Differnce between a towing turbo and a racing turbo
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Muted one day, Banned the next....... Ah the life of a DTR 1%'er
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From: Ohio: Home of the disappointing sports teams
Differnce between a towing turbo and a racing turbo
What are the main differences between a towing turbo and a racing turbo?
I'm possibly looking to get a larger turbo but I have no idea what to look for. I tow frequently (upwards to 25,000 gcw) but I also like to play. I their one for both?
I'm possibly looking to get a larger turbo but I have no idea what to look for. I tow frequently (upwards to 25,000 gcw) but I also like to play. I their one for both?
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Joined: Jan 2004
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From: Maritimes, Canada
A racing turbo will have a larger compressor(cold) and turbine(hot) side than a towing turbo. It will take longer to spool and will not get fully on its map till higher boost levels. At low boost levels and every spool up you will smoke alot. It will of course flow alot more air in and out at higher fueling levels and especially rpms. To daily drive a larger turbo you have to either keep the fueling higher or the rpms higher or both.
When towing you have a higher load on the truck so you need good off idle boost otherwise you will heat soak the engine with high sustained EGT's.
If you tow alot the most you can get away with realistically and dependabley is a 62 or 64 compressor with a 71 turbine in a 12 or 13 exhaust housing. People tow with bigger turbos for sure but you trade away engine longevity (ala CQuestad - no offence). Towing twins follow the same concept.
The most you can tow at is usually around 500hp which you can do with a good 62 turbo. It is one thing to make a 500hp dyno run for 5 seconds or 14 second strip run or a 20 second pull.....It is a whole different thing to tow heavy for 5 hours straight at 24+psi. For towing the max EGT's should be 1250 degrees and generally less than 900 degrees. If you tow and go over 1250...the engine will be heat soaked and it will make everything run hot plus once it is heat soaked and you add even a little more fueling ....everything else has to absorb the heat....pistons, valve, rings, oil, and damage ulitmately results. Large trucks use big volume engines for a reason. The biggest make only 675hp... and 2250 torque. 900 degrees is a maximum average EGT for longevity. Kerry
When towing you have a higher load on the truck so you need good off idle boost otherwise you will heat soak the engine with high sustained EGT's.
If you tow alot the most you can get away with realistically and dependabley is a 62 or 64 compressor with a 71 turbine in a 12 or 13 exhaust housing. People tow with bigger turbos for sure but you trade away engine longevity (ala CQuestad - no offence). Towing twins follow the same concept.
The most you can tow at is usually around 500hp which you can do with a good 62 turbo. It is one thing to make a 500hp dyno run for 5 seconds or 14 second strip run or a 20 second pull.....It is a whole different thing to tow heavy for 5 hours straight at 24+psi. For towing the max EGT's should be 1250 degrees and generally less than 900 degrees. If you tow and go over 1250...the engine will be heat soaked and it will make everything run hot plus once it is heat soaked and you add even a little more fueling ....everything else has to absorb the heat....pistons, valve, rings, oil, and damage ulitmately results. Large trucks use big volume engines for a reason. The biggest make only 675hp... and 2250 torque. 900 degrees is a maximum average EGT for longevity. Kerry
Thread Starter
Muted one day, Banned the next....... Ah the life of a DTR 1%'er
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From: Ohio: Home of the disappointing sports teams
I hail to thee, oh diesel king
Thank you that answered my question and then some. I always wondered what egt's I should stay under for longevity. Awsome post
Thank you that answered my question and then some. I always wondered what egt's I should stay under for longevity. Awsome post
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From: Florida
A racing turbo will have a larger compressor(cold) and turbine(hot) side than a towing turbo. It will take longer to spool and will not get fully on its map till higher boost levels. At low boost levels and every spool up you will smoke alot. It will of course flow alot more air in and out at higher fueling levels and especially rpms. To daily drive a larger turbo you have to either keep the fueling higher or the rpms higher or both.
When towing you have a higher load on the truck so you need good off idle boost otherwise you will heat soak the engine with high sustained EGT's.
If you tow alot the most you can get away with realistically and dependabley is a 62 or 64 compressor with a 71 turbine in a 12 or 13 exhaust housing. People tow with bigger turbos for sure but you trade away engine longevity (ala CQuestad - no offence). Towing twins follow the same concept.
The most you can tow at is usually around 500hp which you can do with a good 62 turbo. It is one thing to make a 500hp dyno run for 5 seconds or 14 second strip run or a 20 second pull.....It is a whole different thing to tow heavy for 5 hours straight at 24+psi. For towing the max EGT's should be 1250 degrees and generally less than 900 degrees. If you tow and go over 1250...the engine will be heat soaked and it will make everything run hot plus once it is heat soaked and you add even a little more fueling ....everything else has to absorb the heat....pistons, valve, rings, oil, and damage ulitmately results. Large trucks use big volume engines for a reason. The biggest make only 675hp... and 2250 torque. 900 degrees is a maximum average EGT for longevity. Kerry
When towing you have a higher load on the truck so you need good off idle boost otherwise you will heat soak the engine with high sustained EGT's.
If you tow alot the most you can get away with realistically and dependabley is a 62 or 64 compressor with a 71 turbine in a 12 or 13 exhaust housing. People tow with bigger turbos for sure but you trade away engine longevity (ala CQuestad - no offence). Towing twins follow the same concept.
The most you can tow at is usually around 500hp which you can do with a good 62 turbo. It is one thing to make a 500hp dyno run for 5 seconds or 14 second strip run or a 20 second pull.....It is a whole different thing to tow heavy for 5 hours straight at 24+psi. For towing the max EGT's should be 1250 degrees and generally less than 900 degrees. If you tow and go over 1250...the engine will be heat soaked and it will make everything run hot plus once it is heat soaked and you add even a little more fueling ....everything else has to absorb the heat....pistons, valve, rings, oil, and damage ulitmately results. Large trucks use big volume engines for a reason. The biggest make only 675hp... and 2250 torque. 900 degrees is a maximum average EGT for longevity. Kerry
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Joined: Jan 2004
Posts: 2,696
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From: Maritimes, Canada
I Have my M.B.P.......Masters in Broken Parts....nothing like the school of hard knocks and visiting a lot of smart diesel techs and engine builders to get a little background. If your truck is a needed daily driver.....I wouldn't go over 45psi of boost. You can ARP it, Oring it, Firering it, super glue it....Anything over 45psi for extended cummulative periods of time will cause damage. The Pro Sled Pullers pull their engines apart every week. I started playing with my engine at about 100k...and it lasted for another 60K but heck it got to making big power....I wouldn't have done it at all if I didn't have a spare engine, a spare truck, no pressing need to have the diesel truck on the road.
My favorite turbo right now....based on materials, reputation, and company is the HTT, 62/71/13ss. On this page there is a guy that isn't pleased with it....so there you go. No turbo is perfect for everyone.
If I wasn't so busy with my real job, I'd work on getting the turbo we need perfected. When I was a student, My summer job was to tear apart a GE gas turbine with the British tech... I had to clean, polish, and inspect every part....and it was then that I fell in love with multistage compressors.....HMMMMMM. Kerry
My favorite turbo right now....based on materials, reputation, and company is the HTT, 62/71/13ss. On this page there is a guy that isn't pleased with it....so there you go. No turbo is perfect for everyone.
If I wasn't so busy with my real job, I'd work on getting the turbo we need perfected. When I was a student, My summer job was to tear apart a GE gas turbine with the British tech... I had to clean, polish, and inspect every part....and it was then that I fell in love with multistage compressors.....HMMMMMM. Kerry
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Joined: Sep 2004
Posts: 533
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From: big spring tx.
A racing turbo will have a larger compressor(cold) and turbine(hot) side than a towing turbo. It will take longer to spool and will not get fully on its map till higher boost levels. At low boost levels and every spool up you will smoke alot. It will of course flow alot more air in and out at higher fueling levels and especially rpms. To daily drive a larger turbo you have to either keep the fueling higher or the rpms higher or both.
When towing you have a higher load on the truck so you need good off idle boost otherwise you will heat soak the engine with high sustained EGT's.
If you tow alot the most you can get away with realistically and dependabley is a 62 or 64 compressor with a 71 turbine in a 12 or 13 exhaust housing. People tow with bigger turbos for sure but you trade away engine longevity (ala CQuestad - no offence). Towing twins follow the same concept.
The most you can tow at is usually around 500hp which you can do with a good 62 turbo. It is one thing to make a 500hp dyno run for 5 seconds or 14 second strip run or a 20 second pull.....It is a whole different thing to tow heavy for 5 hours straight at 24+psi. For towing the max EGT's should be 1250 degrees and generally less than 900 degrees. If you tow and go over 1250...the engine will be heat soaked and it will make everything run hot plus once it is heat soaked and you add even a little more fueling ....everything else has to absorb the heat....pistons, valve, rings, oil, and damage ulitmately results. Large trucks use big volume engines for a reason. The biggest make only 675hp... and 2250 torque. 900 degrees is a maximum average EGT for longevity. Kerry
When towing you have a higher load on the truck so you need good off idle boost otherwise you will heat soak the engine with high sustained EGT's.
If you tow alot the most you can get away with realistically and dependabley is a 62 or 64 compressor with a 71 turbine in a 12 or 13 exhaust housing. People tow with bigger turbos for sure but you trade away engine longevity (ala CQuestad - no offence). Towing twins follow the same concept.
The most you can tow at is usually around 500hp which you can do with a good 62 turbo. It is one thing to make a 500hp dyno run for 5 seconds or 14 second strip run or a 20 second pull.....It is a whole different thing to tow heavy for 5 hours straight at 24+psi. For towing the max EGT's should be 1250 degrees and generally less than 900 degrees. If you tow and go over 1250...the engine will be heat soaked and it will make everything run hot plus once it is heat soaked and you add even a little more fueling ....everything else has to absorb the heat....pistons, valve, rings, oil, and damage ulitmately results. Large trucks use big volume engines for a reason. The biggest make only 675hp... and 2250 torque. 900 degrees is a maximum average EGT for longevity. Kerry
I was going to say excellent post but everyone beat me to it
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Joined: Feb 2005
Posts: 1,714
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From: Pueblo West
My A2k is an awesome towing turbo and sacrifices nothing! In fact, it's much better for a driver than the stock 305 choker. It has a BIG turbine housing and keeps egt and drive pressure low. I compared it to a HX35/14 I had and it's night and day, bigger - I'd guess 16-18 sq. cm. I don't know how they get it to spool so fast, for such a big exh. side. I can only hit ~1225 egt with my Pred 100hp program. The down side is, it's only good for about 450hp but that's fine for me and the driveability is supurb. The A3k (~550hp) would be better for more hp and isn't much slower spooling, according to the ATS site. Craig
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