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Old 04-09-2013, 01:08 AM   #1
rushdylan
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Default tuning my sti swapped bugeye with no AVCS

i just finished swapping my ej257 swap into my bugeye. it runs and everything is good but it needs a tune! my tuner (guy i bought the motor from) had always done tactrix/romraider open source tuning but recently switched to cobb. that really means nothing because my real question is there any difference in tuning when my avcs is not functioning? i dont have the sti throttle body, body harness, engine harness, or any other part required for AVCS. just the solenoids on the motors which are not connected to any plugs. my tuner asked me to do some research to see if there was any differences or problems and he said it could cause cam lobe wear (not sure? i dont see why it would happen) so any input would be great. he will be tuning mine on open source.
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Old 04-10-2013, 09:48 AM   #2
rushdylan
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no input?
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Old 04-10-2013, 07:55 PM   #3
Franko
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I wouldn't do any tuning in that configuration, since the cams could be in any position. I don't know what happens to them when they aren't hooked up but still have oil pressure. I sure wouldn't leave it like that.

Ive seen non avcs cams on sti's before but im not sure if it was wrx heads or not.

Avcs makes a huge difference man. I would definitely look into hooking that up.
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Old 04-11-2013, 01:16 AM   #4
mikeydrives1
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AVCS is to STi motors as VTEC is to a Honda's K20 . Their 2 different performance enhancing functions, however the motors arent nearly as capable for power without them in either case.

i would SERIOUSLY reconsider getting the AVCS hooked up. It will give you immense amounts of pickup and torque at the low end. Otherwise its all just top end power.
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Old 04-11-2013, 05:02 PM   #5
rushdylan
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Quote:
Originally Posted by mikeydrives1 View Post
AVCS is to STi motors as VTEC is to a Honda's K20 . Their 2 different performance enhancing functions, however the motors arent nearly as capable for power without them in either case.

i would SERIOUSLY reconsider getting the AVCS hooked up. It will give you immense amounts of pickup and torque at the low end. Otherwise its all just top end power.
ill definitely have to look for pedals and a body harness/ECU to get it working. thanks for the input everybody
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Old 04-11-2013, 06:46 PM   #6
mikeydrives1
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Look at it this way. Its the difference between getting say, a 16 or 18 G to spool before 4000rpm, or after, like.. way after. When my AVCS went bad one day (disables it for safety) , my car wasnt hitting boost until 4500 with a TD05h (68HTA). Ive ridden in cars with larger turbos and no AVCS and the boost just feels so slow to kick in. With the AVCS diale in, i have boost hitting target at 3400 rpm. It makes a world of a difference.
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Old 04-12-2013, 01:04 AM   #7
lancelucas
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I think the *need* for AVCS is being overstated a bit. It's certainly nice to have but cars ran just fine for a long time without variable cam phasing. There are plenty of built STis that that can't even use it any more due to the extreme lift/duration/valve combos being run in some motors. I would think very carefully about a bulkhead harness swap before deciding to do one for the sole purpose of gaining AVCS.
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Old 04-12-2013, 08:51 AM   #8
dux10
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can't he buy the pigtail adapters and wire it to the ecu then use a jdm ecu?
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Old 04-12-2013, 08:57 AM   #9
endrswrd
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Quote:
Originally Posted by dux10 View Post
can't he buy the pigtail adapters and wire it to the ecu then use a jdm ecu?
You can if you were running JDM avcs. There is more advance(40 degrees?) in the jdm AVCS then the USDM avcs so they are slightly different. I dont know if the JDM ecu could actuate the USDM avcs as I know the actuators are slightly different. Id imagine as long as they can control them then you would be in business regardless of their max advance though. Best bet would be to use an STi ECU (probably an 04 so there is no immobilizer) and replace the harness. You could also throw in the cluster and be ready for a 6 spd swap w/ full DCCD.
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Old 04-14-2013, 09:42 AM   #10
cowboy_Rob
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My car was tuned and running fine that way for years. I did however find out that it leaves the intake cam timing retarded 6 degrees if your using the avcs gears because of the base position. Best thing to do is plug the oil holes at the end of the cams and use wrx gears.
Yes it's slightly laggyier then having avcs but its not as bad as some if these guys are implying. I was running a Fp red with a giant aps ds500 fmic making 25 psi before 4500.

On this rebuild though I got bigger cams and an going to use wrx gears so the timing is correct
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Old 04-14-2013, 07:59 PM   #11
kellygnsd
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Quote:
Originally Posted by cowboy_Rob View Post
My car was tuned and running fine that way for years. I did however find out that it leaves the intake cam timing retarded 6 degrees if your using the avcs gears because of the base position. Best thing to do is plug the oil holes at the end of the cams and use wrx gears.
Yes it's slightly laggyier then having avcs but its not as bad as some if these guys are implying. I was running a Fp red with a giant aps ds500 fmic making 25 psi before 4500.

On this rebuild though I got bigger cams and an going to use wrx gears so the timing is correct
I'm kellygnsd and I approve this message.
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Old 04-15-2013, 11:20 AM   #12
rushdylan
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Quote:
Originally Posted by lancelucas View Post
I think the *need* for AVCS is being overstated a bit. It's certainly nice to have but cars ran just fine for a long time without variable cam phasing. There are plenty of built STis that that can't even use it any more due to the extreme lift/duration/valve combos being run in some motors. I would think very carefully about a bulkhead harness swap before deciding to do one for the sole purpose of gaining AVCS.
I also agree
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