sean2k

hi all wots the diffence in the big and small turbo 4 escort cossies ie make and bhp cheers sean2k

georgie1

iTrader: (6)

hi m8 small turbo t25 big turbo is t3 i think they got the same power but small turbo has no lag where big turbo has lag but the big turbo can be more tune where small turbo need more money to get big power i have a small turbo

pa_sjo

The later Escort Cosworth is just a refined version of the earlier one.. different turbo/head/injectors/management/etc... Early cars had a hybrid T34 turbocharger, later ones had a hybrid T28.. both produce similar power in stock form.. as above, the later cars aren't as easy to extract power from - but anything is possible!

sean2k

wot do u class as early cars tho?

sean2k

also can sum 1 go though al the turbos 4 the ford ie t3 wot the hell does tyhat mean

pa_sjo

The early/late cars are completely different.. Changed in 1996 I believe.

rapidcossie

they didnt have "hybrid" turbos as standard.

georgie1

iTrader: (6)

it diffrent sizes t28,t3,t3.4,t4 then u got ur gt30 come on people help him out as i dont know to much

georgie1

iTrader: (6)

i thought mine was a t25 not t28 and i agree hybid is not standard wish it was lol

MarkN

They changed in 1994. J and K platers are large turbos, L is a crossover year but mostly large, then M, N and P are small, but some may have been converted to large.

pa_sjo

I think you'll find it is a hybrid. A hybrid developed by Garrett for Ford. All Ford RS turbochargers are 'hybrids'.

rapidcossie

suppsoe escorts came with t35s too

pa_sjo

No such thing as a T35.. Early Escort Cosworths came with the TBO34, or T34 as it's commonly referred to.. T3 turbine, T4 compressor.. Hybrid.

georgie1

iTrader: (6)

so what i got then m8 as it a small turbo on a n plate and i dont think it hybrid as that about 800 pound

pa_sjo

The later car comes with a T28 turbocharger.. again a hybrid unit made for Ford by Garrett.. T3 compressor wheel in a T25 housing..

georgie1

iTrader: (6)

how can i know for sure mine is a n plate and if it has yippee

pa_sjo

It should say on the label on the front of the turbo.. assuming it's still got the original turbo and ID plate on it.

georgie1

iTrader: (6)

i will have to have a look cant say i seen a label but my car only done 42000 miles

GUZZLER

iTrader: (3)

1994 was the change over year from big to small turbo, you see a good mix of small & big turbos on an M plate, early small turbos still had the big mirrors & early badging on the tailgate.
small turbo had a fuel flap instead of a visable cap, it also had a different engine, YBP with oil squirt jets as standard & the head was meant to flow better, different exhaust, inlet manifolds, managment & turbo but most of the running gear was the same.

cosworth3d

small turbo



Big turbo (only this is an T3 sierra turbo instead of een T35 but this is the difference in the underbonnet look)

adamski frst

the cross over from big turbo to small was about AUG 1995...

Rippers

There where loads of differences between the BigTurbo/Small Turbo change over was mid 1994

Full filler cap to flap as mentioned above
Wing mirrors flappy to tear drop
Extra wind proofing seals on the b-pillar and bottom door frame
Rear Badging positions and type
Certain colours phased out and added ie I've never seen a Pacifica or Polais Small turbo and I've never seen a auralias Big Turbo etc
I think all Small turbos where Lux spec as well ie all had sunroofs and electrics etc

Engine wise Big turbo had the larger T34 turbo and the classic blue cam cover.
Small turbo had a Smaller T25 turbo different Exhaust manifold, different inlet manifold, throttle body, ISCV, oil kidney/flame trap, different head, cam cover, different ignition leads and coil packs, different timing belt cover, oil spray jets under the pistons, different ECU which used different sensors (crank/phrase etc), MAF sensor on the different airbox lid, recirc valve came directly off the turbo, Fuel rails where painted black for some reason on the Small turbos aswell.

Rippers

Hate to say but that is a very poor example of a big turbo bay.
It has a Sierra Turbo and turbo heat shield, Sierra cam cover, Sierra cam pulley cover, Small turbo fuel rail and a sierra Alternator.. its got to be a build up doesn't even have the vins plates

This is what a Big Turbo bay looks like

sean2k

wots the diffence between t34 and t25? wot does all the letters and numbers mean? cheers sean2k

Rippers

Basically the T34 is a bigger laggier turbo which comes on boost later which is capable of being tuned upto 350 bhp
The T25 is a smaller less laggier turbo which comes on boost sooner but is only tunable upto about 280bhp

In standard/stage1 tuned state the T25 is better as the boost there earlier. the big turbo is better for more power thou

They are phyically different in size and the T25 has a triangular looking take off on the front housing for a recirc (no noise dumo valve)

cosworth3d

Your totally right i could not find the right picture so soon

sean2k

thanks lads 4 the info cheers sean2k

sean2k

is the escort cossie teh same 4 both 4x4 and 2wd ie engine and gearbox

ECOS95

The Escort only came as 4x4.

GUZZLER

iTrader: (3)

'94

sean2k

all escort cossies r 4x4 then?

S1rst

Yes there all 4x4 mate. I have a small turbo by the way and love it.

ECOS95

yep, the MK4 0r Mk5 RS2000 came as 2wd & 4wd. You could be getting confused with that. Some people do convert their Escort to 2wd also.

redrsmk5

yep correct mines one of the change over cars of which im reliably informed there were 27 of

S1rst

My mate had an M plate 94 small turbo with big turbo fuel cap, bt mirrors and bt badge layout.

sean2k

hi there can sum 1 send me sum pics of the big turbo and small turbo in the diffence ie bodywork i ant geting this at all