400 whp on N/A VQ possible?

Elmo370z · 10-30-2019, 11:52 AM

Quote:

Originally Posted by Whjaxn17

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.

Soho did 391whp with a built motor.

Whjaxn17 · 10-30-2019, 02:01 PM

Quote:

Originally Posted by Elmo370z

Soho did 391whp with a built motor.

*w/ a 92mm stroker crank in it.

austins z · 10-30-2019, 03:16 PM

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.

Rusty · 10-30-2019, 03:25 PM

Quote:

Originally Posted by austins z

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.

austins z · 10-30-2019, 03:34 PM

Quote:

Originally Posted by Rusty

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.

Rusty · 10-30-2019, 04:06 PM

Quote:

Originally Posted by austins z

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.

Elmo370z · 10-30-2019, 11:56 PM

Quote:

Originally Posted by austins z

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.

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.

AlWakRa · 10-30-2019, 06:17 PM

Quote:

Originally Posted by austins z

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

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.

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.

Quote:

Originally Posted by Elmo370z

Soho did 391whp with a built motor.

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

Elmo370z · 10-30-2019, 11:54 PM

Quote:

Originally Posted by AlWakRa

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.

I believe the car was on 12:5:1

Whjaxn17 · 10-31-2019, 09:06 AM

Quote:

Originally Posted by AlWakRa

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

Quote:

Originally Posted by Elmo370z

I believe the car was on 12:5:1

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

10-30-2019, 03:16 PM	#3 (permalink)
austins z Base Member Join Date: Dec 2014 Location: indiana Posts: 76 Drives: @austinhertel on IG Rep Power: 74	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. Hotrodz, Elmo370z and ZontheRocks like this.