New mid pipe = power

90boy · #1 25th-August-2008, 12:49

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

pos · #2 25th-August-2008, 14:58

When you say that it sounds better does it sound more like a tractor pipe or more beefy?

90boy · #3 25th-August-2008, 16:02

more like a tractor now

nobber · #4 25th-August-2008, 17:48

when you say loads more power , does the term 'placebo' jump to mind?

90boy · #5 25th-August-2008, 17:58

placebo ??

Griffdowg · #6 25th-August-2008, 20:34

nice one nobber. thinking the same think. cant say i noticed much difference in mine after removing both boxes and shortening the overall length considerably... does sound better though

G

nobber · #7 25th-August-2008, 21:19

Quote:

Originally Posted by Griffdowg

nice one nobber. thinking the same think. cant say i noticed much difference in mine after removing both boxes and shortening the overall length considerably... does sound better though

G

yeah , you probably wont ,im no eggspert but the general science is , if it can get out easier its only being throttled on the other side.
you need to sort the induction system out , then the fueling to stop it from running too lean.
then you up the turbo boost if yer brave and depending on how much power your after you might want to put some better pistons in there before you melt them , then you have the valves to worry about , easy on a ohc engine blah blah , i think you get my drift?

straight through exhausts are a step up from go faster stripes though.

Patman1200 · #8 26th-August-2008, 10:22

Except on an old Suzuki Bandit 1200 where I gained an extra 20bhp taking it to 113bhp at the rear wheel and melted my neighbours ear'oles..

DTZ · #9 26th-August-2008, 11:11

Quote:

Originally Posted by nobber

yeah , you probably wont ,im no eggspert but the general science is , if it can get out easier its only being throttled on the other side.
you need to sort the induction system out , then the fueling to stop it from running too lean.
then you up the turbo boost if yer brave and depending on how much power your after you might want to put some better pistons in there before you melt them , then you have the valves to worry about , easy on a ohc engine blah blah , i think you get my drift?

straight through exhausts are a step up from go faster stripes though.

On a petrol engine maybe... but you can't run a Tdi diesel lean... it just doesn't happen. 'Lean' burning in a petrol means knock, detonation or pre-ignition. Diesel engines run on the knock principle anyway - i.e. compression ignition of fuel which is injected at the right point in the combustion cycle - ergo, no running lean and no melted pistons.

In fact... a mate of mine ran his standard 300 Tdi engine with a modified intake and aftermarket intercooler at 3 bar for a while and reported no problems, despite not changing the fueling. Personally I wouldn't go that high but 1.25 to 1.5 bar is distinctly 'do-able' with stock engine internals with no ill-effects. NOTE - with a standard intake and IC there's no point in going above 1 bar as to make more boost the added heat in the intake charge means that while the pressure is higher the overall quantity of oxygen will be much the same.

nobber · #10 26th-August-2008, 11:19

Quote:

Originally Posted by DTZ

On a petrol engine maybe... but you can't run a Tdi diesel lean... it just doesn't happen. 'Lean' burning in a petrol means knock, detonation or pre-ignition. Diesel engines run on the knock principle anyway - i.e. compression ignition of fuel which is injected at the right point in the combustion cycle - ergo, no running lean and no melted pistons.

In fact... a mate of mine ran his standard 300 Tdi engine with a modified intake and aftermarket intercooler at 3 bar for a while and reported no problems, despite not changing the fueling. Personally I wouldn't go that high but 1.25 to 1.5 bar is distinctly 'do-able' with stock engine internals with no ill-effects. NOTE - with a standard intake and IC there's no point in going above 1 bar as to make more boost the added heat in the intake charge means that while the pressure is higher the overall quantity of oxygen will be much the same.

arnt tdi's sposed to run at 1.2 anyways? i know td's run at o.8.