AES 408 with PT91.5
10-25-2013, 12:06 AM
#41
Hell, I got crazy with a tuneup one time and pushed water so bad it was running down the side of the block on only 14 psi. Does that mean the limit is now 14 psi. I think not.
10-25-2013, 06:47 AM
#42
^ this post has made the most sense. Ive always read its cylinder pressure that causes heads to lift and cylinders to expand not boost pressure.
22 psi is not the pressure against the head either. Boost pressure is manifold pressure, not cylinder pressure.
22 psi is not the pressure against the head either. Boost pressure is manifold pressure, not cylinder pressure.
10-25-2013, 02:49 PM
#44
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Its all about mass flow, lb/min you can use the compare feature on garretts website to see what two turbos will flow in lb/min. And you will notice there is quite a large difference in mass flow between a 4202 and a 5543 at a pr of 2.5.
As for the op, like others stated check on the compressor side to see if oil was getting past on the other side as well.
As for the op, like others stated check on the compressor side to see if oil was getting past on the other side as well.
Actually cylinder pressure is what lifts heads. A good/bad tune up and fuel can make or break a combo regarding head lifting. It's not all about a boost number. Matter of fact, giving a boost number "only" in reference to head lifting problems is just plain stupid. I've ran many a combo over 22 psi on 4 bolt stuff and it did just fine.
Hell, I got crazy with a tuneup one time and pushed water so bad it was running down the side of the block on only 14 psi. Does that mean the limit is now 14 psi. I think not.
Hell, I got crazy with a tuneup one time and pushed water so bad it was running down the side of the block on only 14 psi. Does that mean the limit is now 14 psi. I think not.
10-26-2013, 09:00 AM
#51
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Im going to throw this out there....
Id guess that AES or ANY OTHER engine shop gets 100 phone calls a day from idiots asking if they build a motor, "how much psi can i run", ****, just look at the damn forum we are on? over run with the same questions, day in and day out...
Lets just assume for a second, these morons that call in ask this question, ask the same way most of the people on this board do...
"If i put a 70 or 76mm turbo on my car, how much psi can i throw at before the heads lift"
Then, i could probably see why they come up with this blanket statement....Is it 100% true... NO, not at all. Is it pretty close for 90% of applications? Probably so for most of these street cars.
Kind of like being a used car salesman... tire kickers everywhere....Somedays you just get tired of it and shove them off...
if you didnt agree with what he said, then why not question him on it?
Just my .02
I did, i questioned the **** out of them on every single thing they said to me... I still bought my motor from them...
Id guess that AES or ANY OTHER engine shop gets 100 phone calls a day from idiots asking if they build a motor, "how much psi can i run", ****, just look at the damn forum we are on? over run with the same questions, day in and day out...
Lets just assume for a second, these morons that call in ask this question, ask the same way most of the people on this board do...
"If i put a 70 or 76mm turbo on my car, how much psi can i throw at before the heads lift"
Then, i could probably see why they come up with this blanket statement....Is it 100% true... NO, not at all. Is it pretty close for 90% of applications? Probably so for most of these street cars.
Kind of like being a used car salesman... tire kickers everywhere....Somedays you just get tired of it and shove them off...
if you didnt agree with what he said, then why not question him on it?
Just my .02
I did, i questioned the **** out of them on every single thing they said to me... I still bought my motor from them...
10-26-2013, 09:22 AM
#52
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Im going to throw this out there....
Id guess that AES or ANY OTHER engine shop gets 100 phone calls a day from idiots asking if they build a motor, "how much psi can i run", ****, just look at the damn forum we are on? over run with the same questions, day in and day out...
Lets just assume for a second, these morons that call in ask this question, ask the same way most of the people on this board do...
"If i put a 70 or 76mm turbo on my car, how much psi can i throw at before the heads lift"
Then, i could probably see why they come up with this blanket statement....Is it 100% true... NO, not at all. Is it pretty close for 90% of applications? Probably so for most of these street cars.
Kind of like being a used car salesman... tire kickers everywhere....Somedays you just get tired of it and shove them off...
if you didnt agree with what he said, then why not question him on it?
Just my .02
I did, i questioned the **** out of them on every single thing they said to me... I still bought my motor from them...
Id guess that AES or ANY OTHER engine shop gets 100 phone calls a day from idiots asking if they build a motor, "how much psi can i run", ****, just look at the damn forum we are on? over run with the same questions, day in and day out...
Lets just assume for a second, these morons that call in ask this question, ask the same way most of the people on this board do...
"If i put a 70 or 76mm turbo on my car, how much psi can i throw at before the heads lift"
Then, i could probably see why they come up with this blanket statement....Is it 100% true... NO, not at all. Is it pretty close for 90% of applications? Probably so for most of these street cars.
Kind of like being a used car salesman... tire kickers everywhere....Somedays you just get tired of it and shove them off...
if you didnt agree with what he said, then why not question him on it?
Just my .02
I did, i questioned the **** out of them on every single thing they said to me... I still bought my motor from them...
10-27-2013, 12:21 AM
#53
Im going to throw this out there....
Id guess that AES or ANY OTHER engine shop gets 100 phone calls a day from idiots asking if they build a motor, "how much psi can i run", ****, just look at the damn forum we are on? over run with the same questions, day in and day out...
Lets just assume for a second, these morons that call in ask this question, ask the same way most of the people on this board do...
"If i put a 70 or 76mm turbo on my car, how much psi can i throw at before the heads lift"
Then, i could probably see why they come up with this blanket statement....Is it 100% true... NO, not at all. Is it pretty close for 90% of applications? Probably so for most of these street cars.
Kind of like being a used car salesman... tire kickers everywhere....Somedays you just get tired of it and shove them off...
if you didnt agree with what he said, then why not question him on it?
Just my .02
I did, i questioned the **** out of them on every single thing they said to me... I still bought my motor from them...
Id guess that AES or ANY OTHER engine shop gets 100 phone calls a day from idiots asking if they build a motor, "how much psi can i run", ****, just look at the damn forum we are on? over run with the same questions, day in and day out...
Lets just assume for a second, these morons that call in ask this question, ask the same way most of the people on this board do...
"If i put a 70 or 76mm turbo on my car, how much psi can i throw at before the heads lift"
Then, i could probably see why they come up with this blanket statement....Is it 100% true... NO, not at all. Is it pretty close for 90% of applications? Probably so for most of these street cars.
Kind of like being a used car salesman... tire kickers everywhere....Somedays you just get tired of it and shove them off...
if you didnt agree with what he said, then why not question him on it?
Just my .02
I did, i questioned the **** out of them on every single thing they said to me... I still bought my motor from them...
