Has anyone else decided to put the Ecotec H.O. 2.4 intake manifold onto there boosted J besides me?

I will say that from my experience with this manifold, it was more than just a simple bolt on affair. I found that a number of small modifications had to be performed to get everything to work just right on our cars,



^^Photo courtesey of PJ Da Flyin' Skwirl
First off, as seen in the pic above, there are a number of holes in the top left corner of the adapter plate used on the manifold.. The one that PJ marked in red is the hole you must drill out in order to let air flow through four your IAC system. The topmost bolt is the one used on the j-body setup. The 2.4 setup uses the one down and to the left from that. It forms the perfect "square" bolt pattern on the 2.4 intake manifold. This bolt must be bolted down or the corner of the throttle body and adapter plate will lift up and cause an air leak.

With the setup on our cars, the throttle body doesn't allow for enough space to fit a bolt at the top left corner. I had to remove some material from the IAC housing and from the side of the throttle body, and I also had to use a smaller headed bolt in place of the one supplied with the Crate Engine Depot kit. After a few hours of work and a bit of luck, I managed to get everythig properly lined up and set correctly.

With this manifold on a boosted car, I must say the difference is PHENOMINAL!!! Not only in seat of the pants feel, but the pull from the car is alot more noticeable. From a roll on the highway, the torque curve is much more broader and flat than with the old manifold.
Also, around town driveability is improved as well. It seems to have a bit better throttle response and better out of boost acceleration.

One noticeable difference is with my current suspension before this manifold, I could take off from a slow roll in first and break the tires loose slightly as the car built boost. With the new manifold, the tires will spin like crazy through first and halfway through 2nd like they did with my old stock suspension.

One thing though, the PCV vent in the center of the manifold between ports 2 and 3 MUST GO!!! I found out that with the design of the PCV vent gasket, when in boost, air will actually be forced backwards through trhe manifold and create some nasty blowby out of the breather in the valve cover. Also, when not in boost, the car will suck excessive oil into the intake manifold. After 2 days of driving I was down 1/2 quart of oil and found about 4 ounces puddled in the bottom of my intake runners!!! After taking the manifold back off and cleaning everything up, I used a thin piece of metal to completely block off the PCV vent and the problem was fixed. No adverse effects whatsoever!

Also, the 2.4 manifold doesnt have the extra vacuum port on it that I used on the old 2.2 manifold. I simply had to tee into my brake booster line to get the required vacuum.

All in all I say that this is a very worthwhile mod for the boosted eco's as well as the naturally aspirated ones. A much flatter torque curve with increased allaround power can be expected. Anyone else have feedback of this manifold on a boosted J???




Currently #4 in Ecotec Forced Induction horsepower ratings. 505.8 WHP 414WTQ!!!
Currently 3rd quickest Ecotec on the .org - 10.949 @ 131.50 MPH!!!

idk why there aren't any responses yet but I hope to have some feedback as well soon

Do you think the PCV valve would suck oil on an naturally aspirated car? As you said its probably best to eliminate the manifold PCV and either continue to use the vent on the tubing or use a breather filter. Shouldn't the vaccuum at that postion be the same as on the intake tubing at WOT?

This is really the first performance review of this mod that I've read, aside from the one on crateenginedepot.com w/ dynos. Thanks for taking the time - that goes for u too skwirl!

Well, i had my car dyno'ed at the bash yesterday, and it definately needs retuned with this manifold on, my AFR's were about 12.5 to 12.8 at WOT, definately a huge increase in air flow. Because of that my horsepower numbers were lower than expected, but I definatly noticed a nice torque curve.

BTW, I dyno'ed at 209.5 horsepower and 246 ft/lb of torque at the wheels even with the lean AFR's I wish I had dyno numbers before the manifold, but I believe it did help on the torque side of things.

And yes you can just use the breather nipple off of the end of the valve cover and use a breather filter or oil catch can setup if you block off the PCV vent. I noticed it seems to saturate the breather with oil every few days or so. I just take it off and clean it, but i'll probably implement a catch can or something here eventually. Either way is better than sucking a quart of oil into my intake manifold every couple weeks.

Pj, sucks you didn't make it to the Bash, but we hope to see you there next year, and your car better be bad@$$!




Currently #4 in Ecotec Forced Induction horsepower ratings. 505.8 WHP 414WTQ!!!
Currently 3rd quickest Ecotec on the .org - 10.949 @ 131.50 MPH!!!

Wow, thats amazing torque! Are you able to post up the graph? What AFR were you tuned for before the manifold install? I can't wait till I can purchase this mani

iirc he was tuned a little lean. Matt and I talked to him for a good hour on tuning the eco for boost. His car sounds really strong and good. I could only imagine there's another 15 whp in that car with just tuning fuel... he has a great starting point



LE61T PTE6262 Powered

I'm probably gonna contact Rodimus within the next couple of months about tuning my car. Hopefully I can break 250 WHP, which should be pretty easy at 12PSI of boost




Currently #4 in Ecotec Forced Induction horsepower ratings. 505.8 WHP 414WTQ!!!
Currently 3rd quickest Ecotec on the .org - 10.949 @ 131.50 MPH!!!

I just want to make sure I understand what you did here. Am I correct that you used the 2.4 eco that comes in the cobalt ss non sc intake manifold on your boosted 2.2 eco?



FORGET GIRLS GONE WILD WE HAVE GOVERNMENT SPENDING GONE WILD!

Wade Jarvis wrote:I just want to make sure I understand what you did here. Am I correct that you used the 2.4 eco that comes in the cobalt ss non sc intake manifold on your boosted 2.2 eco?

yes which is our H.O. manifold.

The title is just a little vague. Eco anywhere in the title would have made things just a litte easier for us LD9 guys.