So, it seems that most people that want the 2.4 manifold feel that the losses experienced during driving on the street are more than worth the gain at the track. I didn't think so, but thats probably because I have an '05. For you '07 guys it seems to be better all around. So my question is: Has anyone seen an appreciable decrease in their ET/ increase in trap speed after installing the 2.4 manifold? I keep seeing people mention that they will test it soon, but has anyone actually gone to the track? Seat of the pants dynos don't count; mine sure fooled me with this mod. Thanks.

 

Me and a buddy raced before and after. Our results were pretty much par for the course. First race was a d2d run from 40-100mph. He has a 2.2 Cobat coupe 5spd with intake/exhaust. My HHR is a 2.2 5spd, GMPP manifold, SS/SC catless DP, 2.25" exhaust. (think weight has a disadvantage here? )

From the "Before Mani" run we were door to door from 40-100mph. When we did an "After Mani" run we were door to door through 2nd, I gained a little in 3rd, and was pulling away into 4th gears. We got the runs on tape and hopefully will have some vids up soon.

I know its not the track post you were looking for but hope this helps!

 

Better than nothing.



So, does anyone have concrete #'s to show? Just curious because for all the hype no one has posted any slips. (That I know of )

 

can u guys get an increase with it?

 

There has been some discussion about that. There is a gain in the higher RPM's but a torque loss mid-range. The problem is that the gains and losses seem to depend on what model year you have. Those with '07s seem to get decent gains in the high rpms. (~13 peak whp/ 20+ whp at redline) Once they get past the torque loss, the torque also seems to come right back and actually gives them a few extra peak lb ft. I have an '05 however, and when I dynoed it, the torque curve was absolutely shot. My entire mid-range was gone, so it wasn't worth it to me. Alot of other guys still felt that it was worth it because it would be good for auto x and drag racing. So, I just wanted to see what hard numbers people were seeing that would back up these feelings.

 

Well a buddy of mine has a 2.2 Ion with a fujita intake, LSJ exhaust mani and cat, and a 2.5 exhaust.
His best time before the 2.4 mani was a 15.9 at 86.550mph with a 2.3 60'
After the 2.4 Mani install it was a 16.2 at 88.78 mph with a 2.5 60'

 

that doesn't necessarily seem slower due to the mani just sounds like a worse launch, therefore slower time.

 

I know that is why I included the 60' foot times, so you could compare. His trap speed increased by 2 mph.

 

when i get the money for the mani swap, or if someone bought one and wants to donate it, i'll go to the track and give ya'll some 3's, i rn a constant 16.5, those 3 digits haunt my ass everytime i go to the track...so when i get it im sure i can give some damn good results...if i get a better ET and trapspeed, than the mani helped, if i go higher than 16.5, than is sucks at the track, my only mods, r a gmpp intake an short shifter, so my results wont be to far out there to where you cant compare it with a stocj cobalt ya know, like he ran so and so with the mani, but he so and so done to the car already, like on the crateenginedepot site they claim 13whp...but under it it says thhe car had a intake, exhaust, etc, it was already modded, than they added the swap, so the swap alone wont give a stock balt 13hp...

 

Great Thread did it last night in fact. All i have done is 2.4 Mani, K&N and no resonator. I also had the 145lb weight reduction. I had never been to the track before. 15.97 first run and my best actually. I never had a great launch I didn't get instruction on how to launch till I had left. So 15.97 with 2.49 60' for me. I'll post up tonight. I can see a 15.8 or better with a better driver.

 

You wouldn't want to do this mod without the other ones first, anyway.

 

Yeah, open up the exaust first.

Was the weather any different between the two trips to the track? That will make some difference as well.

 

It was about 15*'s hotter on the new run with the mani

 

Remember too that our 07's have a couple of different parts than your 05's do. If I remember right we got the LSJ headers on ours so the 2.4 manifold does a little bit better since our headers are different than the 05's.

 

^^^Its true that you guys have different stock parts than the '05, but I have a full aftermarket exhaust. I think the difference is due to the different tune the '07s have.

 

yup... its the different tune... stock the 07's get a few extra ponies but they have a better A/F ratio that really gets taken advantage with the mani

 

i droped a tenth and gained 2 mph after my 2.4. mani install with a 2.4 60 ft.

 

Thanks 409.


I would also be curious to see if there is an effect on the 1/8th and the 330.

 

no problem. ill see if i can get my time slips from the track when i get home. im in one of my night classes right now . i think i should have about 8 of them...

 

Anyone else have numbers?

 

This is a great thread! Thank you to the O.P. I have an 04 2.2 Ion and have been debating back and forth whether or not to get this mani swap. It looks like on the ced site, that the mani gives a pretty decent Hp. gain, but I'm worried about the torque loss. I've never been to the track either, so I don't wanna salvage my performance as far as a daily driver goes. Keep those numbers coming!

 

if i remember the car that was dynoed for that site had other things done with it and some of the guys with earlier models didnt see some of the gains that the new cars have...

and there will be plenty of car left for daily driving, no worries about that...

i also went and looked at the rest of my slips from the track and my 60ft was somewhere between 2.4-2.5. my traps were all 85 and some change and the ETs were all 16.5 or 16.4 with a .6 to .8 reaction(accept one red light, i went .3 somthing). hope this helps everyone. i know im not the best driver and i cant launch worth a crap but im workin on it so when i go back next weekend i will see if i can improve...

 

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