DIY Turbo install in progress

[ehrnst]

Aftermarket EMS, guessing megasquirt. using map

[TORITO]

Looks really good man. What are you doing for an EMS? I have a t3/t04e .63 exhaust and 57 trim wheel with the volk adapter and a tial 38. I have a HKS SSQV (Lazer) though. Should be a lot of fun.

Where did the air flow sensor go?, don't you need it?

[91greg325i]

Haha. Might as well resurrect this thread. Any progress made? One of the most detailed starts to a turbo project I've seen in a while...

[deutschman]

man thanks for the DIY. just read the whole thing and subscribed. i hope to be doing a turbo build hopefully by next summer with the stage 2 kit offered by Dederic Motorsports. this thread has and will help me a lot.

[Jamster]

any updates?

[chrise30]

nice job

[J-tec]

Wow great DIY you got going on here, read the whole thing

I'll be watching this thread for sure

[aznbo187]

Hello Derek.


fail.

[blueapplesoda]

Hi, turbo n00b here. Don't mean to interrupt the discussion on BOV's, but I'm confused as to where the AFM and Idle Air Control valve went. Are they not needed in a turbo settup? Does having a fuel management system eliminate the need for those parts? Thanks.

If the OP is using a speed density/alpha-n type engine management that replaces the stock ecu, than he doesn't need them.

Derek

[ubernasty]

nice build... not sure why you keep dodging the question on what your doing about fuel/spark though? no idea yet eh? lol

[EvoStevo]

Hi, turbo n00b here. Don't mean to interrupt the discussion on BOV's, but I'm confused as to where the AFM and Idle Air Control valve went. Are they not needed in a turbo settup? Does having a fuel management system eliminate the need for those parts? Thanks.

[Devil Inc]

Most race applications don't utilize a BOV. But then again those applications don't see on/off the throttle like a daily driver would.

[norcalE30]

i helped with a few turbo builds at Tri-Star where i used to work. i havent seen the effects of turbo surge because we built them properly. Im sure you can mount the BOV anywhere after the turbo, but they are more effective when mounted near the TB, because as you said the air doesnt have to change directions (thank you for agreeing.)

i get what youre saying, and it makes sense. but mounting the BOV near the TB is just more effiecient. the little strain that is applied to the turbo during the milliseconds it would take for the BOV to open and relieve pressure isnt even measurable. better to protect the expensive engine than take caution against something thats almost irrelevant

[ForcedFirebird]

when the butterfly closes rapidly at high boost excess pressure builds up between the turbo and the throttle body. without a BOV this would severly damage the TB and possibly the engine as well. this can also happen during a spike in boost (surge). BOVs are there to protect the engine, which is why they are located near the intake, not near the turbo. the air in a turbo system is never "static" its always being moved in one way or another.

And you have experience with this? You have built turbo kits and seen the effect of said "surges" or "spikes" that you are talking about? Have you ever adjusted a BOV to work properly, or listened to an incorrecly adjusted BOV surge?


The BOV is located near the TB to keep the air moving in the same direction. IN THEORY this is so that the air moving towards you engine from the turbo won't have to go the opposite direction to be released through the BOV, even though I have seen the BOV placed on the intercooler, or near the compressor due to space, and the system worked flawlessly.

Air most certainly CAN become static in a turbo system. If the turbo is blowing air into a closed area, it has no where to go and will become static. Then you have the compressor that's still trying to pump air into that location, you are causing the compressor wheel to slow down, in turn slowing your turbine causing restriction.


I'm not talkin out the side of my head here, either. I'm working on my 4th turbo kit in about a year's time. One consists of a 12 second 1994 V6 Chevy Corsica...

[norcalE30]

when the butterfly closes rapidly at high boost excess pressure builds up between the turbo and the throttle body. without a BOV this would severly damage the TB and possibly the engine as well. this can also happen during a spike in boost (surge). BOVs are there to protect the engine, which is why they are located near the intake, not near the turbo. the air in a turbo system is never "static" its always being moved in one way or another.