EvilleCobalt

Well I just got home from school after strapping the balt to the dyno. My numbers were a little disappointing:

1st run - 127.9 HP @ 5944rpm
124.1 TQ @ 4287rpm

2nd run - 127.6 HP @ 5918rpm
128.2 TQ @ 3112rpm

I know I have seen other L61 guys put down these same numbers stock!? Granted this was a Mustang dyno so the numbers are lower and more real world accurate compared to a Dynojet dyno. With my old Z24 cavalier with intake I put down 132 Hp and 137 TQ on a Dynojet and it was an auto. My current mods for cobalt in sig. So should I be dissapointed or what?

KillerBee

You probably have not gotten any tune huh so i would be happy if i was you

EvilleCobalt

No considering we can't really tune yet and I probably wouldn't put the money in to tune if I could.

chevyLSchik

he cant get a tune yet....lol

<----Beta Auto Tune Tester....we shall know this weekend if our cars can/will be tuned

INDColtsFan18

those do seem rather low. I've seen stock 2.2L's put out very close to that, as you said.

slowboyy06

08 cobalt ss april 7

EvilleCobalt

Yeah definatly sucks because the car pulls much harder than when it was stock. Does anyone have any numbers for 2.2L on a MUSTANG Dyno? I'm pretty sure most have been on Dynojets. Mustang dynos do read lower; the other day we had a brand spanking new Shelby GT500 mustang on the dyno and it only put down 371 Hp and they are rated at 500Hp to the crank if I'm not mistaken or somewhere close.

What?

chevyLSchik

yea, we use the Dynojets here....i might be able to get a dyno on friday/saturday and we'll see what i get stock! not sure if i'll be on the dyno though...i know i am going to the track on sunday though

blu3_v1p3r

iTrader: (6)

127.9 seems pretty low, it feels like our cars have more then that...

jperris

I'm guessing that your car would have made more torque and probably about the same hp if it were completely stock.

The header and the intake are killing your low-to-midrange torque and they aren't helping you in the top end either because of your stock head and cams. You can't look at individual bolt-on components as a way of building power. The whole induction and exhaust system should match the cam and head flow characteristics. The intake mani and header are reducing the velocity of the airflow at lower revs and then when you get to higher revs, the stock cams keep you from flowing a large volume of air, which is what you need to make power (along with fuel, of course). Unfortunately, intake cams aren't available for '07-up L61s, hence the reason I still have the stock intake and exhaust manifolds on my car.

Jn2

iTrader: (1)

i made 127.5, 139.2 on a dynojet, mods were cai, ttr tranny mounts, lsj ex. manifold and dp, i will be going back to dyno again sometime early april since i have gotten a new headerinstalled, i will have the dp from exhaust depot, i added a ignall trq damper, and a megan exhaust, my runs were in 4rth gear

FASTL61

i.......dont really care about hp at wheels.i guess some people care about it more than others but i just do mods then take it to the track for times...like this last friday i went and ran a 15.6 @ 88 mph.all i have is intake and exhaust with a drop!thats just me though.

blu3_v1p3r

iTrader: (6)

I'd like to see the stock dyno number... wonder how much differnt they are then yours...

FASTL61

i dunno i dont really care about what my hp and torque is...dont get me wrong i know there important but i like running for times.i guess it would be more important if i was tuning the computer for boost but until then i dont care to know how much power it is at the wheels as long as i run good in quarter then im happy.but when boost comes you bet ill hit a dyno to get it properly tuned!

EvilleCobalt

15.6 is definatly a good number. I ran a 15.8 in my auto cavy and the balt is a bit quicker hopefully I can at least beat my cavalier's time since I couldn't with the horespower numbers. I'm fairly certain it is because of the type of dyno, plus you can't really compare two of the same dynos anyway even if they were both dynojets or mustang dynos. Too many variables that's why they say to stick to the same dyno everytime. Oh well

Ok edit here, I was talking to my instuctor along with a bit of research on the side about the differences between a dynojet and mustang dyno. They all see a difference of about 12-15% between the two with the mustang dyno reading lower because of the different vaiables involved to give you a more real world reading. One example I saw was a camaro SS that put down 310 rwhp on the dynojet, right after he pulled it on a mustang dyno and put down 245rwhp. So if all is right I should be about 145hp to the wheels on a dynojet which is much closer to others who have dynoed. Yeah I know some ricer math here but w/e it makes me feel better lol.

s1lver

my cavy L61 put down 147 whp on wai and motor mounts.

Bumblebalt

...uhh what???

jperris

dyno numbers can't really be used for an accurate comparison between your car and another, especially on different dynos, even if they are the same type of dyno, the operator can always input correction factors and that will change the output numbers. what a dyno is really useful for is measuring the effect of changes on an individual car. if you didn't do a baseline run on the same dyno with your car when it was stock, then your current results aren't useful at all, unless you plan to do further mods and use your current setup as a baseline from which to compare the effect of the future mods.

bottom line, don't worry about what other cars are putting down on other dynos, just keep track of the effect of the changes you make and use that to evaluate what is helping and what isn't helping.

also, don't be concerned with peak hp numbers; much more important is the shape of your torque curve. if it's a car that's mostly driven on the street, don't sacrifice all your midrange torque to gain a little top end power. torque is what gets you off the line quickly. Remember what Carroll Shelby once said: "Horsepower sells cars; torque wins races."

lsjwannabe

iTrader: (1)

numbers are just that numbers

XM15

I put down 140 whp/143wtq on a Superflow which from what I understand reads ~15% lower than a Dynojet.

EvilleCobalt

Yeah I know, I wish I had a baseline number. They just asked if anyone wanted to dyno their car and I said hell yeah! The torque curve was surprisingly smoother than I expected, no peaks or valleys so I was happy with that. And yes I know all about the different factors the operator can put in to effect the horsepower/torque readings. I just started this thread to rant because they were lower than expected untill I did the research and I'm right where I thought I would be. He said we can strap it down again at the end of the semester and actually use the fan to draw some air in. We seemed to have forgotten it at the time and my temps stayed about 200-210 when they are usually about 187-190 so maybe I can squeeze a little bit more out of the car.

It's all about the dyno but those are some good numbers.