[grandtour91]

does anyone know exactly how fast it is? i hear its a drop in for egt´s but some ecu reprogramming is need it.is the gtr engine the same but faster?
I havent done any major mods to my engine other than plugs and wires,so i´m thinking about saving some money to get a gtx engine,then i will add the intake,header,and exhaust.

 

[TheBlade]

You wouldn´t say the engine is "faster," you would acknowlege it has more power....so your question is "how much more power does it have?"

Well, the first understanding is the GTX/R are turbocharged motors. Its the turbo that helps produce more power.

The GT 1.8L motor is spec´d at like 127bHP So its like right around 100 horse to the ground.

The GTX motor is basically the GT motor with a 3XXcc injector instead of the 2XXcc injector. Also, the GTX motors use bigger fuel pumps. So aside from the fuel system, the turbo...the biggest difference is the ECU. The ECU is designed to raise the fuel pressure in proportion to boost, and it retards the timing with boost too.

I know one of the things 323 GTX owners complain about with that ECU is it has a nasty habit of going lean at 10lbs of boost.

I think the GTX motor on stock boost is said to produce about 185 horse. Obviously uping the boost will increase power.

With all the peeps I´ve talked to and all the number crunching I´ve done, a 1.8L motor with a 3.35" bore and 3.27" stroke (I may have the two number´s mixed up, but do realize I´ve been bar hopping all night) using a turbo efficiency of 60% and an intercooler efficiency of 75% at 10lbs of boost can put about 215-225 HP to the ground.

But remember to push that much boost You´ll need either a GTX motor, or your GT motor with an upgraded fuel system.

The GTR is the only really different engine...I can´t seem to find alot of info on it, but I´m pretty sure the pistons themselves are different (dished I think), and the rings are better. I´ve heard the head gasket is better and stuff...hard to find info if you know what I mean. Anyhow, the GTR is like 210 horse on stock boost. Doesn´t really matter, your chances of even finding one are pretty much NILL.

Anyhow, how fast can you go? Now lets assume you´re going my route and doing a GTX setup on a GT motor. Lets assume nothing goes wrong and you run 12psi for one pass down the track. Well your scort is something like 2600lbs with fluids and 12psi is like 230-250 horse. Thats like a weight to power ratio of 10.5:1 ...9:1 would be AWESOME, 8:1 is like a supercar status. My guess is with 10.5:1 weight to power ratio and a perfect reaction time with lots of traction somewhere in the 14´s is possible.

 

[TheBlade]

Almost forgot....you cant really put a header on the GTX/R motor because the manfold is so tight to fit the turbo. Likewise with intake... lets say you spent 150 bucks on some conical intake and everything, you´re still just hoping to reach perfect vacuum faster...with a turbo the vacuum will be crazy.

If you want to save some money but get some performance....here´s my recommendation.
1. Cut your airbox. Pull your airbox out completely and use a dremmel and cut right below the filter. I noticed a huge increase in low end response from it.

2. Put the K&N filter in. It does flow better then a paper one, even though it might not be conical...you can clean it. It saves money in the long run when you consider buying new paper ones. And the cool whizzing sound you can´t go without.

3. 2.25" Exhaust. This helped me the most. If you have a turbo I would recommend 2.5" Right now I´m 2.25" header to the rear axle and 2.5" axle back through duel inline mufflers. :Warning: its F%$#ing LOUD, but I did notice a big increase in power. I also found when I´m on the highway at 4k Revs I can get almost 40MPG...and that saves alot on the pocket.

I advanced the timing a little, until I get the turbo in. Even with the heavier 17" rims at sea level I can kick the crap out of most V6´s and even Expeditions and Excusions with the 351 or 460 V8´s. The new Merc Cougar V6´s are a joke and a whole lot of fun to go fly´n by.

Up here at 5500´ over sea level I can even hang with my roommates turbo civic until he hits high revs.

 

[grandtour91]

thanx for taking the time to write. your information has been very helpful. basically you are saying that you cant add a header and intake to a gtx,because of the turbo. that´s cool cause then i´ll have money for the 2.5 exhaust! will i need a stand alone ecu?

 

[TheBlade]

Well Intake is a good thing...but I´m really happy with my make-shift intake over spending alot of cash.

The aftermarket header I bought...I was disappointed with. I say..the stock one isn´t that bad really. And if you plan to go turbo...you´d have to ditch it anyhow.
:However: you can have a header and a turbo... my roommate has one on his civic, but they are a custom job that´s not worth the cash.

If you plan to go turbo, you can either get the GTX ECU (not cheap), but it will support the higher fuel rate and timing control.

OR:

You can get aftermarket stand alone systems. fuel (like Apex´i S-AFC), and Boost Timing Master from MSD.

Going with the aftermarket goodies are expensive, but if you want superb performance (or just want to impress people with lights and gadgets) Its a good set up. You can tweak everything just the way you want it. I guess the ultimate way to go is a Programmable ECU ...but that´s if you have 1400 bucks laying around.