Can you get to 400 without turbo or super-charger

Crash

Forged Crank, Forged piston heads, higher compression (maybe in the 12s), BIG cams and matching heads, good intake, full exhaust with test pipes. Should be good for 400. It's harder to get lower displacement motors to higher HP without FI or Nitrous.

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

Crash

^^^ Interesting. I don't totally agree with your "turbo shenanigans" description, but I do know what you mean. I DO think it'd cost about the same to make the car 400whp N/A as it would to make it 500whp through FI. BUT, that's because 400 is a HIGH number for a small displacement motor.

Also, I just thought about it, why not bore and stroke? Make the car either a 3.8 or a 3.9 (or if you're crazy, a 4.0) and THEN go for more power. Obviously the 3.8 parts are already around.

I know what you mean about having the power when you want it, but a good turbo setup doesn't have to take forever to spool. In fact, with a lightweight flywheel the turbos spool a bit quicker, and to make the 400-500whp mark, you don't need big turbos, so they'd spool even faster.

Just a thought.

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

RCZ

It of course doesn't have to be so bad of an experience, I know. I just see people thinking you can slap turbo kits and keep driving the car like nothing happened. I mean it is possible and it does happen with well designed kits, but all inclusive kits are going to run you upwards of $10,000 all said and done. Of course the potential of a turbo car is MUCH greater, there is no denying that.

I wouldn't mind a 4.0L.

You can't have your cake and eat it too though. 500whp is almost twice the stock whp. You can't run very small turbos to get that kind of power unless the compression is really high, which you wouldn't do because you would end up blowing up. So you would have to get lower compression pistons at which point the setup wouldn't make as much power with the smaller turbos and you would have to get bigger ones to do the trick. I don't know where the limits of the stock block are as far as boost is concerned. That is why we have those guys who are in a hurry to be the first to have turboed Z's to do all the experiments before we do . I would assume a pair of GT28's or 30's would do the trick for 500WHP. I would expect full boost with those on the 3.7L engine with lower compression internals @ 3700RPM. 18-21PSI. With stock compression, 500whp...12PSI @3300rpm with twin 20G's.

I'm still with Q_USAF though, I like the idea of a free revving N/A responsive engine..hope it makes power

Intake
Headers
Exhaust
Cams
Heads
Intake Mani
Flywheel
Tune

Q_USAF

These are only estimates based on a average from the various manufacturers in terms of horse-power. These bolt-on's are available now or coming soon.

1. Intake - 8 - 12
2. Exhaust - 10 - 16
3. Headers - 8 - 10
4. Race pipes - 5 -7
5. Pulley 9 - 15
6. Fly wheel & Clutch - 8 - 10
7. Cams ???
8. ECU Flash - ???

Any thoughts??

BoBoTee

There's only one cam in the VQ's head and that's the exhaust cam. The traditional intake cam is no longer available. The ecu controls the duration of the intake cam. CRAZY!!

AlexRaymond19

i was reading the owners manual the other day, i was pretty sure the displacement is near 3.8 already. Its like 3.783 or something. I could be wrong...

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2010 370Z Touring MT | Stillen | Motordyne | Momentum| Z1 | Fast Intentions | Advant Garde | RE11 | Swift | SPC | Quaife | Whiteline | Evo R | 322RWHP 259ft-lb Mustang

ChipsWithDips

No it's actually slightly less than 3.7: 3,696 CC
Bore and stroke = 95.5 x 86.0

If it was 3.78 they would have rounded to 3.8.

Crash

^^^ MORE actually. Keep in mind, every mod makes the other work better. CIA may help to make 8-12, but add a light weight fly wheel and flash and that CIA is pushing 15-18 on it's own.

However, 12PSI on GT28's is going to spool pretty quick. A friend of mine has dual GTK350's on his 300zx and they spool pretty fast with his light weight flywheel and 3" exhaust. His setup is designed for 600whp, but he doesn't push it that high. Usually keeping it around 450-500.

I'd love to have 500HP N/A. But I don't see it happening without a seriously silly cam set with this 3.7L.

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

Crash

Are you saying that the valves are controlled by a servo set?

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

BoBoTee

The intake valve opening and closing events are actuated by Nissans VVEL system. This complicated system uses a rotating eccentric activating a rocker arm with a moving fulcrum which can quickly change the motion ratio of the eccentric to the rocker. This gives the ability to steplessly change the duration and lift of the intake valves on the fly. The command authority of this mechanism over valve moment is great enough so that controlling valve opening is the primary means of controlling the throttling of the VQ37VHR, instead of the throttle itself. 370.com

BoBoTee

Somehow, somewhere, somebody(tuner's) is going to crack the VVEL. I'm guessing they can tune the ecu to increase the duration through the use of VVEL and replace the stock exhaust cams with more aggressive aftermarket cams.

BoBoTee

The head is where it's at. That is where N/A's can make the most power.

Crash

Geeeeez. OK. So a silly tune? Can we hack this thing? (Well, I'm sure we CAN hack it. I guess the question should be HAS someone hacked it yet?)

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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary

marcussoori

Is this (the complexities of the VVEL system) why it's taking so long for Cobb and other companies to release ecu tunes for this car?

RCZ

A lightened flywheel will not add hp. It might release a little rotational mass which is going to be the equivalent to adding hp, but the change itself doesn't add HP.

I just put flywheel in my answer for responsiveness sake, not for power.

BoBoTee - great info.