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10-05-2008, 09:09 AM
| #1 (permalink) |
| Registered User Join Date: Aug 2007
Posts: 54
| Turbo Flutter AND BOV too After installing the PTE Front Mount to the car, I start to hear the flutter noise from the turbo which I notice on other people's Grand National. But, this is the confusion  When I go alittle bit or half the throttle, I get the flutter noise. If I go Full Throttle for a couple seconds and let off, It gives the Blow Off Valve sound instead of a flutter. I checked all hose connection but found nothing loose. 1987 Buick Grand National: Adj. Fuel pressure, Stage 3 turbo, stock injectors, PTE Front Mount, 3" Downpipe, Hooker Exhaust System, stock headers. Even though I was told to replace the injectors for the Front Mount, the stock injectors still seems to work without any problems.  |
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10-05-2008, 04:13 PM
| #2 (permalink) |
| I thought I was out...  Join Date: May 2005 Location: East Brunswick NJ
Posts: 1,286
| It's called compressor surge, the search feature on this site will be very helpful with regards to it.
__________________ Artie 86 GN Stock Motor 3690lb race weight through the mufflers 11.22@117.9 (with all the applicable safety equipment for ET and speeds attained, including 6pt bar and harnesses)Sold LC2 Powered hybrid project in progress |
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10-05-2008, 05:08 PM
| #3 (permalink) |
| Registered User Join Date: Aug 2007
Posts: 54
| It's not compressor surge. The car runs fine. I'm trying to say that everytime when I go half throttle and let off, it flutters which is common. But when full throttle and let of, it gives a BOV sound like air is leaking out |
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10-05-2008, 10:46 PM
| #4 (permalink) |
| Registered User  Join Date: Mar 2008
Posts: 105
| not enough pressure to even open the BOV at half throttle it seems. how much boost are you making? i dont think a BOV would be necessary
__________________ 1986 GN, walbro 340 w/ hotwire, Q-boost controller, TT chip, RJC powerplate, new valve springs, converted to posi. |
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10-06-2008, 07:58 AM
| #5 (permalink) | |
| Registered User  Join Date: Oct 2002 Location: Wichita KS
Posts: 1,724
| Quote:
It is comp. surge. And it's normal.  Surge isn't a bad thing it happens to us all, nothing to do with the car running good/bad. Don't worry about it. When your "full throttle" there is just more volume of air being stopped when U slam the throttlebody closed, so you will get a loud BOV sound as well as flutter or "surge".
__________________ 86 Rx-7 GXL Hybrid 86 Grand National motor and trans. TRW pistons, Webber ported IRONS, Extender chip,Translator plus,Te-45a, Vig.Torque Conv.(3500), Trans Cooler, 55lb inj's, 10mm Race Wires, Adj. FP Regulator,RJC PP ,FMIC 18x32 spearco bar&plate, Custom 3 inch mandrel DP, postons X-over pipe. deltagate WG, 3.27 rear, WB 02 255 60 MT Progressive alky, 1 m15 nozzle. Best E.T. 10.65 Best MPH 131.4 Still tuning.  | |
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10-06-2008, 08:39 AM
| #6 (permalink) |
| Resident Idiot  Join Date: Sep 2000 Location: Orlando, FL USA
Posts: 10,458
 | Regardless what it is, get rid of the blow off valve. It simply isn't needed and just complicates things.
__________________ Check Out MikesStuff4Sale.com to view my used parts!  ------------------------------------------------ 1987 Buick Grand National Budget 4.1, 204/214 cam, TA-49 Turbo, Stockish Heads, V4, MSD50's, TH DP, JayJackson 62mm TB, Translator plus Extender powered. 3680# with pilot ------------------------------------------------ 1993 Mazda RX-7 4.1 Buick Powered 11.20 @ 128mph (2.4 60')!  |
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