Bolt On Si -- no tuning vs tuning comparison

mr_guitar3825 said:
Ok, I don't really get how the k&n could hurt the power. The stock air collector still brings cooler air up to the k&n filter which is larger and the pipe leading to the TB is slight straighter and larger. I have a 14si so it might be different for me but I felt I had a little better throttle response. I do not have a tune. Could someone tell how it is worse? I can understand minimal gains or none. But worse? Something doesn't add up
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My HFP felt way more responsive when i ended up removing it to sell the car... it was the only bolton i add w/ stock tune.
 
webby said:
You can hit 230's-240's wheel horsepower with bolt on mods. That's without cams.

Intake
Exhaust
Downpipe
Rbc intake manifold
Zdx throttle body
Flashpro/tune
/230-240's to the wheels
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Don't they say the rbc intake does nothing aswell? Nor the zdx throttle body?...
 
I'll be ordering my u-tune here shortly. I am running skunk 2 cai, p2r tbs, invidia N1 catback , and full race downpipe. What kind of power should I expect to gain with this tune. I really hope skunk 2 did a good job with that cai
 
Kevv_Si said:
Don't they say the rbc intake does nothing aswell? Nor the zdx throttle body?...
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RBC sacrifices torque in the mid-range for hp in the upper range. ZDX provides a bit more hp in the upper range.

If you are staying NA, don't install an RBC. If you are going FI, install one.
 
Kevv_Si said:
I'll be ordering my u-tune here shortly. I am running skunk 2 cai, p2r tbs, invidia N1 catback , and full race downpipe. What kind of power should I expect to gain with this tune. I really hope skunk 2 did a good job with that cai
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Vit says usually 200ish to the wheels. For comparison, stock is in the 165-170 range to the wheels.
 
squiggy said:
Vit says usually 200ish to the wheels. For comparison, stock is in the 165-170 range to the wheels.
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That is extremely tempting.:woowoo:
 
He posted a new rbc dyno on that thread without any losses that I see. It's all gains despite him saying in the other thread that you'd lose hp/tq w/rbc setup. I quoted it asking for an explanation without a response
 
Why must bolt ons on our cars be soo difficult. /buys prl turbo kit
 
I chimed in on the rbc debate. The best i can tell from looking at the graphs is no loss. The one that he posted claiming loss of power was unusual.
 
Caestus75 said:
Please forgive my ignorance on this. I am still learning. Doesn't your ECU learn how you drive? I think people don't see any gains because they are bolting on to an engine that was driven a certain way etc. and needs to re learn the new parts. The ECU learns air inlet and fuel inlet (not how high you rev the engine etc or how hard you drive it) but there are some direct connections.

Why does K&N Guarantee 10-14 HP on their intake or they let you keep it for free? They do make you pre dyno and post dyno and that could defer some people but really seems like a stretch as they could be sued for false advertising and that would be a bigger issue.

I think if you bolt on a engine that has 20,000+ Miles your ECU will take far longer to re learn air flow etc. That is why you get misfires etc. I bolted on my K&N intake at 2200 miles and left the battery unplugged for a day. The biggest difference I feel is a much more throaty exhaust that is otherwise stock. But there could be more power.

There are also ways to manipulate your ECU without actually "tuning" it. You can have your cooling fans on all the time and by default helps the engine run cooler. There are other "tuning" things you can do without flashing your ECU if I am not mistaken.

Granted I understand that flashpro is great (at least what I've read) and I may eventually buy a flash for my car and a tune... but isn't that why we don't see bolt ons have bigger yields? Granted I have read a ton that most short rams and even CAI do nothing for performance.... which makes me wonder why is there such a huge market for them if they do nothing?
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Have you checked out Vitviper's blog?
He has lots and lots of useful information and would most likely answer the questions that you have.
http://blog.vittuned.com

Edited: LOL didn't notice this thread was almost 3 years old..
 
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