E30 Zone

Does anyone know what extra bhp difference there is in an early pre face lift 325 over the later 325 engine.

Pretty certain the answer is nothing!

Some car spares websites distinguish the different motors by their power outputs, especially in Europe where the bhp figure is on the vehicle documents, but the difference is 1 bhp ! (171/170)

Ooooh, poweerrrrrr

big difference in they way they drive though certainly a big diff between my previous high comp and my current lower one.

kevo wrote:big difference in they way they drive though certainly a big diff between my previous high comp and my current lower one.

Someone else made a similar comment on here a while back and the forum regulars assured that the difference has much more to do with the difference between the Motronic versions than the compression.

May also be to do with the fact that most high comp engines are in prefacelift cars which i've seen mentioned tend to be lighter than the facelift E30s.

My old bronzit was E reg 1988 early face lift and hc engine. Drove differently to the one I have now.

clipper wrote:

kevo wrote:big difference in they way they drive though certainly a big diff between my previous high comp and my current lower one.

Someone else made a similar comment on here a while back and the forum regulars assured that the difference has much more to do with the difference between the Motronic versions than the compression.

How's that work, thought the change from 1.1 to 1.3 was
supposed to be a step forward, on a pre facelift engine.

gooner1 wrote:

clipper wrote:

kevo wrote:big difference in they way they drive though certainly a big diff between my previous high comp and my current lower one.

Someone else made a similar comment on here a while back and the forum regulars assured that the difference has much more to do with the difference between the Motronic versions than the compression.

How's that work, thought the change from 1.1 to 1.3 was
supposed to be a step forward, on a pre facelift engine.

I dunno, I was just repeating what someone else said in a previous discussion about the difference between high / not so high comp motors. I think it was due to the more progressive and user freindly mapping of 1.3 Motronics which give the impression of a softer power delivery.

I've only ever had a chromie with high comp and early Motronic so I can't even give an opinion on the difference, percieved or real.

gooner1 wrote:

clipper wrote:

kevo wrote:big difference in they way they drive though certainly a big diff between my previous high comp and my current lower one.

Someone else made a similar comment on here a while back and the forum regulars assured that the difference has much more to do with the difference between the Motronic versions than the compression.

How's that work, thought the change from 1.1 to 1.3 was
supposed to be a step forward, on a pre facelift engine.

It's a big step forward, best thing you can do to a high comp is fit 1.3. It's like chipping it and then having room to map it again.

clipper wrote:
I've only ever had a chromie with high comp and early Motronic so I can't even give an opinion on the difference, percieved or real.

The same situation for me, Clip.
Will be able to comment on the Motronic change soonish though, hopefully.

I am thinking about going down this route on my tech 2

High comp on a 1.3.

Is there are any zoners who have done this and felt more performance, responsive

When was the change from high to low comp?

George wrote:When was the change from high to low comp?

bss325i wrote:Right, it transpires that,

256E1 compression ratio of 9.7:1 (early motronic)

256E2 Compression ratio of 9.4:1 (late motronic)

256K1 Compression ratio of 8.8:1 (late motronic, cat prepped or with a cat)

For UK cars,

256E1 sept '85 to sept '87

256E2 sept '87 to june '88

256K1 june '88 to end of production.

Thanks for the info bss325i, that would make my 1986 a high comp, early motronic.

mine is high comp not sure what diffrence it makes lol

djsimmy wrote:mine is high comp not sure what diffrence it makes lol

apparantly it only makes a differance if you switch from 1.1 to 1.3 motronic and also high comps are more tuneable.

there must some one here that can confirm this

what is motronic? ecu?

don't you have to change something on the fly wheel and have a lambda sensor added to the exhaust for the 1.3 upgrade?

gooner1 wrote:

clipper wrote:
I've only ever had a chromie with high comp and early Motronic so I can't even give an opinion on the difference, percieved or real.

The same situation for me, Clip.
Will be able to comment on the Motronic change soonish though, hopefully.

let us know when you do, nice one

ETERNITY wrote:

gooner1 wrote:

clipper wrote:
I've only ever had a chromie with high comp and early Motronic so I can't even give an opinion on the difference, percieved or real.

The same situation for me, Clip.
Will be able to comment on the Motronic change soonish though, hopefully.

let us know when you do, nice one

Will do but as i'm currently rebuilding mine into a 2.8, you would be probably be better doing a search on conversions
already carried out. Lot of conflicting advice as to which parts are needed though.