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Z-Fever

Z-Fever builds RB25DET powered 240Z, very clean build

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Here at Z-Fever we build some of the nicest Nissan vehicles around. We do a lot of unique swaps and this is just one of them. We normally do the RB25 swap into the 240SX but in this case we installed it into a 240Z which never came with fuel injection. Here is a picture diary of the build. The customer shipped us the car from Kentucky, we built it and shipped it back. This is a rather common practice for us.

I hope you like it.

 

We started with your basic stock 240Z:

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Then we pulled the stock L24 engine from the engine bay and discarded it (if anyone needs a replacement engine for their Z you can call us, I will sell it to you):

p><p>Then, we had to address the oil pan issue. You see, the car uses an engine who

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Then we replaced the OEM RB25 intake manifold with a Greddy style intake. They look a lot nicer than stock and make for a nicer install because the hot side is now on the L-side of the car and the cold side is completely on the R-side of the car. Requires less piping and looks cleaner. However, the after market manifolds do reduce overall torque on stock turbo applications. The stock intake manifold actually performs better (be aware of that). BUt them sure look a lot nicer!

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L-Side eng mount:

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Our customer wanted to keep A/C (thanks God!) so we made custom a/c lines by welding the ends that came on the a/c compressor lines to the stock 240Z lines. Basically making hybrid a/c lines...

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Then we had to make the intercooler fit the car. We did not want to cut any of the factory sheet metal soooo..... We decided to fabricate the ends of the intercooler where they would line up with the openings on either side of the radiator.....

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In retrospect I would do the end tanks a bit nicer and smoother. BUT, these worked well and fitment was perfect. In the future we will make the end tanks differently. Don't beat us up here. We were given the intercooler by our customer because he was trying to save money and already had the intercooler himself!

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Then we made the piping from teh turbo to the intercooler and the intercooler to teh throttle body...

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Then we moved to the cooling system.... We used a 3" core aluminum radiator made by CX Racing for the 300ZXTT. We did have to move the outlet to the passenger side and make the mounting points to from the radiator to the front radiator support. We also mounted a set of Flex-A-Lite 440 dual electric fans for ubber efficient cooling capacity....

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We used the stock RB25 transmission and this one was extremely clean...

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Then we moved to the exhaust system... The stock RB25 turbo elbow cleared the steering shaft so we made the actual downpipe...

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Then we made the complete 3" single side exhaust system ourselves. Noone make these for the Z chassis. It is 100% T-304 stainless steel and 100% mandrel bent with a tuned muffler... You should here this RB sing when revving up!!!!! Sweet music to your ears...

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Now, the job is almost finished... The engine is installed, the intercooler is mounted, the piping is done, the exhaust is done, the cooling system is done, the a/c is finished, and we also made a custom driveshaft....

The wiring is done by us here in house also... We use the stock RB25DET wiring harness and ECU initially. Then the customer decided he wanted to be able to tune the car in the future with larger injectors and turbo so we switched out the RB25 harness and used the Z32 harness and wired it up using the Z32 MAF and ECU... They work 100% perfectly and are fully tuneable...

Here is how the whole product looked when finished:

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Then our customer decided he wanted us to make all his gauges work however the OEM 240Z gauges will not work. The speedo is mechanical on the car and uses a speedo cable. The RB's trans uses a digital (voltage) signal to generate a speed sensor reading. They are not compatible. The same is true for the tachometer. Car's is analogue and engine is digital....

So, we purchased all white digital gauges from Autometer that fit the factory dash sizes and installed them and then wired them all up. Pay special attention to the gauge in the L-side a/c vent.... It is the boost gauge. I think this is pretty cool!

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The finished gauges

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Everything fit under the stock hood perfectly. You can't even tell the car has anything done to it from the outside until you start it and she takes off... The stock turbo with the Z32 MAF and OEM injectors only put down 260whp but when we upgrade the turbo and injectors those #'s will go way up. Even at these #'s the car is extremely fast. Especially considering that the stock L24 only put down 140hp and approx 90whp.... The 260whp is almost 3 times what was stock and the car is only 2000 Lbs...

 

I hope you like it..

Doug

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hi mate, im in Aus almost finished the same conversion, but a question with the autometres.

 

ive now got an electronic speedo and was wondering how u hooked up the speedo drive?

 

a pulse sensor or something on the tailshaft? if so, what model is compatable?

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Nice work on the swap. A couple of things I noticed:

 

We had to make a custom oil pan. We chose to simply cut off the upper flange that mates the pan to the block and rotate it 180 degrees and we weld it to the flange.

 

Care to share the pictures of this?

The oilpan was built with the engine mounting angle in mind.

Flipping this pieces would result in a severely deformed oilpan possibly starving the oilpump.

 

In retrospect I would do the end tanks a bit nicer and smoother. BUT, these worked well and fitment was perfect. In the future we will make the end tanks differently. Don't beat us up here. We were given the intercooler by our customer because he was trying to save money and already had the intercooler himself!

 

No endtank fabrication required here! All thats needed is a cast aluminum 3" elbow, a welder, and a saw.

 

We used a 3" core aluminum radiator made by CX Racing for the 300ZXTT. We did have to move the outlet to the passenger side and make the mounting points to from the radiator to the front radiator support.

 

This is a crossflow rad. By doing what you have done you are basically pumping the hot coolant through the endtank. There are dual pass crossflow rads to solve this problem, or perhaps a stainless steel or aluminum lower rad pipe would be a wise choice.

 

Then our customer decided he wanted us to make all his gauges work however the OEM 240Z gauges will not work. The speedo is mechanical on the car and uses a speedo cable. The RB's trans uses a digital (voltage) signal to generate a speed sensor reading. They are not compatible. The same is true for the tachometer. Car's is analogue and engine is digital....

 

I have ALL of my factory guages working in my rb swap. For the temp sender the stock rb26 one works.

OIl pressure, use stock L series sender

Speedo, GTR tranny uses cable speedo, some machining and it will stuff into the z32 tranny, not sure how it is for rb. I dont guarentee itll read right.

For tach, Use autometer or any cheap auto parts store tach (0-8k 270 sweep i think), Remove electrnics and needle from it and install into stock rb tach housing, use tach adaptor with rb ignition coil wiring. Viola!

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