1998 Grand Prix GTP Bolt-on Upgrades

[wms004]

My buddy has a 1998 Grand Prix 2 Door GTP. I'm very familiar with mustangs but not his car. What are some proven bolt-ons that would wake his car up. Does it have a roots blower in which he could put a smaller blower pulley on? Does K&N's FIPK do anything significant? Any other recommended mods?

thanks

-wade

[kilroypr]

Well there are some mods you can do without tearing the engine appart. You can install a Trasher CAI(Cold Air Induction) kit(Has the K&N 9" cone filter). YOu can install a 3.2" or 3"(I do not remember the number exactly but you will see it on http://www.3800performance.com or http://www.zzp.com or http://www.pfyc.com). You can get rid of the U-Bend(Nice Article about the restriction on the intake and exahust at http://www.zzp.com). All these should add to the car at least ~25hp if the car has the Fuel Pump, Ignition Coils, Spark Plugs, Injectors in decent condition... If you add a DHP V1.0 Modified ECU(PCM) you can add an extra ~20hp. So if the car stock is 240hp. You can put at least ~285hp at the crank without tearing the engine apart.
Then of you want to get more you can install a 3.29 gear ratio transaxle(diferential) and a Phase 2 Cam(I saw it on the http://www.pfyc.com site)(These 2 mods which are not exactly Bolt Ons but would take the car above ~300hp at the crank).
Pretty decen for a front wheel drive and as you can see they are not really that hard to make...

[fast98gtp]

a 3.4" pulley will give around 25-30 hp. going smaller than 3.25" will give too much KR and will result in possible loss of power--more mods will have to be done to lower the engine and incoming air temps. an intercooler will give an incredible amount of power but will require removing the supercharger and costs about 1200$. www.intense-racing.com will have many awesome upgrades for the 3800 and transaxle. Scott Cook from intense racing also has the quickest front drive late model gp in the world. 670+hp and does the quarter in [email protected] video of it racing is on the website. these people know everything about 97up gps

[wms004]

thanks for the input guys

-wade

[Ripn12s]

http://tacgp.clubgp.com/vendors.html

[kilroypr]

Ripn12s, that is an interesting list.

[Sgt 007]

These guys are exactly right. The easiest mods are freeing up the airflow. CAI, new downpipe/cat combo and cat back system. Smaller pulley is an easy boost. Get a modular pulley system in case you want to do additional mods later, and go no smaller than 3.4". If you had all the parts, you could do the everything in one days work.

[kilroypr]

sgt 007:
I got the 3.4" for standard driving and a 3.0" trasher for track days. I was told that the reprogramming on the PCM(ECU) would take care of the smaller pulley for track days and the CAI also would help on that. What you think about this?

[Ripn12s]

I think you will see massive KR when using the 3.0 pulley.

You need to get a scan tool or some sort - Autotap or LS1M

Go to the track and run that car. Try both pullies, bet you pull worse times w/ the 3.0

Just some friendly advice, dont want to see this turn into another 3 page thread about your mods and who believes you

[kilroypr]

Thanks for the advice. I do not really care who beleives or not. What I care is that people that knows what I am talking about answer intelligently my questions. Tell me then what should I have in order to be able to reap benefits from the smaller pulley?

[kilroypr]

Ripn12s, and let me tell you. With the postings on http://www.zzperformance.com, http://www.intense-racing.com among others. There is a lot of documented simple bolt ons that will take the car well above the ~300hp. And that is not me saying it(you know about this, you are verse on this kind of sites) just a bunch of mods. These are simple bolt ons but thanks anyway. Tell me what I am supposed to have in order to reduce the kr effect with the smaller pulley. MOre gas? Lower temp thermostat? Tell me

[Ripn12s]

You've seen my mod list.

I run a 3.1 as a daily driver pulley. I still see 3 deg's of KR

When at the track I run 104 octane fuel and see 0 degs of KR

From what I remember about your mod list you need to throw some more $$$ into the car before you can run that pulley. Best thing I think would be an intercooler.

Do yourself a favor and get a scan tool. That way you can actually see what the engine is doing and not have to guess.

Check this one out. Its cheaper then the atap and will do the same thing.

http://users3.ev1.net/~chauvin555/LS1M/default.htm

[kilroypr]

Is pretty neat. Good use for my PalmVx.
But the DSB9 connector won't fit on the car PCM jack. Do you have any sites for the intercooler? I just got the Trasher CAI. Does that help?

[Ripn12s]

ZZP's intercooler

http://www.zzperformance.com/zzp/pro...ntercooler.htm

MAP's Intercooler

http://www.3800performance.com/Merch...tegory_Code=EC

Thrasher's Intercooler

http://www.thrashercharged.com/store...uel_group.shtm

[kilroypr]

Since I got all trasher stuff this would be the natural choice. Question Wouldn't it raise too much the SC?