What's the most HP I can get out of a GT? After all Mods.

Justin1569 · 12-11-2003, 05:41 PM

If I had 1.5 G's lying around how much HP could i get out of my engine if I threw all this money into modding my GT. Please let me know here. I want a powerful sleeper, then can even beat some stock GTP's.

QuiksilverGT · 12-11-2003, 09:18 PM

That's a good question Justin, one i'd like to know myself, but like $1500 can go a decent waydepending on how you use it. I've looked into it and you can do a lot of mods to your car for free or real cheap, gut your air box and drop a k&N in, new plugs and wires are cheap, synthetic oil (doesnt really make HP, but it does make the engine run w/less resistance), and getting into the money, start with a reprogrammed PCM for $300, ignition coil packs for $150, roller rocker arms & pushrods for like $450, new cam for $300, new downpipe and high flow cat for $350, and a dynomax exhaust for $450 and to really feel it a thrasher transmission shift kit ($100) to put some real snap into your hard work. but as far as the true HP output you would have to put it on a dyno.

(Tell ya the truth, thats like the stuff I want to do to my GT)

TomGPGT2000 · 12-11-2003, 10:12 PM

well this is what im planin 2 do to my gpgt2000... its gona run u more that 1500.. but i think its worth the extra cash..
Borla cat-back exhaust system.. 742.00..
the new s.d. grand prix ram air hood. 725.00 + 20.00 boxin fee.
SLP cold air induction system (selection: 3.8l v6 kit w/ ram air inlet for 1999 and up gp's.) 199.99
roller rocker arms and pushrods.. 450.00.

that all comed out to... 2136.99... give or take a few bucks..

and if you want the outside lookin hot too... im getin the...
american eagle 176 rims.. size and finish: set of 4. 18" x7.5" chrome.. for 949.00
and the street scene speed grills four piece set for... 129.99..

you would also need new tires but i gota look into that... so the total of the outside mods i listed are... 1078.99...
well those are the mods i want.. if anyone has any comments or opinions for me... drop a line... all help is needed...

kilroypr · 12-12-2003, 07:29 AM

Well, to get performance with a low budget. It is important to get a reprogrammed ECU(PCM). Throw in a high pressure fuel pump. Use bigger fuel injectors(lit transam's) and use a K&N high performance filter. After you do this you will feel a respectable power increase without investing a lot of money

The Burning Rom · 12-12-2003, 11:08 AM

NO to the fuel pump...NO to the injectors! Unless you're running a GTP with higher amounts of boost, you don't need the extra fuel! It also requires PCM tuning for the car to run at it's peak.

I also don't suggest getting a cat-back system. It's much cheaper to have an exhaust shop weld a custom one. Besides...mufflers DO NOT add performance. This has been proven already by several GT owners.

If I were working on a $1500 budget, I'd do this:
From www.3800performance.com
TOG Headers + extra coating (<-Is a must) - $790 (On Sale Now)
SLP 1.8:1 Aluminum Rockers & Pushrods - $467 (On Sale Now)
DHP Reprogrammed PCM - $295

http://ww2.netnitco.net/users/cheetah/k3022.html
Wrapped Cheetah FWI Pipe - $95

I know that's a bit over $1500, but performance isn't cheap.

Personally, I'm going with an L67. Costs too much to get speed out of a L36.

TomGPGT2000 · 12-12-2003, 12:07 PM

I also don't suggest getting a cat-back system. It's much cheaper to have an exhaust shop weld a custom one. Besides...mufflers DO NOT add performance. This has been proven already by several GT owners.

so ur sayin if i get the borla cat back exhaust system... i get no more horses?? then what s the point of the exhaust system..??

The Burning Rom · 12-12-2003, 12:26 PM

Quote:

Originally Posted by TomGPGT2000

so ur sayin if i get the borla cat back exhaust system... i get no more horses?? then what s the point of the exhaust system..??

You will gain some HP, just because the system is less restrictive than the stock system. But the gain is not worth the $700+ cost IMHO. The same gains can be had for around $250 at most competent exhaust/muffler shops.

And I repeat that mufflers do not add HP. They modify your exhaust note, but do not have performance gains. Unless you go with straight through mufflers which are damn loud and would probably get you pulled over in most cities.

JJUBECK · 12-12-2003, 03:43 PM

[quote=The Burning Rom]NO to the fuel pump...NO to the injectors! Unless you're running a GTP with higher amounts of boost, you don't need the extra fuel! It also requires PCM tuning for the car to run at it's peak.

I also don't suggest getting a cat-back system. It's much cheaper to have an exhaust shop weld a custom one. Besides...mufflers DO NOT add performance. This has been proven already by several GT owners.

If I were working on a $1500 budget, I'd do this:
From www.3800performance.com
TOG Headers + extra coating (<-Is a must) - $790 (On Sale Now)
SLP 1.8:1 Aluminum Rockers & Pushrods - $467 (On Sale Now)
DHP Reprogrammed PCM - $295

http://ww2.netnitco.net/users/cheetah/k3022.html
Wrapped Cheetah FWI Pipe - $95

I know that's a bit over $1500, but performance isn't cheap.

nothing more to say about this, he's got it.

Justin1569 · 12-12-2003, 04:41 PM

In Numbers, how much hp should my car be at after i throw down b/w 1.5-2 G's. like 2-- somethin wise?

kilroypr · 12-13-2003, 10:29 PM

[quote=JJUBECK]

Quote:

Originally Posted by The Burning Rom

NO to the fuel pump...NO to the injectors! Unless you're running a GTP with higher amounts of boost, you don't need the extra fuel! It also requires PCM tuning for the car to run at it's peak.

I also don't suggest getting a cat-back system. It's much cheaper to have an exhaust shop weld a custom one. Besides...mufflers DO NOT add performance. This has been proven already by several GT owners.

If I were working on a $1500 budget, I'd do this:
From www.3800performance.com
TOG Headers + extra coating (<-Is a must) - $790 (On Sale Now)
SLP 1.8:1 Aluminum Rockers & Pushrods - $467 (On Sale Now)
DHP Reprogrammed PCM - $295

http://ww2.netnitco.net/users/cheetah/k3022.html
Wrapped Cheetah FWI Pipe - $95

I know that's a bit over $1500, but performance isn't cheap.

nothing more to say about this, he's got it.

That looks nice, but, looking at the chetahh tube.
Where the ECU(PCM) will be stored?
WHat about wet roads and splashes?
Do you have one installed?

kilroypr · 12-13-2003, 10:33 PM

Quote:

Originally Posted by Justin1569

In Numbers, how much hp should my car be at after i throw down b/w 1.5-2 G's. like 2-- somethin wise?

Well could be around 50 ponies. A little more or little less.
What is important here that some of the mods would enhance
your torque.
When you have more torque it is easier for the car to attain
speed because is stronger. The HorsePower tells you how quickly
a car can rev up. The TOrque is how much it can carry(you can
think about this like weight) when reving up.
The more torque the better because will have strength to keep
your car going fast on heels or when on hard manouvering.
Keep that in mind.

Ripn12s · 12-14-2003, 01:39 AM

For 1500 I'd do what Rom is doing. L67 Swap

The L67 is a hell of alot cheaper bang for the buck when it comes to modding.

I think that modding a L36 is pointless unless you go with some kind of FI.

Tim

kilroypr · 12-14-2003, 09:22 AM

Well I respect what Rom and Ripn say. But if you do not have a lot of money increasing fuel flow into the combustion chamber and installing a means to push a little more air in will do a nice improvement.
I have a GTP and now what you mean people, but aslo have a Z-34 for which there is nothing and you know there is nothing to enhance it.
SO without modifying the engine internals added a bigger fuel pump, bigger injectors and opened the intake a little(got rid of the box) and the car improved like 15 hp.
And the investement did not reached $450.00

smoovrider · 12-14-2003, 11:37 AM

hey that fwi works pretty tight on my car. and my car runs a lot better wit and i got a gt. putting the K&N in a box i think sucks. water i really dont have a problem wit . it wont suck it up unless u goin thur some serious puddles. i live in fl so i rain aint a problem here. fwi is worth the money i think

The Burning Rom · 12-14-2003, 11:45 AM

When you install a cheetah pipe, the PCM is either zip-tied to the frame or put in a PCM tray (either ZZP, or one from a Trailblazer). The cone does not get bothered by the elements, provided that you don't go driving through any deep water-filled holes.

As far as HP you'd see after the mods, EVERY CAR IS DIFFERENT. Case in point, you take 10 stock cars straight from the factory..chances are they're all going to run different times in the 1/4 mile. That's why you can pick up a motor trend and a Car & Driver and see different times for the same model. It's because the test cars they had were two different cars.

I agree with Ripn12s in the respect that the L67 swap is the best way to go..you get more for your money. That's why I'm doing it. It's not for everyone though. It's not cheap to have done, unless you're doing it yourself. And if you're doing it yourself, it's not exactly an easy thing to do. And it all depends on what your goals are. Me...I have the opportunity to use the dyno at a local place fairly cheap (8 pulls for $50), so I decided to go all out while I have the chance.

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