1998 Gsx

[lucid15]

My friend is looking to further upgrade his 1998 GSX. He already has the following mods:
Aftermarket BOV
PIAA Rims
2.5" Catback
Downpipe
Boost controller 14PSI max
Intake (k&N)
He wants it only for the street and not the track, its a daily driver. Which mod should he purchase next? His goal is around at least 300WHP.
Any help is appreciated.

 

[viperlp01]

Well 300 hp will require at least a 16g turbo, 550 or bigger fuel injectors, a bigger fuel pump, a tuning device or two, gauges that mean something, and around 25 psi... So that would mean you might want a fmic to cool down that air. YOu might as well port your manifold and o2 housing.

 

[lucid15]

So the 16g turbo would be the next purchase? can the car handle just adding in the 16g?

 

[xioca]

You'd have to keep the boost low until you get the supporting fuel mods and tuning equipment.

 

[xdxoxuxgx]

300 HP is easily attainable before 25 psi with the right combination of mods and proper tuning. I would agree with upgrading to a 16g, with proper supporting fuel mods: (larger injectors and pump), a tuning and logging device, and gauges (02 Wideband and aftermarket boost) to see what's going on.

 

[viperlp01]

Maybe 13lbs with stock fuel. I would upgrade fuel first then add 16g. Fuel is always better. I run 680cc(100 bucks used), wally 190lph(35 bucks), maf-t(120 with everything), sockets and chipped ecu(40 bucks... had my buddy write me a no fuel cut code and some other goodies), FMIC(280 shipped), ebay 16g( I went through SSAC and got mine for 250 with everything needed for install... 10k miles and zero shaft play).I got a megan downpipe for 90 shipped off this site and an apexi n1 catback 1k miles old for 100 bucks and had a wideband bung and the dp extended so it will match up with the n1 for 30 bucks.So i spent about 1000 dollars for all of that... Alittle more money in gauges and datalogger

25 psi is going to be needed. The EVO comes from the factory at what 19 lbs and they have 250-260 whp... He will need 25 on stock block and minimal tuning tools.

 

[crimsondragon]

Tech Guide: 2G 4G63t Upgrades: Stage 1 Power - DSMtuners

 

[blacksheep86]

EVO 8 injectors and fuel pump can be had for $120.00 give or take. I would get at least an egt gauge if not a wideband and then and 16g and something to tune it with.

 

[marshall13]

Now that you know you need fuel mods to support that turbo, here's a quick breakdown of what all you would need for that 300hp range.

-At least a 190lph fuel pump
-500cc injectors or better ( I would go a little bigger just to make sure you are not pushing them at full duty cycle all the time)
-While you don't have to use the AFPR with a 190lph fuel pump, I would reccomend getting one anyway just to be on the safe side.
-A boost controller that will let you go past 14psi
-FMIC and piping

That's all I can think of right off the top of my head. Anybody else think of something I might have missed?

 

[xdxoxuxgx]

25 psi is pushing it on a stock block unless you have a good tune. EvoIII 16gs are 10-12 psi on the stock wastegate.

 

[viperlp01]

Well considering i mentioned all that... No .. I guess i missed the MBC which i made for free... i work at a hardware store.

 

[viperlp01]

25 is needed for 300hp..... Reliable or not. I would say the tuning devices would let him know if the bock can take it. If he doesn't see knock and he runs high octane and a FMIC i dont see a problem with a 16g at that level. Im going to be pushing 23 pounds shortly and ill let you know my egts.

SOrry for the double post i know its a no no

 

[marshall13]

Eh, I missed the A/F guage, wideband, and logger so I guess you still did better than me.

 

[xdxoxuxgx]

Viper, I don't want to get into a debate with you, but 25psi is unnecessary overkill on an EvoIII 16g when the goal is only a 300HP street car, especially on the stock motor. 15psi would do fine on a 16g, and even taking it up to 20psi (given proper fuel mods and tuning) would be a sure 300HP.

 

[marshall13]

I can attest to that. The owner of my car before me had it dynoed at Abel Racing in MWC at 330hp at 30psi on E85 with a 16g so 25 should definitely get you covered but then it might be beneficial to maybe invest in a water/meth kit to help with the detonation that will most likely happen with pump gas.

 

[crimsondragon]

If you are suggesting anything over 20 psi, be sure to include ARP headstuds. Lest he blows a HG.

 

[jrohner]

25 psi is going to be needed. The EVO comes from the factory at what 19 lbs and they have 250-260 whp... He will need 25 on stock block and minimal tuning tools.

Boost PSI doesn't mean much from car to car. Actually, evo's have around 19 on the low end and only 16psi on top end. So 16psi at 250hp is more like it for them. Plus they have a fairly crappy tune stock, which hurts them quite a bit. A more efficient tune matters a lot, not just how much boost you're running.

When I still had a tiny sidemount intercooler and stock cams, I had 340whp at around 24 psi. Now with cams and a FMIC, I'm at 414 at around 22-23psi. So, you can't say someone will have a certain amount of power at a certain boost pressure. It's about airflow and an efficient tune and setup, not boost pressure itself.

I would definitely recommend getting a better fuel supply (injectors and fuel pump) and something to tune with before getting a bigger turbo. You can more than max out the stock tune on a stock turbo anyways. I would suggest an EPROM ECU for fuel management; a simple yet very effective tuning solution with tunerpro and a chip burner or emulator. Tunerpro is easier to tune with than a stupid AFC anyways.

Once he gets the supporting mods, 300awhp will be easy to get out of a 16g; I would think even a 14b could do 300.

 

[Defiant]

Did the "How Do I Upgrade?" boat just debark?