New mid pipe = power - Page 2

RAZ8550TDI · #11 26th-August-2008, 11:38

Quote:

Originally Posted by 90boy

Just fitted my new mid section on my 90 took it for a drive sounds better and gives me loads more power

am with you on that one 90 boy, revs much more freely, you can vary your back box to adjust and get rid of the tractor sound.

try this WELCOME!

nobber · #12 26th-August-2008, 12:04

with less back pressure in an exhaust system you tend to lose low end torque , another thing you have to worry about is the velosity at which the gas exits , bigger pipe bore = less back pressure = less velocity at which the gas exits the exhaust.

idealy you want the greatest amount of velocity with the least amount of back pressure , to get velocity the engine has to run at higher revs (this is why your engine is reving more easily) , to lose back pressure you have to remove exhaust restrictions.

so , basically what you are achieving is taking all the low end torque and putting it further up the rev band.

probably a good thing on a high performance car used to being driven in the higher rev bands , not so good on a land rover designed to rely on its low end torque.

DTZ · #13 26th-August-2008, 14:34

200 stock was 0.75-0.85 bar
300 stock was 1 bar

nobber · #14 26th-August-2008, 15:01

where did i get 1.2 from?
best go and turn my boost down a bit them.

DTZ · #15 26th-August-2008, 15:29

1.2 won't hurt a Tdi mate... not unless you've wound the fueling right up and drive it hard up very long steep hills repeatedly

nobber · #16 26th-August-2008, 15:59

Quote:

Originally Posted by DTZ

1.2 won't hurt a Tdi mate... not unless you've wound the fueling right up and drive it hard up very long steep hills repeatedly

its a td 19j ive got fella , 1.2 will blow it clean outta the water.
ma bonnet will be glowing red.
still , the joys of bein able to do 70 mph.....

90boy · #17 26th-August-2008, 19:26

well then why is my turbo kicking in about 500rpm sooner than before ???

RAZ8550TDI · #18 26th-August-2008, 20:10

Quote:

Originally Posted by nobber

with less back pressure in an exhaust system you tend to lose low end torque , another thing you have to worry about is the velosity at which the gas exits , bigger pipe bore = less back pressure = less velocity at which the gas exits the exhaust.

idealy you want the greatest amount of velocity with the least amount of back pressure , to get velocity the engine has to run at higher revs (this is why your engine is reving more easily) , to lose back pressure you have to remove exhaust restrictions.

so , basically what you are achieving is taking all the low end torque and putting it further up the rev band.

probably a good thing on a high performance car used to being driven in the higher rev bands , not so good on a land rover designed to rely on its low end torque.

if yer talking about naturally aspirated then yer but when it comes to turbos then you wanna free it up as much as poss.

RAZ8550TDI · #19 26th-August-2008, 20:12

Quote:

Originally Posted by 90boy

well then why is my turbo kicking in about 500rpm sooner than before ???

what that might be is you can can hear the turbo through the exhaust now, especially on the over run at low revs.

landowner · #20 27th-August-2008, 17:06

Diesels like cold air and plenty of it, I fitted my 2.8TD with an exhaust pipe from the turbo with an 18" cherry bomb about a foot from the end. It's about 10 feet overall and quiet.
The air filter has been opened up so it has a bigger inlet to suck on and it goes better and is more economical.
You can hear the air rushing out of the pipe at high revs though ..