Need some opinions

[CamaroKiller]

So here's the deal my head gasket went out so I pulled the head and am replacing the gasket. The car is a 98 Eclipse GST with 80,000 miles and is my daily driver, but with the head already off getting to the turbo is so much easier. I was thinking of upgrading to a 16g. The only mods the car currently has is a Greddy type-s BOV and a FMIC, which is how I bought the car. Do you guys think I should just go ahead and upgrade or leave the t25 in. The t25 has 0 shaft play. Oh, and what other supporting mods would I need if I upgraded to a 16g? I would like to keep the gas mileage and reliability as good as possible since I drive it 120 miles roundtrip to work everyday. Well let me know what you think.

Thanks,
Seth

 

[outkastracing]

yes you will love it compaired to that turbo also while your there replace the timing belt and tensioner...

 

[dsmdragon]

well I'd say keep the t25 if you are just running around and want the milage. The 16g will give you more HP that's a given. But you would either loss mpg or have to upgrade the fuel system on the car if you want high enough boost. If you have the head already off you should upgrade the valves - retainers - and most importantly the springs on the head... You have it off so work on that right now not the turbo.

 

[Mikael SS]

why would he mess with the springs and retainers? he never said he wanted to increase the redline. the money would be better spent elsewhere.

Most people gain hp with a 16g, not lose hp, even without touching the fuel system.

 

[CamaroKiller]

Yeah, I'm replacing the timing belt, tensioner, water pump, accessory belts, plugs, wires, valve cover gasket and whatever I could find that would be easier to take care of now. I figured if I upgraded to the 16g I would have to get a new fuel pump and improve the wiring to it. I wasn't planning on replacing the injectors. How much do you guys think upgrading to a 16g will effect my mpg?

 

[dsmdragon]

why would he mess with the springs and retainers? he never said he wanted to increase the redline. the money would be better spent elsewhere.

Most people gain hp with a 16g, not lose hp, even without touching the fuel system.

Yeah but he wants good mpg and wants to replace anything will the headds out. WHY NOT replace something that's going to wear out in another 20 to 30 thousand anyway. Just more money to replace the new parts he put on now again. If he can get both ,then more power to him. But if he wants the same mpg he might think twice on te 16g. and might want to replace the springs that could be going out. And alloy retainers let you rev faster anyway.

 

[silverbullett]

My mileage stayed the same with my 16g. I can still get 25+ on the freeway if I stay out of boost. Gas mileage depends on how heavy your foot is, plain and simple. The only fuel mod I've done so far is a fuel pump rewire though. I'm sure if I upgraded my injectors and fuel pump, my mileage would most likely go through the floor.

 

[fwspin]

Bigger turbo=more boost you'll want to run= more hp=equals you wanting to boost more= more fuel consumption. Maybe my math is a little off here. just my .02

 

[silverbullett]

This is why I bought an electronic boost controller. When I'm cruising, I have it set at 10psi max. At that setting I get great mileage. At the push of a button, I give myself an extra 5psi and gas mileage goes down the drain but, I'm okay with that. You gotta pay to play. In this case it's at the pump. That's the beauty of a turbo car, mileage when you want it, horsepower when you don't care.

 

[turboglenn]

Just get the bigger turbo, you'll want one at some point anyway. As for gas mileage, 90% of that is controlled by how heavy your right foot is. While cruising the economy will be the same, it will only use more fuel when boosting enough to move more air than you do already with the t-25. So as long as you have enough self control to keep the boost down until you buy a fuel pump you'll be fine. After the pump you'll only need to upgrade injectors and get an AFC to take full advantage of the 16G, but will be fine without them until you're maxing out the stock fuel system with a new pump ( oh an don't forget to re-wire the pump according to the vfaq on it to further improve fuel flow)


There's a million and 1 theories on fuel economy and turbo size, but you shouldn't notice hardly any difference between a t-25 and 16g as far as that goes. One theory would say that since the 16g spools slower, it will take longer to make boost and there-for move less air at lower RPMs and low throttle driving which would improve mileage.

Either way you won't regret upgrading!

 

[ldrgst]

definatley upgrade .


"WHY NOT replace something that's going to wear out in another 20 to 30 thousand anyway."
agreed.

 

[Artago]

Just get the bigger turbo, you'll want one at some point anyway. As for gas mileage, 90% of that is controlled by how heavy your right foot is. While cruising the economy will be the same, it will only use more fuel when boosting enough to move more air than you do already with the t-25. So as long as you have enough self control to keep the boost down until you buy a fuel pump you'll be fine. After the pump you'll only need to upgrade injectors and get an AFC to take full advantage of the 16G, but will be fine without them until you're maxing out the stock fuel system with a new pump ( oh an don't forget to re-wire the pump according to the vfaq on it to further improve fuel flow)


There's a million and 1 theories on fuel economy and turbo size, but you shouldn't notice hardly any difference between a t-25 and 16g as far as that goes. One theory would say that since the 16g spools slower, it will take longer to make boost and there-for move less air at lower RPMs and low throttle driving which would improve mileage.

Either way you won't regret upgrading!

X2. Get the E316G and a MBC and keep the boost settings low (12-14 PSi or so). Rewire the fuel pump and slowly turn up the boost (don't go over 15 PSI). Then, when you get the $$$, upgrade the fuel pump, injectors and get an AFC and a logger tune the car and CRANK up the boost and have fun.