EGT and hill
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From: Quesnel B.C
EGT and hill
well first day taking my truck out of town and it really goes good on the flats and drives excellent, little rough but what can ya expect from these trucks, anyway i was climing a hill but the temp got up to 9 and losses speed from 120 kmh to 100 or lower at the top and a long grade, i climbed it in over drive because when i dropped it into normal drive it seemed to rev high, is this normal for these trucks? especially the exhaust temp seemed high, but it was floored to keep up to speed, if i do some more grinding on the fuel pin and turn the fuel screw up some more along with governor spring will this help it keep it's speed up with out having to have the throttle so far in it, also does the 3200 gov spring help through all ranges of driving? as to how it pulls? or do i need a 16 cm housing to help a bit. and i know turning up the fuel does not help the temp but do you have any suggestions to keep it down?
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From: Pen Argyl Pennsylvania
If you have your piro in the manifold and are reading 900 on a hill pullin hard your in good shape. If you decide to grind your pin more and do more pump tweaking you temps will be a bit higher, but the lower the better. If your happy with the way it performs on the flats and aren't looking to race on a up hill I would say leave it alone BUT get the 3200 spring in there. The spring will make it easier to drive and give you more of a RPM range before it looses power, I am glad that that was the first thing I did. I really noticed a drivability difference in that it felt allot peppier and more fun. Do the spring before any other mods you will be happy.
Ryan
Ryan
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From: port crane, NY
well first day taking my truck out of town and it really goes good on the flats and drives excellent, little rough but what can ya expect from these trucks, anyway i was climing a hill but the temp got up to 9 and losses speed from 120 kmh to 100 or lower at the top and a long grade,
i climbed it in over drive because when i dropped it into normal drive it seemed to rev high, is this normal for these trucks?
It's a governed engine so you can't really over-rev it without a trailer pushing you downhill. I'm not sure if the a518 will allow a downshift that would put the engine into catastrophic RPM range. With the stock governor spring, you might have hit 3000 for a few seconds before fueling came back in at a lower road/engine speed.
especially the exhaust temp seemed high, but it was floored to keep up to speed, if i do some more grinding on the fuel pin and turn the fuel screw up some more along with governor spring will this help it keep it's speed up with out having to have the throttle so far in it, also does the 3200 gov spring help through all ranges of driving?
If you're talking pre-turbo, your EGT's are very reasonable. You will need more fuel to keep up on the hills--the governor spring will allow the pump to fuel to higher RPM's, but if it (the pump) is not set to deliver more fuel, you won't have any more power. Still, the 3200 spring is the cat's meow throughout the entire driving range
as to how it pulls? or do i need a 16 cm housing to help a bit. and i know turning up the fuel does not help the temp but do you have any suggestions to keep it down?
i climbed it in over drive because when i dropped it into normal drive it seemed to rev high, is this normal for these trucks?
It's a governed engine so you can't really over-rev it without a trailer pushing you downhill. I'm not sure if the a518 will allow a downshift that would put the engine into catastrophic RPM range. With the stock governor spring, you might have hit 3000 for a few seconds before fueling came back in at a lower road/engine speed.
especially the exhaust temp seemed high, but it was floored to keep up to speed, if i do some more grinding on the fuel pin and turn the fuel screw up some more along with governor spring will this help it keep it's speed up with out having to have the throttle so far in it, also does the 3200 gov spring help through all ranges of driving?
If you're talking pre-turbo, your EGT's are very reasonable. You will need more fuel to keep up on the hills--the governor spring will allow the pump to fuel to higher RPM's, but if it (the pump) is not set to deliver more fuel, you won't have any more power. Still, the 3200 spring is the cat's meow throughout the entire driving range
as to how it pulls? or do i need a 16 cm housing to help a bit. and i know turning up the fuel does not help the temp but do you have any suggestions to keep it down?
Cummins says 1250 pre-turbo all day long. If you're only hitting 900 on a long pull, you've got room for more fuel. As for keeping temps down, well, welcome to the club
The 12V head does not breathe very well and we are forever chasing the ultimate compromise of power and non-melted pistons
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