Just leak tested the car, and it's leaking pretty bad in a couple spots.
#1
Just leak tested the car, and it's leaking pretty bad in a couple spots.
Well, I just tested my and I have 2 pretty bad leaks, at least I think they are bad. One is at my iat sensor and the other is at the proflo valve. I wanted to change both anyways, so I'll kill two birds with one stone. My IAT is slow as dirt to respond. It doesn't even react to methanol being sprayed on it.
Anyway, here's my video. I set the pressure to 17-18psi and it's pretty loud the leaks. I'm wondering how much boost I'm losing between the two leaks.
Anyway, here's my video. I set the pressure to 17-18psi and it's pretty loud the leaks. I'm wondering how much boost I'm losing between the two leaks.
Last edited by The Alchemist; 12-27-2013 at 08:02 AM.
#6
TECH Addict
iTrader: (7)
Yea at that pressure you have some significant leaks. As to how much you are losing, we could both do some fancy engineering calcs to figure it out but in the, you will just fix the leaks and log the results . I asked the question to make sure you weren't pushing 50+ psi through everything.
#7
Yea at that pressure you have some significant leaks. As to how much you are losing, we could both do some fancy engineering calcs to figure it out but in the, you will just fix the leaks and log the results . I asked the question to make sure you weren't pushing 50+ psi through everything.
I started with the regulator completely closed, then slowly started opening the regulator till I hit just a tad over 15 psi, and not yet 20psi. It's one of those that goes up to 200psi, so at 15-20psi, it's not entirely accurate.
So is this a fast responding iat sensor?
http://www.summitracing.com/parts/dfp-ts10077/overview/
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#9
One thing I'll do today is turn on the ignition to get a reading from the map sensor to see how much boost the manifold is seeing. I'll also investigate the proflo to make sure it's closing completely. I thought there was an adjustment on it. Maybe it's not closing all the way.
#10
Staging Lane
Iam just guessing but wont there be a leak at the open valve on any given cylinder through the intake manifold? No way every valve can be closed on every cylinder unless the camshaft isnt in the car. This car isnt taken apart so the cam must be in the car. Maybe iam missing something.
#11
Iam just guessing but wont there be a leak at the open valve on any given cylinder through the intake manifold? No way every valve can be closed on every cylinder unless the camshaft isnt in the car. This car isnt taken apart so the cam must be in the car. Maybe iam missing something.
You're right, in theory... that at the specific point of valve overlap, you will have an open intake valve and exhaust valve, so you could lose air there. Remember though, that lifters are hydraulic, and bleed down over time, so there's a good chance that the little bit of overlap will actually bleed down and the valves will close. Maybe not 100% but that's ok. I'm still hearing and feeling a massive leak from the IAT sensor and the proflo valve, both of which need to be replaced, so it's not a huge concern.
#12
FormerVendor
I would guess manifold pressure was close to zero (assuming the throttle blade was closed during the test). That would explain the bypass valve leak but let me know what you find.
#13
The manifold was definitely pressurized, I tried it again yesterday and confirmed via hptuners that it was at 208kpa, or 16psi. I opened and closed the throttle body and the manifold was charged with plenty of pressure.
I manually checked the proflo and there was air being pushed past the butterfly valve. I was able to manually open and close the valve and the pressure was closing the valve, its just blowing air past the valve. I pulled the valve out and checked it, and its just leaking. I think at 10 to 12 psi its fine, it just can't hold 15+ psi of boost, so its being replaced with a TiAL. I'm alos replacing the iat sensor with a bung and screw in sensor.
I don't know how much air was leaking, but it was a fair amount.
I manually checked the proflo and there was air being pushed past the butterfly valve. I was able to manually open and close the valve and the pressure was closing the valve, its just blowing air past the valve. I pulled the valve out and checked it, and its just leaking. I think at 10 to 12 psi its fine, it just can't hold 15+ psi of boost, so its being replaced with a TiAL. I'm alos replacing the iat sensor with a bung and screw in sensor.
I don't know how much air was leaking, but it was a fair amount.
#16
Just for clarification, this is the bypass valve that I'm talking about:
http://procharger.com/store/index.ph...d&productId=20
It's a butterfly valve just like a throttle body, and with it fully closed, air gets by. Too much for my liking.
http://procharger.com/store/index.ph...d&productId=20
It's a butterfly valve just like a throttle body, and with it fully closed, air gets by. Too much for my liking.
#17
TECH Enthusiast
I know you don't want to do this with your fast intake, but I have my iat threaded into the back of my ls6. That way I can tell how hot the air is in the back cylinders. I'll have to check which sensor I'm using but it is a threaded one and changes as soon as the meth comes on. I'm curious to hear how the tial sounds compared to my race valve.
#18
TECH Apprentice
iTrader: (7)
Alchemist
This is what you need, This screws in and seals/works well, and its plug and play.
http://shop.advanceautoparts.com/web...GRPSENSAMS____
This is what you need, This screws in and seals/works well, and its plug and play.
http://shop.advanceautoparts.com/web...GRPSENSAMS____
#19
9 Second Club
Just for clarification, this is the bypass valve that I'm talking about:
http://procharger.com/store/index.ph...d&productId=20
It's a butterfly valve just like a throttle body, and with it fully closed, air gets by. Too much for my liking.
http://procharger.com/store/index.ph...d&productId=20
It's a butterfly valve just like a throttle body, and with it fully closed, air gets by. Too much for my liking.