• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Improvement Questions.

IrishNation24

IrishNation24

Ridin' the Blue
alright guys, i have a few questions about getting a little more power out of my 2001 GTP. right now the car is completely stock. so it has 240 hp, 280 ft-lbs torque, as you all know. it runs 0-60 in about 6.5, as far as the rest goes, i don't know because i haven't done any testing with it. what i am wanting to do is increase the hp, and TORQUE to get it to run a little faster, to be able to back up its looks a little better. i'm not the most mechanically inclined person, i just have the general knowledge about it.

question: how much smaller of a pulley can i put on, without putting to much pressure on the engine and supercharger. and how do i know what the engine and supercharger handle?

so if i wanted to put say a 3.5" or a 3.4" pulley on it, would adding a borla exhaust and cold air intake be enough. or would i also need to upgrade the headers? also a few other questions, what about putting in a performace chip( i dont actually know how to do that or where it goes, but i've heard of people doing that to get a little more power.) another question, i've read some other posts about exhaust systems, and they were talking about a downpipe and ubend, what is that? and ive seen post about scanning for KR, what is KR?

so overall would adding:
borla exhaust
cold air intake
header upgrade
performance chip(maybe)

be enough to handle a 3.4 or 3.5" pully.

as i said, all i'm wanting to do is add a little more power to get it closer to 300 hp/tq and closer to under 6 second 0-60. i just want it to be able to back up its looks a little better (i will be adding a ram air hood, new wheels, chrome grill, and a new paint job with effects, have already put LED taillamps, and clear corner lights and new fogs). right now it has 72000 miles on it. its in pretty good shape, haven't had any mechanical problems since i got it with 50k on it. i do all the routing maintenance myself, and i dont mash the pedal all the time(just half the time, LOL. and when im in the front of the line). i dont want to put too much strain/pressure on the engine, and i dont have the money to upgrade everything, but i dont want to anyway. just a little more power is all i need. ANY comments or questions, and for sure any suggestions are welcome. THANKs for your time. :cool::th_thumb-up::th_thumb-up::th_thumb-up:

also, to anyone who has done exhaust system, what have you done? im looking for a deeper and louder sound, but not like a rice wagon cherry bomb

and does the downpipe go in place of the u-bend?
 
Last edited:


First off...thanks for the book :p

KR is bad lol...read here: http://www.grandprixforums.net/f18/what-is-octane-kr-explained-here-1507.html

Another thing is these cars don't have "chips" they have PCM's and they are tuned. You can get one from:

3800 Performance - high performance aftermarket car parts for your Grand Prix, Monte Carlo, Impala, Regal, Bonneville, and V6 F-body!!
INTENSE-Racing.com - G8, Grand Prix, Bonneville, Regal, L67 3800 Supercharged Performance Products.
:: Overkill Motorsports ::

Any of those are great PCM's...just be sure not to buy PCM's from ZZP as they don't have a reliable tuning source anymore. They are junk.

Pulley drop...go read some threads...that is the last basic bolt-on mod you want to do.

As mods go...if I could do it all over again...I would get in any order really...

180* Thermostat
Autolite 104 Spark Plugs
PRJ 10.4mm Wires
SLP/ZZP/Pacesetter/SS Autochrome Headers (Any of them work)
Some form of Intake (K&N is junk and the SLP/Wizaird/MSP aint great either)...make your own for $50 or so...
Tuned PCM of your choice.
3.5" or 3.4" Pulley. If you want to mod past this then opt for the ZZ Performance Modular Pulley System.

Hope this helps.
 
and just remember thats crank horsepower. its not putting that down to the wheels. maybe 200ish to the wheels. but im sure a basic 3.4/3.5 set up will net you the gains your looking for.
 


Sabrewings said:
You're supposed to go to a smaller belt with a 3.4.
Click to expand...
so how much smaller of a belt. im not even sure what the original belt size is.



and one more question. i've been looking on zzp and other places, and theres so much damn information i don't even know whats right anymore. if i put a 3 inch exhaust system from zzp or anywhere else, does that delete the ubend and add a new downpipe, or do i still have to do both of those things seperately. and would i need to add headers, cuz the stock are only 2.25" aren't they? i sound like a idiot, but im just getting really confused
 


IrishNation24 said:
if i put a 3 inch exhaust system from zzp or anywhere else, does that delete the ubend
Click to expand...

3" exhaust is a waste. And no the catback exhaust doesn't affect the u-bend. The u-bend is part of the downpipe.

IrishNation24 said:
and add a new downpipe,
Click to expand...

Downpipes are either sold with a set of headers or sold separately if you want an upgraded replacement to the stock.

IrishNation24 said:
and would i need to add headers, cuz the stock are only 2.25" aren't they? i sound like a idiot, but im just getting really confused
Click to expand...

The most constrictive points in the stock exhaust system are the stock downpipe (to include the u-bend) and the front manifold. The catback is fine as it is. Depending on how far you want to go in modding you could get a downpipe and Plog. If you want to go further than you should get a set of headers.

Here is a link that shows the entire stock 3800 exhaust. Should help you visualize some of these parts:

http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=13427&highlight=exhaust
 
Sabrewings said:
3" exhaust is a waste. And no the catback exhaust doesn't affect the u-bend. The u-bend is part of the downpipe.



Downpipes are either sold with a set of headers or sold separately if you want an upgraded replacement to the stock.



The most constrictive points in the stock exhaust system are the stock downpipe (to include the u-bend) and the front manifold. The catback is fine as it is. Depending on how far you want to go in modding you could get a downpipe and Plog. If you want to go further than you should get a set of headers.

Here is a link that shows the entire stock 3800 exhaust. Should help you visualize some of these parts:

http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=13427&highlight=exhaust
Click to expand...


thanks for the post! pics really help. and just to be sure, PLOG is basically and upgraded manifold, but not as good as headers right? and is the crossover pipe fine as is, or would i need to upgrade that with the headers, cuz the one in that picture doesnt even look right. sorry to keep adding questions, just tryin to learn.
 
Last edited:
IrishNation24 said:
thanks for the post! pics really help. and just to be sure, PLOG is basically and upgraded manifold, but not as good as headers right? and is the crossover pipe fine as is, or would i need to upgrade that with the headers, cuz the one in that picture doesnt even look right. sorry to keep adding questions, just tryin to learn.
Click to expand...

that is correct a PLOG is basically a ported manifold which is a upgrade but not as good as headers, if you get headers they come with the crossover to connect the front and rear, but if you go with a PLOG you have to order one separately although i know some people that get a PLOG and just keep the stock crossover
 
IrishNation24 said:
thanks for the post! pics really help. and just to be sure, PLOG is basically and upgraded manifold, but not as good as headers right? and is the crossover pipe fine as is, or would i need to upgrade that with the headers, cuz the one in that picture doesnt even look right. sorry to keep adding questions, just tryin to learn.
Click to expand...

The crossover is fine if you just want to get a bigger DP and the Plog. Not sure what you think isn't right about the crossover in the pics since they're all the same. There is no upgraded version available (only headers if you want to go that route). I currently have a ceramic coated crossover to help keep the radiated heat down and to keep the exhaust hot as it leaves the engine bay.
 


My best advice to you is to read, read, read, read, read, and read some more. Then read again. You need knowledge to do these cars properly. Then get a scanner before you do anything. I know, it sucks because it does not make the car faster. But, you will use it and it will keep you from blowing the damn thing up. There was a previous post that had a basic list to run a 3.4/3.5 pulley SAFELY. You may not need headers. I just installed a PLOG(If you get one, get the stainless steel PLOG) and it helped the top end and lowered my KR to a few blips of 1*. I will end up with headers, I know it, but that is because I want to drop to a 3.25 later on. But as far as the 3.4, What I have to support it is working for me.
 
i think when it comes time to do it, ill do headers, dp, ubend delete, and borla or magnaflow exhaust. probably take it to a shop and tell em that and see what they say.

where can i get a scanner, or is it pretty cheap to just take it to a shop to do it?
 
IrishNation24 said:
i think when it comes time to do it, ill do headers, dp, ubend delete, and borla or magnaflow exhaust. probably take it to a shop and tell em that and see what they say.
Click to expand...

If you get headers, it comes with a DP and thus the u-bend delete.

IrishNation24 said:
where can i get a scanner, or is it pretty cheap to just take it to a shop to do it?
Click to expand...

You'll want something permanent in your car so you can keep an eye on things. Either an Aeroforce or Scangauge II is the sort of thing you want.
 
Sabrewings said:
You'll want something permanent in your car so you can keep an eye on things. Either an Aeroforce or Scangauge II is the sort of thing you want.
Click to expand...

i couldn't find a post specific on how to install one of these. is it just something you plug in somewhere on the car and thats it?
 
You must log in or register to reply here.
Back
Top