RS air flow meters?

[rizla]

whats the difference between a normal vr4 (j-spec) and a vr4 rs/evo 0 air flow meter/MAF??

and how can you tell which is which??

Reason im asking is that ive just scored a '91 vr4 rs evo 0. (E38a- 0002XXX, l.s.d, short ratio gearbox, big 16g turbo, wind up windows, MD165808 E.C.U ,blah blah...)

BUT it has 3 blue top injectors an 1 yellow top injector, yellow top on #1 piston.

did some of the RS vr's only come with the blue tops?

and would the air flow meter have to been changed to run the smaller injectors??

sory bout all the Qs.

any help wud be gud..

cheers.

 

[rob323]

whats the difference between a normal vr4 (j-spec) and a vr4 rs/evo 0 air flow meter/MAF??

Nothing, they are the same.

Reason im asking is that ive just scored a '91 vr4 rs evo 0. (E38a- 0002XXX, l.s.d, short ratio gearbox, big 16g turbo, wind up windows, MD165808 E.C.U ,blah blah...)

BUT it has 3 blue top injectors an 1 yellow top injector, yellow top on #1 piston.

did some of the RS vr's only come with the blue tops?

Only prefacelift RS's (88 and 89 models) came with blue (450cc) injectors.
Facelift (90-) should have ALL yellow injectors.
Your ecu will be causing the car to run LEAN. DO NOT BOOST IT.
And pay a visit to whoever you bought it from. It's not Mal's one is it?

and would the air flow meter have to been changed to run the smaller injectors??

irrelevant but no.

Rob.

 

[murray]

mine is a 1990 facelift rs and it had blue top injectors and small turbo, go figger,

 

[rob323]

Woops, yes, there do seem to be a few odd balls in that change over period, there is one here in Brissy as well that is a "bitsa".

 

[VR-4Squid]

not a bitsa at all.

pre 89.10 vr4 rs's had 450's, 14b's and 3 bolt plate lsd and 205ps (pre facelift)

89.10 to 90.10 vr4 rs's had 450's, 14b's, 3 bolt plate lsd and 220ps (facelift)

after 90.10 they were all "evo 0" spec, 510's, 16G, 4 bolt plate lsd and 240ps

of course any car could've been modified by a previous owner, but that is how they would've left the factory.

 

[brettu26]

I understood the AFM was different to match the 510's and 16G?

i have a spare one sitting at home, will check it for numbers etc tonight

 

[GVR40]

the AFM is the same on all vr4's

 

[rizla]

I understood the AFM was different to match the 510's and 16G?

i have a spare one sitting at home, will check it for numbers etc tonight

Thats what i thought ?
Thanks. Sum numbers would help out.

 

[rizla]

Only prefacelift RS's (88 and 89 models) came with blue (450cc) injectors.
Facelift (90-) should have ALL yellow injectors.
Your ecu will be causing the car to run LEAN. DO NOT BOOST IT.
And pay a visit to whoever you bought it from. It's not Mal's one is it?

If thats malcom crokenberg (spelling), yea its his old 1.

 

[GVR40]

The difference is not in the afm it is in the ecu, there is different coding on the ecu that handles the corrections for the bigger injectors and turbo

 

[GSR]

definitely different afm, flows about 25% more at the same frequency output.

 

[rob323]

I'd take it back to Mal and ask him why there are different injectors in it. He knows as much about these cars as anyone.

 

[brettu26]

top stuff thanks GSR

 

[VR-4Squid]

to lessen confusion, stop thinking of the RS as being the 'special' vr4.

there are 3 different specs of RS, depending when they were built (aside from the type of rear lsd the mechanical specs are the same as those years 'non RS' vr4's.
pre 89.10 - 205hp, 450's, 14b, 3 bolt mech lsd
pre 90.10 - 220hp, 450's, 14b, 3 bolt mech lsd
post 90.10 - 240hp, 510's, 16g, 4 bolt mech lsd (commonly referred to as Evolution, Evo 0 or RS-E).

the 240hp vr4's have afm part no: MD171249

the 220hp vr4's have afm part no: MD140241

 

[brettu26]

late update, but the part no. on my evo 0 AFM is E5T02671

 

[rizla]

late update, but the part no. on my evo 0 AFM is E5T02671

thats the number on top of my AFM too.

thanks 4 that.

removed all sparkplugs an found the ones fed from the lil blue 1s where white and the plug fed from the 510 was light brown.

have since ditched the miss matched injectors and replaced with 550s. runs alot better now.

 

[brettu26]

beauty! good work
miss-matched injectors must've been horrible!