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Old 08-02-2013, 09:30 PM   #1
Jr_gosetto
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Default 91 octane OS tune??

The title kind of speaks for its self.

The question is can u tune a 05 RS to run on 91 octane with just an OS tune
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Old 08-02-2013, 11:36 PM   #2
02nismokiller
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You can tune your stock rs to run on even race gas with opensource lol
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Old 08-03-2013, 11:25 AM   #3
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Quote:
Originally Posted by 02nismokiller View Post
You can tune your stock rs to run on even race gas with opensource lol
That is soooo sweeeet thanks for the info 02nismokiller I have always wondered y subaru designed a hicomp engine to only run on 87 my dads 300 has 10:1 CR and it runs 91 yet the RS has 10:1 CR (atleast from what I've heard) and it should run 87?? A little weird of u ask me plus I am thinking of heads and ej257 headgasket (i hear these HG last much longer then HG) for my car and feel 91 would would make the power I'd be happy with
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Old 08-06-2013, 11:09 PM   #4
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Originally Posted by Jr_gosetto View Post

That is soooo sweeeet thanks for the info 02nismokiller I have always wondered y subaru designed a hicomp engine to only run on 87 my dads 300 has 10:1 CR and it runs 91 yet the RS has 10:1 CR (atleast from what I've heard) and it should run 87?? A little weird of u ask me plus I am thinking of heads and ej257 headgasket (i hear these HG last much longer then HG) for my car and feel 91 would would make the power I'd be happy with
There is far more to octane requirements than CR. Also if changing heads/headgaskets you may want to make sure the combustion chamber and gasket thickness are the same. This also changes cr and potentially fueling requirements.
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Old 08-07-2013, 05:46 PM   #5
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But being that the factory tuned it for only 87 says that there's alot still left on the table.
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Old 08-07-2013, 07:58 PM   #6
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But being that the factory tuned it for only 87 says that there's alot still left on the table.
I would say it's negligible, not a lot.
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Old 08-09-2013, 09:56 AM   #7
Jr_gosetto
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How about if I thru one a throttle body that flows 70.8 cfm better then stock
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Old 08-12-2013, 12:53 PM   #8
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would the throttle body with its added cfm and a 91 octane tune add 10% hp (I only say 10% bc the rule of thumb is you will only feel a hp increase if its 10% or more)
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Old 08-12-2013, 11:52 PM   #9
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Originally Posted by Jr_gosetto View Post
would the throttle body with its added cfm and a 91 octane tune add 10% hp (I only say 10% bc the rule of thumb is you will only feel a hp increase if its 10% or more)
The throttle body doesn't add airflow to the engine. It adds airflow CAPACITY. Your stock TB is likely more than capable of outflowing the air consumption requirements of your engine.
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Old 08-13-2013, 03:28 PM   #10
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The throttle body doesn't add airflow to the engine. It adds airflow CAPACITY. Your stock TB is likely more than capable of outflowing the air consumption requirements of your engine.
Well in all honesty first thats a little oxymoronic (bc u said it wont add airflow it adds airflow capacity) i understand what your aiming to say tho and then y do people even try with short ram intakes they aim for the same thing more air/colder air but they actually make the air warmer bc it removes the filter shield and the snorkel (witch is normaly closer to the front grabbing cooler air) I'm not trying to say CAI are a smart thing to buy I'm just saying i think if tuned right I'm sure it will add some power
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Old 08-13-2013, 06:12 PM   #11
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It's not oxymoronic at all. Opening up the throttle body will allow for more air flow at that one point, but until it becomes a restriction, the flow won't be increased.

One thing it will cause though, is a loss in throttle resolution.
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Old 08-13-2013, 07:40 PM   #12
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It's not oxymoronic at all. Opening up the throttle body will allow for more air flow at that one point, but until it becomes a restriction, the flow won't be increased.

One thing it will cause though, is a loss in throttle resolution.
If u would of said it won't increase airflow only air capacity I would agree u Weren't oxymoronic, but since u said it won't increase airflow but will increase airflow capacity it's technically oxymoronic, bc your saying airflow won't increase then you say airflow capacity will increase. It's like trying to define a word and using the same word in the definition. i'm putting English aside now.

I do appreciate the response tho and wen you say throttle resolution do u meen throttle response. And if your saying it won't increase the overall performance bc it won't use the extra cfm how would it create a bad "throttle resolution"
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Old 08-13-2013, 08:30 PM   #13
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Originally Posted by Jr_gosetto View Post

If u would of said it won't increase airflow only air capacity I would agree u Weren't oxymoronic, but since u said it won't increase airflow but will increase airflow capacity it's technically oxymoronic, bc your saying airflow won't increase then you say airflow capacity will increase. It's like trying to define a word and using the same word in the definition. i'm putting English aside now.

I do appreciate the response tho and wen you say throttle resolution do u meen throttle response. And if your saying it won't increase the overall performance bc it won't use the extra cfm how would it create a bad "throttle resolution"
All you need to know is what you're thinking is worth the money, isn't.

Make the car louder. You'll think its quicker. Get a tune. It can make it seem faster to due to throttle sensitivity and response, and get you better mpg and a few negligible hp on an na car.

Other than this you are wasting money and time. I'm being honest. Na cars without serious mods won't add hp enough to make a difference.
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Old 08-13-2013, 10:58 PM   #14
Black94Snake
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Originally Posted by Jr_gosetto View Post

I do appreciate the response tho and wen you say throttle resolution do u meen throttle response. And if your saying it won't increase the overall performance bc it won't use the extra cfm how would it create a bad "throttle resolution"
The TB is a valve. It flows XYZ g/s amount of air at 28"hg.
Your engine only produces a maximum airflow of xxx g/s.

XYZ-xxx is an efficientcy loss. The larger the TB bore is, the more it is capable of allowing to flow (i.e. capacity). If your stock TB can flow xxx (your engines peak air intake volume) when your TB is 90% open, and you increase the size of your TB bore by installing a new piece. Your engine will now reach peak air intake at a lower TB opening percentage. Therefore, you increase the amount of "dead space" towards the higher end of the TB opening percentage.


You effectively reduce the available useful range of throttle resolution.
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Old 08-14-2013, 09:15 AM   #15
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But then again I guess I should also state that this is a first of the mods I'm planing I have thrown up a thread in the built motor discussion threads about the mods I'm planing it's going to get the TWE stage || head package and possibly there 11.2:1cr pistons so when I put up the 91 octane tune post I was mainly woundering on the possibility of putting the throttle body on first before I do the heads and pistons and everyone says ill waste money but I have $ to spare I make over 250$ a day take home and I'm only 20 I appreciate the replies it is great to know if ill be going in the right direction or back tracking on the stock engine TWE has 2 options if throttle body improvements one gains about 40 cfm for about 200 and the other takes it to 78.8 cfm for 500
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Old 08-14-2013, 03:24 PM   #16
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I make over 250$ a day take home and I'm only 20
Well, you clearly have a bigger e-peen than I do. So, enjoy wasting your money I guess.



Don't bother taking advise from people who have been doing this stuff for longer than the majority of your life, as we clearly don't have a clue. Better yet, why bother asking if you are going to ignore the answer.
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Old 08-14-2013, 06:13 PM   #17
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Well, you clearly have a bigger e-peen than I do. So, enjoy wasting your money I guess.

Don't bother taking advise from people who have been doing this stuff for longer than the majority of your life, as we clearly don't have a clue. Better yet, why bother asking if you are going to ignore the answer.
In all honesty I'm not putting on just the throttle body now, bc of everyone's post bc this forum has been helpful. I can understand y people do the swaps but Its not for me. I now realize I have probly frustrated the hell out of you guys and I do apologize. I understand we kids can be quite irritating and hard headed. And I know 20 years old sounds like I should know nothing but I have been working with engines and mechanical things in general since I was able to hold a screw driver so I have probly around 10 years of general knowledge of engines how then work and at wat point things won't work (my 50year old father comes to me for cars) I'm not new to engines. But I have only looked at H4s never had the time to get into one. So yes u guys have more subie experience and this is y I am posting. to get all the info I can so I know wat I'm getting into. at no point am I saying u guys are wrong or I'm not taking your advise. I just want to know if I'm going the right way or not and if people ask I can properly answer with facts. I want to start gaining the knowlage that the people on this forum have but don't want people to think I'm not%
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Old 08-14-2013, 06:15 PM   #18
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Competent. like I said I'm sorry for rubbing anyone the wrong way didnt mean to and apologize if I did
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Old 08-15-2013, 07:55 PM   #19
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Competent. like I said I'm sorry for rubbing anyone the wrong way didnt mean to and apologize if I did
Best bet for not wasting money is find somebody that hit a hp number (or specific ET or trap speed). Ask how they did it. Ask which way they would go if they did it all over again. Then find another and repeat. Then repeat that a few more times. Then you'll at least have a path to take.

You can also find out which big modifications you are going to want to do. Look up people that did them and find out the supporting modifications needed to do it. Then go that route.

Just looking at single things like a TB is pointless because it's a supporting modification. Not something you just do.
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Old 08-15-2013, 11:32 PM   #20
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Wow I feel super retarted now y didnt I think of that thanks fr the reply I have just got m first reply for the guys at TWE so I'm going to also pick there brains and c wat they think

Cheers guys me and my wallet thank u for not jumping in to quickly
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