Dyno in 3rd gear. There is no reason to take the car to 140mph in 4th gear, when the differences in power between 3rd and 4th are usually very small. When I dyno'd my car stock, the difference between 3rd and 4th was 2 ft lbs of torque, that's it! A 4th gear pull puts much more strain on the motor, and takes alot longer, making the motor and IC coolant much higher. Take my word for it, do a 3rd gear pull, take it to 7K rpms, and see what your results are then.

 

That's what i did when I dyno'd. I did 3rd gear pulls. I tried one 4th gear pull and my temps were through the roof.

 

dam dude that suck here my dyno run 05 ss/sc stock

 

Run shell V-power, get a 2.8 inch pulley 100.00 bucks from pulley boys, and get 1 step colder plugs gap them to .40 you should see some better gains

 

already get shell or sunoco 94, i will do exactly that i will get the pulley, Does it works fine with the stage 2 gm kit? I dont need a belt or anything? Also since i got the bolt on pulley setup now, is it a quick swap to the 2.8 or does the blower still come off? Whats the plug number for the ngk's? Thanks in advance

I will also make sure i do the pull in 3rg and pull it all the way to 7k. I cant believe these cars need to goto rev limit to make full power, thats pretty lame but i guess thats how these little motors work.

 

plugs: NGK Spark Plugs (BKR7e) I bought that at Hudson NAPA but I think they were the last ones.. http://cobalt-addiction.com/performance.htm has them also tho

where do you get Sunoco 94 btw

 

2.8 goes on in 5 mins flat!

and the bkr7's are the one step colder plug from NGK

 

awesome, thanks. I will report back when its on. Thanks god, taking the blower off sucks. I wasnt sure if there was enough room in there to just unbolt and rebolt the new one. 2.8 is gonna give me like 17-18psi i take it. Thats about as far as i want to take it with this car, the clutch is spongy enough lol. Plus its my winter beater

 

oh ok, i already got some of those, i fogot all about em. Ya hudson napa has all the good plugs, they got my tr8's for the camaro too and no on ever carries em

 

On the dyno days its 65 for 3 pulls. I dont think there will be anymore until spring but if there is I will pm you. IF i dont go just use my name so they let you jump in on a camaro/firebird day

 

Was that 3rd gear or 4th ?

FYI. Rule of thumb is to use the 1:1 ratio or the closest to that . Using third will not give you an accurate reading .

We have had stock 2.0s/c's put down any where from 197 hp and 192 tq to 214hp and 199 This is on a Dyno jet 224 .

 

The 3rd gear ratio is 1.18:1 and the 4th is .89:1. A third gear pull will give you a higher reading, but a 4th gear pull will give a lower reading. We have nothing close to the 1:1. I would say dyno in third gear as I had issues running the car to 140+mph on the dyno. Yes, 4th would be closer, but it'll also show lower than it should be, and strain the car a lot more. This is just my opinion though.

 

werd, since theres nothing close to 1:1 3rd gear i think would be better. Of course lil bit inflated numbers is not accurate but still coo.

 

2-3 extra hp never hurt the ol' confidence/bragging rights!

 

yea when I went to get my car dynod they recommended 4th gear for accuracy and it was even higher numbers than 3rd for some.. I put down about 214whp 209 wtq on the mustang dyno in forth gear with just an Injen CAI at the time and the wrong spark plugs... Now I am trying to find someone with hp tuners so I can tune my CAI correctly with my Stage 2.. I notice hiccups when on wot after I got stage 2 the other day

 

definetly retry, I dynoed more then that with just a CTI header and downpipe.

 

No offense man but that dyno is way off...mustang dynos are way lower then a dynojet, for you to put out those on that dyno, its suspect. Either you have the highest HP factory freak ever, or they had the dynos settings jacked up for false numbers. Even though my hp was low, my tq is right on with many other people with my mods. For you to do that basically sotck...just isnt happening. I know if i pulled to 7k it would have gone 235-240hp but the tq at 209 is correct as is. I woudlnt dyno your car at dez, they have the dA setup correct and you wont like the numbers you put down. You will be lucky to see 225-230hp and 209 tq again even at stage 2. I have stage 2...injen cai and gmpp catback, you had nothing but a cai and your putting out near my power? I wanna dyno were you did Dont take this personal, just letting you know you wont like going to an accurate dyno. Also i got the gm flash with the injen and stage 2 with no hiccups...i dont think hp tuners will help. Something else is up. Check your flash code level. Also if you want to retune it, wait a little bit, im getting efi live that i use on my camaro setup for my cobalt. Trust me

On a side note, i just picked up a 2.8 pulley and ngk plugs for the weekend

 

get er done!

youll notcie a big tq increase with the 2.8! and hp should climb another 10whp or so also

also reset your battery after install and drive it for atleast 50 miles at varible speeds (including WOT) to get the car used to it, before you dyno again! these new cars are so strange...

GL my friend

AND if you still want more power HP tuners could probably pull you a few more ponies increase timing and adjust air fuel ratios to a perfect tune and watch those #'s increase

Im gonna go this route sooner or later, after i get my front mount heat exchanger thoe

 

purevl - There is a guy in my town the uses EFI live. His website is LS1powertuning.com I've good things about it, and I was just wondering what your input was. The guys said he was going to be receiving the latest updates soon and would be able to tune my car with it as well.

 

I think your dyno numbers are ok. People who dyno stock at 220HP are done on a bad dyno.

Here's a Stage 2 with a 2.79" pulley

http://www.damachining.ca/S2%202.8%20HP%20edit.jpg

 

my camaro with efi live is awesome, its 2 bar speed denisty and it is tuned off the wide band. I can turn the boost up or down from 8psi to 15 and the tune self adjusts. It makes 880rwhp at 15psi on pump gas and still gets 22-24mpg on the highway. We have used ls1 edit, hp tuners, etc, efi live is far ahead of these. Its uses custom operating systems, it doesnt use stock code. It rewrites it all. When i get it on the cobalt i will let you know how it goes

 

thank you, i figured as much. Im sure i may have hit 230ish with a 7k rev, so i may hit 240 with the 2.8 i just bought but no more, im optimistic but i know alot of these dynos are way off. Its easy to make fake power just by playing with the weather settings and altitude on the dyno.

 

I don't think you can make any claims about how stage 2 did unless you have a baseline.
As a car guy with a bad ass Camaro, and a "bunch" of dyno experience, you should know that eh?
And how did it feel on the street?
Any different?
I realize that your butt dyno has a different calibration than 99.9% of the kids here, but I would have thought you would have noticed something. Personally, I think the SS/SC is slow.....and I own one.

Someone asked what were the weather conditions?
The dyno compensates for the weather conditions and gives corrected data. Unless the dyno operator forgets to enter the data, or doesn't have the data to enter.
I have only been on an engine dyno, but I would assume that a good chassis dyno measures the air density, temp, baromoter and humidity automatically and comes up with the correction.

Did you ever read about the Dyno Jet? The inventor couldn't make it read right, so he added his own fudge factor to get the numbers to come out. Do a little research. I believe it was either Hot Rod or Car Craft who did a nice article on it.

In other words, these things spit out numbers. May or may not be absolute. But are certainly good at measuring change. Provided the operator knows what he is doing.

Me thinks folks get too caught up in numbers at the front wheels.

R

 

umm i dont have to know what they baseline when there are a couple hundred dynos on here giving me an idea, obviously most of you like to post false inflated numbers but a few of the good vets on here pm'd me real numbers. Dont be a sarastic jerk about it. I know on average 20rwhp and 15tq is about right with the stage two. I dont need exacts for my pos winter beater car. I didnt mod this to be fast, i modded it so it would get out of its own before i fall asleep.

I run the dynojet myself when i dyno my cars. You can easily add in any weather you want and even play with the da and i can make my cobalt 30hp more then everyone elses if i feel like it. Unfortuantely i like real numbers, my post was more sarcasm about all the cars here putting down 220 bone stock but yet i can barely do it with a stage 2 modded car.

As for the butt dyno...this thing was completly different on the street, car woke right up. But when gm themselves claim its a 60hp kit...i like to get what i paid for.

THe day i dynoed this car i just got done dynoing 20 camaros and gtos...you have never been on a chassis dyno and your giving me advice about one? Thanks

 

The GM Stage 2 kit is only rated for 241hp at the flywheel. 205-241 is only 36hp not 60 like you stated. Just trying to make sure you have the correct info, not trying to start a fight here, as I'm sure you competent about cars with the other animal you own!