2.5" hi flow exhaust and hi flow muffler on a turbo diesel will that drop the rpm that the engine comes on boost , improve power and economy. Is there any point ?
Thanks for any help
Stop bagging the MIGHTLY RD28T its not that bad compared to the 4.2.
I did the Simpson including Big Red just as well as my mates 4.2 turbo GU and with better fuel economy.
I bet a 4.2turbo is a real slug compared to a chevy 6.5 turbo. :lol:
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Hi flow exhaust for turbo diesel
i have a factory turbo 4.2 gu.
previous exhaust was stock system cut off just behind the cab....would go up the toowoomba range in 3rd at 400 revs at the top [did it just to see if it would make it in 3rd] but normally i would have to go back to 2nd as it would not hold third.
Beaudesert exhaust custom made me a 3"system [from back of turbo] that ended at the same spot.
neither exhaust had a muffler...nothing else has been done [fuel increase etc]
this time the truck held high revs in third and i could have gone fourth but it would not have held.
On another hill...
before: hit bottom at 100kmh and used 4th, went over the top at 90kmh.
after: hit bottom at 100kmh and used 5th, went over the top at 90 kmh.
so i guess you really could say the new exhaust made one gear difference.
i would expect similar improvement in your 2.8.
previous exhaust was stock system cut off just behind the cab....would go up the toowoomba range in 3rd at 400 revs at the top [did it just to see if it would make it in 3rd] but normally i would have to go back to 2nd as it would not hold third.
Beaudesert exhaust custom made me a 3"system [from back of turbo] that ended at the same spot.
neither exhaust had a muffler...nothing else has been done [fuel increase etc]
this time the truck held high revs in third and i could have gone fourth but it would not have held.
On another hill...
before: hit bottom at 100kmh and used 4th, went over the top at 90kmh.
after: hit bottom at 100kmh and used 5th, went over the top at 90 kmh.
so i guess you really could say the new exhaust made one gear difference.
i would expect similar improvement in your 2.8.
[url=http://bigred.redbubble.com/][color=red][b]You can follow me but its gunna hurt ![/b][/color][/url]
event pics http://bigred.redbubble.com/
event pics http://bigred.redbubble.com/
i have a factory turbo 4.2 gu.
previous exhaust was stock system cut off just behind the cab....would go up the toowoomba range in 3rd at 400 revs at the top [did it just to see if it would make it in 3rd] but normally i would have to go back to 2nd as it would not hold third.
Beaudesert exhaust custom made me a 3"system [from back of turbo] that ended at the same spot.
neither exhaust had a muffler...nothing else has been done [fuel increase etc]
this time the truck held high revs in third and i could have gone fourth but it would not have held.
On another hill...
before: hit bottom at 100kmh and used 4th, went over the top at 90kmh.
after: hit bottom at 100kmh and used 5th, went over the top at 90 kmh.
so i guess you really could say the new exhaust made one gear difference.
i would expect similar improvement in your 2.8.
previous exhaust was stock system cut off just behind the cab....would go up the toowoomba range in 3rd at 400 revs at the top [did it just to see if it would make it in 3rd] but normally i would have to go back to 2nd as it would not hold third.
Beaudesert exhaust custom made me a 3"system [from back of turbo] that ended at the same spot.
neither exhaust had a muffler...nothing else has been done [fuel increase etc]
this time the truck held high revs in third and i could have gone fourth but it would not have held.
On another hill...
before: hit bottom at 100kmh and used 4th, went over the top at 90kmh.
after: hit bottom at 100kmh and used 5th, went over the top at 90 kmh.
so i guess you really could say the new exhaust made one gear difference.
i would expect similar improvement in your 2.8.
[url=http://bigred.redbubble.com/][color=red][b]You can follow me but its gunna hurt ![/b][/color][/url]
event pics http://bigred.redbubble.com/
event pics http://bigred.redbubble.com/
I run a similar setup under my 260 (MQ) LWB with the RD28T and the turbo kicks in about 3-4 RPM earlier than before. Definitly worth it ! The sound is much deeper and throatier but not too loud.
BTW, the RD28T is not that bad. Mine is at 265k KM's and only needed a new cyl.head @ 260k because of excessive high-speed abuse here in Germany.
BTW, the RD28T is not that bad. Mine is at 265k KM's and only needed a new cyl.head @ 260k because of excessive high-speed abuse here in Germany.
'04 Nissan Terrano 3.0Di ZD30 *pimped*, some Zooks & '87 GQ
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