N/t

[IdealEclipse]

Is there anything i can possibly do to make my 91 GS any faster than it is other than the basics (exhaust, intake, etc.). Anybody that can help just let me know. Thanx

 

[diambo4life]

got NOS?

 

[94DSM]

Hey man there is hope! But is there money?

It all depends on how fast you want to go and how much money you got. We are both in the same boat you have a 91 GS and I have a 94 GS If my info is correct they didn't start putting the chrysler 420A's in the 2.0 GS's until 95 and that means that well the turbo motors code is 4G63T and ours is 4G63 the big difference is we have a higher compression ratio than the non Turbos ours is at 9.0 to 1 theres is I think 8.5 to 1 or something like that the lower compression allows them to run 14.6 PSI of boost where with your stock motor you could probably run only 9 Psi safely only 9 Psi would put you at between 190 -200Hp for more you would have to rebuild your motor and lower compression and while your at it you could easily build an all motor 2.0 up to 200 and it would still drive descently and be semi reliable NOS is the easy way in and the easy way out not very dependable and there is nothing like running out of NItrous at the wrong time go for something constant that would be the best way well let me know if you want more info I don't have much but I know a Little .


Tip of the day : Make sure you change your timing belt at 60k miles and be very carefull when your at the redline. learn from my $2000 mistake

 

[xhypno]

The 1g TSI and GST only had 195hp and is just faster then the 2g. but here is the good thing, the 1g is less weight the the 2g so the 25hp difference does mean much.

If you don't have alot of money, and you want the performance for a fast 1/4 mile car, Use the less lag is more method. Put a smaller turbo, at least with a smaller turbine and compressor (gets up to speed faster, hence less lag, full boost a hell of a lot earlier). with the right setup, you can be boosting 9lbs by 900rpm, compared to the slow build up of the TSI and GST. My friends 1996 GST, hits 9lbs at about 2000 rpm and then goes up to about 11lbs (the standard for all eclipse and talon 2.0l turbos, unless owner moded) by about 3000rpm.

If you compare the 1g turbo to the 2g turbo, What are the major differences?

1g turbo - biger
2g turbo - smaller

1g stock boost - 11lbs
2g stock boost - 11lbs

1g spool up point - 2100rpm
2g spool up point - 2000rpm

1g max spool point - 3300rpm
2g max spool point - 3000rpm

the smaller turbo of the 2g, allows it to spool fast (less lag), reach max faster (less lag), and produce more power in the rpm range.

The right setup in the 1g with a smaller turbo that can spool up by 1800-2000rpm and reach max by 2800-3000rpm, will be able to boost the engine up to 240hp or more, making the car lenths between them increase.

How this can help you??

Look at almost all of the piston upgrade out there for the turbo, a good portion of them bring the compression up to 9:1. With the combination of a MLS or other METAL head gasket, to deal with increased preasure, the 4G63 engine, could handle the same boost levels of the 4G63T. But I would not suggest it. The rods in the 4G63 aren't as strong as the 4G63T. But if you did push between 11psi and 14psi, the hp would exceed that of the turbo, and even better, the n/t cars are a little lighter then the turbos.

Now this doesn't mean, you can go and do this. If not done right (by a pro), you will prob. kill your engine. Be very careful even with a boost of 6-9psi, things can go very wrong if not setup right.

And remember, More air (turbo), needs more fuel. With out the right fuel system, and programming of the ecu, the engine will run very lean and that is another way to blow your head gasket, or even melt a piston (at least from high boost and enough fuel, it is really hard to do, but when your lean, your F**Ked). The right Fuel system would be new injectors, pump, and either a pro programed chip, or an air to fuel ratio computer.

So, remember more fuel is needed, and a way to manage the ratio. And that a big turbo is not always the key when trying to get fast eta's, but a turbo with as little lag as poss. will get you a higher max hp faster and lower those eta's. And if you don't beleve me, you can do the research yourself and come up with the same conclusion I have, and it is even touched on in this months Sport Compact Car. The biger turbos have more lag, giving more high end torque, and high powerband hp, while a smaller turbo will have alot less lag, alot more low end torque, and more hp where it is needed for the 1/4mile.

But now you think, what about all the import drag racers in the nhra races. they do what is called cold spooling. That is where a big turbo is used (or two) with a strong nos system, tunned and controled by a boost switch (on at no boost, to low boost, can be on until 6 - 8 psi), so when the nos spools up the turbo super fast, it shuts off and lets the turbo take over. I am not even going to try and go into why it works, that would require a long physics lesson about the relationship of preasure and tempature when regarded to kenetic energy, and I don't have the time for that right now, mabye some other time, if enough of you want to hear it.

So be wise and do what you can, with the money you have, and get it done by a pro or some one who really knows what the are doing, and knows how the set a afc or program an ecu, to retard the timing right, or there goes your pistons, rods, crank, and your valves.

Peace
xhypno