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Old 07-31-2013, 08:42 PM   #1
Jr_gosetto
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Default Poor throttle responce

Question

What would cause an 05 RS with 120k on it to have a half second throttle delay is it just the DBW system (actually timed it best I could time was .7 seconds from my foot hitting the gas and the car responding I call it .5 incase I was a bit slow in the stop)
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Old 08-01-2013, 01:42 PM   #2
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is it 4eat? reset your ecu and tcu using some sort of software like romraider and see if it happens still. I had this problem with my 09 and fixed it by resting and rescaling the maf. getting a tune for no Open loop delay also helps.
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Old 08-01-2013, 03:13 PM   #3
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Quote:
Originally Posted by Pickler View Post
is it 4eat? reset your ecu and tcu using some sort of software like romraider and see if it happens still. I had this problem with my 09 and fixed it by resting and rescaling the maf. getting a tune for no Open loop delay also helps.
Sorry not good with acronyms I have heard or 4eat but Idk what it means and I'm guessin tcu means timing control unit?? And did u do all that with an open source tune??
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Old 08-02-2013, 09:45 PM   #4
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And question is it normal to hear a slight whistle/whine while under acceleration and while steady on gas it goes away after I left off
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Old 08-02-2013, 11:36 PM   #5
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4eat is referring to an auto transmission. 05 is not DBW either. If you look under the hood you'll see 2 cables. One for throttle, one for cruise. Any delay in throttle response would be spark plugs, wires, bad gas, ****ty aftermarket intake, bad knock sensor, bad grounds, or loose throttle cable. Try all of those things and report on your findings
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Old 08-03-2013, 11:17 AM   #6
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Quote:
Originally Posted by Rudgers73 View Post
4eat is referring to an auto transmission. 05 is not DBW either. If you look under the hood you'll see 2 cables. One for throttle, one for cruise. Any delay in throttle response would be spark plugs, wires, bad gas, ****ty aftermarket intake, bad knock sensor, bad grounds, or loose throttle cable. Try all of those things and report on your findings
Hey rudgers good to know what people mean when they say 4eat and to answer the previous question I have the 5 speed MT (you know the fun ones haha) all 5 cars I have bought in the past 3 years have been standards. I don't buy auto subies there not as much fun

And also my car is DBW I would show a pic but idk how to do so on the mobile app for the iPhone. I know what drive by wire is and I know what a throttle cable is trust me, I wouldn't have posted this thread without that knowing that much. I have changed my plugs, I have no aftermarket intake I have the stock airbox only took off the scilencer, that was sucking air up by the hot radiator. I have good gas I drive about 600km a week so unless every gas station has bad gas I'm fine there. and since I have no throttle cable it's not loose I have owned 3 subies I know what DBW is and I know what cable throttle is. 05 has DBW 04 doesn't trust me on this one brother I own the car. And if you can tell me how to upload pics ill show you the electronic realybox on the throttle body.
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Old 08-03-2013, 06:54 PM   #7
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Quote:
Originally Posted by Rudgers73 View Post
4eat is referring to an auto transmission. 05 is not DBW either. If you look under the hood you'll see 2 cables. One for throttle, one for cruise. Any delay in throttle response would be spark plugs, wires, bad gas, ****ty aftermarket intake, bad knock sensor, bad grounds, or loose throttle cable. Try all of those things and report on your findings
all but a select few USDM 05 imprezas are dbw.
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Old 08-03-2013, 07:42 PM   #8
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Quote:
Originally Posted by RaceFaceXC View Post

all but a select few USDM 05 imprezas are dbw.
Well the I guess I got shafted
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Old 08-03-2013, 08:06 PM   #9
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Well the I guess I got shafted
I guess but i would gladly take cable throttle on my 07 if I could still open source tune it
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Old 08-03-2013, 08:08 PM   #10
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So I guess I am far from the only one who is very disappointed with Subarus DBW system
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Old 08-05-2013, 01:37 AM   #11
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i don't want to turn this into a discussion but wanted to throw my 2 cents in about DBW. i feel all DBW systems suck for all makes.if im correct was it Toyotas DBW system that got recalled. My mothers Nissan was pretending to be a Toyota and sticking to the floor every now and again cables are really the best way to control throttle. Sorry for the off topic post .


my mother now drives a 2013 legacy. Told me shes hooked to subies
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Old 08-05-2013, 09:54 AM   #12
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There is indeed a delay with DBW. Something tells me though that the OP doesn't have a USDM car - fill your profile/location, maybe?
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Old 08-05-2013, 12:53 PM   #13
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Quote:
Originally Posted by Bluefoton View Post
There is indeed a delay with DBW. Something tells me though that the OP doesn't have a USDM car - fill your profile/location, maybe?
Sorry about that I thought I filled it out before but I only have an iPhone for Internet and guess something screwed up. And what do you mean by OP, I filled out the location and things but incase it didn't work again I live In collingwood Ontario
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Old 08-05-2013, 01:07 PM   #14
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OP = Original Poster = You

Subaru's NA 2.5 engines got DBW in 2005.

There's a nice thread on it:
http://forums.nasioc.com/forums/show....php?t=1537010
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Old 08-05-2013, 01:44 PM   #15
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Quote:
Originally Posted by Bluefoton View Post
OP = Original Poster = You

Subaru's NA 2.5 engines got DBW in 2005.

There's a nice thread on it:
http://forums.nasioc.com/forums/show....php?t=1537010
Hahahahha don't I feel like an idiot and I don't think so either. My car was built by FHI so I'm sure it was made in japan. And thanks for the link ill look at it now
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Old 08-05-2013, 02:27 PM   #16
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Great thread referred helps its a big chunk to just dive into. ill have to do some more research for it to make perfect sense tho. But from what I understand the 05 has the simplest DBW system and the worst thought out. It puts out full power about about 40% throttle, so it's hard to get a the power down accurately. one of these days ill call up my locale tuner and set up a dyno tune day, and see what we can do
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Old 08-05-2013, 02:42 PM   #17
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My 06 Impreza has been plagued by a very bad throttle problem when driving in stop and go traffic. The throttle response will sometimes be so jerky that the car will buck as if I was just learning how to drive a standard. I end up having to ride the clutch more than I would like just to get a smooth start.
I pulled the throttle body off last year and cleaned the throttle plate really good. This seemed to help a bit but I have never been able to get rid out it totally. I have feared that this is just common behavior for the DBW and I will have to live with it. The engine runs great otherwise and idles fine as well.
Any ideas?
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Old 08-05-2013, 06:36 PM   #18
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Originally Posted by JohnM10 View Post
My 06 Impreza has been plagued by a very bad throttle problem when driving in stop and go traffic. The throttle response will sometimes be so jerky that the car will buck as if I was just learning how to drive a standard. I end up having to ride the clutch more than I would like just to get a smooth start.
I pulled the throttle body off last year and cleaned the throttle plate really good. This seemed to help a bit but I have never been able to get rid out it totally. I have feared that this is just common behavior for the DBW and I will have to live with it. The engine runs great otherwise and idles fine as well.
Any ideas?
Are you in Florida? You could be heat soaking your ait sensor... My wrx used to do that when I had a bad ait compensation in my tune...it would only do it in the summer when it's around 90-100 outside in traffic or at a light for a bit while idling...I live in Florida and my car hates the summer time...thats why I asked...I tuned it in the winter and the summer came and i hated it I got a summer tune recently and it cured my issue with it holding up and releasing like that.. It be like I hit the gas and it would catchup to itself all at once instead of gradually. Felt like it wanted to buck on me...the N/A ones could be different though I haven't driven it but just something to look into...it's unlikely if your still with your factory tune...but I'm not sure how well that tune is on that car... The wrx one was horrible...throttle was lagging... It would drop power way to early in the band... It just wasn't the best...but the ait sensor in your maf assembly could be faulting or your maf sensor might just need to be cleaned too... Hit it with some mass airflow cleaner...
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Old 08-05-2013, 08:20 PM   #19
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Quote:
Originally Posted by Jr_gosetto View Post
Hahahahha don't I feel like an idiot and I don't think so either. My car was built by FHI so I'm sure it was made in japan. And thanks for the link ill look at it now

All Imprezas sold in North America are built by Fuji Heavy Industries in Japan, btw...
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Old 08-06-2013, 12:18 PM   #20
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I was just stating bc I remember reading somewhere that there was a place in Arizona or somthing like that I remember it being somewhere in the states that starts stars with A I got stair 50s in geography lol
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Old 08-06-2013, 12:21 PM   #21
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And thought I would ask if there is much power to be freed up my doing an OS tune. I was talking to a old friend whos a mechanic and avid racer who said 50-60 horsepower could be freed up and was woundering if there is much truth behind this for the 05 RS
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Old 08-06-2013, 01:04 PM   #22
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^ Your friend certainly didn't work on Subarus. Maybe a proper tune would generate an instantaneous 50hp increase, followed by grenading the engine in less then a rotation, but that's it. Read the N/A forum threads, there has been a lot of discussion regarding the (very limited) improvement potential of our engines. People have been drooling over increasing the power of the 2.5 ...well since the 2.5 made it on the market.
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Old 08-06-2013, 03:47 PM   #23
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That's a little blunt, and finding that kind of thread takes weeks to filter thru the ****. So I thought I would try and ask. Could u elaborate on how it wouldn't last one revolution. I hear(as in looked thru the forums) the rs block will handle 300 hp. So what would go wrong exactly. And I was only saying I heard there could b an increase like that I didn't say I heard I should get atleast 50 so wats a realistic hp gain from remapping
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Old 08-07-2013, 09:43 AM   #24
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Didn't mean to be rude, just excessively sacrastic. You (or your friend) only mentioned tuning it - in which case there is no way in hell to "free" 50hp on top of the existing 170. Maybe i misread you, but it triggers an allergic reaction due to the the quantity of people asking if "tune", a "chip" or an "intake" can quadruple the output horsepower. People tend to forget that Subaru engineers are not pre-school dropoffs who design things using an abacus. A lot of things on the N/A engine are quite optimized from factory, and if any single cheap change yields a substantial improvement, one has to worry about the hidden price to pay - such as a drastic reliability or longevity drop. Simply speaking, there is pretty much no hidden power to free up using basic approaches such as a tune, an exhaust, or an intake (which one considers as the typical, simple bolt-ons).


Now, you mentioned hearing that te block itself could indeed handle 300hp - true. But this is a whole other ball park, given the amount of expensive parts, other than the block, that constitute the engine. Change / beef up the internals, provide it with an apropriate tune for the resulting build, adapt the intake and exhaust, and yes you could have a beast - but we're not talking about the same engine, and definitely not of a tune-resulting power increase. With a custom built, you're not freeing up any chained power - you're simply changing the engine so as to make it more powerful. Also, the problem is that with any serious modifications, unless you have the skills to do them yourself, the price tag shoots through the roof, rapidly crossing the cost of a WRX swap, or a sell-your-car-and-get-a-WRX. Just outsourcing a change in cams + a tune can make you wonder if you shouldn't get a Subaru-made factory turbo car - which is why N/A builts are meant for enthousiast who don't count the $/lbs.ft of torque increase, but who enjoy a a fascinating money pit project

Hope it helps!
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Old 08-07-2013, 01:05 PM   #25
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Ya it does help, and I have thought of redoing the engine with TWE stage 2 head Package, bored and optimized throttle body, and also there 11.2:1cr pistons
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