Avo turbo backifring - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Astroboy · 10-04-2014, 11:51 PM

Thump, like a kick to the tire sort of sound. Every time I start up my car I hear a thump coming from the passenger side of the engine bay. When I turn on the ignition, I hear this thump coming from that side with a little startle. Car runs fine, no weird noises while cruising, no sign of idle dips so I figured it might be one of the components from the avo kit.

Astroboy · 10-04-2014, 11:56 PM

Quote:

Originally Posted by Sportsguy83

Describe the thump

^^ this. It only happens at start up. I've asked multiple people who had the di seal faliure but I never get responses. I think they don't like to talk about it.

statik · 10-05-2014, 12:50 AM

Quote:

Originally Posted by Astroboy

^^ this. It only happens at start up. I've asked multiple people who had the di seal faliure but I never get responses. I think they don't like to talk about it.

this doesn't sound like DI seals, you should be able to get a reproducible popping when revving the engine, you would notice it driving around.

its possible your exhaust is hitting against something that only occurs during cranking, maybe the over pipe?

Astroboy · 10-05-2014, 01:12 AM

Quote:

Originally Posted by statik

this doesn't sound like DI seals, you should be able to get a reproducible popping when revving the engine, you would notice it driving around.

its possible your exhaust is hitting against something that only occurs during cranking, maybe the over pipe?

I remember first experiencing this noise when I first started to feel my car shake due to bad motor mounts. I ended up having the mounts replaced with Perrin motor mounts which stopped the vibration I was feeling, so maybe you are right about that. I'll check it out, thanks for the response bro.

Astroboy · 10-05-2014, 01:13 AM

Quote:

Originally Posted by statik

this doesn't sound like DI seals, you should be able to get a reproducible popping when revving the engine, you would notice it driving around.

its possible your exhaust is hitting against something that only occurs during cranking, maybe the over pipe?

Also, if it were the di seals, would the popping affect the rpm gauge? Would it make it dip or shake sometimes?

Sportsguy83 · 10-05-2014, 01:33 AM

The firecrack popping of DI Seals is noticeable after starting the car and accelerating it at idle.

I'd think it's the overpipe too.

Sent from my SAMSUNG-SM-N900A using Tapatalk

dabocx · 10-05-2014, 02:19 AM

I wish I was cool and backfired

Poodles · 10-05-2014, 02:41 AM

What you guys are referring to is a muffler explosion or afterfire. A backfire is when it happens in the intake.

One is mostly harmless (if you still have cats it will cause issues) while the other can cause serious harm (and if it's happening on a fuel injected car, something is SERIOUSLY screwed).

Astroboy · 10-05-2014, 03:32 PM

Quote:

Originally Posted by Sportsguy83

The firecrack popping of DI Seals is noticeable after starting the car and accelerating it at idle.

I'd think it's the overpipe too.

Sent from my SAMSUNG-SM-N900A using Tapatalk

David, does the di issue affect the rpm gauges? Does it make the rpm stutter or or shake each time it pops.

Sportsguy83 · 10-05-2014, 04:18 PM

Quote:

Originally Posted by Astroboy

David, does the di issue affect the rpm gauges? Does it make the rpm stutter or or shake each time it pops.

I don't know the answer, but my guess is no.

wcbjr · 10-06-2014, 12:34 PM

Quote:

Originally Posted by Poodles

What you guys are referring to is a muffler explosion or afterfire. A backfire is when it happens in the intake.

Came here to post this.

Backfire: [ame="https://www.youtube.com/watch?v=hKVlzNt-4tE"]intake backfire - YouTube[/ame]

Astroboy · 10-06-2014, 09:43 PM

Quote:

Originally Posted by wcbjr

Came here to post this.

Backfire:

Yes, but unfortunately I'm not getting any answers to my questions about the issue. Actually, I don't even get responses half of the time

Poodles · 10-07-2014, 11:01 PM

Quote:

Originally Posted by Astroboy

Yes, but unfortunately I'm not getting any answers to my questions about the issue. Actually, I don't even get responses half of the time

You never answered the simple question: Do you have a BOV venting to atmosphere?

Astroboy · 10-08-2014, 01:07 PM

Quote:

Originally Posted by Poodles

You never answered the simple question: Do you have a BOV venting to atmosphere?

Nope. I have a turbo smart bpv installed in my car. Why?

Sent from my iPad using Tapatalk

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FBM Stage 1 Base Turbo Kit Starting @ $3995 Garrett or PTE Turbo Choices	FullBlown	Forced Induction	588	12-02-2015 03:41 PM
fs feeler full blown turbo kit minus turbo	kingkai23	Engine, Exhaust, Bolt-Ons	10	03-11-2014 03:59 PM
nj brand new fa20 turbo kit minus turbo 2500	kingkai23	NY / NJ / CT / PA	3	03-06-2014 07:41 PM
Geneva Preview: Techart to debut 911 Turbo, Turbo S	vh_supra26	Other Vehicles & General Automotive Discussions	1	02-22-2010 07:20 PM

10-05-2014, 02:19 AM	#21
dabocx Senior Member Join Date: Jan 2012 Drives: Scion FRS Location: United States Posts: 1,267 Thanks: 564 Thanked 261 Times in 191 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	I wish I was cool and backfired

10-05-2014, 02:41 AM	#22
Poodles Senior Member Join Date: Oct 2013 Drives: 2015 Series.Blue Location: Fort Worth, TX Posts: 1,781 Thanks: 88 Thanked 781 Times in 481 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	What you guys are referring to is a muffler explosion or afterfire. A backfire is when it happens in the intake. One is mostly harmless (if you still have cats it will cause issues) while the other can cause serious harm (and if it's happening on a fuel injected car, something is SERIOUSLY screwed).

User Name		Remember Me?
Password