J35 LoveFab Twin Turbo Time Attack NSX

[Dimer]

I have some other build threads, but since this will be something new, I thought it would be better to create a new one.

This is my race NSX in its current form:

After killing three C motors in three years, it was time for change. I have been checking the HPD NSX for some time now, but didn't know how to begin to do a J swap myself. Then David aka Velocitized came along and after talking with Cody from LoveFab the Time Attack V3 project had started!

Being based in Amsterdam and most J engines and parts and suppliers are in the US, the start of the project was a bit challenging. Luckily both David and Cody are great to work with and are very helpful! We decided to ship the mounts to Cody and Cody has picked up two J engines. With the mounts he can start building the twin turbo kit from his workshop.

In this thread we will try to post as many pictures from the build.

 

[JohnWayne]

I love your livery! Look forward to watching this build..

 

[stuntman]

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[jones83]

Good luck Dimer! For the price of J35s it is a smarter option if you are boosting. My only gripe about the J is that it doesn't sound as good as the C.

 

[99problems]

What is that tube in your cockpit!!!!????
Passive a/c!?

 

[solidol]

If there is anything I can help with (sourcing parts etc) just let me know. I hope next time I'm in AMS I'll check this car out in person

 

[Dimer]

What is that tube in your cockpit!!!!????
Passive a/c!?

It is cooling for the driver (me ). The tube is connected to a small electric turbine that is connected to the front bumper. So it feeds fresh air into the cockpit. Wearing a fireproof suit and helmet in a racecar can be quite hot and this works well

 

[jones83]

[MENTION=9673]Dimer[/MENTION] can you clear your pm box? I have something to ask.

 

[Dimer]

[MENTION=9673]Dimer[/MENTION] can you clear your pm box? I have something to ask.

done

 

[Red3ullZz]

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[clr1024]

Subscribed!

 

[OKI-BOY]

I look 4wrd 2this build.

 

[RYU]

With the mounts he can start building the twin turbo kit from his workshop.

Looking forward to your build!

Why not build a single turbo? Especially for a racecar. Less complications with a single. Is it the piping routing that makes it difficult? No more difficult than the C engine me thinks.

 

[stuntman]

Looking forward to your build!

Why not build a single turbo? Especially for a racecar. Less complications with a single. Is it the piping routing that makes it difficult? No more difficult than the C engine me thinks.

Because of the 60* V allows the turbos to be mounted higher so you don't need a scavenge pump.

 

[RYU]

Because of the 60* V allows the turbos to be mounted higher so you don't need a scavenge pump.

I believe SOS's twin doesn't need a scavenge pump either so I don't think it's 60° design is the sole reason?

If the answer is that there's no way to build a single turbo without a scavenge pump on the J, then I totally get that. Anything, even the complications of 2 turbos, is worth not having to run a scavenge pump!

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Also, to get the turbo sitting higher do most "racecar NSXs" just cut the trunk floor and stick the turbo much higher?

 

[stuntman]

60* makes it a lot easier to mount with far more room than the 90*.

Yes if you want to sacrifice the rear trunk to mount a single, a 60 or 90 won't matter or need a scavenge pump.

 

[Dimer]

Like Billy said, we have so much room with the J. Which means it can be built better.

I'm sure Cody can explain it better

Also, I'll be honest, I just think twin turbos are sexy

 

[RYU]

I hear you [MENTION=9673]Dimer[/MENTION] on the twins being more sexy

I was secretly hoping someone would say they mounted the turbo above the transmission case in a single turbo setup. That could lend itself to equal length turbo headers and not have the potential complications of a twin setup.

For longevity and reliability sake I would want this
* Single turbo above the tranny case (or turbo above the trunk floor if you're cutting up the trunk anyway)
* Twin turbo at each bank as high as needed (risk all the complications in a twin turbo setup but not have to run a scavenge pump)
* Single turbo with a scavenge pump (though at this point i'd consider not going turbo at all)

Pros and Cons either way and running a single turbo w/o a scavenge pump might not even be possible. If you can keep us updated on why/how the decisions were made that would be super cool. A lot of us are looking eagerly at your thread Dimer!

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Is anyone considering a Rotrex setup with your J Swaps?

 

[Dimer]

In the meantime, here is a picture of the two engines

 

[RYU]

Nice! Are you going dry sump or will that oil pan clear the bottom?

(i'm excited for you)

 

[Velocitized]

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Good luck Dimer! For the price of J35s it is a smarter option if you are boosting. My only gripe about the J is that it doesn't sound as good as the C.

My J32A2 sounds exactly like my old C30 once I routed the exhaust the same as the C30 (separate the front and rear banks). The J and C engines have the same firing order and the exhaust pulses are the same because both engines use offset rod journals.

 

[stuntman]

I think SOS' twin turbo setup has the turbos mounted high where they can gravity drain to the pan.

If you do a single above the transmission, I wonder how it would affect transmission temps... Most single turbo setups do have equal length headers.

 

[Mac Attack]

Dimer - Looking forward to the build! Sorry about your bad luck with the C-series. I still think your last engine builder screwed up the rod bearing measurements.

Regan - There have been quite a few kits over the years placing a single turbo over the transmission with the required equal-length exhaust banks. Autowave, AMW, and another out of Florida. For single turbos, that setup is the way to go IMO.

My compound twin turbos sit on top of the transmission too. No problems with heat, but I've done a lot of work on thermal management and have relocated a lot of stuff. I have a tranny cooler, but I never had an issue with transmission oil temps prior to adding it.

The SOS twin turbos do not require scavenge pumps but also have a horrible exhaust manifold layout to squeeze them against the heads. Our transverse layout makes it difficult to design an optimal turbo arrangement. That's why I like the longitudinal Esprit design!

Dave

 

[Dimer]

Engine mounts are in.

Two GT28R turbo's are on their way.

It's about to get real!

 

[sca037]

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Brian