 Evo Vacuum Leak? |
 Jan 23 2006, 10:32 PM
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#1
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 Post Master  Group: Members Posts: 986 Joined: 7-July 04 From: Central Illinois Member No.: 318  |
Tired of it trying die when I lift the throttle - especially after a blip when not really moving ... who knows the vacuum system and can tell me where to check?
Thanks... -------------------- ... she likes bein' forced ...
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Jan 30 2006, 10:24 AM
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#2
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 Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
If you are still using the stock MAF to meter air, you should try your damndest to make a fully recirc BOV work. Its what your ECU is calibrated for. All metered air should stay within the system until it passes through the engine and past the O2 sensor. I've heard good things about Tial's BOV. According to slowboy its one of the largest in the industry at 50mm so it shouldn't have any trouble bypassing all that pressurized air. This should eliminate any compressor surge that you are experiencing.
Now as far as curing your idle problems, I can't say the BOV will help unless its opening at idle because you have the set screw backed out too far. At this point, I think your idle problem could be due to either a bad ECU idle calibration or too much fuel pressure. I'm not ruling out too much fuel pressure because even at idle the ECU may still be expecting you to have a stock Evo pump which pumps much less than a Walbro 255. Even at a low voltage you may be getting too much fuel pressure at idle. I know Kris hasn't had any problems, but we've seen different DSM's respond differently to 255's in the past. My old fwd for example ran just fine on a 255 with no AFPR, but my AWD wouldn't idle for shit until I put an AFPR on and lowered the base fuel pressure. |
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Posts in this topic
Kazz5 Evo Vacuum Leak? Jan 23 2006, 10:32 PM
turbohcar Try a boost leak check. That should automatically... Jan 24 2006, 08:33 AM Kazz5 Have one - only air I get is from BOV and MBC blee... Jan 24 2006, 10:07 AM AWD DSM 1 Boost leak check should catch most if not all of t... Jan 24 2006, 10:29 AM Kazz5 Idle speed's good. Non-stock cams. ISC? Not... Jan 24 2006, 12:20 PM ncgalant Are you running an aftermarket fuel pump? My old ... Jan 24 2006, 01:51 PM Kazz5 Walbro HF 255 ... hrrrmmmmm... and how do I check ... Jan 24 2006, 04:04 PM turbohcar Yes, that is a possibility. I'm not totally s... Jan 24 2006, 04:16 PM natedogg QUOTE (Kazz5 @ Jan 24 2006, 04:04 PM)Walbro H... Jan 24 2006, 04:34 PM black92_tsi_awd QUOTE (Kazz5 @ Jan 24 2006, 04:04 PM)Walbro H... Jan 24 2006, 04:57 PM akamiami it might have to do with something al tuned on the... Jan 24 2006, 06:37 PM Kazz5 It's the thought of the reflash that's cha... Jan 24 2006, 09:41 PM Kazz5 QUOTE (akamiami @ Jan 24 2006, 06:37 PM)it mi... Jan 24 2006, 09:48 PM akamiami I'd just doubt this is related to an increased... Jan 25 2006, 12:14 AM BudmannG This may not apply to you Kazz, But I was having t... Jan 25 2006, 06:43 AM Kazz5 I've not done another boost leak test. Part o... Jan 29 2006, 09:42 PM Kazz5 Evo's FP is like 43.5 stock at idle and I unde... Jan 30 2006, 01:57 PM natedogg If you put the AFPR on, there's no telling whe... Jan 31 2006, 08:34 AM turbohcar I just bought one of Full Throttle Speed's AFP... Jan 31 2006, 09:13 AM natedogg I may be mistaken, but I took it he wants to know ... Jan 31 2006, 09:26 AM turbohcar Sorry, I misunderstood then. Yes Nate, you are co... Jan 31 2006, 09:30 AM
Kazz5 Thanks guys - good conversation! I'll loo... Jan 31 2006, 09:46 AM |
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