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5.7 lt1 vs 5.7 lt4

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Old 01-11-2018, 09:20 PM   #21  
Tom400CFI
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That seems like a pretty solid indicator. When we start seeing box stock LT4's trapping 112+...then we're maybe talking 380hp.
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Old 01-12-2018, 09:37 AM   #22  
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That seems like a pretty solid indicator. When we start seeing box stock LT4's trapping 112+...then we're maybe talking 380hp.
Or cars out of the wrapper putting down 330ís to the tire.
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Old 01-12-2018, 09:41 AM   #23  
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EVERY LT4 i watched dyno back in the day was 290ís-300ís. I seen 1 ringer do 310.
If you strapped them down to an engine to SAE specs they would all be 340-350 i promise you.
Most dyno sheets were in the 300 HP range which is roughly 350 HP at the crank.
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Old 01-12-2018, 10:54 AM   #24  
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Or cars out of the wrapper putting down 330ís to the tire.
That's damns near 400 horse. LS2 C6's typically put down 340 to the wheel. So those 330 RWHP cars ought to be trapping somewhere in the 110-113ish. Yes?
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Old 01-12-2018, 12:01 PM   #25  
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That's damns near 400 horse. LS2 C6's typically put down 340 to the wheel. So those 330 RWHP cars ought to be trapping somewhere in the 110-113ish. Yes?
I would hope an LS2 would do a lil more. My stone stock wrapper 02 6spd Firehawk did 336 to the tire.
I never strapped my 05 C6 down.

Last edited by Cjunkie; 01-12-2018 at 12:02 PM.
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Old 01-12-2018, 01:51 PM   #26  
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Maybe. ~340's is what I remember seeing on these forums back in my C6 days. I'm sure a quick search would show some numbers.
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Old 01-12-2018, 03:12 PM   #27  
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I would hope an LS2 would do a lil more. My stone stock wrapper 02 6spd Firehawk did 336 to the tire.
I never strapped my 05 C6 down.
Don't straight axle cars dyno a little higher than IRS?
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Old 01-13-2018, 08:53 AM   #28  
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Don't straight axle cars dyno a little higher than IRS?
There is an extra 2-3% lost through an IRS car you are correct.
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Old 01-13-2018, 09:40 AM   #29  
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Here is my latest rear wheel dyno....and then my trap ....111mph...sometimes 112mph....BTW; the car I raced was a new Stang...wasnít stock but he came out of the hole like a rabbit... I run street tires with a 6 speed...but anyway these are real world results of rwhp and trap speeds with C4 weight anyway... I donít know what my friends 04 Z06 weighs, Comm. edition weighs...I assume lighter than my 85, but my car and his car run very similar, on the street anyway. He hasnít been to the track yet
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Old 01-13-2018, 10:50 AM   #30  
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Is ^that a stock LT4? What ever it is, nice numbers.


.

Last edited by Tom400CFI; 01-13-2018 at 10:51 AM.
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Old 01-13-2018, 10:59 AM   #31  
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No, that's my 85 in my avitar......with the mods listed below.......

its actually running about 1 mph slower in the quarter than about 10 years ago.....???

i think there has been a weight change.........the driver.....

The car remains the same over the years......not the owner!

Speculation on rwhp and trap speeds on C4's and C5's was the purpose of the post.....I know it started with LT1 vs. LT4 but the thread migrated into a general rwhp and trap speed speculation.

Last edited by 856SPEED; 01-13-2018 at 11:14 AM.
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Old 01-13-2018, 11:47 AM   #32  
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I guess I was off by about 10hp on my LS2 claim above. I recalled seeing lots of cars in the 340 range, back then...but I found these two threads
HERE (1/2 way down the post)
and
HERE

....that show the average to be around 350 RWHP. Just like to keep the data accurate.
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Old 01-13-2018, 12:15 PM   #33  
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Quote:
Originally Posted by Tom400CFI View Post
I guess I was off by about 10hp on my LS2 claim above. I recalled seeing lots of cars in the 340 range, back then...but I found these two threads
HERE (1/2 way down the post)
and
HERE

....that show the average to be around 350 RWHP. Just like to keep the data accurate.

that's about what I would have guessed on a LS2. Good post!

Got to love the newer platforms.....I know you were not thrilled with your C6, but I think they are a great platform as with the newer technology just like all the manufactures these days.....had I known what we know now back in 02 and 03 when I started this build project, probably would have second guessed it. Didn't know we were approaching the best muscle car or performance car era of unmatched levels in history.......and how long it has lasted!!

Now soccer moms are driving their minivans and SUV's with 300 horses are better.....400 hp is not as lofty of a number these days.
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Old 01-13-2018, 06:28 PM   #34  
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Originally Posted by 856SPEED View Post
...Now soccer moms are driving their minivans and SUV's with 300 horses are better.....400 hp is not as lofty of a number these days.
I like my 300 hp LT1 and it runs good.

Technology has come quite a ways though. I also have a GM 3.6 and a Chrysler 3.6. Both V6's make 300 hp. They both run better than expected and get good mpg from my full size cars. They are high 14 or low 15 second cars, but neither one is what I would call a fun car to drive.
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Old 01-13-2018, 09:57 PM   #35  
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Quote:
Originally Posted by 856SPEED View Post
Here is my latest rear wheel dyno....and then my trap ....111mph...sometimes 112mph....BTW; the car I raced was a new Stang...wasnít stock but he came out of the hole like a rabbit... I run street tires with a 6 speed...but anyway these are real world results of rwhp and trap speeds with C4 weight anyway... I donít know what my friends 04 Z06 weighs, Comm. edition weighs...I assume lighter than my 85, but my car and his car run very similar, on the street anyway. He hasnít been to the track yet
My 04 C5Z was 3055 with a 1/4 tank of fuel......very light.
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Old 01-13-2018, 11:02 PM   #36  
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very interesting scattered post. car HP VS platform VS weight
92 - 93 LT1 speed density 300HP approx 3,246lbs prev post mentioned 102mph
94 - 95 LT1 EE - EEb PCM 300HP approx 3,246lbs Not mentioned
96 LT4 OBD II 330HP Approx 3,246lbs prev post mentioned 105mph

a good track rule.. takes 10 HP ~ per MPH.. making the LT1 300HP VS LT4 330HP on queue
102mph VS 105mph +3mph = 30HP
My tuning LT1 3,246lbs traps 108.86 Datamaster dyno pulls calculate 360HP
LT4 330HP @ 105 VS my LT1 360HP @ 108 ~ +3mph = +30HP

a 98 Camaro SS ~ LS1 320HP approx 3,360 prev post mentioned 107mph
should equal around 350HP

Last edited by THE 383 admiral; 01-13-2018 at 11:25 PM.
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Old 01-14-2018, 09:03 AM   #37  
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Originally Posted by Cjunkie View Post
My 04 C5Z was 3055 with a 1/4 tank of fuel......very light.

Wow.....that is light.....I know my buddies 04 Comm. Edition Z06 has a carbon fiber hood from the factory. Might help explain the 117 mph trap speed listed in a previous post on the C5Z (assuming 405 hp).
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Old 01-14-2018, 11:02 AM   #38  
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Originally Posted by 856SPEED View Post
Wow.....that is light.....I know my buddies 04 Comm. Edition Z06 has a carbon fiber hood from the factory. Might help explain the 117 mph trap speed listed in a previous post on the C5Z (assuming 405 hp).
My car trapped 117 a lot and one halo run of 118 so yes heís spot on.
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Old 01-14-2018, 02:13 PM   #39  
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Yep, the LT4 and the LS1 that followed always seemed to be within a few hp on any chassis dyno. Both were typically 35hp higher than an LT1. That was in rear-wheel horsepower, btw. So the difference in crank horsepower would be a bit greater. And yes, the C5s were lighter than the last C4s, especially the FRCs and Z06s, which were lighter by at least 200lbs. Of course they also had different gearing in the transmission. So it's not a surprise that their times and traps speeds would be a bit higher.

EDIT: One other important difference is that the LT1/4 C4s with the manual had a 40lb flywheel, whereas the LS1 manuals had flywheels that weighed around 24lbs. That makes a real difference, especially in 1st and 2nd gears.

Last edited by MatthewMiller; 01-14-2018 at 02:19 PM.
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Old 01-14-2018, 06:34 PM   #40  
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Quote:
Originally Posted by MatthewMiller View Post
Yep, the LT4 and the LS1 that followed always seemed to be within a few hp on any chassis dyno. Both were typically 35hp higher than an LT1. That was in rear-wheel horsepower, btw. So the difference in crank horsepower would be a bit greater. And yes, the C5s were lighter than the last C4s, especially the FRCs and Z06s, which were lighter by at least 200lbs. Of course they also had different gearing in the transmission. So it's not a surprise that their times and traps speeds would be a bit higher.

EDIT: One other important difference is that the LT1/4 C4s with the manual had a 40lb flywheel, whereas the LS1 manuals had flywheels that weighed around 24lbs. That makes a real difference, especially in 1st and 2nd gears.
Matt,

I would like to see your beast's 1/4 mile times! I had the chance to ride in it on the autocross and I know you enjoy that type of competition, but I am sure your car is capable of impressive trap speeds!

As far as the C5Z, I guess I will leave the racing in bench racing form....if he traps 117 or 118, to my 111 - 112, that will equate to a solid *** whipping.....
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