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Underbody braces, turbos and more!

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PostPosted: Tue Apr 01, 2008 10:50 am 
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I am about to put the bumpers, sideskirts, and mirrors from a 91 swift gti on my 91 metro vert, I was wondering if these mods would decrease my MPG or stay the same.. I will be keeping the 1liter engine & trans

I am currently getting 50mpg if I stay within 55-60mph, or 45mpg if I do 60-70mph.

Here is how I want it to look like after the kit transfer & current picture of my car.

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PostPosted: Tue Apr 01, 2008 7:43 pm 
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any advice? or should I just put on the stuff, and do a test run, and see difference.

I am thinking the GTi parts would add more air resistance. I dont really want my MPG to go down much, but I really like the Gti look.

Such as:

Bigger side mirrors ( more air resistance)
Bigger area of the front bumper
Side skirts probably wont have any affect.
Front grille may push more air under hood or cool engine more.
Alloy rims, probably are lighter, but wont be smooth like stock wheels with hubcaps.

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PostPosted: Fri Apr 04, 2008 6:14 am 
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mpmetro wrote:
Bigger side mirrors ( more air resistance)


True The stock vert mirrors are more aero.

Quote:
Bigger area of the front bumper


The overall shape of the GT bumper is more aero than the stock vert bumper. Coyote X did coastdown testing comparing bumper styles, and the more "bluff" version was better.

But as you already mentioned, the massive grille openings in the GT bumper will increase drag. You'll see an improvement in MPG if you block most of them. Possibly a net improvement over the stock bumper.

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PostPosted: Fri Apr 04, 2008 11:36 am 
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thanks for the reply geometro, I dont really care for improvement right now.. I just hope mpg doesnt get worse.

do you think it will get worse? or stay the same.

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PostPosted: Fri Apr 04, 2008 11:43 am 
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It'll get marginally worse, but the difference will be small enough that you probably won't be able to see it outside of the normal variation you see from fill up to fill up.

Of course, your odometer may be messed too if the tire OD is bigger from stock. That alone will mess up your "apparent" mpg even if you change nothing else (because the car will appear to be going a shorter distance on a given amount of gas).

EDIT: why not partially block the GT grille openings though? It's free money!

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PostPosted: Fri Apr 04, 2008 11:56 am 
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but blocking the gti grille will defeat the purpose of putting it on there, "the looks"

Unless I can put something to block the grille from behind it, under the hood, so that it appears stock from outside.

Or maybe I can put a smooth black piece infront of the grille area instead of the crisscross mesh that is in the grille.

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PostPosted: Fri Apr 04, 2008 12:06 pm 
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If you cut and stick some black plastic behind the mesh, you'll gain most of the benefit of making a smooth block on the front surface of the bumper.

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PostPosted: Fri Apr 04, 2008 12:17 pm 
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geometro wrote:
If you cut and stick some black plastic behind the mesh, you'll gain most of the benefit of making a smooth block on the front surface of the bumper.



Thanks, that is what I will do.

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PostPosted: Fri Apr 04, 2008 12:27 pm 
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Keep an eye on your temp gauge and an ear out for your rad fan. (I see you're in TX.)

FYI, I've had approx. 24 square inches of open grille directly ahead of the radiator (plus the gap between the hood/bumper) for about 2 years now. The car doesn't run hotter than normal:


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bra-grille-block-z.jpg [ 93.39 KIB | Viewed 711 times ]

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PostPosted: Fri Apr 04, 2008 1:02 pm 
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you were talking about that little grille on top that I was going to block right? or the big one at the bottom.

Because I think the big one at the bottom is about the same size as the stock vert one. So I think I will leave that as it is, since I get good mpg even with that stock.

By blocking the grille, are you saying it will help aerodynamically, or make the engine run hotter, for better fuel consumption? or both? but I guess in texas its hot all the time. My temp gauge stays at the middle point while driving, and comes a little higher than middle when at long stops.

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PostPosted: Fri Apr 04, 2008 1:14 pm 
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If it were mine, I'd block all of the little one at the top, and most of the one on the bottom, except directly in front of the radiator.

Grille blocking has 2 benefits: It helps the engine reach operating temps sooner, and it's an aerodynamic improvement.

Also, I don't let my engine idle at long stops ;)

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PostPosted: Sat Apr 05, 2008 12:22 pm 
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what year suzuki has this bumper? and would it fit on a 95 metro sedan?


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PostPosted: Sat Apr 05, 2008 12:32 pm 
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demonchild wrote:
what year suzuki has this bumper? and would it fit on a 95 metro sedan?


I think the mk2 (89-91) swifts have it, maybe also mk3 (92-94).. I am getting mine from a 91 swift gti. It would not fit on a 95, because thats when they switch over to a totally different body style.

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PostPosted: Sat Apr 05, 2008 8:04 pm 
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mpmetro wrote:
you were talking about that little grille on top that I was going to block right? or the big one at the bottom.

Because I think the big one at the bottom is about the same size as the stock vert one. So I think I will leave that as it is, since I get good mpg even with that stock.

By blocking the grille, are you saying it will help aerodynamically, or make the engine run hotter, for better fuel consumption? or both? but I guess in texas its hot all the time. My temp gauge stays at the middle point while driving, and comes a little higher than middle when at long stops.

the cooler the engine the better the air fuel mix ratio thus better running motor
why do you think they make cold air intakes and not hot?


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PostPosted: Sat Apr 05, 2008 8:17 pm 
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There's a difference between intake air temp and coolant temp.

You want coolant temps to get to normal operating as quickly as possible for maximum efficiency. The engine computer enriches the a/f mixture until the engine has warmed up.

It's why block heaters improve MPG.

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