Dynamometer Results & Comparisons - weakest h/c ever?

AI cnc'd 243s
ms3
p/p tb
lid
headers, ory, hooker catback
415/380

I only picked up 30rwhp going from 853 heads to the ported 243s....I was hoping for 430 with this setup.

30rwhp is a good gain honestly. Seems right to me for LS6 intake and ported stock TB. Seems like an honest dyno, not an internet hyped up dyno queen.

What tires, gear, wheels, MAF, trans, flywheel?

What size are the inj?

True duals will get you 430rwhp

Are these numbers after timing was pulled for the 100 shot listed in your sig? That's another thing to consider.

Auto, M6? Stall unlocked on dyno, clutch slipping?

What kind of dyno? What was the WOT AFR and timing?

Fuck dyno numbers, they can be all over the place. Take it to the track and see what it traps, assuming its tuned properly.

30-40 hp from those heads are about right.

30rwhp is a good gain honestly. Seems right to me for LS6 intake and ported stock TB. Seems like an honest dyno, not an internet hyped up dyno queen.

What tires, gear, wheels, MAF, trans, flywheel?

18" rear wheels with 315 m/t, 342 gears, tuned SD so no maf, stock M6 trans, stock flywheel

What size are the inj?

42lbs

Are these numbers after timing was pulled for the 100 shot listed in your sig? That's another thing to consider.

no I have a IAT mod to pull the timing. Car made 518/500 on the 100 shot.

AI states 20-30 wheel gain from the port. And going from the 853 head to the 243 I was just expecting to make more I guess. I understand the dyno is just a tool...

18" rear wheels with 315 m/t, 342 gears, tuned SD so no maf, stock M6 trans, stock flywheel



42lbs



no I have a IAT mod to pull the timing. Car made 518/500 on the 100 shot.

AI states 20-30 wheel gain from the port. And going from the 853 head to the 243 I was just expecting to make more I guess. I understand the dyno is just a tool...

This will not help you get more rwhp on a dyno. I did 404 with a ported FAST 92 combo, lightweight flywheel, stage 3 243s, U/Ds and other similar boltons as you. So youre not the weakest H/C :)

But I dont care cause my weak H/C/I is capable of 117-119 on the 1/4..

I gained 55 rwhp from the addition of AI 243s over stock 241s. I had a Fast 92/NW 92 though.

still a 500 hp ls1 is a fast car!!

Dyno numbers areNT everything, but you should be over 400rwhp or close to with the MS3 on stock heads alone.

Got a Graph? Mustang Dyno?

different results. I would look at your 1/4 mile times and go from there.

you should be over 400rwhp or close to with the MS3 on stock heads alone

On a car that made 270 at the wheels stock? 130 horses with an MS3 and headers? Man, I don't know about that.

This might be a dumb question, but you retuned with the new heads?

Are both dyno numbers from the same place? If not, forget about it; if so, as the other folks have said, dyno numbers are a pretty arbitrary thing. You aren't going to tape your dyno sheet to the windshield; does it FEEL fast? If so, why sweat the dyno sheet?

C

Are these numbers after timing was pulled for the 100 shot listed in your sig? That's another thing to consider.

Yup!, Didn't see his sign but I'm thinking that's why as well now

This might be a dumb question, but you retuned with the new heads?

Are both dyno numbers from the same place? If not, forget about it; if so, as the other folks have said, dyno numbers are a pretty arbitrary thing. You aren't going to tape your dyno sheet to the windshield; does it FEEL fast? If so, why sweat the dyno sheet?

C

yes it was retuned, and the dyno was from the same place.

Yup!, Didn't see his sign but I'm thinking that's why as well now

I have a timing box for my spray....

I think those are realsitic numbers, not low. This is my graph of my old 346 setup that is very similar to yours.

I had a 346 stock bottom end ls6 intake, full boltons, stock rear 3.90 gear locked 4l60e converter(4000), TSP ported LS6 heads, 235/243 cam

My car is full weight and I weighed(Well back then lol about 210 lbs) and it would trap 113 - 115mph all day long.

http://i752.photobucket.com/albums/xx164/mnkm94/DSCN0932.jpg

Definitely not the lowest I've seen. Nice gains, I'm looking forward to any races you get with the new mods!

My old friend pulled 430rwhp with H/C as well full bolt ons. Its about 15more then you but as stated above doesnt matter take it to the track and see what it runs. Some will say they pull 450-460rwhp with your set up and some will be lower, maybe on another day you will pull higher. If you can do 120+mph in the quarter, your car runs strong. With a Fast Intake Manifold and bigger throttle body you will gain more and be a little happier with your numbers but dont get caught up too much.

You will get more from a cam then just heads. Heads are icing on the cake.

yes it was retuned, and the dyno was from the same place

OK, you never know, so I had to ask.

Your numbers do not seem unreasonable to me; honestly, the 430HP claims from a cam and a ported throttle body seem a lot more ridiculous than the numbers you've stated. My car made 263 bone stock with 47K on it and 276 with a mild tune; you are now running 150% of that, normally aspirated, with a driveable car. Not bad at all in my opinion.

C

Smokeshow, you have some of the lowest dyno numbers I've ever seen for an LS1 car, let alone an M6. Comparing your car to the OP's is not worthwhile. Most six speed LS cars put down 290-310hp in stock form. What numbers is your Z putting down now with the H/C installed?

OP, your numbers aren't that bad. I would honestly be disappointed just like you, but it should still be a quick car! Save for that FAST intake.

A cut-out will help too.

Those big cams like to breath; fast, bigger header or cutout. It would do wonders.

On a car that made 270 at the wheels stock? 130 horses with an MS3 and headers? Man, I don't know about that.

This might be a dumb question, but you retuned with the new heads?

Are both dyno numbers from the same place? If not, forget about it; if so, as the other folks have said, dyno numbers are a pretty arbitrary thing. You aren't going to tape your dyno sheet to the windshield; does it FEEL fast? If so, why sweat the dyno sheet?

C

I have a MS3 on stock 241's with longtubes in a 6spd Gto. Stock on a dynojet I made 285, after cam, headers and tune I made 393 on a dynocom dyno which I was told reads about 20rwhp low.
So yeah you can gain 100-120rwhp from cam headers and tune. Basically I make about the same power as the op and I'm a cam only Gto lol these numbers are horrible for having AI 243's. Something has to be wrong...

You are within 5 or 10 hp of mostother cars with similar mods, it could all be in how high the guy on the dyno went with your car rpm wise or maybe could have added a little bit of timing with some race gas like lots of dyno queen guys do, i see them day in and day out at my shop, not too unusual or low, actually seeing one make 430-440 with those mods is on the less common side for a stock block... Hell my car with a decent cam, headers and exhaust only made about 380 and i have access to a dyno whenever i want it, lol... don't be too concerned, just have fun with it...

you have some of the lowest dyno numbers I've ever seen for an LS1 car

I am not overly surprised by that; when we pulled my motor out of the car to take it apart we found that the platinum was missing from half of the plugs and one of the plug wires had damned near arced through which was certainly causing some misfire. The car drove fine when I got it, but obviously had not been particularly well maintained by the previous owner(s). Even with all of that, I am sure I could've dyno shopped and pulled 290 if it was important.

I have not pulled the car on the dyno since the headwork and cam because I frankly don't have the time or the money right now for a dyno tune, but I expect to do so in the next couple of months; I'll be interested to see what the car does now that it is properly maintained. I know that it spins the 315 rear tires at 4000 in first gear with 3.42s after grannying out of the hole, so it is doing OK...

C

thanks for the comments guys. I guess spending $1200 and only gaining 30 wheel is a little disappointing. but I am putting it to the test tonight racing a c6 that has raced many other h/c cars. so we will see.

Forget the #s for now and take it to the track and see what it does.

I put down 415 rwhp with the MS3 cam only. But like they say take it to the track, dynos are for tuning and tracks are for racing. An E/T means more than rwhp to me.

But in my sig I put the gains i received from different mods.

Like others have said I wouldnt worry about the numbers too much.

yeah. I just raced a c6 that has beaten 4 h/c ls1s. only lost by about a car. so I am happy with it. check out the video in the kills section here soon.

yeah. I just raced a c6 that has beaten 4 h/c ls1s. only lost by about a car. so I am happy with it. check out the video in the kills section here soon.

Very cool !! I'd be happy with that for sure.

On a car that made 270 at the wheels stock? 130 horses with an MS3 and headers?

My car made 263 bone stock with 47K on it and 276 with a mild tune;

Bone stock auto cars usually dyno around 300 and M6s usually can hit 310 to the wheels. Lots of cam/bolt ons only cars dyno 400.....I'd be interested to see the graph on this one.

Interesting that so many cars that were rated at 300 or 310 crank horsepower SAE are making 310 to the wheels twelve years later.

I had an 350ish crank horsepower small Chevy in a pickup in high school and a shiny new 2001 Z28 M6 a few years later. Unless my truck was really making 400, The Z28 was not a 350 horsepower car, which it would have to be to put 310 to the wheels.

After reading this thread, I now have even less faith in chassis dynos than I had before I bought this car. I'll still dyno tune the car so we know it is running properly at WOT, but methinks the power numbers will be pretty arbitrary. It puts a smile on my face when I get on it; that's all that truly matters in the end!

C

Your 2001 Z28 absolutely was a 350 hp car on an engine dyno. It probably didn't feel like it because of the stupid long winded gearing they put in the M6s.

Does it run good and pull hard? That's all that matters. My old 99 Trans Am put 303 to the wheels through an unlocked converter and would go 90mph in the 1/8th with 1.5x 60's.

If I was you, I'd just tell people it's making around 400 and then go out and show them your taillights.

Interesting that so many cars that were rated at 300 or 310 crank horsepower SAE are making 310 to the wheels twelve years later.


If you poke around and do some research you will find the ls1 is a roughly 345hp engine. There is zero meaningful difference between the fbody ls1 and the Corvette ls1 other than the window sticker claiming the corvette made 340hp while the Camaro made 300/305/315. The Camaro/Firebirds were just severely underrated by GM.

dont feel bad Eric, my car only did 367 on an MS4 and TSP 2.5 5.3 heads. :jest:

dont feel bad Eric, my car only did 367 on an MS4 and TSP 2.5 5.3 heads. :jest:

haha, yeah. still have the car? whats going with it?

dont feel bad Eric, my car only did 367 on an MS4 and TSP 2.5 5.3 heads. :jest:

Yikes and the shame is that I would imagine that car ran really hard! Just goes to show that it isn't all in the dyno numbers.

Of course, big dyno numbers certainly make us all feel warm and fuzzy inside!

Go with the fast intake 92/92
Setup and tap 1 7/8 header with true duals you will hit ur goal or more

Eric, yes I still have her. Getting the 6.0 block into the machine shop this week since taxes came back. Hoping to have it on the road before summer is over.

Midnight...the car ran like shit. Took the short block to a "reputable" guy that was supposed to disassemble the stock short block, de glaze the cylinders, install new bearings and balance the crank for the new forged pistons. Come to fine out, all he did was pull the rods and pistons, put the new pistons on the rods and change the rod bearings. Didn't even pull the crank.

Well 1k miles later, the engine hammered itself to death because it was not balanced.

This time, I'm doing it myself. Do it once, Do it right.

Oh, and even with the 9 inch, slicks and launching at 6k, my best time was still only 12.4@115

Buddy of mine has a 98 ss it was a Ms3, brand new ported 243s, ls6 intake, bolts cutout, and stock bottom end with 12x,xxx miles on.it. His car only put 408 rwhp and 398 rwtq through an M6.

Bolt ons*

I saw your other thread with the race against the C6 and noticed you posted the link for the exact heads from AI you bought which are the 218cc offerings. Gaining the power you did with only work on the exhaust ports and combustion chambers is excellent! If you had gone with the fully ported 226cc 243 heads, that would have easily been another 15-20rwhp. I haven't seen this mentioned yet.

And yes, your car runs excellent! Dyno numbers aren't everthing.

Jason

I saw your other thread with the race against the C6 and noticed you posted the link for the exact heads from AI you bought which are the 218cc offerings. Gaining the power you did with only work on the exhaust ports and combustion chambers is excellent! If you had gone with the fully ported 226cc 243 heads, that would have easily been another 15-20rwhp. I haven't seen this mentioned yet.

And yes, your car runs excellent! Dyno numbers aren't everthing.

Jason

thanks man.

Time for a FAST 102

this is kinda depressing im going with pretty much the same setup and was hoping for some better numbers when its all said and done the numbers arent everything as long as i can hang with or beat my buddys 2012 mustang gt full bolt ons ill be happy