315 BHP GMPP 2.0 Ecotec Engine ...
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315 BHP GMPP 2.0 Ecotec Engine ...
For those who reads the article (4 PDF sections available also on a CD) from GMPP, they explained how to build a 2.0 LSJ Ecotec up to 315 BHP (engine crankshaft power) and 250 engine TQ. These numbers are shown in the 4th section.
Part #1: http://www.gmperformancedivision.com.../23/ecotec.pdf
Part #2: http://www.gmperformancedivision.com...tec_Part_2.pdf
Part #3: http://www.gmperformancedivision.com...tec_Part_3.pdf
Part #4 : http://www.gmperformancedivision.com...tec_Part_4.pdf
We all know GM underated the stock LSJ power (205 BHP) from the factory, since the Cobalt SS seems to dyno an average of 210 WHP (4th gear on a dyno jet). 210 WHP equals to 245 BHP (engine power).
Here are the parts used to achieve the increase in performance. Numbers in parenthesis are estimated to get the 245 stock BHP to the 315 modded BHP. I think they use a midly modded "conservative" setup ...
1 : Forged aluminium pistons
2 : More agressive Comp Cams camshafts (15 BHP) and higher spring rate valve springs
3 : Replaced balance shafts (5 BHP)
4 : Bigger injectors 44 lb/hr
5 : New calibration and controller (15 BHP)
6 : Shorty header and opened exhaust (15 BHP)
7 : Air filter seems a Donaldson like the stock one
8 : 3 pass coolant intake manifold (minmal gains according to the article)
9 : Stock supercharger WITH a 73 mm (2.87") pulley @ 16 PSI (15 BHP)
10 : CNC ported cylinder head (only 5 BHP gained at the 315 BHP level since the stock head has been said to cause no loss up to 275 BHP).
One thing isn't sure : Did they underated the 315 BHP result ???
Part #1: http://www.gmperformancedivision.com.../23/ecotec.pdf
Part #2: http://www.gmperformancedivision.com...tec_Part_2.pdf
Part #3: http://www.gmperformancedivision.com...tec_Part_3.pdf
Part #4 : http://www.gmperformancedivision.com...tec_Part_4.pdf
We all know GM underated the stock LSJ power (205 BHP) from the factory, since the Cobalt SS seems to dyno an average of 210 WHP (4th gear on a dyno jet). 210 WHP equals to 245 BHP (engine power).
Here are the parts used to achieve the increase in performance. Numbers in parenthesis are estimated to get the 245 stock BHP to the 315 modded BHP. I think they use a midly modded "conservative" setup ...
1 : Forged aluminium pistons
2 : More agressive Comp Cams camshafts (15 BHP) and higher spring rate valve springs
3 : Replaced balance shafts (5 BHP)
4 : Bigger injectors 44 lb/hr
5 : New calibration and controller (15 BHP)
6 : Shorty header and opened exhaust (15 BHP)
7 : Air filter seems a Donaldson like the stock one
8 : 3 pass coolant intake manifold (minmal gains according to the article)
9 : Stock supercharger WITH a 73 mm (2.87") pulley @ 16 PSI (15 BHP)
10 : CNC ported cylinder head (only 5 BHP gained at the 315 BHP level since the stock head has been said to cause no loss up to 275 BHP).
One thing isn't sure : Did they underated the 315 BHP result ???
Last edited by Jmc007; 05-07-2006 at 02:26 PM.
#4
Originally Posted by codyss
Isn't rasing the boost 4lbs going to yield more than 15hp?
1lb = 10whp for our displacement.
It's more like 40whp. To be more conservative would be between 25-40whp for all the haters.
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the article actually says that they made "real power gains" going from single pass to double pass so u wrong there. while the 1psi=10hp equation is a good guideline, there is nothing scientific about it and it doesnt work like that on all engines.
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and also im pretty sure there would be more than a 5hp gain with a pnp head just because its not a restriction up to 300 hp, there is always room for more flow. granted u can overport (?) a head and actually lose power but i dont think gm would have done that
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Originally Posted by redd214
kinda old cheif but thanx for the effort
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If you break it down 1psi equates to about 8.6hp on our cars.
red - he was saying that going from a 2 pass to 3 pass leaves minimal power gains not going from 1pass to 2 pass which obviously gives lower intake air temps.
red - he was saying that going from a 2 pass to 3 pass leaves minimal power gains not going from 1pass to 2 pass which obviously gives lower intake air temps.
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Trying to be honest, the main purpose I post this is to get the people realize that (as an example) just replacing a muffler or installing a cold air intake won't give you 300 TRUE WHEEL horsepower, since the engine is only a 2.0 liters, and since ALL the bolt-ons gives GMPP a result of "only" 315 BHP (engine brake horsepower) thus resulting in 270 WHP.
Also, what is not good for the Cobalt SS owners reputation, is all the kidders who claims that their cars makes 250 WHP bone stock, but drive their car to a 14.8 or 15 second quarter mile. Ok I tried to help, period.
Also, what is not good for the Cobalt SS owners reputation, is all the kidders who claims that their cars makes 250 WHP bone stock, but drive their car to a 14.8 or 15 second quarter mile. Ok I tried to help, period.
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Originally Posted by sneaky
Every pound of boost
1lb = 10whp for our displacement.
It's more like 40whp. To be more conservative would be between 25-40whp for all the haters.
1lb = 10whp for our displacement.
It's more like 40whp. To be more conservative would be between 25-40whp for all the haters.
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Here is a copy of the fourth part. http://www.megaupload.com/?d=FL38QU4V It is a shitty host though, and **** may pop up so I wouldn't view it at work. I didn't have anywhere to host it though.
I can email it to someone if they want to host it.
I can email it to someone if they want to host it.
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Originally Posted by Jmc007
Also, what is not good for the Cobalt SS owners reputation, is all the kidders who claims that their cars makes 250 WHP bone stock, but drive their car to a 14.8 or 15 second quarter mile. Ok I tried to help, period.
#14
Originally Posted by Drewfu$
6 : Shorty header
Not to beat a dead horse, but I think GM knows what their doing with this motor. And they think a shorty style header is best. Ok I'm done....
Not to beat a dead horse, but I think GM knows what their doing with this motor. And they think a shorty style header is best. Ok I'm done....
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Originally Posted by Darksun280
Well one its never been broken down and put into one post like this before so relax and kick your feet back you may actually learn something by the time this is done. And by Sneaky's rule anyone running the 3.0 pully should be at just about 250 whp with just throwing on a smaller pulley and thats it, when thats hardly the case.
#17
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Originally Posted by redd214
the article actually says that they made "real power gains" going from single pass to double pass so u wrong there. while the 1psi=10hp equation is a good guideline, there is nothing scientific about it and it doesnt work like that on all engines.
I keep wimping out but I would love to see someone take off there intercooler and figure out how this modification is done.. I think it would net some good gains... especially with a pulley.
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Originally Posted by kelleyperformance
man i def know thats for sure. i got a CAI, magnaflow, and a 3" pulley and on a dynojet im only pulling like 239 whp! also the 90 deg weather kinda hurts lol
#19
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Originally Posted by AlphaJaguar5
If you break it down 1psi equates to about 8.6hp on our cars.
red - he was saying that going from a 2 pass to 3 pass leaves minimal power gains not going from 1pass to 2 pass which obviously gives lower intake air temps.
red - he was saying that going from a 2 pass to 3 pass leaves minimal power gains not going from 1pass to 2 pass which obviously gives lower intake air temps.
whats this 1pass and 2pass stuff???/
thanks for any info
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Originally Posted by 06black
whats this 1pass and 2pass stuff???/
thanks for any info
thanks for any info
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These upgrades are fairly simple if you know your way around the engine bay. As soon as I save up the money I will be doing this build up. I'd conservatively say this build should run you about 2 grand plus...If you do everything yourself...
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Originally Posted by Jmc007
Also, what is not good for the Cobalt SS owners reputation, is all the kidders who claims that their cars makes 250 WHP bone stock, but drive their car to a 14.8 or 15 second quarter mile. Ok I tried to help, period.
Yup, I know a lot of guys with moddified quad 4 grand ams who run 14.7-15.0 and can't understand how the SS S/C aren't much faster if they are making 210WHP.
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Originally Posted by MikeSS
Yup, I know a lot of guys with moddified quad 4 grand ams who run 14.7-15.0 and can't understand how the SS S/C aren't much faster if they are making 210WHP.
#25
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they welded a plate to reroute the coolant back into the manifold and back around again
the pics i have of it suck, i printed the book in the library, but have all four save on a disk
i would think it would be easy but cant see how they get it to only loop twice
the pics i have of it suck, i printed the book in the library, but have all four save on a disk
i would think it would be easy but cant see how they get it to only loop twice