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Aug 13, 2009, 08:20 PM
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#1
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Evolving Member
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Location: Denver, CO
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low rpm knock with e85
weird phenomenon.
Evo VIII on e85 getting high knock counts, with evoscan in low rpms 2800-3200 rpms....
Above 3200 I can rip on the car without a count... below and gradually rises.
Tried changing the timing, both down then up. Nothing happened, same response, Leaned it out a bit, and nothing happened. back to timing and nothing.
I'm just stumped... Only other issue I hear is my power steering pump, which wines like a dying bird... thought that could be setting it off but I won't know till I replace it.
Got M2's, 16g, and fullrace header.
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Aug 13, 2009, 08:22 PM
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#2
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Drives: Evolution
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hermmmm
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aem intake, hks ti catback, invidia test pipe, downpipe, ported mani, hks 272s, fidenza camgears, 1200cc injectors, motor mounts, torque dampener, fp green turbo, ams intercooler and piping, hks ss bov, aem ems, cosworth head studs, walbro 255 fuel pump, hks DLI ignition amplifier, apexi n1 coil, act 2700, ams mini battery, slotted rotors, defi boost, egt, oil temp, aem wideband, apexi tt,e85. 426whp @ 27psi
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Aug 13, 2009, 09:43 PM
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#3
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Location: Sacramento, CA
Posts: 1,923
Drives: 2004 Evo RS
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Sounds like classic phantom knock to me.
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Car: 2004 Evo RS on E85 with Speed Density ECU mod
Buschur Parts:
Cone filter , IC pipes, Race Intercooler
Other parts:
Zeitronix WB,Tial Sport Q, Walbro 255lph, ACT 6 Puck with prolite flywheel ,GSC S1 cams, 1200cc injectors, Cobb catbac, Helix downpipe & O2 Outlet, 100 cell cat, 3 Port , FP Red, Stock ECU, Stock block/head/intake/tb
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Aug 13, 2009, 10:01 PM
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#4
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Well I've been reading threads for the last two hours and could be a number of issues.
Here's just a few mechanical issues that could be the problem:
- Cam not lined up properaly
- Jumped timing - valve train
- clutch, exhaust, header vibrating
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Aug 13, 2009, 10:37 PM
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#5
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Location: Atlanta, Transplanted from Toronto, Canada
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Drives: Electron Blue EVO IX SSL GSR and 01 IS300, previously 98 ITR, B18C5 93 Hatchback, 04 BO SRT-4,
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If he jumped timing then he'd have bigger issues then low RPm knock....more then likely something is setting the knock count off and at lower RPM's your cams might cause it vibrate more then normal (You might be on to something with the power steering making noise). If your exhause is hitting something and making a metal on metal sound I've seen that give phantom knock as well.
What count? 2-3?
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Greddy Ti-C TBE
BC Racing Inverted Coilovers
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Gruppe-S Gauge Panel
AEM UEGO
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1200cc PTE
Walbro 255
3000/6000k HID f-lights/h-beams
Ebay 02 Housing
Kelford 272's
Supertech Dual valve springs/retainers
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Aug 14, 2009, 08:12 AM
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#6
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count goes all over the place, sometimes hitting as high as 30 counts. This only happens between 2900 - and 3300 rpms. It's a very small narrow band.
I definitely might have rattling issues with my exhaust, I know it almost if not does vibrated against my cusco underbrace. I've also been told it could be from my fullrace headers. Clutch is getting old and there's more chatter than before.
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Aug 16, 2009, 12:29 AM
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#7
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Location: Torrance
Posts: 44
Drives: Wicked White '05 EVO
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Are you throwing a P0300 code at all?
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2005 Wicked White Evolution VIII-E85
412/404whp tuned by Church Automotive
1993 Nissan Sentra SE-R (NASA TTE/PTE)
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Aug 17, 2009, 11:46 AM
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#8
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I'm not throwing any codes at all.
So weird, it only shows knock at really low load... and only in the 3000 - 3500 rpm range.
today on my way to work I'm cruising in 5th gear and it still does it around 3400 rpms.
Replaced my spark plugs this wkend, and no signs on the plugs of detonation...
Thinking of turning down my knock sensor sensitivity in this region...
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Aug 17, 2009, 01:46 PM
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#9
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Location: Sacramento, CA
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Drives: 2004 Evo RS
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Quote:
Originally Posted by sdfontanini
I'm not throwing any codes at all.
So weird, it only shows knock at really low load... and only in the 3000 - 3500 rpm range.
today on my way to work I'm cruising in 5th gear and it still does it around 3400 rpms.
Replaced my spark plugs this wkend, and no signs on the plugs of detonation...
Thinking of turning down my knock sensor sensitivity in this region...
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Thats what i ended up doing I think the cams i installed were the final straw in the knock sensor at that range.
__________________
Car: 2004 Evo RS on E85 with Speed Density ECU mod
Buschur Parts:
Cone filter , IC pipes, Race Intercooler
Other parts:
Zeitronix WB,Tial Sport Q, Walbro 255lph, ACT 6 Puck with prolite flywheel ,GSC S1 cams, 1200cc injectors, Cobb catbac, Helix downpipe & O2 Outlet, 100 cell cat, 3 Port , FP Red, Stock ECU, Stock block/head/intake/tb
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Aug 17, 2009, 02:59 PM
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#10
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So I turned down the knock sensor sensitivity. Now only seeing maybe 1 count of knock in the lower rpms. Car pulls amazing, no more falling on it's face. Like you Roadspike, I'm thinking my M2 cams are what's setting it off.
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Aug 17, 2009, 08:36 PM
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#11
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Posts: 699
Drives: 88590715
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I had the same issue. It is phantom knock (assuming your mapping is correct). If you are able to adjust knock tables, then that would help.
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E85 duel tephra V7 map/ J O T switch/ Fast Freddie UEGO harness adapter/ GM 3 port and some other stuff
Attempting SD in a couple of weeks
Quote:
Originally Posted by leethaxor
My motors always were more tolerant to detonation when I ran with blown headgaskets. They were always faster.
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