abdr500

iTrader: (1)

were could i by a spacer thing that fits in betwen the inlet manfold on a cossy

Anonymous

Is that a good idea on a standard inlet ?

As your increasing the plenum volume yet not reducing the restriction of the crap design of the plenum elbow.

Ginge !

wouldnt ya ned a remap though if ya done it ???

abdr500

iTrader: (1)

seen it loads of time and have heard good things about them its not form me as i have a 500 plenuim but alot of m8s ask me so would just like to were i can by them from cheers

abdr500

iTrader: (1)

i dont think your gona need a re map

Ginge !

well the inlet manifold volume has gone UP but the presure whould be different im sure

anyone care to confirm or deny

abdr500

iTrader: (1)

ok lets see

Anonymous

No remap yet your changin the air taken into the engine....

mmmm

sounds like a load of old shite to me

Stu @ M Developments

iTrader: (12)

Anything whatsoever that affects airflow in a positive or negative way will be totally invisible to an antique speed density ECU.

Ginge !

ok now im confused as im thinking theres more air volume in the inlet ???

or if not the map sensor will read lower ???


im not too sure but just my way of thinking

RichardPON

Ginge,

The pressure inside the balloon is the same, no matter what size the balloon is.....

Anonymous

BUT it takes longer for the air to travel from the butterfly to the inlets.....

THEREFORE it aint the same

(pressure is tho, as pressure is pressure, as in it measures the pressure so thats the reading)

Ginge !

yeah stu that helps , try in english , im not a scientist

Ginge !

thats the best explanation to use, pon you should be a teacher !!!!


thats a explanation for dummys and one that i understand too

Matt

the time taken to fill the baloon takes longer if its bigger though

id "guess" increasing the plenum chamber volume will effect throttle response

thoughts?

Ginge !

now where getting techy again


pon help me out

RichardPON

Who was talking about time?

You might be right, but I really can't see it making THAT much difference............. hence it seems a little pointless unless you sort the elbow like Dingle said.....

Ginge !

if ya sort the elbow the what happens

RichardPON

I think it's supposed to be a restriction, but I've never tested it myself so I couldn't be certain.

N.B. If above statement is too honest for PassionFord, it can be withdrawn at anytime

Matt

mapping has quite a lot to do with time id say rich

RANJ

rods spacer/mods worked well

Ginge !

SO WOULD THE CAR NEED A REMAP OR NOT !!!!!

with or without the elbow changing !!!!!




i was learning now im well confused

RichardPON

But he's also sorted all the other restrictions too though?

RANJ

yes rich

alot of works gone into that inlet

GARETH T

i think any gain,, is a gain,, no matter is there is more pressing matters somewhere else

Karl

As Stu has commented, any speed density ecu cannot correct for a change in air flow for a given air pressure. This means that if you change your plenum on a cossie engine you WILL need a remap.

In laymans terms this is because the speed density system uses estimated air flow (Or V.E. to be precise) based on rpm and air density. If you increase the engine air flow (i.e. +% on V.E) for the same plenum pressure (e.g. by spacing the plenum away from the trumpets) then the engine will run leaner and hence need remapping.

In addition increasing plenum volume has a dramatic effect on transient fueling as the volume of air between the cylinder and throttle body has increased. On L1/6 this can be difficult to do anything about and can result in slight hesitation between gear changes, but L8/P8 and better can all be remapped to cope perfectly with increased plenum volumes.

Ginge !

cheers karl


verdict is I WAS RIGHT !!!!!!

Matt

no the verdict is...... you asked "wouldnt ya ned a remap though if ya done it ???" and now you know why

SPADGE

To answer the original question - I have one 50 quid delivered

abdr500

iTrader: (1)

SPADGE, ok have you still got the spacer then and do you know were to by them from as i get asked so much for them and if i turn up with 1 then thers gona be a few others thant whant them 2

CosRush

I have a mate who is running one, but its a Phenolic one...

This does a excellent job of insulating the head temp from the inlet, and he has a temp graph to prove it, before and after fitment.

Means after boost the heatsoak to the plenum from the head is massively reduced therefore the Act sensor stays almost normal instead of shooting up...

Got some pix if anyones interested.