|
Forced Induction Turbo, Supercharger, Methanol, Nitrous |
|
Thread Tools | Search this Thread |
07-22-2017, 08:52 PM | #1 |
Senior Member
Join Date: Mar 2016
Drives: Raven Black Scion FRS
Location: Bay Area, CA
Posts: 544
Thanks: 45
Thanked 171 Times in 104 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
Thump sound when blipping/stabbing throttle (Supercharged)
Hey all,
I have a JRSC C30 kit installed on my 2013 FRS, tuned with ecutek + delicious. After loading my base tune, I have noticed that whenever I downshift (rev match) or blip the throttle, I hear a thumping sound coming from ahead of me. This occurrence only happens when I blip the throttle. The sound is not an exhaust pop, as it is not a sharp sound. Instead, it is a muted, toned down knocking sound. The thump is too faint to be recorded on video. This noise happens regardless of the gear (idle, first, second, etc). All the sounds are the same, and it is hard to diagnose what exactly it is. Despite having received several revision tunes, the sound still persists. I have checked all my hoses, and there seems to be no vacuum leaks or leaks in general. At the same time, my throttle response has become more sluggish ever since installing the kit and receiving the tune. Anyone else have this issue? I did not have this noise when I was NA, and the issue only arose once the kit and tune were on the car. Note: I do not experience this sound when the throttle application is gradual, rather than abrupt. The noise seems to be coming from ahead of me in the engine bay, I also hear a vacuum sound simultaneously. Could this just be the intake? More notes: narrowed down where the sound is coming from. Seems to be coming from the throttle body tube compressing upon sudden load. I have attached a video showing what I mean Any idea if this is normal? The hoses are completely clamped down and seated properly, yet this still occurs.
__________________
@thomsonsss
Black (Raven) D4S Scion FRS (Sold)|| Black (CBP) FK8 Civic Type R || Black (BSM) F80 M3 Comp (Sold) || Black (Jet) E46 M3 || Laguna Seca Blue (LSB) E46 M3 (Sold) || Alpine White (AW) E92 M3 || Carrara White 997 GT3RS Last edited by adjusts; 07-22-2017 at 09:54 PM. |
07-22-2017, 08:54 PM | #2 |
Panda Trueno
Join Date: Jan 2015
Drives: No twin now.
Location: North Indiana
Posts: 3,347
Thanks: 2,113
Thanked 2,407 Times in 1,332 Posts
Mentioned: 17 Post(s)
Tagged: 2 Thread(s)
|
Well, think about components that are "underneath you" and troubleshoot from there.
|
07-22-2017, 09:39 PM | #3 |
Senior Member
Join Date: Mar 2016
Drives: Raven Black Scion FRS
Location: Bay Area, CA
Posts: 544
Thanks: 45
Thanked 171 Times in 104 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
Edit for words: just attained a video showcasing what's going on. Any idea how this can be fixed? Everything's tightened down.
__________________
@thomsonsss
Black (Raven) D4S Scion FRS (Sold)|| Black (CBP) FK8 Civic Type R || Black (BSM) F80 M3 Comp (Sold) || Black (Jet) E46 M3 || Laguna Seca Blue (LSB) E46 M3 (Sold) || Alpine White (AW) E92 M3 || Carrara White 997 GT3RS Last edited by adjusts; 07-22-2017 at 09:54 PM. |
07-22-2017, 10:52 PM | #4 |
Panda Trueno
Join Date: Jan 2015
Drives: No twin now.
Location: North Indiana
Posts: 3,347
Thanks: 2,113
Thanked 2,407 Times in 1,332 Posts
Mentioned: 17 Post(s)
Tagged: 2 Thread(s)
|
Are you talking about the sudden air induction noise?
|
07-22-2017, 11:16 PM | #5 |
Senior Member
Join Date: Mar 2016
Drives: Raven Black Scion FRS
Location: Bay Area, CA
Posts: 544
Thanks: 45
Thanked 171 Times in 104 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
I'm talking about the compression of the inlet tube. Not sure if its somtehing to be expected or if its irregular.
__________________
@thomsonsss
Black (Raven) D4S Scion FRS (Sold)|| Black (CBP) FK8 Civic Type R || Black (BSM) F80 M3 Comp (Sold) || Black (Jet) E46 M3 || Laguna Seca Blue (LSB) E46 M3 (Sold) || Alpine White (AW) E92 M3 || Carrara White 997 GT3RS |
07-23-2017, 12:52 AM | #6 |
Senior Member
Join Date: May 2016
Drives: 2023 BRZ
Location: Houston, TX
Posts: 208
Thanks: 174
Thanked 219 Times in 90 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
What the heeell i've never seen anything like that but all my aftermarket intakes had aluminum piping. I hope thats a defective tube and not the real deal.
Id contact JR about it for sure. |
The Following User Says Thank You to OND For This Useful Post: | adjusts (07-23-2017) |
07-23-2017, 12:08 PM | #7 |
Senior Member
Join Date: Dec 2012
Drives: Panda FR-S
Location: Corona, California
Posts: 531
Thanks: 297
Thanked 377 Times in 161 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
|
Interesting, I have the same issue. Similar sound. Only difference is that I have an aluminum inlet tube. But sometimes when I blip the throttle, it would make that noise. I know when I would cold start my car on e85, it would make that similar noise also. I data logged on start up one time and it didn't detect knock. I think my issue is different as yours seems to be strictly with air pressure.
__________________
Vortech SC on 9psi Pulley, Invidia Catless Front Pipe, Invidia N1 Catback Exhaust
242whp/197ft-lb on Mustang Dyno (91 octane water) 284whp/223ft-lb on Mustang Dyno (E85) Delicious Tuning |
The Following User Says Thank You to Cal3000 For This Useful Post: | adjusts (07-23-2017) |
07-23-2017, 01:56 PM | #8 | |
Senior Member
Join Date: Mar 2016
Drives: Raven Black Scion FRS
Location: Bay Area, CA
Posts: 544
Thanks: 45
Thanked 171 Times in 104 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
Quote:
__________________
@thomsonsss
Black (Raven) D4S Scion FRS (Sold)|| Black (CBP) FK8 Civic Type R || Black (BSM) F80 M3 Comp (Sold) || Black (Jet) E46 M3 || Laguna Seca Blue (LSB) E46 M3 (Sold) || Alpine White (AW) E92 M3 || Carrara White 997 GT3RS |
|
07-24-2017, 12:04 AM | #9 |
Senior Member
Join Date: Mar 2015
Drives: 2015 Subaru BRZ Limited CWP
Location: SoCal
Posts: 1,561
Thanks: 34
Thanked 669 Times in 469 Posts
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
|
sorry that I have nothing useful to say, but DAMN that looks crazy lol
__________________
|
07-24-2017, 03:42 PM | #10 |
Senior Member
Join Date: Mar 2016
Drives: Raven Black Scion FRS
Location: Bay Area, CA
Posts: 544
Thanks: 45
Thanked 171 Times in 104 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
some updates:
Getting a variety of answers: some say its the silicon inlet hose and it must be replaced with an aluminum one. Jackson racing is informing me that its the bypass valve, but everything seems to be hooked up properly and clamped down. Anyone else have this problem with the car? My tuner says its a mechanical issue, but there doesnt seem to be any leaks/issues.
__________________
@thomsonsss
Black (Raven) D4S Scion FRS (Sold)|| Black (CBP) FK8 Civic Type R || Black (BSM) F80 M3 Comp (Sold) || Black (Jet) E46 M3 || Laguna Seca Blue (LSB) E46 M3 (Sold) || Alpine White (AW) E92 M3 || Carrara White 997 GT3RS |
07-24-2017, 04:34 PM | #11 |
Senior Member
Join Date: May 2016
Drives: 2023 BRZ
Location: Houston, TX
Posts: 208
Thanks: 174
Thanked 219 Times in 90 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
I'd definitely listen to JR instead of some random dudes on a forum (like me)
It makes sense that a stuck bypass valve would cause the "vacuum shock" in the intake hose. There are multiple threads online that mention simple tests to see if the valve is working, which might help you. |
|
|
Thread Tools | Search this Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Throwout bearing? Noise when blipping the throttle with the clutch in... | VVT4ME | Issues | Warranty | Recalls / TSB | 6 | 04-23-2017 03:55 AM |
Thump sound from Borla Exhaust? | blightmike | Engine, Exhaust, Transmission | 8 | 02-28-2016 12:08 PM |
Is stabbing the throttle bad? | Astroboy | Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) | 24 | 06-18-2015 01:11 PM |
Ways for faster revving when blipping the throttle?? | glamcem | Tracking / Autocross / HPDE / Drifting | 41 | 06-19-2014 01:16 AM |
Clicking when blipping throttle | Colpup | Issues | Warranty | Recalls / TSB | 7 | 06-09-2014 10:55 PM |