well u make more power by going lean which would explain the good numbers. but is it the kit that sets it at 13 or is it his tuning? i guess if it stays he will be ok, but it is stressing out the engine. 13 a/f with 18psi on that is a lot of pressure for that engine, especially if he plans on using nitrus.

what happens when the temp drops and it naturally runs even leaner. i have a fully built NA motor and 12.8 is as lean as i will get. just expressing my concern, great numbers, but be careful.

 

First bdwarr6 congratulations for the tune ! Rob I seriously think that we can use a map clamp to set the MAP2 sensor max voltage lower than the WOT voltage, to get more timing advance.

(To be only used on the MAP sensor AFTER the blower, since we cannot mess up with the MAP sensore before the blower, because it will immediatly throw some codes). Just read the service manual set, the MAP2 sensor is used to scale all the air/fuel/timing model.

About the MAF translator setting at mid RPM's, did you scale the MAF more or less ? Mine seems to be not easy to tune ...

 

267 whp with or without the cat ?

 

Our first pull in in 3rd gear was WITHIN 2HP!!!!!!!!!! of his 4th gear pull.


Again, why put more stress on the car and dyno in overdrive.

 

indeed

and have you guys come up with connectors for the injectors or the maf-t?

do you know what settings his maf-t was at??

 

I know it was 3rd because he redlined at approx 99 MPH.

If you guys claim there is no difference between 3rd and 4th then why don't you run the car in 4th gear then? It is the closest to 1:1 so why cheat yourself by getting false numbers? Even if it is only a couple HP.

 

It is the closest by like 0.07....big deal. Don't quote the GM website cause as i have been shown it is WRONG. If you want to get **** why don't you do like i have suggested before and do a 3rd and 4th and use the weighted avg....but or a 0.07 dif in distance from 1:1 what is the point...

 

read this post then please stop talking about it. it does not matter what gear you dyno in (with reference to 3rd and 4th). either gear will read above or below the other.

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/12-17-2005-dyno-numbers-stock-3rd-4th-gear-comparison-9766/

 

this kit keeps geting better and better!!!!!!! i plan on buying the parts except for the pully and geting a 2.7 from doug at billet flow.

have you guys sorced a connecter or do you still have to splice and soder wires???

 

My point is that there is a right way and a wrong way. Everyone knows that the 4th gear pull is the MOST accurate, so why waste time doing them in 3rd? It makes no sense

 

and my (and everyone else's) point is that it does not matter. niether gear is more accurate than the other. the difference between 3rd and 4th with reference to 1:1 (.07) is not big enough to make a difference in numbers or accuracy....

 

damnit thats some good numbers from such a low cost kit .......... hm this gm kit better hurry the f%$# up so someone can be the test subject ... im startin to waver on my descision

 

same here, if the GM kit isnt ready by the time the funds are available, this kit will be it for meeeee

 

I believe there is a boost/timing issue that causes the jump in HP between 3rd and 4th. If you look at my dyno it's almost spot on the same the entire rev range and at the very end of the rev range in 4th it knocks down a bit and there really where you lose the 10 HP.

 

Sweet numbers!!!
Thinking about geting that same kit myself now.

 

i have no cat

 

I'm actually kind of disappointed, I was hoping for higher numbers for you then that.

 

i think something might be wrong with their dyno, because every dyno should cross hp and tq at 5500RPMs this one is alittle off maybe thats why its a dip.

 

I was hoping for higher numbers to, but there is a differance in the 05 to 06 pcm, if I was an 06 i would be around 280ish I would have to estimate. Remeber I have a CAI Rob when he hit his 270 did not have anything but the stock airbox

 

Don't forget the exhaust ports are so small (especially true when you're making more than 270 BHP) that any muffler or cat or piping would not make big HP gains ! But you can just remove your stock restrictive 2,25" muffler and you could gain 8-10 whp ! Any knock retard recorded or some hearable pinging noise ?

 

Hey congrats! Thats awesome that you have the first Cobalt to hit 267whp!

 

no its 5250

 

This crap of 3rd gear vs 4th gear is getting pathetic!! LISTEN REAL CLOSE AND CLEAR!!

We have proven they are within 2-3hp, NOW

Why would we subject our cars to longer abuse than necessary to accomplish our measurements!?? 3rd gear pulls are over faster and less stress do to heat build-up from lack of airflow accross the radiator and heat exchangers. We do the same thing in the w-bodies. I dyno'd my Impala in 2nd because it was over by 95mph. If i were to do it in 3rd, that would be TWICE as long and 151 MPH!!!!!!!!!!!!! I tried both, with-in 5hp!

Does it make sense yet??? In theory, 4th gear should be higher but do to our lower torque, it is to much stress on the drivetrain.

Once i get my hands on some tuning software LOOK OUT!! There is some major changes needed to wake this up and i'm waiting to tap into them!

 

Nice times Bdwarr6 .

No come on Rob , crack that PCM biotch

 

Rob knows his shti thats all im saying, I trust my car to him totaly