Stock dyno ZL1

[MauriSSio]

Originally Posted by Drake Heminger

Man thanks for sharing your number with both vehicle and I'm VERY convinced the Z is pushing well over 600hp... Numbers don't lie is what they always say!

trap speeds are numbers are as well. At the moment they are not indicating 600+HP IMO. to run 118ish mph in a 4100lbs car should really only take maybe 480rwhp tops.tops.

[radz28]

Originally Posted by KKreme15

The LLT was revised up 8 HP. Numbers can be off 1-2%. 8 is 2.5% of 312. To say they underrated the engine 30 HP when you have just as many dynoing in the 470 range as you do around 515 is ludicrous.

Look - I just gave evidence that it has happened relatively recently. Don't call someone out, then get shown the evidence, then discount it. It doesn't work like that.

I never said I claimed a particular difference. In fact - I made a point to emphasize a broad range so far.

[radz28]

Originally Posted by MauriSSio

trap speeds are numbers are as well. At the moment they are not indicating 600+HP IMO. to run 118ish mph in a 4100lbs car should really only take maybe 480rwhp tops.tops.

This is what I'm thinking - maybe. What is about mid-teens in a 4th Gen - about 400, or so, in a 3600-pound car? A lot less parasitic loss, too. Aerodynamics are a lot different, too. Having downforce might play a tiny role at the top of the track - I'm not sure it's that much, but it might be something to be considered, a tiny bit, too.

[Bob Cosby]

Originally Posted by radz28

...Considering I found SAE documents in our Wiki from the '10 LLT (http://www.camaro5.com/forums/wiki.p...pecifications&), which GM admitted was "underrated" and changed to 312 in '11, I'd say there might be a possibility of, perhaps, something similar here. That's not to say that I necessarily believe it, however, it does leave a little doubt.

This is actually a valid point. It doesn't prove or provide any evidence of anything concerning the ZL1, but it does show the possibility of at least a small amount of HP shenanigans. For example, GM could be claiming the low end of the rating (ie....the bottom of the 1-2% varience vice the middle or the top).

[radz28]

Originally Posted by Bob Cosby

This is actually a valid point. It doesn't prove or provide any evidence of anything concerning the ZL1, but it does show the possibility of at least a small amount of HP shenanigans. For example, GM could be claiming the low end of the rating (ie....the bottom of the 1-2% varience vice the middle or the top).

Precisely! I'm not claiming that it might be anything significant, but there is a remote chance. I think it's probably fair to say that GM probably expected a power bump for the Imp, but I don't know that it was as much as early reports. Maybe they could have left a little on the table and then pulled an '11 LLT.

Dynos' are going to vary a lot, and there are just too many variables. Just leave it on the track

[Bob Cosby]

The chassis dyno is a great tool - for tuning and gauging the net gain/loss for modifications - but not for much else. The track is certainly what it all comes down to, but once again for comparing numbers, there are even MORE variables than the dyno, and thus it really needs to be car on car at the same time at the same track with driver's of similar skill level.

As for the ZL1 itself...once again, given the SAE certification....I'm sticking with that number (even if that number is the low end, its still the best DATA available).

[SlingShot]

Here is another theory that would also work in the high RWHP debate. There are two methods when certifying the engine power. There is the preferred method of with all accessories attached, or the 85% efficiency rating without accessories.

Say Chevy opted to run their test on the 85% rating version. They would then run the said test by the guide lines of the test, with a result of a gross HP rating of 683HP. They would then take 85% of the 683HP giving them 580.5, for their certified rating of 580HP. Then lets say they take and add the accessories and they only create a 10% frictional load leaving around 615HP at the crank. Using the typical 20% frictional driveline loss for an Auto would leave you with 492 RWHP ...

Without knowing all the variables, there is no way of really knowing but it is fun to bench race and pass the time away ...

[Rice Killer]

Originally Posted by drobbins2

lol

https://en.wikipedia.org/wiki/Redpill

Haha, I figured it was something like that. I couldn't pass up the oppurtunity though.

[KD Innovations]

We are working on making a lot more so it really will not matter soon enough.

The car begins receiving the intake build next week and will then start on the heat exchanger prototype with high volume pump, then a ported blower, throttle body, a KDi Track Sweeper cam and pulleys. That will be a good start and I think will produce nice numbers.

[assasinator]

Originally Posted by SSSylentZL1

Where in Tn can one receive a Dyno

there is a conservative SCCA shop dyno in smyrna.

shop specializes in chevrolet's.

[KD Innovations]

Dynospeed in Memphis. Ask for Josh.

[SlingShot]

Looking forward to what this thread brings us today, in the great power debate ...

Makes for some good reading.

[HPT BANDIT]

Originally Posted by SSSylentZL1

Where in Tn can one receive a Dyno

I don't know which part of TN you're in but there is a couple Dynos in Knoxville and Chattanooga.

[Bob Cosby]

May I ask what shops in Knoxville?

Thanks!