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Old 05-22-2021, 11:06 PM   #1
K3rm1tth3fr0g
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Default Over-Revved EJ205 to 7800 - With Log

As the title suggests, I over-revved my USDM EJ205 with 66k miles when trying to downshift from 4th to 3rd, I missed and went into 1st, as you can infer from my actions, I am a certified genius and a professional WRC driver. I was not going very fast, maybe 40mph. It only was past redline for 3 cells in the log and then it dropped to 7000rpm. When at 7800 I was only at around ~7 psi.

Happens at line 884 in the included log.

I suppose the next step will just be a compression test before I get tuned for E85 in a few weeks as I planned but I am slightly worried.

Car seems to be running fine and still makes power. Although I know money-shifts can often be a long-term killer. I hope only 600RPM past fuel-cut isn't going to kill my motor but who knows.

Aside from a blackstone, compression, and potentially leakdown test, is there anything else I should check? I know the oil pump can get hurt from a money shift pretty easily.

Should I check timing?

Thanks all.
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Last edited by K3rm1tth3fr0g; 05-24-2021 at 09:45 AM.
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Old 05-23-2021, 08:38 PM   #2
Dave D.
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Ha, my friend, I'm guessing 7800rpm probably didn't do much if anything, I would definitely check the oil pressure, maybe get a Blackstone, perhaps consider a new oil pump when you get to Infront soon.

One motor back from my present one I did a 3-2 $$$hift at 75mph at 7700rpm on my jdm close-ratio 6-speed. I was not logging but calculated that the motor was spinning close to 10k for the part of a second before I could hit the clutch. Over time the oil pump failed, leading to a loss of pressure nearly a year later and engine failure.

A compression test is certainly a good idea but my guess is it should be fine. Good luck!
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Old 05-23-2021, 09:43 PM   #3
K3rm1tth3fr0g
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Originally Posted by Dave D. View Post
Ha, my friend, I'm guessing 7800rpm probably didn't do much if anything, I would definitely check the oil pressure, maybe get a Blackstone, perhaps consider a new oil pump when you get to Infront soon.

One motor back from my present one I did a 3-2 $$$hift at 75mph at 7700rpm on my jdm close-ratio 6-speed. I was not logging but calculated that the motor was spinning close to 10k for the part of a second before I could hit the clutch. Over time the oil pump failed, leading to a loss of pressure nearly a year later and engine failure.

A compression test is certainly a good idea but my guess is it should be fine. Good luck!
Ha. Thank you for the kind words to soothe my anxiety. Your thread regarding your money-shift experience is the first result when you Google money-shift NASIOC so I have been reading all morning through your threads and it appears your money-shift was significantly more violent.

Still though, I am sightly worried I jumped timing or shocked the oil pump. Oil pressure will be checked along with compression.

After a bunch of searching regarding the 205s revving ability, I am considering asking John what he thinks about slightly bumping up the redline since the 20G with the 10CM will need all the revs it can get (the 10cm housing 100% ensures spool will be at or after 4500 on the 2.0 even on E).

I saw a guy on here running a forged 205 with stock heads and he revved it out to 8K in the fully stock form because his GT35 was still making power up there despite the small cams and ports. But 8K seems pretty scary for stock 205 heads.... I was thinking maybe 7450-7500? Maybe it could squeeze out a little more because the turbo is so big? Especially on E85...

Last time John asked me out of 10 how aggressively I want the tune to be, I said 7. And for the ethanol tune this time, if the Blackstone and compression test come back good, I will likely say 9.

I am mainly worried slamming it into 1st at ~8K will damage something like the oil pump that failed in your instance.

I appreciate your encouraging statements and I will keep you all posted.

Last edited by K3rm1tth3fr0g; 05-23-2021 at 10:57 PM.
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Old 05-24-2021, 09:10 AM   #4
rtv900
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4 to 1????
man, how the heck did you miss a 4-3 shift
it's the easiest one of all
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Old 05-24-2021, 09:15 AM   #5
K3rm1tth3fr0g
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Originally Posted by rtv900 View Post
4 to 1????
man, how the heck did you miss a 4-3 shift
it's the easiest one of all
Haha good question. Still wondering that myself to be honest, must have been an absent-minded downshift. 1st feels so much further to the left compared to 3rd not sure how it could have psychically happened... Thankfully I wasn't at redline already

With the original trans that the car had it certainly wouldn't have been possible because it would have grinded gears from me going that fast but this 05 JDM WRX 4.44 5mt lets me put it into 1st at a much higher speed which is nice for not grinding gears but apparently not great for when I drive like a dumbass and slam it into 1st above 35mph

Last edited by K3rm1tth3fr0g; 05-24-2021 at 09:46 AM.
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Old 05-24-2021, 12:29 PM   #6
T-37
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Is your shift linkage in good shape? Side-to-side shifter play?
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Old 05-24-2021, 12:33 PM   #7
K3rm1tth3fr0g
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Originally Posted by T-37 View Post
Is your shift linkage in good shape? Side-to-side shifter play?

Used trans with 60k miles so it a has a bit of play but after the incident I don't notice any more play than before. Seems to be shifting smooth and crisp

I am considering replacing the linkage with this though. Should hopefully clean up some of the shifter slop.
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Old 05-24-2021, 02:46 PM   #8
T-37
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Used trans with 60k miles so it a has a bit of play but after the incident I don't notice any more play than before. Seems to be shifting smooth and crisp

I am considering replacing the linkage with this though. Should hopefully clean up some of the shifter slop.
I put one of those in my 5MT last year. It went from 1"+ side to side play down to zero for a while, and maybe 1/4" after it broke in a bit. Be aware you may have to clearance one of the bushings/crush sleeves slightly where it mounts to the clevis coming out of the transmission. It was about a .1 interference for my transmission, could have just been tolerance stack up.

I had a few misshifts before that drove me to finally go ahead with the install. It's a bit of a pain, but very worth it.
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Old 05-24-2021, 03:04 PM   #9
K3rm1tth3fr0g
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Originally Posted by T-37 View Post
I put one of those in my 5MT last year. It went from 1"+ side to side play down to zero for a while, and maybe 1/4" after it broke in a bit. Be aware you may have to clearance one of the bushings/crush sleeves slightly where it mounts to the clevis coming out of the transmission. It was about a .1 interference for my transmission, could have just been tolerance stack up.

I had a few misshifts before that drove me to finally go ahead with the install. It's a bit of a pain, but very worth it.
Thank you for your testimony. Reducing shifter play that much would be a game changer.

I will be putting one on the car shortly.

Will follow up with results.
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Old 06-17-2021, 10:18 AM   #10
K3rm1tth3fr0g
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Well Blackstone passed with flying colors.

However while draining and reusing the oil for this test, my highly intelligent self didn't realize the drain pan I used had dirt and debris in it, so the oil was contaminated (test sample was caught midstream and was therefore valid for testing purposes) and then put back into the engine and ran for 200 miles before I realized and drained it....

5QTs of Rotella and a blue OEM filter later and we are back to fresh oil.

I'll be doing a compression and leak-down test before my E85 tune in a few weeks so I'll let that determine if I tell my tuner to send it and tune at a 9/10 in aggressiveness.

However the debris in the oil definitely concerns me...

Will post another Blackstone in ~2K miles.

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