EJ20G failure... Why?
#1
Hi:
One of my mates, who have a Legacy RS, had blown his engine. After a couple of minutes of hard driving (about 200 km/h in fifth gear with 20 psi of boost, a looong straight road of course :-) the engine begun with a little "clank clank" sound.
The car was turned off and was stopped a for some hours. Later it was drived in a normal fashion until the suddenly engine turned off feeling "stuck".
Well, finally one conrod bearing was melted and the conrod damaged too. This is not the first time that I know a similar failure, so
Why this could Happened? Stress?, Lubrication problem?, Both?
Any idea?
Regards from Chile
One of my mates, who have a Legacy RS, had blown his engine. After a couple of minutes of hard driving (about 200 km/h in fifth gear with 20 psi of boost, a looong straight road of course :-) the engine begun with a little "clank clank" sound.
The car was turned off and was stopped a for some hours. Later it was drived in a normal fashion until the suddenly engine turned off feeling "stuck".
Well, finally one conrod bearing was melted and the conrod damaged too. This is not the first time that I know a similar failure, so
Why this could Happened? Stress?, Lubrication problem?, Both?
Any idea?
Regards from Chile
#5
You're right, sorry, here I go:
Legacy/Liberty RS MY93
Engine: EJ20G Open deck
Mods:
- 3" Exhaust and Banzai muffler
- HKS Super mega flow Air filter
- MRT Fuel Cut defender
- Walbro 255 lts/h Fuel Pump
- Aeromotive Fuel Pressure Regulator
- IHI VF22 Turbo
- S-AFC
- Greddy Profec B boost controller setted to 20 psig in high mode, 15 in low
More facts:
This car wasn't driving at 20 psi everytime, just at "special" events only.
The AF gauge always show the last green led when the car was in WOT (I think the car was always overfueled)
Beside, when the engine was opened, the pistons were in very good conditions, there wasn't any sign of damage.
Ideas?
Regards from Chile
Legacy/Liberty RS MY93
Engine: EJ20G Open deck
Mods:
- 3" Exhaust and Banzai muffler
- HKS Super mega flow Air filter
- MRT Fuel Cut defender
- Walbro 255 lts/h Fuel Pump
- Aeromotive Fuel Pressure Regulator
- IHI VF22 Turbo
- S-AFC
- Greddy Profec B boost controller setted to 20 psig in high mode, 15 in low
More facts:
This car wasn't driving at 20 psi everytime, just at "special" events only.
The AF gauge always show the last green led when the car was in WOT (I think the car was always overfueled)
Beside, when the engine was opened, the pistons were in very good conditions, there wasn't any sign of damage.
Ideas?
Regards from Chile
#6
Scooby Regular
Join Date: Apr 2003
Location: Cambridgeshire
Posts: 1,541
Likes: 0
Received 0 Likes
on
0 Posts
So the car has an SAFC (Fuel Controller) but no form of ignition control? ie Re-mapped ECU, Standalone ECU? IMO running this amount of boost with no ignition modifications is a recipe for detonation. Is the car also using the standard intercooler/chargecooler and what Octane fuel was he using?
Cheers
Cheers
Trending Topics
#8
Hi:
Well, here in Chile, there isn't any real tuner, so the only "kind" of electroning tuning is by using S-AFC and AVC-R... neither nobody have a Wide band Oxygen sensor or a something as a Knock link.
We're not as lucky as another places. At the other hand, the maximum RON value is 97 which and always was used for this car.
Also we never heard any detonation, but we never measure the EGT. By the way, Does anyone knows what are the tolerable values for EGT's?
Regards from Chile
Well, here in Chile, there isn't any real tuner, so the only "kind" of electroning tuning is by using S-AFC and AVC-R... neither nobody have a Wide band Oxygen sensor or a something as a Knock link.
We're not as lucky as another places. At the other hand, the maximum RON value is 97 which and always was used for this car.
Also we never heard any detonation, but we never measure the EGT. By the way, Does anyone knows what are the tolerable values for EGT's?
Regards from Chile
Thread
Thread Starter
Forum
Replies
Last Post
supermoose
General Technical
6
31 March 2009 06:12 PM
supermoose
General Technical
1
19 March 2007 10:03 PM