.48 to .63
11-01-2014, 10:35 AM
#1
Too many posts.. I need a life!!
Thread Starter
.48 to .63
hi all
just wondering if anyone happens to know,does the chip have to be altered on the msd chip(its the 380 siemens 55Ibs chip),if i change the exhaust housing from the .48 to .63.
Also would i gain anything in changing either cams from standard,at the mo the specs are
:-
7.5-1cr
55 siemens
standard 4x4 head
larger intercooler
pistons with valve cutouts
long studded
steel headgasket
cheers all
matt
just wondering if anyone happens to know,does the chip have to be altered on the msd chip(its the 380 siemens 55Ibs chip),if i change the exhaust housing from the .48 to .63.
Also would i gain anything in changing either cams from standard,at the mo the specs are
:-
7.5-1cr
55 siemens
standard 4x4 head
larger intercooler
pistons with valve cutouts
long studded
steel headgasket
cheers all
matt
12-01-2014, 11:31 AM
#7
Testing the future
i never understand why this question gets asked. surely with a bit of thought it's obvious? 
there must be a reason for wanting to change the exhaust housing. presumably the idea is that you want or expect more power.
if that is the case, where is that extra power going to come from? you would hope that you get more airflow through a bigger housing (for a given boost pressure) wouldn't you?
if that is the case, to have the correct air/fuel mixture, you need to have more fuel. where is that extra fuel going to come from?
the chip is written to give a certain amount of fuel for a certain engine speed and boost pressure (as well as temperature etc). it doesn't actually know what airflow there is, as there is no airflow meter with the weber management.
so of course you need a chip (containing correctly calibrated maps) for the spec of engine that it is running.
there must be a reason for wanting to change the exhaust housing. presumably the idea is that you want or expect more power.
if that is the case, where is that extra power going to come from? you would hope that you get more airflow through a bigger housing (for a given boost pressure) wouldn't you?
if that is the case, to have the correct air/fuel mixture, you need to have more fuel. where is that extra fuel going to come from?
the chip is written to give a certain amount of fuel for a certain engine speed and boost pressure (as well as temperature etc). it doesn't actually know what airflow there is, as there is no airflow meter with the weber management.
so of course you need a chip (containing correctly calibrated maps) for the spec of engine that it is running.
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12-01-2014, 11:36 AM
#8
i never understand why this question gets asked. surely with a bit of thought it's obvious?
there must be a reason for wanting to change the exhaust housing. presumably the idea is that you want or expect more power.
if that is the case, where is that extra power going to come from? you would hope that you get more airflow through a bigger housing (for a given boost pressure) wouldn't you?
if that is the case, to have the correct air/fuel mixture, you need to have more fuel. where is that extra fuel going to come from?
the chip is written to give a certain amount of fuel for a certain engine speed and boost pressure (as well as temperature etc). it doesn't actually know what airflow there is, as there is no airflow meter with the weber management.
so of course you need a chip (containing correctly calibrated maps) for the spec of engine that it is running.
there must be a reason for wanting to change the exhaust housing. presumably the idea is that you want or expect more power.
if that is the case, where is that extra power going to come from? you would hope that you get more airflow through a bigger housing (for a given boost pressure) wouldn't you?
if that is the case, to have the correct air/fuel mixture, you need to have more fuel. where is that extra fuel going to come from?
the chip is written to give a certain amount of fuel for a certain engine speed and boost pressure (as well as temperature etc). it doesn't actually know what airflow there is, as there is no airflow meter with the weber management.
so of course you need a chip (containing correctly calibrated maps) for the spec of engine that it is running.
Im changing your name to victor meldrew
12-01-2014, 12:45 PM
#9
Too many posts.. I need a life!!
Thread Starter
i never understand why this question gets asked. surely with a bit of thought it's obvious?
there must be a reason for wanting to change the exhaust housing. presumably the idea is that you want or expect more power.
if that is the case, where is that extra power going to come from? you would hope that you get more airflow through a bigger housing (for a given boost pressure) wouldn't you?
if that is the case, to have the correct air/fuel mixture, you need to have more fuel. where is that extra fuel going to come from?
the chip is written to give a certain amount of fuel for a certain engine speed and boost pressure (as well as temperature etc). it doesn't actually know what airflow there is, as there is no airflow meter with the weber management.
so of course you need a chip (containing correctly calibrated maps) for the spec of engine that it is running.
there must be a reason for wanting to change the exhaust housing. presumably the idea is that you want or expect more power.
if that is the case, where is that extra power going to come from? you would hope that you get more airflow through a bigger housing (for a given boost pressure) wouldn't you?
if that is the case, to have the correct air/fuel mixture, you need to have more fuel. where is that extra fuel going to come from?
the chip is written to give a certain amount of fuel for a certain engine speed and boost pressure (as well as temperature etc). it doesn't actually know what airflow there is, as there is no airflow meter with the weber management.
so of course you need a chip (containing correctly calibrated maps) for the spec of engine that it is running.
I meant the cam change,as for the chip,I was,nt sure if the tolerances of the chip would cover the .63,because when you read the info that comes with the msd chip,(the msd 380 chip),it states that these figures are possible with the bigger housing,implying that,,that figure won't be possible with the smaller housing.
13-01-2014, 10:45 AM
#11
I had all 3 variants of ex housing. .48 .55 .63
.63 was by far the best.
Inlet - change to BD14
Ex - leave as standard.
Ask Stu to amend chip to suit. You will sacrifice some low end power (below 3K) with the inlet change but in all honesty who cares about that. You will hold onto your power higher up the rev range with the .63 and the cam. Want low end power - go buy a common rail diesel.
.63 was by far the best.
Inlet - change to BD14
Ex - leave as standard.
Ask Stu to amend chip to suit. You will sacrifice some low end power (below 3K) with the inlet change but in all honesty who cares about that. You will hold onto your power higher up the rev range with the .63 and the cam. Want low end power - go buy a common rail diesel.
13-01-2014, 06:17 PM
#12
I meant the cam change,as for the chip,I was,nt sure if the tolerances of the chip would cover the .63,because when you read the info that comes with the msd chip,(the msd 380 chip),it states that these figures are possible with the bigger housing,implying that,,that figure won't be possible with the smaller housing.I like MSD's wording though lol.
Martin
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