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Twin Turbo (CARB Legal) 2018 370z NISMO
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http://www.the370z.com/members/karlk...fore-after.jpg
I finally did it. I've wanted to get my car supercharged for years (see Supercharging in Cali), but was worried about voiding the warrantee and making the car less reliable. But my warrantee is expired now (early 2018 model) and earlier this year, Eugene Turkov (ByThaBay) got his Twin Turbo kit CARB tested and approved. So it was time! It's not the cheapest forced induction option, but it is pretty competitive with the other twin turbo kits. I can’t legally crank the boost up as high as those of y’all outside of cali, but it’s still pretty quick, and hopefully a bit more reliable than the old stillen kit, which is the only other kit that's CARB exempt. - kit: https://vq37tt.com/products/eac-twin-turbo-kit - install: https://vq37tt.com/products/eac-twin...t-installation It's got: - 2x Nissan R35 GTR Turbochargers (re-built by PT Turbo) - Turbowerx Exa-Pump Oil Scavenge System - Z1 Urethane Adjustable Engine Mounts - Denso R35 GTR 650cc Fuel Injectors - AAM Stage 1 Intercooler - Omni 4 Bar Map Sensor - Custom fabricated aluminum piping + black powder coat - Z1 Oil Pan Spacer - Z1 Oil Cooler I just got the car back today, just about 3 weeks after I dropped it off. Pretty quick turn around! Still need to dyno it and get the final tune. But so far the car runs pretty great! It's definitely got a monster under the hood waiting for me to let it out. Worth noting, we had to delete the NISMO body damper bar, because it overlapped with the oil cooler and pipes. The intercooler might have a little bit of the same effect tho. It's unclear if the bar is necessary off the track, but it's a bummer to lose it (it's not cheap). Will add some more pics soon! |
Well, the kit makes more power than the stock Exedy clutch can handle!
Surprisingly, the car still hit the advertised peak numbers (430/400): - 427 whp @ 6220 rpm - 406 ftlbs tq @ 4270 rpm It could have made more, even with the stock nismo exhaust, on pump 91 octane, with the cats still installed, but we found out that hard way that the Exedy clutch is only rated for 383 ftlbs torque. The power curve hits that and the clutch slips. It’s still totally drivable day to day, but it slips if you floor it. Honestly, I drove it around town for a week and never had enough road in front of me to floor it, so I didn’t notice. But I’m probably gonna have to get the JWT clutch, rated for 600 ftlbs, to get full value out the kit, especially if I want to track it. |
I just found out about this kit today, I will be following this thread. Are you driving the car now or waiting for the new clutch? I am really glad to see another CARB approved option for us, I didn't think it was possible!
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Slipped under my radar as well. Keep us up date in the progress of the build!
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The JWT clutch is installed and works like a charm! It handles all the kit torque just fine. It's a little stiffer, a little heavier, but not too bad.
I just got back from a road trip up to Oregon and Washington. Put another 2.5k miles on the Z. lol, it needs another oil change now. Destroyed a Challenger in the norcal mountains. Good times! It's great having the torque to pass just about anyone, even going up hill, and still have more to spare. The KW v2s and Potenzas did a lot of the leg work keeping me from flying off a cliff, I'm sure. The dyno trip got delayed, tho, along with a chance to film a few drive-bys. I'll post the new numbers when I have them. |
Glad to hear you're enjoying the car! Hope we can meet up next time I'm in the area.
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New oil can and washer fluid reservoir are installed!
The turbo kit originally came with 2x prototype oil cans, one on each side. The turbos are too low to drain straight into the engine oil pan, and the kit comes with a scavenge pump, but the oil cans add a little extra buffer so the oil can expand when hot or collect if the scavenge pump isn't running, without backing up in the turbo and coming out the exhaust. Anyway, the prototype cans were temporary and the new oil can is a single larger can that sits up front behind the intercooler. This way there's only one place to service that's easier to access and the piping to the scavenge pump can be more efficient. I don't have a side pic, but here's the underside. http://www.the370z.com/members/karlk...-can-front.jpg When the turbo kit was first installed, we had to delete the washer fluid reservoir to make the new piping fit. This seems pretty common with other kits too. So Eugene's been working with the guy from 370zed.com, who designed a new smaller washer fluid reservoir, and it's finally ready. Smaller than the original, but nice to have! http://www.the370z.com/members/karlk...-reservoir.jpg Both of these will come standard in the full turbo kit going forward. And it sounds like Eugene will soon be offering a smaller "tuner kit" without these and other supporting parts, for those looking for just the bare essentials. Heading up to Mendocino next weekend to get new numbers now that the JWT clutch is installed. Stay tuned (pun intended) for results from the dyno! |
Nice work, I'm interested in that washer bottle. They don't seem to have anything up on 370zed.com yet unfortunately.
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Nice build! I just finished up my build this weekend and hit the dyno! Interested to know what kind of money you spent on your build. mine is A LOT lol
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Yeah, I got the "EAC Twin Turbo Kit" I linked in the first post that has the CARB exemption (EO# D-873). I also had Eugene install it.
Prices were as listed on his website for the kit + install + tax (around $21k in CA). Then add some other odds and ends on top, like oil, oil filter, brake fluid, coolant, etc. Then I also replaced my 2018+ OEM Exedy clutch with a stronger JWT HD Clutch, along with a new JWT CSC, and resurfaced my flywheel. All together the extra parts and labor there were around $2k. But if you have an pre-2018 model, the stock clutch should be fine with the kit. Bonus: The kit was recently featured in MotorTrend: https://www.motortrend.com/reviews/e...infiniti-vq37/ The headliner pics are other cars, but if you scroll down a bit, that pic of the nismo engine bay is my car. :) |
Here’s the car on the dyno:
https://www.youtube.com/watch?v=Ix6lFG8EHiI In 4th gear, the curve looks nice and smooth and peaks at 427 whp and 407 ftlbs. http://www.the370z.com/members/karlk...o-4th-gear.png You can see that the torque is much higher than a supercharger at much lower RPMs. So it’s a lot of fun on the road! In 5th gear, it hits 435 whp and 416 ftlbs. http://www.the370z.com/members/karlk...o-5th-gear.png For comparison, here’s the stock Dyno sheet: http://www.the370z.com/members/karlk...ismo-dyno.jpeg |
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Can you guys comment on the power delivery? In terms of turbo lag (or how it compares to being NA), how the car feels in low/mid/high rpm ranges and if temps have been an issue at all. Thanks!
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The kit comes with an oil cooler included, but on 91 octane and 8lbs of boost it almost doesn't need it. I haven't taken it to the track yet, but so far during spirited driving on mountain roads it hasn't even gotten as hot as it used to without the turbos. Gets hotter in stop & go uphill traffic, heh.
You could increase the boost for the track or outside CA, but you would need to run E85 to reduce knock or disable the knock sensor in the tune (not recommended for engine health). Then the oil would probably get hotter, but probably still manageable. Turbo lag is minimal with this kit. They're R35 GTR Turbos, so they're designed for a very similar engine and sit very close to the headers. And of course, two smaller turbos spool faster than a single large one. |
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Speaking of lag, I read that the NISMO GT-R turbos were upgraded in 2020, taken from the GT3 GT-R, with 10 vanes instead of the previous 11 vanes, for ~20% faster spinup, reducing lag.
I don't know whether the EAC kit uses the newer nimso turbos tho. The non-nismo ones are certainly a bit cheaper. If not, it might make for an interesting upgrade option, if you can find them. |
Awesome new video by The Carizon out highlighting the kit and my car! It was a ton of fun cruising around the north coast mountains for the video.
https://youtube.com/watch?v=wGQYMfs5PLM |
Loved the video. You have a great car, also awesome number plate.
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Highway patrol: “you are under arrest, I watched you pull bus length on that Lamborghini, clocked you at 176mph …”
Owner, pops hood: “it’s all stock officer, no way I’m beating a lambo” Highway patrol: “you are free to go” |
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Very cool to see a kit like this on the market!!! I won’t be going boost, but man it sounds like a really good deal if you don’t want to worry about legality.
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I can only assume that you would be able to get more HP and torque with 93? If so - does anyone know roughly what those numbers would look like? Regardless great vid and seems like a great kit overall - especially for someone who might be starting the search to go boosted.
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The power difference between 91 and 93 is going to be marginal. In my opinion, I would get a 91 tune and invest in running flex fuel. The 91 tune allows you to fill up at more stations and gives you headroom for those hot days when the car pulls timing.
Boost plus flex fuel must feel insane if my NA setup has a noticeable difference. |
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There is a difference between turbo lag and turbo "hole".
Turbo hole is a rev range in which the turbo is useful, i.e. it's spooling to enough rotation that you can feel the boost build up. It's effectively the amount of gas coming out the exhaust that is building enough pressure to spool the turbo so that it spins high enough so that it can squeeze enough extra air into the engine so that you can feel it. On the above car's turbos it's very low, around 2000rpm which is incredibly cool and makes the car feel torquey. This also implies that the turbos are probably not huge. Generally, the larger the turbo, to higher this hole is, i.e. the more revs the engine needs to actually spool the turbo. Turbo lag on the other hand is the time it takes for the turbo to spool from when you hit the accelerator. Let's say you're in the car above, that's now sitting at I dunno, 90mph, at around 4000rpm. It's in the power range, it will deliver a lot of power....however, if you completely let go off the gas, wait a second, and then you hit full gas, even if you're within the power range of the turbo (in the above case, above 2000rpm), it will still take A LITTLE time, just a tiny bit, maybe 0.2-0.4s until the turbo builds up boost. It's in the rev range, meaning the exhaust gasses will spool it up no problem, but that whole chain of events does take a tiny bit of time longer than it is for example in the N/A car. Rally cars for example have the misfiring system, or the antilag, which effectively doesn't allow the turbo to lose it's rotational speed, so that the hit on the accelerator gives immediate response. |
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