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View Full Version : HO mani swap read

Dayton86
11-20-2007, 06:08 PM
For those that have done it or considering doing it, here is a little information for you. It might explain why i lost 3 mph and .6 seconds between runs when all i really swapped was the man and a UD pulley. Looks like soon i shall be going back. Now on a high reving or boosted 2.4 the case may be different.

Enjoy the read.

http://www.j-body.org/forums/read.ph...00177&t=400177
boost21
11-20-2007, 06:27 PM
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Dayton86
11-20-2007, 06:44 PM
Linking just pwned me, basically dude lost 7 hp and 10 ft lbs of torque by swapping from the stock LD9 intake mani to a port matched 2.3 HO mani. It worked on another posted too, o well cut and past got me.
Matt95GT
11-21-2007, 09:23 AM
Don't copy the link from within a thread, or it will be incomplete.

We'd probably like to see this evidence, otherwise it's hard to go by just one persons word.
urweak
11-21-2007, 06:37 PM
http://www.j-body.org/forums/read.php?f=2&i=400177&t=400177

dont really know what to say. Could be true, or could be some type of human error involved.
Matt95GT
11-26-2007, 09:17 AM
http://www.j-body.org/forums/read.php?f=2&i=400177&t=400177

dont really know what to say. Could be true, or could be some type of human error involved.

Thanks.

Yea... I'm not so sure this is correct/conclusive...
http://registry.gmenthusiast.com/images/neomas77/dyno.jpg
(copy, open new browser/tab, paste to work around referral blocking lameness)

I would agree if I saw peaks cross over each other and show that HO manifold only has peak up high, etc. This looks more like the whole power curve has been shifted (peaks, dips and all) which could be caused by numerous other things.
spy
11-26-2007, 01:52 PM
im more under the impression that the ho manifold swap is better utilized by a motor that has had more than just an intake and exhaust. since the ho manifold as we know tends to be quite the flowfull bastard I would go as far as to say this. the ho mani needs to be coupled w header exhaust some reasonably better cams over stock t least a stock 2.3 throttle body and I would also have some headwork and a retune for good measure.

the more I look at the dyno the more inclined I am to say that it wasn't exactly a scientific comparison.
Dayton86
11-26-2007, 04:08 PM
Me and a few others seem to be in agreement that for a motor nuilt like his would actually benefit form the L.O. intake mani and a header. You can only flow in as much as you can flow out, in a reality. The cams are those from a 2.3 and the only real difference in the head between the 2.3 and 2.4 is the exhuast flow, which can be fixed. Also the L.O. mani was built for a motor with similar redline as the 2.4, it just seems to be a better match for me.
spy
11-29-2007, 06:37 PM
Me and a few others seem to be in agreement that for a motor nuilt like his would actually benefit form the L.O. intake mani and a header. You can only flow in as much as you can flow out, in a reality. The cams are those from a 2.3 and the only real difference in the head between the 2.3 and 2.4 is the exhuast flow, which can be fixed. Also the L.O. mani was built for a motor with similar redline as the 2.4, it just seems to be a better match for me.

I'm under the impression that the LO manifold is a waste of time to undertake. If that was an option I'd leave the 2.4L intake manifold as is, and just slap in a larger throttle body.

Any person who is going to stick to the bolt on route and not crack open the motor should just go intake, t/b, header, exhaust, LGO crank pulley, MSD coil conversion (never have misfire troubles again!), tune and call it a day. IF they still want to go faster and don't want to spend the cashola with takin out the motor, etc. My next recommendation would be a properly tweaked nitrous setup. After that would be simple weight reduction.

If you are building up an N/A or boost motor, or even just sticking to some headwork, HO manifold go go go.
Dayton86
11-29-2007, 08:48 PM
Yeah i just went back to the junkyard yesterday to get all the stuff to swap back to the original intake manifold, of course opened up to match a quad 4 throttle body. I just got to order a new intake because i cut up my other one to fir my mani swap. First though i got to go in and do the waterpump, timing set, and "secret" cams. Anybody want a LO mani? j/k
spy
11-29-2007, 09:48 PM
no headwork? :*(
Dayton86
11-30-2007, 10:49 AM
I will hopefully get a head from the junkyard next time I go to the junkyard. I havent decided if I am to build an LD9 head or 456 head, main reason being the 086 is not a choice is it has a tendency to crack and this will go in my only car thus being my daily driver. I am still undecided on my final direction of this car, all I know is I want it to look as stock as possible, including the auto-tranny.