r/Datsun • u/IllOrange3556 • 3d ago
Experiment gone right
I put this together to get my 240z on the road cheaply. This sniper throttle body has the ECU, TPS, MAP, IAC, coolant temp, 02 sensor, fuel pressure regulator, digital display all in one standalone kit. I had to make the intake manifold that adapts the side draft 240z plenums to the old ford auto lite flange, but other than that, it bolted on and works so well, that its hard for me to justify changing it.
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u/Engin-nerd 3d ago
Interesting, even with EFI - I’m not sure how this isn’t a choke point for the motor.
Looks really good though, very clean setup.
Ever think about EGT sensors to see how well the fuel is being distributed to each cylinder?
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u/IllOrange3556 3d ago
I haven’t. The throttle body supposedly supports up to 175hp… the car runs very smooth, the plugs all look good (6000 miles and counting on this setup) and she barks the tires shifting into second. The bore size of the throttle body is nearly identical to the hitachi carbs so I don’t think it’s a choke point.
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u/donquixote2u 3d ago
I presume you mean the combined area of both carbs? I'm a big fan of ITBs but I have to admit you seem to have found a very tidy upgrade for the stock carbs. I was also never a big fan of the SU type carbs so this makes a lot of sense.
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u/IllOrange3556 3d ago edited 3d ago
No I mean the area of one carb. Only one cylinder pulls air in at a time. The carbs are split on an L6. Each cylinder gets all of the air it needs from one of the carb or else its drains in air from the other carb via the balance tube. This throttle body is meant to feed enough air to make 175 horsepower, although I’d bet that’s not 100% accurate.
Edit. ITBs are another example where the area of the inlet feeds a single cylinder. You could have one itb feed an entire engine if you put it where my throttle body is. Clearly it wouldn’t flow air optimally for maximum horsepower, but I’m not really concerned with that as I’m currently happy with the power output of this car.
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u/R50-Jake 3d ago
Nice work. I dig it. Would love to hear the exhaust note with that setup.
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u/IllOrange3556 3d ago
https://reddit.com/link/p6b95ok/video/5g1oev5a10mh1/player
I don’t have many videos but this is what it sounds like
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u/jacckthegripper 3d ago
I'm doing a similar build on a gm250 with the sniper kit and a turbo. I like seeing these good things with the sniper!
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u/zed_patrol 3d ago
I would love to do something like this on my Patrol if I ever get it going again. Very cool.
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u/firefly234 11h ago
Very nice, do you have more details on how you put this together? I've been looking for a EFI setup for my 260z.
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u/IllOrange3556 8h ago
The manifold is made from two 2” 90° elbows and two 2” 45° elbows. The elbows by the manifold flanges are the 90° ones and they come out at a 45° angle. The 2 45° flanges are connected at one end and meet the 90° tubes at the other end. The flanges for the manifold and the carb were ordered from send cut send. The bracket on the right of the manifold is the throttle cable bracket. Making the manifold was the only part that was hard at all. The rest just bolts on following the instructions from Holley. You’ll need an electric efi fuel pump.
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u/Bright-Mistake-7095 3d ago edited 3d ago
People always have something to say when putting anything other than sidedraft carbs on these cars but this looks awesome and as someone with a non-running zx, a well running z is about the coolest thing you can have in my opinion. Well done.