I've searched and didn't find much info. I've *heard* that porting the stock GSR intake manifold yeilds better results as far as midrange/lowend than the popular skunk2/blox single runner intake manifold.

I would like to know what needs to be done to the manifold to get good results as far as hand porting goes? I have an extra manifold but I haven't taken it apart to check it out. Is it obvious what needs to be done to clean it up?

My dad was telling me that I should have it Extrudehoned; is that a better choice?

Thanks guys

 

Its alot of work, and you'll gain some top end. You'll definitely loose some low end and mid range. Not worth it IMHO.

 

I had my GSR intake manifold ported and polished. I love it. Yes it will yield very nice gains in the mid range. The biggest gains I had where between 4k and 6k, in some areas I gained 7 hp.
I also looked into Extrudehone, way to expensive. Maybe if you are looking for the very last little bit of power out of a racecar.
My tuner has a single runner intake manifold on his GSR and did get all the mid range back that he lost but it take a ton of time on the dyno to get it back.
I also had the intake manifold port match to my 64mm TB.
When I get the cylinder head PnP'd I am planning on have the butterfly valves replace with larger ones maybe 0.5mm-1.0mm, each valve.
Also I make 174whp/133tq on stock GSR head and cams. Amazing on the street.

Pics of my intake and dyno on page #2.



Modified by OH_1fstgsr at 7:50 PM 12/1/2006

 

extrude honing is garbage!!! do people not know this yet? many engine building companies also offer porting services on the gsr manifold which seem to be making amazing numbers. these however are done by either cnc or by hand, no extrude honing.

 

I saw this one a while back.I think its Ericks Racing's.




I found some more pics of it.Call Erick he has two of them .The other one is a little bigger than this one.


Modified by need longer days at 9:17 PM 11/27/2006

 

interesting. i havent seen that intake manifold before

 

Since porting is so labor intensive, I figured I would give it a shot since I've got more time than money.

I was just wondering what needed to be done to the manifold to get decent power out of it. I was hoping it would be obvious when you opened the manifold up and saw all the terrible casting flaws that were causing the restriction. I havn't opened up the manifold but I looked in there and didn't really see anything that was obvious so I thought I'd ask you guys.

Anyone have pics of their ported gsr manifold?

 

Erick's racing right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by need longer days &raquo;</TD></TR><TR><TD CLASS="quote">I saw this one a while back.I think its Ericks Racing's
</TD></TR></TABLE>

B16 head

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fabman &raquo;</TD></TR><TR><TD CLASS="quote">Erick's racing right </TD></TR></TABLE>

Randy from RMF made that, no? Or you? I've seen it before but I can't remember who posted it.

 

can they be purchased?? suppose i could call them

 

So that manifold has the butterflys and plenum removed and replaced with a bigger plenum? That's a B16 head? Hummm....

 

I wouldn't mind seeing some dyno sheets, I just hate the way stock GSR manifolds look!

 

i was looking into porting my gsr throttle body too. up for an answer....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shyboi4u &raquo;</TD></TR><TR><TD CLASS="quote">i was looking into porting my gsr throttle body too. up for an answer....</TD></TR></TABLE>

Send it to Maxbore. He had a banner running on H-T awhile back, not sure if its still there. Somebody can hopefully post his contact info.

 

http://www.maxbore.com

 

that would be nice for a h22

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSvtecMike &raquo;</TD></TR><TR><TD CLASS="quote">Send it to Maxbore. He had a banner running on H-T awhile back, not sure if its still there. Somebody can hopefully post his contact info. </TD></TR></TABLE>
opps, i meant manifold

 

fyi if you would be able to buy that bottom portion of the intake manifold you would still have to port the top half too...

 

I too, wanted to port a GSR IM, and didnt want to buy an aftermarket IM like Skunk2 and etc. Someone had posted this website, and this shop does a complete porting for $410 ....... here is the link http://www.importbuilders.com/intakemanifolds.htm is their anyone else who ports GSR IM 's ? I'd like to port the spare GSR IM I have.

 

DPR did my GSR intake manifold. I have pics and a dyno I'll be posting very soon.

http://www.dprracing.com/prod&...g.htm

 

Oooohhh, I'd like to see pics and a dyno, OH_1fstgsr. Please post when you get a chance.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OH_1fstgsr &raquo;</TD></TR><TR><TD CLASS="quote">DPR did my GSR intake manifold. I have pics and a dyno I'll be posting very soon.

http://www.dprracing.com/prod&...g.htm</TD></TR></TABLE>

So $340 for the total package , thats not to bad, better than $410. Is that what you paid, $340 ? Id also like to see dyno chart too.

 

yeah, $340 isn't bad but, for myself, I was hoping to be able to do it myself. Like I said, I've got more time than money and access to porting tools.

I think I might just take the manifold apart and take a look at it and if there is anything obvious then I'll take care of it.

 

Before

20manifold/IntakePics001.jpg]http://i102.photobucket.com/al...1.jpg[/url]




After