GT to a GTP

Hey everyone. New to this forum. Little back ground. Worked for a local Honda dealer, and had them quote me price on 97 GT they had. They quoted me for a Grand Am. $9200 is what I paid. I really wanted a GTP and seeing Im a Honda man who likes to swap motors I have decided to change my GT into a GTP. I drive over 160 miles a day to work and have found many motors out there sale. So I'm doing my research and look at buliding the motor with everything possible done to it. I am shooting for the over 350hp mark.
I will let you know how that goes.

i like Grand Prix GTP :flash:

i also want to change my gt into a gtp. how expensive do u think it will be?

very, different engine for one.

more details at www.clubgp.com/forum
do a serach

you are prob looking at $3500 or more

$3500 to make a regular grand prix gt in to a grand prix gtg??? who cares about the leather seats and all the other bull that comes on a gtp the way i see it is a gtp has the same moter as a regular gt but with the supercharger. i bet that someone can find a supercharger to add to the series 2 motor and make it more powerful than a gtp.

"the way i see it is a gtp has the same moter as a regular gt but with the supercharger"

Also differnet heads, intake, compession ratio, lower end on a L67 is stronger, PCM....

Goto Clupgp.com, ZZP is working (might already be out) on a Centrifical SC for the GT.

A guy on there added a SC to his Impala, but it's more than just bolting it on.

the cost and everything that is involoved in doing the change over is going to get real expensive like 5-6k expensive. we will start in the back of the car, the fuel system is different and will require a different pump, onto the interior, the DIC (driver information center) is different, the shift knob will need to be changed to allow for the Performance shift (only avalibe on GTP's unless you have the DHP PCM) Now on to the engine. The motor in a GTP is a L67 not like the L36 that is in your GT. The GTP motor has differnt pistons and heads, the GTP has the fuel injectors in the heads as the GT has them in the intake manifold, there are about twice as many vacume lines on a GTP becuase of the Supercharger, the (under hood) fuse block would need to be changed to support the new dual stage fuel pump and have relays added. then there is the PCM, wire harness, and the list goes on.

Its really not worth it to be honest. For all the time and effort to put it is not worth it. Plus you have to add the cost to have someone put it in. I checked into it and was like screw this I rather just get a DHP PCM and some other mods for that cost.

Listening to Brandon Budd makes me feel just *this much* smarter. Yes. you do have to do more stuff to a GT to make it exceed the performence of a GTP. It's not as simple as popping a supercharger in there. There's all that shit you gotta do. If you want to make your GT a GTP, just sell your GT and buy a GTP... The conversion process would be too much of a hassle and definantely would not be worth the money. If you just get a GTP you can hop right the modifications if you wanna.

In response to Scott 02's statement about exceeding the performance of a GTP once you put a supercharger on the Series II GT motor: If you get everything setup so you can have a supercharger (a pretty good list of stuff), suceeding the performance of a STOCK GTP wouldn't be too difficult.. Hell.. all you need to do is put a supercharger pulley of a lesser size on (the lesser the circumference of the pulley, the more boost) and that's what? 30-45 Horsies right there (depending on the size). The stock supercharger isnt at it's peak ability for warenty reasons, it only runs 8psi@redline :). If it were, then more stress would be on the engine, meaning they'd be replacing a lot of engines if people have the warranty for the car still :)

I have to ask. Why don't you sell the GT and buy a GTP? Has to be a lot cheaper.

yeah, youre right... just so u kno, the last time someone touched this thread before you was almost 2 years ago, so.....theyve prolly made their decision

Sometime it's fun to look into the past. I think this one was kind of dumb anyhow.

i have to ask.. why did you reply to a post that's like 2 YEARS OLD??

hmm guess i was beat to the punch

I'm still waiting on the guy that said he was going to buy a 1998 GTP with 104,000 miles on it for $9,000.00. I have one I will sell him for $8,500.00. Have to find them in a corn feild some where.

wow. a 98 gtp w/ 104k is worth about half that. I just bought a 99 gtp w/ 90k fer 7.5 grand and its in perfect condition w/ all available options, and since pontiac made some improvements on the 99 model, the 99 is worth like 2g more than the 98. I donno where u guys got 9g, but since u obviously like going through very old posts..... r u sure this guy wasnt planning on paying 9g fer it three years ago, when it was worth tht? :iceslolan ....just a thought

My one GTP shows, 103,000. Motor has about 500 on new motor. I run a Thrusher cold air box, 3.4 pulley and some killer rocker arms. Just posted a new thread on my other one. Made same changes on this one. Now my gas mileage has dropped like a mad man. Can't figure it out. Dropped from 18 to 15.7. Air box should give you better mileage. But it's not.

you wont get better mileage if you drive w/ a heavy foot. i gotta go, but ill explain more later

The only time I get into it is when a "1/4 Pony" wants to show off his 5.0, then I have to. Have a good night.

okay, so like i was saying, a cool air intake wont help gas mileage(especially w/ a smaller pulley) unless you drive very...grandmotherishly... even if your not racing everyone you see, you probably wont save gas. A cool air intake does uses the same idea as a turbo or supercharger9 obviously to a lesser extent), it allows more air into the engine. As you probably remember from chemistry class, oxygen is required in order for combustion to take place, and more oxygen allowes more powerful combustion in your engine, so if you were to drive slowly, you wouldnt need as much gas to get the combustion you need for slow slow slow, everyday driving. More air doesnt always save gas thought, because what it also allows is the combustion of MORE gas at one time, which is what happens when you drive with a heavier foot (even if you dont consider youself to be a personw/ a heavy foot. It really doesnt take much). So even though it is possible to save gas w/ an intake, it is much easier to lose gas mileage. That 3.4' pulley doent help your mpgs eithersuperchargers give very inefficient hp gains, and smaller pulleys dont help his.

Thanks. The GTP is a fun car to drive. The GT reminds me of my Grandmothers car. But, with the price of gas, I may have to drive it to work. Save the GTP for Friday nights and other fun nights.
I have a bunch of other parts on order for it. The way things are going I may have to break the 66 GTO to save gas. And that only gets 4.5 miles to a gal. MAX.
Thanks again

good plan, sounds sweet

Thanks. Have you read the post on a return line coming off the AC that plugs sometimes and soaks your passenger floor. I'm having that trouble with the GTP. Did you ever hear of this?

Kid,

Try www.clubgp.com and search A/C or water on floorboards.

There are probably a few threads about the ac problem.

Thanks. At 55 I don't get called "Kid" a lot.
Just received a email from a guy about it. I think I can find it now.
Thanks again

Diddnt mean to be demeaning. Its just part of your Screenname

I didn't take it that way. My wife tells me that I will never grow up.
Cars are my way out of all the junk you find in oyur every day life. Been going "fast" for as long as I can remember. Been hitting dragways since 7/20/1966. Last time was 7 days ago.
I take kid as a prize. The kustomkid came from building custom fishing rods (15 and 16 footers) for a long time. Like fishing light line. Have to build your own.
Thanks again

hey now, nothing wrong w/ being a kid... im 16

Hey, I was 16 once. Grow up when you have to. Have fun when you should. And always remember, life is too short.
Thanks again

since we are talkin on a 2 year old post and im like replyin 2 weeks later i dont think its gonna matter, but i got my '98 GTP with 91k on it loaded w/ every option except the fold down infant seat in the back for $6,700, so yeah the whole $9,000 for that was way too much

Here's my 98. Has everything you can get, but baby seat. Only one in Florida with heated seat. No longer close to stock. But GTPs are too much fun to leave them that way.
http://img.photobucket.com/albums/v425/kustomkid54/kustomkid.jpg

Actually, the GT and GTP have different motors. You can't just take your L36, slap on an Eaton M90 from a GTP, and call it an L67. If you'd like to make some serious power, some company just wrapped up 2 years of R&D on a turbo kit for the L36. A bone stock GT is capable of making 280 at the wheels and 350 at the crank with the base kit. I think Planet Performance has it on their site. Good luck.

Sorry, 3800performance.com has it.

Along with the supercharger a new fuel pump, piston heads, more vaccume lines, reprogrammed pcm, diff compression ratio, and a stronger lower end would probably be necisarry if you want to safely run it on a naturally aspirated engie. You will prolly end up swapping your engine for a sc L67, and mabe your tranny for a 4t65e. You might consider just selling your grand prix and buying a gtp, might be cheaper.

But if you do want to go with the turbo there are actually 3 turbo kits out/comming out for gps, cartuning performance(3800performance.com), Intense racing turbo setups(intense-racing.com), and the zzp turbo kit (http://stattama.com)
And there is a centrifugal AC kit, which allowed a Monte to run high 11 1/4 mile along with additional modds (http://stattama.com/index.cfm?fuseaction=detail&id=2322&product=1)

you may have noticed that this is really just a summary of everythng that i /other peole have said in this trhead, for some reason it was reopened, and unless there are new things to say, theres no point in saying them in this thread anymore, just cloggs the server.