That's a lot less air volume. 
Diesel vs gas engine?
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 56
Likes: 0
From: coldspring, tx
Diesel vs gas engine? Could somebody explain to me why gas engines are able to run so much larger turbos than gas engines? For instance my brother just ordered a 62mm turbo for his truck and it is going to be on the large side for his truck until he gets even bigger injectors but almost every build I see on her is using a 78mm or larger turbo. Also what egt's do turbo gas engines usually run?
Thats why I tun an hx40 (16) and an ht3b (26) on my 3500 rpm cummins.......lol
I run a bit of fuel to it too though.
The reason for the op is that basically most people that have diesels, just get the "kit" set up and they themselves dont actually do anything themselves to their own stuff. They people that do it themselves, will find a way......the ones that dont.....get what makes the seller money and gives the buyer enough. Enough depends on the buyer, and now days, way more people dont test their rides then the ones that do, so enough on the but meter is pretty easy to achieve.
I run a bit of fuel to it too though.
The reason for the op is that basically most people that have diesels, just get the "kit" set up and they themselves dont actually do anything themselves to their own stuff. They people that do it themselves, will find a way......the ones that dont.....get what makes the seller money and gives the buyer enough. Enough depends on the buyer, and now days, way more people dont test their rides then the ones that do, so enough on the but meter is pretty easy to achieve.
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 56
Likes: 0
From: coldspring, tx
But both gas and diesel spool their turbos way before idle.
What about smaller displacement gas engines surely even with high rpms they are not moving as much air as a 5.9 cummins which is the smallest factory turbo diesel I can think of
What about smaller displacement gas engines surely even with high rpms they are not moving as much air as a 5.9 cummins which is the smallest factory turbo diesel I can think of
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Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 56
Likes: 0
From: coldspring, tx
Also why Is it that diesels run extra high body pressures, sometimes in excess of 70psi on their 70-80mm turbos but gas engines generally run relatively low psi with turbos in excess of 100mm
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Verdad Gallardo wait why do you think they spool slow? and they run smaller turbo's because they arent making massive amounts of power...
ex: a 62mm turbo on your brothers diesel is going to make about the same power "maxed" out as it would on an ls1, though theres other variables on the exhaust side to take into account.
as for the insanely high boost pressures, its because they're running compound turbos. 30psi+40psi = 70.
ex: a 62mm turbo on your brothers diesel is going to make about the same power "maxed" out as it would on an ls1, though theres other variables on the exhaust side to take into account.
as for the insanely high boost pressures, its because they're running compound turbos. 30psi+40psi = 70.
Thread Starter
Staging Lane
Joined: Feb 2010
Posts: 56
Likes: 0
From: coldspring, tx
What I don't understand is how my 5.7 ls1 could be efficient with that turbo but it's going to be a bit big for his 5.9
Is it being a diesel that makes the difference or just the rpms?
Is it being a diesel that makes the difference or just the rpms?
Higher CR will spool the turbo faster.
Smaller RPM range, smaller turbo.
Air and fuel vs. air/spark/and fuel makes a lot simpler combo.
Diesels are easy, FI on a gas car is alot harder
Smaller RPM range, smaller turbo.
Air and fuel vs. air/spark/and fuel makes a lot simpler combo.
Diesels are easy, FI on a gas car is alot harder
