I was searching through the forums look for an answer and i was not able to find one.

I heard that at 283hp the rods snap on the 2.2L. here is my question. Is that wheel horse power or crank horse power?

 

pretty sure it's crank horsepower, but I'm pretty sure the pistons go before the rods, just FYI

If you are planning on making anywhere near that power, I would upgrade, but thats just me, if you max out the stock internals you have no room to grow

 

I think it was more like 250, and I have a feeling that its a the crank. GM tested it with a big shot of nitrous, so I'm assuming it was on an engine dyno.

Of course, people like Mkulrey are past that with turbo's, so who knows where the limit is with a well tuned setup.

 

its a little late for that i dyno'd at 242whp today

 

Boom? lol. Good luck on longivity bro.

 

I wouldnt push it any more then that. Just have him run you a bit rich, right around 11:1 and you should be good for awhile.

Hows the spool times?

 

lets say that i dont have to worry about traction problems since the spoll is slower then a small turbo (im running a t60-1 hifi w/ ceramic ball bearings, 786 cfm) and i am an automatic cobalt, keep that in mind.



im not the only one over 240whp, mrkurley is one as well. im not so sure its the HP lvl that is breaking the engine, its the high trq and hp that is breaking it... and since im only at 195 trq i think im pretty safe.

 

Normally it is the boost and the timing that key in on making things go boom.

 

yeah, vince was explaining that to me. here is what he had to explain to me this time

vince's words "Torque is the measure of the force applied to the pistons, rods, crankshaft,
and the rest of the drivetrain. So, yes, it's what's going to break things.
So, to say 250 WHP is the breaking point might not be an entirely accurate
way to describe it. Horsepower is a measure of torque multiplied by RPM.

If the rods failed because of the sheer energy transferred to them, then
it’s the torque number that really matters.

If the rods failed because of the speed at which they were traveling
combined with what would be a lesser amount of energy transferred to them,
then it's the horsepower number that matters.

To know how much any of this matters, we'd need to know more about the
failures experienced."

 

And that is all correct. Imaginary highfive to vince. lol.

 

Good dyno numbers
Do you have a full 3" exhaust?
I have been told by GM ecotec builders that 250 WHP is what the 2.2 can handle safely.

 

Rods are supposed to snap before the pistons go. 250 is the magic number gm likes to throw around.

I'm sure they can take a little more, but I wouldn't push what you have right now. One big spike and boom.

 

good then i should be good to go for tomorrow's dyno'd

after the fixed tune i got from vince tonight i'm pretty sure my dyno tomorrow will yield 246-248whp

but how did GM get that? was it by just stright nitrous? if so... nitrous yields A LOT of trq so that would contribute to the snaping of rod's

oh, and no i dont have full 3 inch exhaust because my turbo is where my muffler should be i need the stock size to keep the turbo spooling fairly quick. if i use the 3 inch ill loose velocity by the time the exhaust gets back to the turbo at the rear of the car

and yes i did say the rear of the car... a lot of people (haters) tryed saying i wouldn't get much more then 212 hp at the wheels and well... i proved those peeps wrong on that one

 

That setup is pretty interesting, but it just seems like a long distance for the air to travel.

But, I mean, If it works then that's great.

 

gm hit their 283 boom on a 125-150 shot of nitrous straight shot.. a slow spooling turbo will be alot easier then a sudden addition of 125 hp ...
i'd be carefull pushing much over that though..

 

Hmm your numbers are 242whp and 195wtq
Mkulrey13's is 241whp and 254wtq

Big diff in ft-lbs and a rear mount is excess weight and has more piping to leak/ get damaged and whatnot. They sound cool though..Did you ever post vids?

 

sure did post vids. im not worried about the trq because i dont have traction problems w/ the lower trq and i pull 2 cars on ss/sc's from a dig and then dont gain or loose anymore ground... but from a roll its a different story, ceasars ss/sc stage 3 pulled half a car on me from a 40 roll and then at around 115-120mph he started to walk away slowly (stupid automatic)

vince told me that my trq converter on my automatic is limiting me from putting down more then 195 wtrq


i dont think there will be much leaking, there are only 6 couplers, 2 on the inter cooler, 2 on the intake in the engine compartment and 2 back by the turbo, everything else is welded.

exactly my point. a shop out here put a 75 shot on an LS and it dyno'd at 299 wtrq so i can imagine what a 125 shot whould yield

 

Looking at the graph and being auto ^ doesn't seem right.

Anyways link to the vids, I want to hear it.

So, it made well over 200wtq without the nitrous?

 

what doesnt seem right? the 242 whp?

http://www.youtube.com/watch?v=e1W6l...eature=related

http://www.youtube.com/watch?v=7bEjaKJcDKE

what are you talking about? i dont have nitrous on my car anymore. i was talking about a buddies cobalt. he has a 75 shot on his and he dyno'd at 299 wtrq and 207 whp w/ his n2o kit

 

1. The races.
2.I know, but that equal out to ~130whp and over 200wtq before the nitrous. That doesn't add up.

 

1. you mean by how they are not so spiky and drop off while shifting? vince tuned my trany and rased the limiter to 7k rpms and changed the shift points to not shift till just short of 7k and after the shift the rpms dont drop below 5200rpms and while shifting the boost never drops below 8.9psi at any point since i dont have to let off the gas to shift. on the auto trany if you drop it to 1st it turns off the traction controll and will only shift to 2nd. then it bounces off the rev limitor. Same thing if you bump it up to 2nd it will only shift into 3rd and wont go into final drive. (i also have b&m shift plus that makes for harder shifts/ instant shifts) if you listen carefully in my dyno vid from the rear you can hear my car chirp on the 1 to 2 shift.

2. no, 75 shot nitrous doesnt mean 75 hp and 75 trq. nitrous yields a shiz ton of trq. at least from what ive seen on everyones dyno out here

i forgot to mention the pitting at the end of the dyno... thats from lack of timing uptop (time was too retarded and was making my header white hot just from one dyno pull)... vince fixed that today and we will see how the dyno goes tomorrow when i go out for another run on the dyno.

i loaded up the updated tune and did a data log, he added 5 degrees of timing uptop and we got slight Kr and saw the AFR jump up to 12.8 so we added more fuel and the Kr went away and the AFR dropped back down to 11.7 so, i feel good about tomorrows dyno

 

Unless he is decently modded and he is not as you can tell by the HP #'s on nitrous I don't see 299ft-lbs happening.

 

there is another guy that did the same thing out in cali, he got his ls on a show, if i can find the vid again ill show you that one, he yielded 299 as well.

 

207whp 299ft-lbs??

 

i couldnt find the vid i was talking about but i found one that was almost as good. 192hp and 264trq

http://videos.streetfire.net/video/p...n-tv_93881.htm