IW STi Forum banner

1 - 20 of 20 Posts

·
Registered
Joined
·
12 Posts
Discussion Starter #1 (Edited)
Hey guys!

I'm having trouble lately with my stage 2 08 sti.

When the engine is cold it sounds normal but when it gets warm and I accelerate normally the sound changes. It's like the normal rumble becomes more aggressive to the point, that it's not normal to me! The car responds well when I go wot. But feels sluggish in normal condition.

It's more noticeable from secondth to fifth gear, between 1800 rpm to 2800 rpm.

I've logged my car, everything was normal, my a/f learning1 was between -6/+6. I had 0 engine roughness or misfire in the whole 2 hours of log. Knock correction was ok as well.

I have zero oil consumption, no smoke at startup. I just changed the spark plugs 2 weeks ago when it started to sound like that. My old plugs had normal wear.

It sounds like my cat is clogged. The downpipe (custom dp from lachute performance with magnaflow high-flow cat) was installed in 2008 after 5000km on the car, now the car has 113 XXXkm. Could it be that?

Can I check if I have problem with my cat without removing my downpipe?

I don't have a check engine light.

Or do you know what might be the cause of my problem?


I decided to make an appointment at lachute performance to check my car out but it's only in 10 days. I'm hoping it's not another ringland case!

Thank you!

-Simon
 

·
Registered
Joined
·
1,956 Posts
If it was a clogged cat you would get the symptom of engine being able to rev smoothly like normal but feels a lack of acceleration throughout "the whole rev range" but gets exponentially more difficult as the rev climbs. Do it enough times like 5 pulls and the temperature will skyrocket to overheat zone. Smell around for rotten egg smell or check your cat or look at O2 sensor in pitch black after pulls, if they look super red hot, the cat is about gone. I had this on my previous car, no codes and no rotten egg smell but cat was clogged. The O2 bung looks red hot in pitch black.
 

·
Premium Member
Joined
·
1,019 Posts
Roughness at 1800-2800rpms? Sounds like the "Stumble" to me. Does it feel like it kind of loses power for a second or two during those RPMs?
 

·
Premium Member
Joined
·
5,389 Posts
Hey guys!

I'm having trouble lately with my stage 2 08 sti.

When the engine is cold it sounds normal but when it gets warm and I accelerate normally the sound changes. It's like the normal rumble becomes more aggressive to the point, that it's not normal to me! The car responds well when I go wot. But feels sluggish in normal condition.

It's more noticeable from secondth to fifth gear, between 1800 rpm to 2800 rpm.

I've logged my car, everything was normal, my a/f learning1 was between -6/+6. I had 0 engine roughness or misfire in the whole 2 hours of log. Knock correction was ok as well.

I have zero oil consumption, no smoke at startup. I just changed the spark plugs 2 weeks ago when it started to sound like that. My old plugs had normal wear.

It sounds like my cat is clogged. The downpipe (custom dp from lachute performance with magnaflow high-flow cat) was installed in 2008 after 5000km on the car, now the car has 113 XXXkm. Could it be that?

Can I check if I have problem with my cat without removing my downpipe?

I don't have a check engine light.

Or do you know what might be the cause of my problem?


I decided to make an appointment at lachute performance to check my car out but it's only in 10 days. I'm hoping it's not another ringland case!

Thank you!

-Simon
Roughness at 1800-2800rpms? Sounds like the "Stumble" to me. Does it feel like it kind of loses power for a second or two during those RPMs?
Well I'd agree the this sound slike typical EJ stumble. But you driven this car long enough to recognize abnormal and it feels abnormal to you. Take it easy on the car till you get this resolved.
 

·
Registered
Joined
·
12 Posts
Discussion Starter #11
Is the car protuned?

What tune/fuel are u running?

Hello from Montreal ;)
I'm on 94 octane from petro-canada! The car was tune at lachute performance with an ecutek license , and this is where I'm going to get the car check!

I don't boost the car and I'm shifting below 3000rpm!
 

·
Registered
Joined
·
12 Posts
Discussion Starter #13
Damn, another Simon from Quebec.

Since your AF Learning values are normal, I would say it's definitely the fuel stumble that our GRs are famous for.
Yes another Simon from quebec aahah!

That was my first taught! I will buy what I need this week for the fuel line and just bring everything to lachute performance. They must have seen this already!

Thank you for your advice! It's really appreciated.
 

·
Registered
Joined
·
806 Posts
I'm not a big fan of "fuel stumble kits" myself... You might want to ask Stéphane to have a look at the tune and do some correction if possible...

Or if you can afford it, I would upgrade the fuel system as it should (upgraded FPR +/- fuels rails, etc)

Have you been using your A/C a lot lately? My car runs a bit weird when the A/C is on... I turn it off 99% of the time and I put ventilation only :) The car behaves perfectly that way!

My 2 cents

Simon
 

·
Registered
Joined
·
2,620 Posts
Or if you can afford it, I would upgrade the fuel system as it should (upgraded FPR +/- fuels rails, etc)
^^ This.

The fuel stumble quick fixes as I like to call them have worked for some, but have had more failures than success' from what I've read. If you want to fix the stumble, do it right the first time and go for FPR and Fuel Rails.
 

·
Registered
Joined
·
3,518 Posts
Petro 94 isn't really the BEST 94 out there, but the only place with it here. I would tune for 91 aggressive personally and use 94 in it anyways. Their 94 contains up to 10% ethanol.

check this thread discussing the two grades in more detail on montrealracing (troll central); Shell V power (91) Vs Petro Canada (94) octane

Shell V-power 91 is really good shit though.

Also, welcome simon#2 from Montreal, where I also reside :p

Finally, hope you're ready to spend a pretty penny at Lachute when you bring your car there :p
 

·
Registered
Joined
·
12 Posts
Discussion Starter #17
I talked to Daniel at lachute today. I was thinking of doing the quick fix + a tune. I asked him to do a leak test and check the ignition system to. I know it's going to cost me a bit more at lachute but I trust them!

I'm not running the a/c! I like the rumble to much ahhah!

I'm still debating to get a tune on 91 thought. I'll ask the guys at lachute monday what they think! I've read the whole 9 page but there so much disinformation loll!

Is there another place I should consider taking my car to next time?

I'm glad to see so many locals on iwsti! By far, imo, the best forum out there!
 

·
Registered
Joined
·
806 Posts
Not many shops around, no..

I have always prefered having a 91 octane tune (Shell) since the 94 is only in Montreal area and I have red somewhere that Petro Canada 94 octane wasn't as good winter vs summer, etc.

I would stick to whatever is safer since you're on Ecutek, so I guess you don't have an Accessport to monitor for knocks and other parameters...
 

·
Registered
Joined
·
3,518 Posts
I talked to Daniel at lachute today. I was thinking of doing the quick fix + a tune. I asked him to do a leak test and check the ignition system to. I know it's going to cost me a bit more at lachute but I trust them!

I'm not running the a/c! I like the rumble to much ahhah!

I'm still debating to get a tune on 91 thought. I'll ask the guys at lachute monday what they think! I've read the whole 9 page but there so much disinformation loll!

Is there another place I should consider taking my car to next time?

I'm glad to see so many locals on iwsti! By far, imo, the best forum out there!
yes, the MontrealRacing thread has a ton of trolls and mis-information. But the basis is, a tune on 94 is risky here in Quebec because the only place that has 94 is Petro, and it isn't 'legit' 94; unless you have a really good tuner who will tune you on Petro's 94, but even still, I would play it safe with a proper 91 tune. I have never heard anyone complain about Shell's 91, most, if not all, agree it is the best gas out there. I work in the petroleum industry so I can confirm that all these stations get their gas from the same place, however, they add different additives to it, some better/more effective than others, and they refine it to the minimum required specs of each grade (87, 89, 91), any extra refining is a bonus.

Unfortunately, at this point, the only 'subaru-performance-oriented' shop near Montreal is Lachute. I feel like most people have a love-hate relationship with them. Many love them, many have been turned off by them. Hard to tell. I can't comment other than the fact that I find them steep in pricing. They are more pricey than the dealerships on a per-hour basis by 15-20%, which I find a lot. They have some good technicians though, or so I have heard. You'll have to do your own research and decide for yourself if you like them or not. We are kind of screwed here, as the Toronto/ontario area has a few reputable shops, whereas we only have one for our subies that really caters to us (aka lachute)
 

·
Registered
Joined
·
12 Posts
Discussion Starter #20
I got my car back from lachute today! The stumble is now gone. It turn out to be one of my tgv that was bad! I never taught of that.. They also change my diff and transmission oil! I was really impressed with they're services. They even lent me a stage 2 Sti as my replacement car!

The compression test and leak test was great, not more than 5% all around, so it's a big relief !

Thank you for all your help!

-Simon
 
1 - 20 of 20 Posts
Top