First i would like to say i am in no way intending this to be negative i am just stating some facts that i think everyone should know before they do something stupid to there car. When you look at what they have done it is pretty impressive 280whp at 5800 rpms and only 20* change in iat2 temps seems good but what we don't know is how fast that blower is going to spin so i have taken the trouble of showing you how fast you will spin the blower with all the different size pullies assuming you run a 7k redline.

2.9 ( the one they dyno'd with) 15,086 rpms

2.8 15,625 rpms

2.7 16,203 rpms

2.6 16,826 rpms

2.5 17,500 rpms (i believe they said that is the smallest they would run)

This blower is rated by lysholm at 14,000 continuous rpms and 15,000 max so it is already at its peak on the 2.9. With the increased rpm's comes more heat so i bet you would have seen a little more change in temp if they would have ran it to 7k nothing huge though.
Also when you are running a twinscrew above its rated rpms the blower is likely to sieze because of the tight clearence between the rotors.








In the end it is up to you i just would not want to ruin a perfectly good blower running it to hard

 

I would have to agree...great post.
I am sure more hp is available if the motor is built and the tuning is tweaked more.

 

thats good to know... but with that said.. if u did a meth injection kit that would help resolve the problem with heat correct

 

good post, good to know how much RPM's they are at with different sized pullies

 

yes heat is not the main concern though i just would not want to push that blower to hard with the rotors so much closer together if you spin it to hard you are fuct out of 3k so if you have it to drop go ahead lol

 

Yea, its good info but I have to say I already knew this. Its not that hard to figure out. From what I understand is they can still get 280whp from a larger pulley with more tunning. Now, keep in mind with exhaust, intake, downpipe, and a tune should put it at over 300whp safely. That is impressive IMO. That is at least 40+ more hp then the M62 with a 2.8 pulley. Not only that but the twin screw would be safer and running at lower temps. With that said, throw some water/meth, and a 2.8 pulley with H/E and you could bet with tunning safely could hit around 350whp. Now I also am willing to wait to see what other options for a blower swap. Only time will tell...

 

You won't see 50whp from meth sorry not happening. The car is running a intake already, and it will maybe pick up 15 from the exhaust.

A h/e will do nothing but make it less prone to heat soak

 

hell, they got more from the twincharge rl...
bet the turbo beats it as well

also, the rpm's are the killer....that would be the undoing for the ts.

 

Do we for sure know if the 15,000 rpm max is only a safe figure? Or if it really is something to take seriously?

The way I see it, after looking at the dyno, at around 7000 the TS should be around 300 - it made 281 over 1000rpms below redline. If we could run something a little smaller than the 2.9" but still be safe, such as anything between say 2.75" - 2.9" with full boltons and a spot on tune with meth, I think we might actually have a reason for the TS.

Obviously a turbo will be better but for those out there who want to keep the cobalt supercharged, it is steep but I don't think it's completely useless.

 

lsjwannabe made a good point. the supercharger is just like our engines. our engines cant really handle over 7k so why over spin it and take the risk of blowing it up. what he is saying with the twin screw is that, the 2.9 is already overspinning. forget about heat and everything else. if your overspinning, its just goin to be a matter of time before you screw it up and waste 3k. now running the 2.9 with a 6500 redline will obviously be alot better for the twin screw but think about this, its maxed out. now with a turbo conversion, its safer and more efficent with heat. if anybody is going to spend 3k, spend a little extra money and buy the turbo kit. you will make way more power with the turbo then the supercharger and it will also be more efficient.

 

Turbo ftw, good informative post

 

You could build a custom turbo kit for 3k+-, make more power, be more efficient and always have the ability to make more power with a bigger turbo.

 

Tvs Ftw

 

So you assume that the stock cranck pulley is 6,25" right ? But did someone get it precisly measured ?

 

those pictures are from lysholm directly i don't think they would lie.

 

I said exhaust, downpipe, intake, H/E, meth, and tunning. Timing would play a big part in the tune.

 

yes that is the measurement i used it would not make to much of a difference either way but the point is it is overspinning the blower

I love how everyone here thinks timing gives you some ultra hp. They are running 17* they won't pick up much power from cooling because it is already there. With meth sure they can run 25* but do the stand to gain much maybe 8hp. Also the car already has a intake, its running the gm header ( not that it matters)

 

well its still allowing you to go a bit further than what the stock M62 does by about 50whp and thats an improvement, not everyone wants a turbo reguardless of the gains

Though Im sure that the Hahn kit will blow the twin screw out of the water on power for only a few hundred more. I think the Hahn kit is really going to bring out the full potential of this engine.

 

50whp how so? we have had members that put down 295whp on meth, and so far i only saw 281whp due to tuning issues.

 

so pretty much what your saying is it would be a waste to swap

 

nope if your stock its a pretty good mod becuase you get 280+whp for 3k, being highly modded like myself it would be a waste to gain 20 to 30whp for 3k more.

 

Ok here's my take on this subject. Taking into consideration all the broken drivetrain parts that my car has seen and all the other parts to top that, I don't think I like the idea of having more than 350-400whp. At that rate what the hell good does 400+whp on a street car with FWD do anyone? Sure it's great to burn tires up with, but that's about it. I think this blower is going to get me close the the 350whp that I want RELIABLY, which in my mind is borderline for what I personally want on my own FWD car. Sure you can put drag radials and slicks on for more traction, but at the rate I'm grenading 3rd gears at, tirespin is a lifesaver to me.

I will let you guys know what my full view on the kit is when it's installed and running on my car soon enough however. Then you can judge for yourselves with real numbers and such.

 

I just don't see 350whp realiably, i can see it but i don't know how hard you would have to push that blower or how long it will last.

 

exactly .. how is it going to be reliable when you're already spinning it at max blower RPMS at 280 WHP on a 2.9? i think like 325 WHP at most and even thats pushing it before something blows...

 

Well it was 281 at 5800 rpms so with more tuning i could see it going 290whp on the 2.9 and with exhaust i could see 310whp you could throw meth on there to but a 2.9 is as small as i would go it's to risky trying to make big numbers and blowing something that expensive.