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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 02-19-2013, 12:06 AM   #71
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I've been running my turbo on my car for a few days now and i can say without a doubt that with my limited time driving it my average MPG has dropped quite a bit. With all my mods before turbo I averaged 24-25MPG, now I'm averaging 20-21MPG. When I am burying my foot in the throttle and playing the car is even worse. I will be taking a trip from Phoenix to San Diego soon which is all open highway to get a good estimate of highway MPG, I'm expecting relatively similar numbers to what I was getting before at about 28-30MPG, but we'll see.

I can attest to the expense of a turbo setup, a turbo kit might cost $4-5k but that doesn't include all the other things you should upgrade with a turbo, like wheels, tires, clutch, exhaust, tune, gauges, etc. I have about $20k invested in parts in my car and most of it is performance oriented.

You also do add weight...in my case about 50lbs was added to the front end, but with 7PSI boost I'm making 255WHP, almost 100HP over stock, so the weight gain is hardly an issue. You can get rid of that added weight by changing out your stock flywheel, taking out your spare tire and all the res of the stuff in the trunk, and a few other minor weight reducing options if it's that important to you.

Last but not least, these turbo kit's do not lose responsiveness of the throttle, in fact with a lightweight pulley and clutch/flywheel installed my car revs like a sportbike...if you don't believe me:



These little FA20 engines are built for boost it seems, hell they even include bungs on the engine case for oil supply lines. It's been a long expensive journey, but if you are considering a turbo, you have to weigh all the good with all the bad. If MPG is a big factor FI might not be for you, hell any engine modification beyond a tune would probably be a bad idea if MPG is the net goal. If you are looking for more performance and can live with slightly worse MPG then FI is a viable route.
I feel sorry for your engine reving past 7k with boost. But sounds cool!
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Old 02-19-2013, 12:15 AM   #72
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I feel sorry for your engine reving past 7k with boost. But sounds cool!
they have at least one car running to 10k, and numerous others between 8500 and 9k.. but i am letting them guys test out the durability for me lol
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Old 02-19-2013, 01:09 AM   #73
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they have at least one car running to 10k, and numerous others between 8500 and 9k.. but i am letting them guys test out the durability for me lol
Lol
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Old 02-19-2013, 01:15 AM   #74
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7k is hardly anything
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Old 02-19-2013, 01:27 AM   #75
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7k is hardly anything
Lol? For a Boxer it is.
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Old 02-19-2013, 09:23 AM   #76
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Lol? For a Boxer it is.
O RLY

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Old 02-19-2013, 11:00 AM   #77
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O RLY

I bet this 8.5-9k redline would sound FANTASTIC.
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Old 02-19-2013, 03:03 PM   #78
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Lol? For a Boxer it is.
YA RLY 991 GT3:

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Old 02-19-2013, 10:41 PM   #79
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That's a porche ahahaha. We are talking a Subaru boxer here that's N/a. You do understand how much that GT3 engine cost right? I guess I should have been more specific.
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Old 02-20-2013, 09:56 AM   #80
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That's a porche ahahaha. We are talking a Subaru boxer here that's N/a. You do understand how much that GT3 engine cost right? I guess I should have been more specific.
You do know our Subaru boxer is "N/a" right. Our FA20 is a 2.0L with 4 cylinders and direct injection. It is not your standard Subaru EJ boxer engine. That 991 GT3 engine is most likely a 3.8L 6 cylinder with direct injection. It has more valvetrain parts and weight and can still rev to 9000 RPM. Your point about boxers not reving is invalid. I don't see how the price of an engine is valid in this conversation.
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Old 02-20-2013, 12:46 PM   #81
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The 1776 out of my 66 beetle revs to 7200... That's an old ass design..
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Old 02-28-2013, 09:26 AM   #82
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more boost and stock redline if you're at all MPG aware, pissing fuel is fast at higher revs is easy

not trying to win races so why beat up the motor at 8000k+?

blast to factory redline faster, perfect, and if I take my time and can rev it lower overall with more HP and TQ, that will be as MPG gentle as it gets, and long life friendly

not sold that subaru boxer valve train @9k revs = porsche's, that IS why one costs more
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Old 02-28-2013, 12:12 PM   #83
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I would just like to say that if I slap a turbo running ~10psi on to this car, I will be happy seeing even 22-24 mpg which would still be better than my '09 preza.
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Old 03-07-2013, 08:52 AM   #84
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I would just like to say that if I slap a turbo running ~10psi on to this car, I will be happy seeing even 22-24 mpg which would still be better than my '09 preza.
When I drive like I belong behind bars I'm getting 23-24mpg, but thats keeping her floored and driving maniacally...you have to WORK to get the MPG that low with my setup.
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