Doh! (I'm not afraid to look like an idiot.)

Jeffman

Captain
Jan 7, 2017
1,009
Every time I think about installing catless downpipes I’m always reminded about what a total PITA it is to do it on a 335xi because one needs to drop the subframe. Are downpipes really worth the hassle? You get, what, maybe an additional 20hp?
 
Last edited:
  • Like
Reactions: doublespaces

Itsbrokeagain

Corporal
Jan 28, 2018
150
Strong Island
I actually do have the log. I didn’t think it was the boost pressure in the intake that caused it to explode. The throttle blade closed so the motor didn’t see the boost pressure. Something caused some kind of backfire. Not really sure what still. Port injection wasn’t hooked up or anything.

https://datazap.me/u/cd919/intake-mani-explosion?log=0&data=3-6-23&solo=3-6





True. It’s funny to look back at it now. I wish I could have seen my own face. Lol
did it clean the ports of all the carbon build up while it exploded? Kill two birds with one stone LOL
 

Narcosis

Specialist
Dec 14, 2016
75
Hudson, WI
I popped the engine in my Supra while on the dyno, playing with a 100 shot of nitrous on an otherwise stock configuration. The #5 rod let go and punched holes in both sides of the block. :)

The 2jz is known to be pretty bullet proof, but it's not idiot proof. I'd installed the nitrous kit without a window switch, or any other type of safeguard, and went WOT in 4th gear around 2500 rpm. Torque went from sub-50 ft/lbs to 430 ft/lbs within 600 rpm. Kaboom. Long story short, I was able to rebuild with a new OEM shortblock, get the head refreshed, bolt on the mods I wanted (no nitrous this time around) and the car went on to make around 750 bhp.

block2.jpgbent rod.jpgwrist pin.jpgpiston-sideview.jpgburnout.jpg
 
Last edited:

Narcosis

Specialist
Dec 14, 2016
75
Hudson, WI
Every time I think about installing catless downpipes I’m always reminded about what a total PITA it is to do it on a 335xi because one needs to drop the subframe. Are downpipes really with it? You get, what, maybe an additional 20hp?
Oh HELL yes. :)
 

veer90

Lieutenant
Nov 16, 2016
862
West Nyack, NY
I tried a new wiring harness setup for my DIY stage 4 (450 + 525). I'll post a thread on it later but when I jumped the hobbs switch as a test, 5 seconds later the EKP was dead.

Sat there cranking the car for 20+ seconds before realizing I had no fuel pressure. Hardwired both pumps and all was good.
 

Boorda

Specialist
Jul 15, 2018
95
Royse City, TX
Every time I think about installing catless downpipes I’m always reminded about what a total PITA it is to do it on a 335xi because one needs to drop the subframe. Are downpipes really worth the hassle? You get, what, maybe an additional 20hp?
Yassss.... And you might as well go ahead and do all the other maintenance that requires dropping the subframe.
Such as... (N55 parts listed)
 
  • Like
Reactions: Jeffman

Jeffman

Captain
Jan 7, 2017
1,009
Here’s another one from me:

I installed new charge pipe and TIAL-Q BOV in April.

Started to get 30FF code in May. Ignored it while I worked on passing OBDII emissions readiness.

Passed emissions with my FlexFuel tune installed. Fast-forward to June. Now it’s time to have fun ... but where’s my boost? Damn 30FF. I should be getting 22-24 psi but only getting 15-16 psi. Turbos spool quickly but clearly not reaching target and throwing 30FFs.

Read all the DIYs and started to first check my vacuum system and operation of the Waste gates using syringe to create vacuum, monitoring vacuum pressures supplied to the waste gates at idle and under WOT with the gauge routed up through the driver’s window, etc.

Removed the DCIs to pressure test the air intake, installed the PVC plugs, when all of a sudden I see these two holes:


ADF1B6B8-5B46-4089-A547-FCF14246CC46.jpeg


LOL!
I forgot to plug the damn meth ports! I’ve been driving like this for two months.

Interestingly, this tells you that stock turbos will still boost 15 psi at 100% WGDC with two holes this large in the charge pipe.
DOH!

Added the plugs and all is well. :relaxed:
0F37C94F-4EDF-471E-B69C-3BA2466D781B.jpeg
 
  • 2Funny
Reactions: NoQuarter and Boorda
Top