ThAt shouldn't be a problem. Maybe look at a set of long tubes for that aggressive cam

Didn't see you had a set z1 headers

They arent on the car yet. Going on when motor gets pulled. Id go long tube but I need to be able to throw the cats back on just incase I have issues with inspection (NJ). I havent had a problem yet but you never know in this god forsaken state.

You should look into EPS TB's since you're bumping the compression ratio up.

How is your build going? Also not sure bigger TB's will be useful when the intake manifold is still necked down to around 60-65mm. Valkyrie guys tested bigger throttle bodies on stock manifold and it moved the power on the curve, didn't add any.

Also, with this dead thread revival, a few NA builds are supposed to go on the rollers in the coming weeks shooting for high 300's. My time attack build will be following these footsteps. Cammed, high compression, 8k build, stay tuned! MAKE VQ'S GREAT AGAIN! :stirthepot:

Valkyrie has just gone to buying Jim Wolf built long block motors. They make 400 whp.

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True but that's with doing the HR head swap. It seems easy to get to the 400whp mark with HR heads just expensive currently and not very well documented. One of my other buddies that is basically going down the same route I am just made 370whp/300tq yesterday without a tune to adjust and dial in for the cams/pistions/headers set up. Hes hoping to be close to 400 after the tune. Also be on the look out for MotoIQ. They are doing a cams/pistons/e85/ported heads/header build in a few weeks as well.

Right on! Excited to see how this all unfolds. The best of luck to you on this journey.

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So just to get this out there, I will be trying to get out in the public more via my Youtube channel @ Austin Hertel. Most of my videos now are just fast lap videos from the weekend. Going to try to do more videos with myself in front of the camera talking about the new 2020 livery and the 2020 build plans for the off season. This should help me grow as a grass roots racer as well as get my build partners/sponsors some more spotlight. They deserve it!

Currently I am at a cross roads. 370z motor build with VVEL heads and try to get to 400whp/300wtq OR 370z w/ HR head swap and motor build to get to 400whp/300wtq. Just to leak some more info, there might be someone working on utilizing the 370z harness and ecu tuned on ecutek to control the HR heads. Previously people have been using 350z harness and ecu to make it work.

Nik Sohoritis and myself both are content with stock TBs and I personally recommend steering wide, WIDE clear of the EPS set. My set was promptly disposed of and Z1 told me they've had several sets come back. They won't reset and had my car acting way funky. I reached out to EPS about the issue and he basically told me Jon must not know how to tune.

Do what you like with your money, but EPS will never see another cent of mine.

Are you the guy that has the "hp record" that z1 tuned and video'd? I thought you had eps TB's? Did you tune on them? Did you take them back off and re-tune? I personally will not be using bigger throttle bodies on my build.

With the right amount of money, anything is possible.

Austin, good to see you here. Great job on your Gridlife participation :tup:

My assumption about engine power, with a 4.0L stroker and cams, our engines can hit 400whp, but this require a lot of money and a good engine builder, and race fuel, I am entertaining the idea of trying this route to see if my assumption are right, nobody tried this route for NA build, even for FI, nobody dynoed a built engine before adding snails.

Thanks! Ended up placing 1st in the Gridlife Street class season against much higher hp cars.

For reference, the top guys I ran with this season:
Evo9 @ 360-370whp
Sti @ 370-380whp
Evo10 @ 390-400whp
M3 @ 330-340whp
My Z @ 320-330whp

The class says nothing about engine builds :stirthepot: so guess what the plans are for next season? Haha, this is why I have decided to go down this road. Plus if I ever get tired of GridLife, I can also add some slicks and aero and jump into NASA TT. GridLife street class is in for it next year if everything goes well this off season. They wont know what to do if I have the same power as they do!

Side note: comparing data to guys making only 30-40whp more than I do could gain anywhere from 1-2 seconds down the straightaways, depending on track, that I would have to claw back from shear corner speed. Maybe this extra power will allow me to not try to kill myself through the corners haha.

Yes, that's me. I did have them on there. The car would rev between shifts, it idled retarded high on startup (cold or not), and several times when I left it running to just run in a store for a drink or somthing, I'd come back out and my car would basically be 2 stepping. It would rev and hold, and then quit. Rev, hold, and quit at about 2k rpm for a couple seconds. I switched them out for my factory set that I held onto just in case due to hearing the not so good stories about these. The car has been completely flawless since.

So, long story short, yes, the record was broken with them, but no, they are no longer on the car. I couldn't tell any difference, though.

Somebody else beat my numbers and took over the NA title anyway, but I have no plans on chasing it.

Who publicly has higher numbers than you do NA? I only know of a few race teams so far, but those are all HR head swap guys.

Sam is all I know. He's from NC. RZG tuned his car, a 6MT Q. There has been some suspicion around it due to the lack of mods on the car, but I'll send it you on ig

Wow talk about bringing my old thread back from the dead. I was going through with the build, even brought the 5k to put down on the billet crank. Just not worth the money if I wasn’t going to up the compression to something that would only run race gas, and if I want to run pump 93 I would have to run some sort of stand-alone then tuning and finder a tuner to keep up with the updates swayed me
Into going boost and just running wastegate during track events

Soho did 391whp with a built motor.

Yeah I sold my pair as well, myntuner said sell now.

*w/ a 92mm stroker crank in it.

Ahhh ok, yeah 391whp is awesome! I'd be super happy with those numbers, but I'm trying to get there without going with an aftermarket crank. Custom grind C2 cams (not the off the shelf ones), imsa spec 12.5:1 high compression pistons, vk56 valves, headers, intake porting, and e85 is the plans.

In the Pirelli World Cup. Doren Racing had to change stock cranks after every race because of the crank cranking the nose in the oil pump area. The 2nd year. They was allowed to run billet cranks.

Correct. But this was due to them pushing there rpms over 8k. the harmonics and vibration of the crank around 8100 (quoted from JWT) is very stressful and causes fatigue and eventually cracks. When you have a Nissan backed budget supplying them with 10 billet cranks, who cares? I will get around this issue by staying under 8k and running a suckerpunch billet pump/gear set. Most VQ's will make peak hp under 8k anyways.

Side note: Doran is very close to me. Check out my profile image. It is one of there front bumpers straight off there Pirelli challenge car. Haha. I've got a lot of "intel" from the Doran guys on different things they experienced, parts used, and trials and tribulations to there builds.

When a rotating mass (crank) goes up in rpms. It goes through what is call a critical stage at different rpm limits. Some worse then others. You never want to operate at one of these critical stages for any length of time. A critical stage is when a shaft starts to stress it's self. Basically going from a solid shaft to a flexible shaft. It bends and bows. The stock crank has one one these critical stages just above 8,000 rpms. Doren was operating at this rpm. This is also why you see problems with the oil pumps too that had been here.

I can see where you hit a wall and feel the lack of power, you need to get every bit of milliseconds from turns, specially with some tracks where power can save a lot of time, this is something I feel as we have some long straights. I think 360-370whp with good torque can do wonders on our car.


I think this was on a low compression pistons that has been built for boost.

You could just do an engine swap from Q60 or 50 for less money and get more performance. I understand the reliability question na vs boost but you would not need to do anything to make the motor less reliable than it already is from the factory.

Just putting it out there for argument sake!

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I believe the car was on 12:5:1

You very well might be close to 400whp. 15+ motors seems to make tad bit more power then the previous generations. I remember hearing they did some improvements in the cylinder heads.

Or he could say faq it and copy what Sasha did with his motor, swap to Hr heads and runnit on a motec m150. No regrets, ditch the vvel like most race teams.

This might work awesome for most people, but in the world of racing and classing in my case, no boost is allowed on a factory NA car. I'm trying to take my already competitive street class car and make it dominant and hard to beat. It would be rad to have boost, just don't want to deal with the hassle of keeping it running and cooled.

This is where I'm at, which is the more cost effective way to get to 400whp. If the vvel heads can take it and do it, ill keep them, if not I have to find someone willing to part with a set of heads.

It's factory 11:1 compression, just forged internals. It's a high power supercharged build they are/were working on. They were waiting on the blower, but had the engine buttoned up and just wanted to see what it would do NA since it still had the CR to make power. Customer gave the green light, so they let it eat. 391whp/315wtq

You can find HR heads on Ebay for like $500-600/set. That obviously excludes the cost of the aftermarket cams, but just the heads are something like $1,000/ea new.

I keep forgetting you are in street class and not track mod.

Yep! Arguably the most fun class to get into in GridLife. Its 100% the most competitive class and the cheapest to get into. Also for anyone not in the midwest like myself, GridLife is expanding! They are teasing going far south and further out west as well for the 2020 season. Schedule will come out after PRI this year.

If they do Sebring I’m in the street class.

This was one of the rumored tracks, but we will see! I'd love to see more 370z's out!

About freaking time. I got some z’s To go out this weekend. First time I been on the track without my Z

My all time
Goal is to run a 2:17 and under. Doran’s racing 370z time around the track. That’s gt3 times