom made reach out to him.

Larry is a good guy and I consider him a friend. He is very talented, we talk a lot about intake design. The up and away aspect looks a lot like my design as well. Super cool stuff!

March 14

16 hours ago, Dat73z said:

Still going through prep work on the chassis but a quick turbo update.

Got the custom cnc intake manifold in and couldn't resist unboxing. I'll dedicate a post to this later when I get it fully set up but I snapped a pic on the dining room table before it goes into storage for a while 😁

Next up will be the cnc fuel system components and there are a couple of concepts I have in mind from OEM performance blowthrough cars such as the Lotus Esprit Turbo I'd like to implement and have parts machined for as well.

Very cool! Looks almost identical to my flange thicknesses. What is the bar? Balance? Then it's also a rod holder?

For some reason the picture is too small to zoom in on.

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Posts posted by DuffyMahoney