Re: C7 Vs Old Blue
 

I'd guess it would be pretty easy to get to that power level starting out with 460hp at the crank. I'm thinking headers/exhaust and a K&N would probably do it.

Re: C7 Vs Old Blue
 

Yep. That is what I was thinking too.

Re: C7 Vs Old Blue
 

I ran the C7 for three days at Spring Mtn in May and was blown away. Lot of soul searching in the days that followed about what to do, but I decided to keep ol 91#666 and have her upgraded to 510 over the winter. We are blessed to have these kinds of options, especially when I consider what I had to settle for in a new Camaro back in '75. There are the good old days!

Re: C7 Vs Old Blue
 

Dont forget the GEN 5 SBC LT1's massive torque, that matches the GEN 4 7.0 427 LS7 engine until 4700rpm.

Also the GEN 4 SBC LS7 and GEN 5 LT1 SBC's use the independently verified and totally manufacturer optional "SAE Certified Power" with SAE J2723. Originally the GM GEn 4 SBC LS7 427 in the C6 ZO6 (and now the 2014+ Z/28 Camaro) was rated at 500hp/475lb/ft torque. Then after "Certified" SAE testing was completed the final spec was 505 sae Certfied hp and 470 lb ft torque.

The GEN V smallblock Chev carries RPO LT1 and is rated at 460 SAE "Certified" horsepower@6000rpm/465lb/ft torque@4600rpm with optional exhaust.
or
455hp at 6000rpm/460 lb/ft torque at 4600rpm with standard exhaust.

I wonder what the LT5 would do with the 2006+ "Certified" spec?



Lingenfelters chassis dyno shows the following
On LPE rollers the Stingrays LT1 put down 416 rwhp and 416rwtq. This car was equipped with the new 7 speed manual transmission.
http://i1202.photobucket.com/albums/...rn/LT1dyno.jpg
http://i1202.photobucket.com/albums/...rn/LT1dyno.jpg

These Direct Injected engines are begging for boost, the GEN 5 C7 ZO6 with its 1.7 L blowers is going to be a beast. 650 horsepower at 6,400 rpm and 650 lb-ft of torque at 3,600 rpm.

A base C7 Vette, doesnt have the looks IMO. You will have top spend some serious cash to make them look decent.
You can always just take a spray bomb of some Plasti-Dip to it though.
http://www.youtube.com/watch?v=GQJo-gSChFI

Re: C7 Vs Old Blue
 

I wonder why there is such a difference between the torque and power output on your buddy's dyno? The LT1 is rated at 455or 460 sae "certified"hp and 460 lb/ft torque.

You think that since the engine power/torque is almost exactly the same, taht the rear wheel numbers would also match, or be close?

Thats the thing with comparing chassis dynos, no 2 are the same.

Maybe it was an automatic thing?


XXXXXXXXXXXXXXXXXXXXX
OP Nice kill, gotta feel nice.

Re: C7 Vs Old Blue
 

Some analysis, just for consideration here...

A "typical" ≈ 510hp 5.7L LT5 w/ stock cams

http://i185.photobucket.com/albums/x...T510-19-10.jpg

comparing to the C7 LT1

http://i185.photobucket.com/albums/x...ps72b4c85d.jpg

To make it simpler, I took the liberty of converting the mph to approx rpm (simple proportion assuming torque/power crossover at 5252 rpm @ 118 mph):

MPH Aprox rpm

40 1780
50 2225
60 2671
70 3116
80 3561
90 4006
100 4451
110 4896
120 5341
130 5786
140 6231
150 6676
160 7121

This could explain (again) why the LT5s come into their own on the "big end" of the quarter mile or even half mile contests... Power under the curve!

Re: C7 Vs Old Blue
 

Automatic would be my guess....through a manual the torque would be closer to the 420.

Brad

Re: C7 Vs Old Blue
 

Thanks for doing the MPH/RPM conversions, much easier to compare.
The 510hp packaged LT5 certainly outpowers the stock GEN 5 LT1.
'Power peak of LT1 is 6000rpm, roughly 6700rpm for the modded LT5.

Modded LT5 is down over 25 lb/ft at 2000rpm.

At the torque peaks the LT1 is up 39 lb/ft torque with 416 rwtq at approx. 4700rpm LT5 is 377 rwtq @ 5000rpm. The LT1 does have an extra 26 cubes though.

Another consideration is weight. The C7 Stingray curbs out at 3298 so 3300lbs. The only ZR-1 spec I could find was 3505lbs, with the non-ZR-1 coupes specced at around 3300-3350 lbs.

I will give the GEN 5 6.2l/376cid credit though. The GEN 5 6.2 LT1with 465lb/ft@4600rpm comes within 5 lb/ft torque of the GEN 4 LS7 and its 470 lb/ft torque@4800rpm.

GEN 4 LS7
http://i1202.photobucket.com/albums/...ps2cf55a9f.jpg


GEN 5 LT1
http://i1202.photobucket.com/albums/...psd2f0c6de.jpg

GEN 3 LS6 vs LS1 vs 90 LT5
http://i1202.photobucket.com/albums/...psd367e4bc.gif


The LT5 sure hauls the mail up where the revs are fun, 7 grand sounds like heaven.

Re: C7 Vs Old Blue
 

When I had my SGC475 package done AAron did a before and after check on the dyno on the before the hp and torque peaked at about 5300 and started dropping off through 7k. After the hp and torque kept climbing through 6500 and leveled off through 7k but did not drop off.

Re: C7 Vs Old Blue
 

My philosophy is to go after the low hanging fruit the manufacturer left on the table as a compromise for economy, emissions, insurance against octane mis-fueling, etc. Maybe at the most, a little cam and porting depending.

In the case of the C4 ZR-1, I think they are great as a 440-450 (crankshaft) hp stock displacement car. It is going to get real expensive if you see the vehicle out of this frame of reference and try to make it better than a newer generation.

I like the smooth torque delivery that doesn't just burn off the rear tires as it seems to make the car safer and so long as you realize you are on early 90's braking technology, can be kept withing a reasonable limit. If you want to best the newer cars, you would need a lot more than just a power increase and if you do the math, sometimes buying the newer car makes more sense. I gotta wonder what a 400 cubic inch LT5 runs like though, but not comparing my 91 to other generations, I do enjoy the reasonably modern power level it delivers, but mainly the extended torque curve 4 valves per cylinder brings.