Extremely HOT bov / hot pipe temps

[rn240sx]

Ever since i went to a blow thru (maf) setup, i left the turbo intake side wide open with no pipe and no filter so now when u look at the turbo all u see is the wheel...After the 1st trial run of going blow thru i came home and popped the hood and went to adjust the bov cause it was fluttering, and when i went to touch it i almost burned my hand off. It was that HOT..!! I can recall doing trial runs when i 1st got my turbo kit using the normal suction maf and i had to adjust the bov as everyone does to get it right and it was NEVER this hot..I was told that now since the inlet is open with no pipe and filter, that im sucking in pure hot air off the manifold / engine bay... But b4 i had the intake pipe with maf and filter, but it was inside the engine bay, the air filter was never outside (cold air type). And my bov was never this hot.Could it be that im sucking in that much more hot air since the inlet is wide open..?? I dont see how a short 7 inch pipe with maf and filter could keep the temps down on the hot pipe...

[j-z]

nah, its prob just from doing hard runs and generating heat. having a filter on or not wont make a difference on how youve had it setup.

[MarkEmark]

Ever since i went to a blow thru (maf) setup, i left the turbo intake side wide open with no pipe and no filter so now when u look at the turbo all u see is the wheel...After the 1st trial run of going blow thru i came home and popped the hood and went to adjust the bov cause it was fluttering, and when i went to touch it i almost burned my hand off. It was that HOT..!! I can recall doing trial runs when i 1st got my turbo kit using the normal suction maf and i had to adjust the bov as everyone does to get it right and it was NEVER this hot..I was told that now since the inlet is open with no pipe and filter, that im sucking in pure hot air off the manifold / engine bay... But b4 i had the intake pipe with maf and filter, but it was inside the engine bay, the air filter was never outside (cold air type). And my bov was never this hot.Could it be that im sucking in that much more hot air since the inlet is wide open..?? I dont see how a short 7 inch pipe with maf and filter could keep the temps down on the hot pipe...

I doubt it has anything to do with changing the location of the MAFS, but it's probably not the best idea to run without an air filter. I can see not running one for a *little* extra flow, lets say on a short dyno run, but for daily driving?!?! The engine bay isn't a sealed vacuum of clean, pure, fresh air....I'd put a filter on that turbo immediately before you suck some unwanted debris in there and destroy something.

[KATwo40]

Agreed. Get a filter on there ASAP.

While you're at it, spend a little money and time and make yourself a CAI setup for it. You'll be happier this way.

[lilskyline240]

do you have a wideband to check if your running lean?? Lean causes very hot conditions

[rn240sx]

do you have a wideband to check if your running lean?? Lean causes very hot conditions

Well, i noticed that it went lean immediately after i did the blow thru setup. I figured that since the air was being BLOWN thru the maf, that would effect the a/f mixture. So i had to add 10% on the afc across the board the get it up to mid 10's... But when the maf was in the normal position (suction type) the a/f mixture was in the low 10's with the afc set at ZERO across the board, so i definitely know the blow thru changed the a/f mixture's.But for some odd reason the hot pipe is hotter than normal. I have adjusted the bov b4 during high high boost runs and i dont ever recall it being this hot to the point where i cant touch it...I was also told to do a cold air intake for the turbo inlet to help the temps but im not sure that would help any when the turbo is spooling up at 17 psi... thats alot of heat generated by the turbo itself, and that cooler air will just be heated up once it passes thru the compressor..

[lilskyline240]

idk then man...its a weird situation....get a intake temp gauge to see if your intake temps are really high?? check your intercooler to see if it has some blockage thats isnt allowing the air to cool off

[rn240sx]

idk then man...its a weird situation....get a intake temp gauge to see if your intake temps are really high?? check your intercooler to see if it has some blockage thats isnt allowing the air to cool off

Ive got the MDM and it shows the air intake temp at ~95 deg F and sometimes hotter when i 1st get on it. I have the factory temp sensor mounted after the maf and about 6 inches from the throttle plate. This way i can see what my intake temps are like..

[klattr1]

how hot has it been in florida lately?

[jpadilla12]

Right now, is just raining like crazy with the stupid tropical storm. It's usually around the mid 80's, low 90's when dry.

[rn240sx]

Right now, is just raining like crazy with the stupid tropical storm. It's usually around the mid 80's, low 90's when dry.

With a few spike's in the mid 90's... but this is not a DAILY driver.. Just a sat night driver only. And when i do drive it, its after 9pm so the temps are down in the 70's...Occasionally i will drive it to work just to get it out of the garage... but we are talking like once a week if that..

Maybe this is all normal and i never noticed it until now.. who knows..

[C-Kwik]

Depending on where you're BOV is, it may be subject to seeing hot air pass through it. Particularly if it is before the I/C. Depending on the boost pressure, the temp can easily reach a couple hundred degrees.

While unlikely to get as hot, a BOV mounted aft of the I/C could be heated by the air in the intake. I/C's also act as heatsinks and will actually heat intake air when off boost as the I/C will be a higher temp then the air going through it when off boost after a few boost runs. I doubt it would get hot enough to nearly burn you though. I'd speculate the first theory of mine to be more likely though.

[rn240sx]

Depending on where you're BOV is, it may be subject to seeing hot air pass through it. Particularly if it is before the I/C. Depending on the boost pressure, the temp can easily reach a couple hundred degrees.

Now that u mention it, the bov was on the cold pipe b4 i did this blow thru setup. Which explains why it was not as hot after a few boost runs or steadily cruising...

Now that the bov is right after the compressor which gets really hot, that would explain why the bov is hot... Cause i know when i touch the bov, its HOT and when i touch the maf... its not as hot (after the IC)