Is it better to have the northstar throttle body or get mine ported at my local machine shop?
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03-20-2011
Is it better to have the northstar throttle body or get mine ported at my local machine shop?
03-20-2011
If youre N/A and staying that way Northstar would be too big.Id say just get your stock one ported 3-5mms and you should be good.
03-20-2011
Will there be much benefit with the northstar if I supercharged my gp or can I stick with porting my OEM and still supercharge it later?
03-20-2011
Ported stocker would be all you need untill your talking small pulleys
http://www.streetfire.net/video/2001...ynp_208097.htm
03-20-2011
Get a tb from a s/ced car
Normally aspirated tb from zzperformance:
stock 65mm bored out to 68mm
Supercharged tb from zzperformance:
stock 69mm bored out to 72mm
Some epoxy work on the back side of the t/b may be required to fill the holes on the supercharged t/b to seal properly, but if you plan on going s/ced in the future you might as well start off with the larger bore t/b, and port it if you wish.
Even if you dont port out the t/b of the supercharger you have a larger opening than the ported n/a t/b.
03-20-2011
porting the TB blade isn't what you should be concerned with.
its the MAF hump thats the issue.
remove the hump and have your car tuned.
03-20-2011
MAF hump? What do you mean any pictures of it?
03-20-2011
Go to zzperformance website under:
-air intake and fuel delivery
The images for the ported maf sensor is shown with the ported tb's
Do a search for the following on there site:
Pontiac GTP High Velocity Throttle Body Info
You will link to an article with images of the newer maf hump and older maf splitter, they only stage 2 port the newer maf hump although others have done both. This will require the computer be tuned fot the larger area around the mass air flow meter. (zzp suggests this for 12 second 1/4 mile cars)
I would suggest seing if a supercharged tb from the same era 97-98 or 99-03 has the same opening around the mass air sensor, negating the need for a tune, allowing you the benefit from the ported t/b blade.
03-20-2011
Originally Posted by 98gtp
GT Throttle body= .021 grams a sec of air
GTP TB=.024 grams a sec of air. Tune will be needed
http://www.streetfire.net/video/2001...ynp_208097.htm
03-21-2011
Well since this is the N/A section I'm assuming your in need of more air since you have a laundry list of mods?
Larger TB would be needed for a Cam/Heads/Header/HV3 setup...At the point of a cam/headers alone I'd have the stocker ported...I don't think ANY N/A guy would be needing a Northstar...a ported L67 would suffice PLENTY of air for any non-boosted car. But, IMO....unless you have a cam or rockers...and headers...or even a HV3 and or headwork...then your in no need of a larger TB. If you don't have any mods...maybe I suggest Speed Daddy headers, with some form of an air intake (whichever you may prefer but Fenderwell's seem to work better on N/A apps), an HV3 Upper Insert, with ZZP ER Rocker Arms or one of their cams...either a GT1 or GT2...
03-21-2011
Is there more than one of those screens on or around the intake?
03-21-2011
It's the MAF screen.
Leave it alone.
It smooths out the readings the MAF gets.
03-21-2011
Just wondering but it looks to me that its clogging up the air way. Clogged air way = less throttle response? My uncle who has worked as a GM mechanic for 30+ years says its an unneeded part and to leave it out to increase air flow, but he says MPG may drop a bit? But i will see better throttle response so idk.
Thought this would be a nice thing to chat about
03-21-2011
it does not need to be removed EVER. it makes it so there is laminar flow across the MAF. tell your uncle he doesnt know anythign about MAF cars and should stick with carburators.
it is not a flow restriction. just leave it alone.
03-21-2011
Will a JET MAF sensor work on are cars?
JET Performance 69108 - JET Powr-Flo Mass Airflow Sensors - Overview - SummitRacing.com
03-21-2011
Is there any other place to get a Power Log Manifold zzp is all out of them?
03-21-2011
Buy headers.
They are cheap.
$200 bucks or so...Speed Daddy's on EBay.
03-21-2011
go used.
as long as its stainless it'd be fine.
03-21-2011
I thought the Powerlog manifold was poorly casted so id like to replace it please help me find one i've done so much googling with out any luck
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