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Maxed out 550's?


khadiyev
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Galant VR-4 org Post #: 51573 posted 08/19/02 10:46 PM     Remind Me!  Send Private Message   Edit Post      
Ok, I got a set of RC550cc right now, i posted an article earlier about me dynoing my car. and getting HP:336 at 21-22 psi at the wheels, up to 7500rpms but then past that i just get crazy knock like 12-19 counts and my timing retards. Everything above 4k is +50% on the AFC. it goes fine before 7k but as soon as it hits it i get knock, That was on 110leaded, now on 91 oct. anything past 15psi and i get knock like 9-13 counts. I realize that +50% is shit load of fuel. but if i go lower i get knock, I got the 255 Fuel pump, 2G MAS, 43psi base idle with the "B&M" FPR.
What trips me out is that anything past 15 psi, i get knock. I keep 15psi up to 7+k without any knock, but not any higher psi.
Thanks

John
795/1000

[This message has been edited by khadiyev (edited 08-19-2002).]


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khadiyev
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Galant VR-4 org Post #: 51574 posted 08/20/02 08:51 AM     Remind Me!  Send Private Message   Edit Post      
anybody?
I guess all we talk about is white face guages, bodykits and shift boots.

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keydiver
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Galant VR-4 org Post #: 51575 posted 08/20/02 09:09 AM     Remind Me!  Send Private Message   Edit Post      
What turbo are you running?
Are you sure your base timing is close (5-8 BTDC)? And I don't mean according to the datalogger. I mean with the connector on the firewall grounded, and using a timing light.
I have a similar setup, but had NO knock on 100 octane fuel at 20psi. Of course, I don't take mine to 7K very often though.What cams are you running that pull to 7500 rpm?
Have the injectors been cleaned lately?

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BossGVR4
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Galant VR-4 org Post #: 51576 posted 08/20/02 09:52 AM     Remind Me!  Send Private Message   Edit Post      
How NEW is the knock sensor ?

Is it mounted correctly ... wires OK ?

DaveC


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khadiyev
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Galant VR-4 org Post #: 51577 posted 08/20/02 12:09 PM     Remind Me!  Send Private Message   Edit Post      
it's a 20G, 06 housing,
I checked the timing with the light it's exactly at 5deg btdc, with the plug grounded,
2 week old knock sensor, got the HK$ 264s cams, cleaned my injectors 2 weeks ago. Knock sensor screwed in to about 12-14lbs.

John


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keydiver
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Galant VR-4 org Post #: 51578 posted 08/20/02 12:24 PM     Remind Me!  Send Private Message   Edit Post      
Are you sure you're using the correct ECU, one thats intended for a 5-speed Turbo?
How about fuel restrictions, like a clogged filter, kinked hoses, etc?
I just can't see how you'd have ANY knock at only 21 psi with 110 octane!
Jeff O.
#1886/2000

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Dan D
220, 221... whatever it takes
410/2000


Galant VR-4 org Post #: 51579 posted 08/20/02 01:49 PM     Remind Me!  Send Private Message   Edit Post      
It is possible to cause detonation from overfueling. Do you have any logs we can look at?

Posts: 1147 | From: Brownsburg, IN | Member Since: 02/27/01 | IP: (12.222.102.136) | Report this post to a Moderator

Nate
May I have your autograph?


Galant VR-4 org Post #: 51580 posted 08/20/02 02:25 PM     Remind Me!  Send Private Message   Edit Post      
Too much fuel can make the car knock, bad knock sensor can cause the car to knock. Change the fuel filter lately? Change the sock on the bottom of the pump lately?

Posts: 944 | From: Worcester, Pa | Member Since: 02/23/01 | IP: (68.80.14.121) | Report this post to a Moderator

number3
Senior Member


Galant VR-4 org Post #: 51581 posted 08/20/02 03:13 PM     Remind Me!  Send Private Message   Edit Post      
BTW you really don't need to "run" past 7K. The peak power with stock intake manifold is 6500 ish.

Posts: 7623 | From: KoP, PA | Member Since: 06/26/01 | IP: (68.80.14.121) | Report this post to a Moderator

TeamDucktape
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Galant VR-4 org Post #: 51582 posted 08/20/02 05:00 PM     Remind Me!  Send Private Message   Edit Post      
Even with that big turbo you got? hehehe
What do you shift at Harry? When does your t4 bb come on? rpm wise.
Thanks,
Rob

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khadiyev
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Galant VR-4 org Post #: 51583 posted 08/20/02 07:54 PM     Remind Me!  Send Private Message   Edit Post      
The ECU is a Stage 3 from TMO, 3k on the fuel filter, cleaned the sock on the the bottom of the fuel filter about 4k ago. I have my pocketlogger log, also the dyno sheets, i don't know if i can upload them here or make a link, i don't have a webpage to store it on. But with the wide band 02, everything before 5k shows really rich,9:1, 10:1 area, but as soon as it reaches 12:1, 12.5:1 it gives me knock,and that's the leanes (ratio) though out th whole dyno chart. Oh yeah and the Intake manifold has been "extude honed" I bring it up that high so my boost stays up, i got petty bad lag on this turbo with 2.5inch exhoust full boost only by 4200-4500.
John

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Dan D
220, 221... whatever it takes
410/2000


Galant VR-4 org Post #: 51584 posted 08/20/02 08:01 PM     Remind Me!  Send Private Message   Edit Post      
What are your injector duty cycles? List them in ~1000 rpm steps for us. My thinking is that maybe your maxing really bad by jacking up the safc so much. Your spray pattern has probably gone all to hell with that much fuel added and the injectors are forced into 100% dty cycle earlier the rpm band.

If at 100% duty in your midrange, your spray pattern will be gone and may be creating hotspots inside the cylinder which rear there ugly head as pre-ignition/knock as pressure builds and rpms rise and timing advances.

Just a guess, of course if your dty cycles look fine then nevermind.


Posts: 1147 | From: Brownsburg, IN | Member Since: 02/27/01 | IP: (12.222.102.136) | Report this post to a Moderator

number3
Senior Member


Galant VR-4 org Post #: 51585 posted 08/20/02 08:09 PM     Remind Me!  Send Private Message   Edit Post      
quote:
Originally posted by Team Ducktape:
Even with that big turbo you got? hehehe
What do you shift at Harry? When does your t4 bb come on? rpm wise.
Thanks,
Rob

The turbo is a sore subject right now.

It hit about 3600.

Yeah the intake seems to bild power at 6500. I haven't proven this with tons of dyno runs of many cars but so far that looks to be true.


Posts: 7623 | From: KoP, PA | Member Since: 06/26/01 | IP: (68.80.14.121) | Report this post to a Moderator

khadiyev
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Galant VR-4 org Post #: 51586 posted 08/20/02 08:24 PM     Remind Me!  Send Private Message   Edit Post      
1st 23-26psi
6968rpm--26 counts of knock--11 deg,--0.78 O2,--17.436mS, (boost just goes up on me so i had to keep it part thorttle on ALL the runs, my TPS volts were average of 2.5, that's why the INJ mS is so low at that rpm.

2nd run.18-22psi
6k--24deg--0knock--0.76--22.821mS
65k-18deg--20knock-0.73--24.103mS

3rd run(21 psi blew IC pipe, no beed

0-6343rpm--0 knock 25deg of adv at 6300r's

02-- 5k -- .81 19deg inj-20.769mS
02-- 5.5k- .80 22deg inj-21.026mS
the last run i had no knock the whole time untill i blew IC pipe at 6300rpm


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Nate
May I have your autograph?


Galant VR-4 org Post #: 51587 posted 08/20/02 09:57 PM     Remind Me!  Send Private Message   Edit Post      
So just to be sure, you have changed the fuel filters to ensure that the leaning out isn't a delivery problem, right? That is pretty high ms numbers for the stock ECU, I don't usually see them go over 17ms anymore, no matter how much boost I'm running. If the pump isn't rewired, rewire it and hopefully gain a little additional pressure and some delivery, but I'd try to add fuel however you can at the rpm range where you're running so lean and getting knock.

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khadiyev
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Galant VR-4 org Post #: 51588 posted 08/20/02 10:02 PM     Remind Me!  Send Private Message   Edit Post      
pump is rewired!
and the AFC is MAXED OUT from 4k on it's +50%
he-he that's what trips me out. that's why i plannin on getting some 660, next week, and wanted to know if i need them.

John


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keydiver
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Galant VR-4 org Post #: 51589 posted 08/21/02 11:20 PM     Remind Me!  Send Private Message   Edit Post      
Maybe that boost creep could be part of the problem. If the ECU is only seeing 1/2 throttle, maybe its using overly aggressive timing, not to mention the low duty cycles on the injectors that cause you to jack the AFC up so high. I would fix the boost creep first, so you could run REAL wide-open-throttle logs and see what happens. If this is whats happening, I think 660's will only make it worse, even more aggressive timing advance.
Just another guess.......
Jeff O.
#1886/2000

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malcvr4
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Galant VR-4 org Post #: 51590 posted 08/21/02 02:52 PM     Remind Me!  Send Private Message   Edit Post      
quote:
Originally posted by khadiyev:
Ok, I got a set of RC550cc right now, i posted an article earlier about me dynoing my car. and getting HP:336 at 21-22 psi at the wheels, up to 7500rpms but then past that i just get crazy knock like 12-19 counts and my timing retards. Everything above 4k is +50% on the AFC. it goes fine before 7k but as soon as it hits it i get knock, That was on 110leaded, now on 91 oct. anything past 15psi and i get knock like 9-13 counts. I realize that +50% is shit load of fuel. but if i go lower i get knock, I got the 255 Fuel pump, 2G MAS, 43psi base idle with the "B&M" FPR.
What trips me out is that anything past 15 psi, i get knock. I keep 15psi up to 7+k without any knock, but not any higher psi.
Thanks

John
795/1000

[This message has been edited by khadiyev (edited 08-19-2002).]



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malcvr4
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Galant VR-4 org Post #: 51591 posted 08/21/02 02:58 PM     Remind Me!  Send Private Message   Edit Post      
Why do you have your fuel pressure so high? My car didnt run well until I lowered the pressure with a AFPR. And then I still had to lean the AFC to make power. I'm using the 550's, big 16g and 2nd Gen MAS. Are you sure you have to run +50%? When do your EGT's get too hot?

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khadiyev
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Galant VR-4 org Post #: 51592 posted 08/21/02 03:19 PM     Remind Me!  Send Private Message   Edit Post      
My EGT guage is not working right now, my needle keeps bouncing around,when roll the window up,or turn on a turn signal.
Keydiver! that's a VERY good guess.
I'll try to fix my boost creep and turn down the fuel pressure. I'll see what happens then.

Thank a lot for everybody's help!

John


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suprflewus
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Galant VR-4 org Post #: 51593 posted 08/21/02 09:30 PM     Remind Me!  Send Private Message   Edit Post      
what intercooler are you running???

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khadiyev
Unregistered


Galant VR-4 org Post #: 51594 posted 08/22/02 07:43 AM     Remind Me!  Send Private Message   Edit Post   
RRE kit(spearco)

John

[This message has been edited by khadiyev (edited 08-22-2002).]


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