I projected your tq curve downward to the 6400 mark for roughly 350 lbs and did a quick 6400/5252 x 350. Rounded up. If you can convince him to raise the limiter and dyno out to 6500, you'll see it. At the track you'll want to shift at 7200

 

This is for educational purposes. A max effort 346 on two completely different intakes. Look at the rpm for peak tq and peak rpm. Also look at all that yummy power past peak. Just cause you hit peak doesn't mean it's done...

 

Tasty curves for sure!

 

Lusting4LS1, I think the new numbers with the replaced plug look better.

If you really want accurate dyno results, I would confirm when the dyno was last calibrated. Some shops keep their equipment spot on an accurate and calibrate and others shops never calibrate.

In any case, I think your z06 will be a fun car to drive

If you want higher numbers a ported stock TB will probably help a few hp for minimum cost. Likewise a quality 92mm / 90mm intake & TB would potentially help as well.

 

I would definitely like to get a full pull done it. I've always heard that if your torque peaks before 5252rpms that the motor will have more torque than horsepower, but I agree with you, it looks like it was still pulling hp wise when he shut it down.

I dont know if I want to spin it to 7200rpms, but I think 6700-6800rpms wouldn't be unreasonable.

 

Thanks man!!!! I like the way it came out. Good all around power, still getting use to it. lol

 

I was wondering about the dyno too. There is another local dyno, but then again, I know all dyno's read different too.

I don't think I'm ready to splurge on the Fast intake just yet, but I have been thinking about a ported stock throttle body, even if its just for the throttle response.

 

FYI - comments in bold are for emphasis only and do not indicate yelling or frustration

There aren't a whole lot of hard and fast rules. Generally, the higher your peak RPM HP, the higher your HP will be over torque, because RPM = power. If you're making 350 lbs torque at 2776 RPM, it's 175 HP, 350 lbs at 5252RPM is 350 HP, and 350 lbs at 8000 RPM is 533 HP. So, pushing your peak HP higher in the RPM band almost always increases the delta between HP and TQ.

But still, the point remains, whatever your peak tq is on a NA motor, you can pretty much expect peak HP to be close to 1500 RPM higher than peak torque, give or take a couple hundred RPM. Those graphs I posted above, that engine made peak torque at 5200 and peak power at 6900-7000 on the higher curve. On the lower curve, it made peak tq at 5300 and peak power at 6500, but you can tell it hit a wall from that perfectly flat line from 6300-7000 because it had run out of intake. And that's part of the point of these posts too is to show you the patterns. Based on torque, that engine HP peaked early, because something was wrong - i.e. the intake was not allowing it to make more power for whatever reason.

In your case, you're showing peak torque at about 4800, which is EXACTLY where you should be. If you were to find a LS text book, that's where it should be. Now, add your 1500 rpm, and you should be making peak power at 6300, but your dyno run was obviously out of the throttle well before 6000. I personally think that your peak HP reading is NOT the actual peak HP of the motor - it's where the operator let up.

Bottom line, I don't think you need to find a new dyno. you've got a dyno that gave you 411 lbs of torque at 4800 rpm. You just need the operator to spin in out past 6500 before letting up on the throttle so you can see the whole curve and see it drop off some. I understand not wanting to spin it much past 6800 - you need to plan that in your build from the beginning. but no reason to fear 6800.

If it is truly peaking at 5500 and falling that fast with the throttle still wide open, then something is wrong, like valve float or the throttle blade isn't opening all the way or the intake tract is collapsing. Hope all that helps...

If you want, look up Martin Smallwood and give him a call. He designed that cam when he was still at Tick Performance. And it's a fantastic street cam. Show him the curves and see what he says - I bet it's pretty similar

 

I haven't seen this cam till now. I think the curve is great.

How does the car drive around town and in parking lots?

 

All of this makes perfect sense. Thanks for taking the time to explain all of this. That's what makes this forum great.

 

The car is hell of fun to drive. It has power everywhere. It's super touchy and revs so much quicker now, I haven't got use to it yet. I do kind of feel part throttle, like 10% , 1500rpms or below could be better. But that could be just me being paranoid. I'll have to get some more seat time to know for sure. It doesn't really like being just let off the clutch at 1000-1100rpms like the stock cam, but that's probably to be expected with an aftermarket cam. All in all, I think it's exactly what I was looking for and great to drive around.

 

What springs/rockers/lifters are you running?

 

Not sure on the springs as they were on the car when I got it. They're a double spring with stock rockers and Morel lifters.

 

Looks like the smoothing is turned up way too high. The curves are way too smooth. And he may have rev'd it to 6kish but the smoothing may have messed with the peak a little (even so, 6k obviously isn't enough).

Can you take it to a different dyno?

 

Dynoing a car while the ses light flashes at you misfiring like crazy doesnt seem like a good idea. plus youd be able to tell in the scans as well esp for ltft and stft for the fuel trims doing the off dyno street tune. it would look lopsided on wave forms trims and inj pw.

 

Very good odds they are BTR dual platinum. They get kitted with quite a lot of cams at many vendors.