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Forum LockedE30 318iS Tuning(need 180bhp)

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Matt318is View Drop Down
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Direct Link To This Post Posted: 06-November-2003 at 20:40

I have currently got the 15" BBS X-spoke on my e30 but was wondering if i can get a wider wheel on the back.  I currently find when i really push the car through 1 - 2 as 2nd ingages i loose an incredable amount of traction through the rear.  My tyres are new and dampers are good.

Maybee uprate the rear dampers for a stiffer pair?

On the note of tuning i am aiming to reach about 170 on my 1.8is without extensive work. I met i guy at santa pod who was running a E30 318is Turbo and was hitting 290 Bhp!! This thing was fast and the work done was not stupidly out of reach, just time consuming.

There are a few American companies that make tuning parts for this engine and boast the ability to get a road running 1.8 is hitting 200bhp.

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Direct Link To This Post Posted: 06-November-2003 at 20:42




Edited by alanw15
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Direct Link To This Post Posted: 06-November-2003 at 22:31

Originally posted by beema318is beema318is wrote:

you joker... BOB... making yourself feel better...haha.. so u also have the 14 i assume? ill be looking for for good qulity alpinas maybe... but now it may just be 15" bbs cross spokes.. they keep the car looking more original and they seem to fit the arches well aswell..

If you want to get a 5 stud conversion I have a set of good M3 E30 alloys going spare and may let them go for a reasonible figure

Chris

As for the car I was having a look in Practical Classics and there is a garage in there that specialises in 320is. If you dont know its the Italian version of the M3 sort of and they start at 4k but Id just go out and get an M3 rather than spending ,000 on modding your car.

It all makes sense in the end cos youll end up getting one some day honest

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Direct Link To This Post Posted: 07-November-2003 at 07:35

E30 320is ?? I didn't even know this car existed...

Damn.. im always travelling to europe, should have picked one up from there... Have you guys seen the specs for that motor... its 191bhp!!! 0-60 in 7.1s.... (quicker than a 325i??) .. check these specs... don't know how accurate.. but they seem from a german website...

http://www.bmw-power.de/Service/BMW_Datenblaetter/BMW_E30_320is_Datenblatt.htm

DAmn...damn... That was the car i wanted...

 

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Direct Link To This Post Posted: 07-November-2003 at 09:24

Best bit with the 320iS is the fact you can get them in all the body styles from 4 door 316i Sleeper to the full on M-TechII kitted 325i Sport style.

Can beat the Q Car style.  

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Direct Link To This Post Posted: 07-November-2003 at 09:39
what do you mean by q style car? and is the 320is still available.. never seen or heard of it until today...
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Direct Link To This Post Posted: 07-November-2003 at 09:56

Q car style is when the car is really rather fast but looks very understated i.e 200bhp in what looks like a 316 body. Perfect example of this here (http://www.bmwe21.net/320is/)

THe 320iS was only produced for the Italian and Portuguese markets because of their stringent tax laws on engines over 2000cc. I think it was produced between about 1988 & 1990. It's basically the S14 M3 engine of reduced capacity (~1990cc) coded S14 B20 but externally looks very similar to the S14 B23.

Quite a few have found their way to the UK and there is a company down south who specialise in importing them or you could go to Italy and do it yourself. Have seen a couple advertised in the backs of Total BMW & BMW Car magazines.

 

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Direct Link To This Post Posted: 07-November-2003 at 11:17
"I have currently got the 15" BBS X-spoke on my e30 but was wondering if i can get a wider wheel on the back. I currently find when i really push the car through 1 - 2 as 2nd ingages i loose an incredable amount of traction through the rear. My tyres are new and dampers are good."

You need an LSD for traction. If you get bigger rear wheels/tyres you will increase understeer.

"Maybee uprate the rear dampers for a stiffer pair?"

You want a softer suspension for better traction to allow weight transfer. You could also try dropping the rear tyre pressures (causes more oversteer) - or disconnecting the rear anti-roll bar (causes more understeer).

I strongly suggest a LSD.
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Direct Link To This Post Posted: 08-November-2003 at 02:42

I tried the test to see if i have an LSD and as far as i can tell i do.

When i spin the wheels in 1st there are two even in lengh lines of rubber laid on the road.

Is there a way of finding out for sure if i have an Lsd?

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Direct Link To This Post Posted: 08-November-2003 at 08:05
Originally posted by Matt318is Matt318is wrote:

I tried the test to see if i have an LSD and as far as i can tell i do.


When i spin the wheels in 1st there are two even in lengh lines of rubber laid on the road.


Is there a way of finding out for sure if i have an Lsd?



Three ways i can think of,

1. Look at the metal tab on the back of the diff, if you can read the number on it, and it starts with L or is it S? It is a LSD, damn I can't remember now

2. Jack up one rear wheel, make sure the car is not in gear and the hand brake is off... try to rotate the wheel, if you feel no resistance then it isn't a LSD, not a guaranteed way of telling as if the brakes are binding etc it will feel stiff and you and up thinking you got a LSD.

3. Guaranteed way of telling, jack both rear wheels off the ground, hand brake off, out of gear. Rotate one rear wheel, if the other turns in the same direction it's LSD, if it turns the opposite way then it's a normal open diff.

Always ensure you jack the car on level ground etc, and chock with front wheels etc
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Direct Link To This Post Posted: 08-November-2003 at 09:07
Or you could take the diff off... - If it has a white S painted on the top then it's an LSD.

Edited by Omi318is
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Direct Link To This Post Posted: 10-November-2003 at 17:01
Guys.. if the engine is running, and you open the oil cap, should the engine run like normal... or stutter away like its about to die?
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Direct Link To This Post Posted: 10-November-2003 at 17:07
There will be a drop in oil pressure but it should still run. Not sure what this has to do with your required 180 bhp unless youve lost it all from the oil cap. Happen to me all the time
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Direct Link To This Post Posted: 10-November-2003 at 18:21
The 320is has 192-5BHP and has the M3 engine and gearbox although with a smaller capacity. So a dog leg first gear. Externally it is the same spec as a 325isport with full mtec bodykit LSD and recaro interior. An M3 head will bolt on and will raise the horsepower to about 205bhp. It is running at a slightly higher compression than a stock m3. It does not have the m3 steering rack so you have the slow 325 rack and i believe it runs on 4 stud rather than 5 stud wheels. Prices seem to range from 3-5k and most of them come with aircon. Insurance is less than a M3 or 325 i sport and you would be better of buying one of these then spending 1000's on a 318is. They are however LHD only 
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Direct Link To This Post Posted: 11-November-2003 at 12:04

3201s. Mmmmmmmmmmm. Sounds nice.

How come it is only .2 of a litre bigger that the 318 is but gets over 40BHP more?

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Direct Link To This Post Posted: 11-November-2003 at 12:18
The engines are very different. The 320is engine is the same engine as an e30 M3 just with a smaller capacity. This engine was taken from the M1 engine and two cylinders were lopped off making a very high compression 4 rather than a high compression 6 so that weight savings could be made for racing. The 318is engine is a good 16 valve unit, but is basically a very different design and runs on a lower compression. Basically the 320is/M3  is a race engine and the 318is is a road car engine in a nutshell.
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Direct Link To This Post Posted: 11-November-2003 at 12:20

Cause the 320iS is a cut down version of the E30 2.4  M3 engine.  M3 engines always produce around 100 bhp per litre.. from the E30 to the latest range... so the original 2.4 was a around 240bhp... they just cut it down to 2 litre... not take a standard 1.8 and increase it capacity....

But it is a very nice car though... i must say...

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Direct Link To This Post Posted: 11-November-2003 at 12:24

 I have a 318is with low mileage and it would be stupid to mess about it.... Are there any reports of people dropping the 320is engine into a stock E30 successfully to make a track day car?

 

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Direct Link To This Post Posted: 11-November-2003 at 12:45

It's not worth the hassle of transplanting the S14 B20 into another regular E30 shell. This is what the 320iS is and for the price of them you may as well buy genuine.

The 318iS ran at 10.0:1 compression while the 320iS was running 10.8:1. The main reason for the 40bhp increase is the use of individual throttle bodies on the S14 compared to the single set up of the M42. Plus really the S14 whether in B20, B23 or B25 form were homologation specials and not designed for road use primarily.

As for the 100bhp/litre. None of the M3 models ever reached this in factory spec. The closest was the M3 EvoII (non-cat) with 220bhp from 2302cc.

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Direct Link To This Post Posted: 11-November-2003 at 13:38
The only cars (M3 wise) to produce 100bhp/litre is the e36 M3 3.2 evo with 321bhp and the latest offering I expect.
& wasn't the M3 restricted to 2.3 and 2.5's? (and not 2.4).
Plus they gave somewhere between 195 and 230 bhp (dependent in what guise from the 2.3 and 2.5 engines as std)
The 'is' is a great alternative to the M3 and the 325, but the 325 is a great car on our roads, unstressed, and quite powerful, and sounds great whilst doing what it does!

Trouble is with having a car producing such huge amounts of power from a 'small' engine, is the mods needed will more than likely make the car undriveable on the roads, as a day to day transport.
The guy with the turbo'd 318 probably only uses it for the strip!
AG

Edited by M3AG
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