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Old 04-25-2001, 12:57 AM   #1
Scooby Newbie
Member#: 1608
Join Date: Jun 2000
Location: Japan
Post What does detonation feel like??

I have a stock MY01 RS, and lately under heavy acceleration above 4K rpm I feel little bumps and surges (I don't know how else to describe it) while I am accelerating. Is this detonation, and should I use a higher octane fuel?
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Old 04-25-2001, 03:30 PM   #2
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Old 04-25-2001, 03:51 PM   #3
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Member#: 3269
Join Date: Dec 2000
Chapter/Region: SCIC
Location: San Diego
2001 2.5RS Sedan STM


A lot of people have hesitation around 4.5k rpms. I believe it is normal. I dunno if this is what you are talking about. I don't think u can feel detonation. From what people describe it is like a muffled metalic "ping". I've never heard it so I'm sorry I cant be anymore specific.

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Old 04-25-2001, 03:53 PM   #4
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Chapter/Region: Tri-State
Location: brokenmotorsports.com
Team Broken: V6 GF


The impreza is designed to run on 87, I use 89.

You cant "feel" detonation. You can hear it.

when does it surge? right around 4k? thats when the engine starts making its power right through until right before redline so you are going to feel it surge when it gets in the power band.

Jay McDade
Auto Tech--Lincoln/Mercury/Jaguar
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Old 04-25-2001, 03:57 PM   #5
Saw Jai
Scooby Specialist
Member#: 716
Join Date: Jan 2000
Location: Cupertino, CA USA
MY00 Impreza 2.5RS
Blue Ridge Pearl


It might be your clutch giving if you have a manual. Imagine the clutch slipping just a tiny bit as you're accelerating...that'll cause the car to feel "bumpy" and surge when it regrips...

Our stock clutches aren't the greatest clutches out there...I had mine replaced at 16k miles under warrenty because it was slipping (kinda like you described) and shuddering.
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Old 04-25-2001, 04:13 PM   #6
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Location: NYC and Troy, NY
2001 Impreza 2.5RS


I think all MY00/01 has that slight hesitation at 4k RPM.

Detonation is something you don't feel, but you can hear. It's a little pinging and knocking sound you sometimes hear on older vehicles without knock sensors. Have you ever noticed some cars from the 80's and even 90's got some pinging noise when going uphill or accelerating?
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Old 04-25-2001, 07:36 PM   #7
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Join Date: Feb 2001
Location: santa rosa, ca, usa
2004 STi Aspen White
Bone Stock for now


During hard acceleration I feel a bump through out the whole car. My belief is that the center diff is transferring power to the rear wheels and that is what you may be feeling when you accelerate hard. Do you notice when accelerating slowly that the surge/bump doesn't happen?.
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