if you have a turbo'd engine, is it better to have...

[Sjoerd320i]

lightend part's in it and on it?
like a lightend flywheel and a crankshaft like this


and thing's like lightend pistons and con-rods (if that's what they are called)

becauss I saw a mx5 a while ago with a turbo on it etc.. but totaly tuned with Jackson racing stuff and greddy turbo bits, but when he even touched the pedal the engine reved and when he gave it full throttle it almost hit the limiter straigt away, unbelieveble.
and I am sure that that is not just the effect of the turbo that was on it.

would be very very cool to have a six pot rev like that

[Turbo-Brown]

My thoughts on knife-edging as in the piccy are that the mass was there for a reason, and removing it is going to upset the balance of something, unless you can remove the requisite amount from the reciprocating masses.

I guess that lightening the bits of an engine could improve boost response, but if you're in gear at low revs and off boost, it's probably not gonna make all that much difference.

[Jhonno]

thing is with lightening a turbo'd lump is it drops off boost when you change gear etc.. unless you have antilag or summt

[Turbo-Brown]

Mmmmm, probably don't want to get into antilag on an engine that you use everyday. It's not very kind to exhaust valves, exhaust systems or turbos

[Jhonno]

Mmmmm, probably don't want to get into antilag on an engine that you use everyday. It's not very kind to exhaust valves, exhaust systems or turbos

exactly - dont think any significant lightening is worth doing on a turbo'd lump

[e30_Turbo]

I was under the impression that for everyday use L&B is a bit OTT. My *cough* xr3i (i was young ok ) had a lightened flywheel and complete bottom end lightened and balanced, she revved like a goodun, off the clock infact, but it made the engine weaker when pulling away and up hills and it became less driveable when pottering around. Went like a whippet on a couple of grams of speed tho, pity it was fwd and a ford

According to the tuning houses and engineers I've chatted too about having my M20 done said that BMW have such small tolerences on internal parts they advised not to bother, money best spent on headwork.

Yet another example of good old German over-engineering!!

L&B is a def for racing tho

[Turbo-Brown]

Wouldn't say the M20 was over engineered, just that they optimised one of the balancable (sp? is that even a word?!) engine configurations.

Afterall, t'would be a shame to have an inline6 engine and not have it run smoother than a rolex

[Sjoerd320i]

Hmm.. so i take it it's not worth the money, and maybe even drives better without the lightening it?

Is there a noticable difference in the reving with a turbo'd lump? (limit and how fast it reaches the limit)

[e30_Turbo]

Wouldn't say the M20 was over engineered, just that they optimised one of the balancable (sp? is that even a word?!) engine configurations.

Afterall, t'would be a shame to have an inline6 engine and not have it run smoother than a rolex

In relation to other lumps about in those days it was a mile ahead, not now in technology of course, very simple design, I'm sure you have a excellent understanding of it's internal workings so I should really bow down to your superiorness on this matter. I aint a wimp, but I know when I can't win
I just found it satisfying when the bloke at the engineering place said don't bother mate, they make them about spot on anyway, put some more faith in the old motor that did

p.s. How's it coming on?

[e30_Turbo]

Hmm.. so i take it it's not worth the money, and maybe even drives better without the lightening it?

Def worth doing if you wanna race, not normal everyday stuff really, but on track.....WOOHOOO!!

Is there a noticable difference in the reving with a turbo'd lump? (limit and how fast it reaches the limit)

Ow yes, as boost rises revs rocket up, under no load aswell, really quick

[Turbo-Brown]

In relation to other lumps about in those days it was a mile ahead, not now in technology of course, very simple design,

I just found it satisfying when the bloke at the engineering place said don't bother mate, they make them about spot on anyway, put some more faith in the old motor that did

p.s. How's it coming on?

It did raise a wry smile when I found out that the 205 1.9GTi engine is supposed to be in quite a high state of tune for a 2v/cyl road engine with 68bhp/litre, and then I found out that the 2.5 M20 also gets 68horsepoos to the litre......and can easily make more.......and sounds nice into the bargain

I'm still working on the throttle bodies at the moment. It seems to take about 3 hours to machine one of the tubes that the butterfly mounts into. Took a break from that tonight to make up a kind of load spreader for the two oil returns, but then realised I haven't got any nuts and bolts to fit them to the sump with

Anyhoo, engine goes back in next weekend (I really hope!)

How's yours coming along? Can't be long now can it

[e30_Turbo]

In relation to other lumps about in those days it was a mile ahead, not now in technology of course, very simple design,

I just found it satisfying when the bloke at the engineering place said don't bother mate, they make them about spot on anyway, put some more faith in the old motor that did

p.s. How's it coming on?

It did raise a wry smile when I found out that the 205 1.9GTi engine is supposed to be in quite a high state of tune for a 2v/cyl road engine with 68bhp/litre, and then I found out that the 2.5 M20 also gets 68horsepoos to the litre......and can easily make more.......and sounds nice into the bargain

I'm still working on the throttle bodies at the moment. It seems to take about 3 hours to machine one of the tubes that the butterfly mounts into. Took a break from that tonight to make up a kind of load spreader for the two oil returns, but then realised I haven't got any nuts and bolts to fit them to the sump with

Anyhoo, engine goes back in next weekend (I really hope!)

How's yours coming along? Can't be long now can it

Days now, MS is flying our way at the mo as soon as it passes through customs and arrives at Ant's I'm off down there to fit the bugger
BOV is on it's way, adjustable boost controller is in the post too......just a exhaust from down pipe to backbox needed now!!!

I'm hopeing hours....but days is looking more likley really......

TBH I've had all the bits for a while now, just changed my mind last min to go the MS route instead of the FMU or RRFPR route, not safe enough really, MS should mean peace of mind....so have waited longer for a better, more reliable system, for once I've been sensible!!

But it is hard to describe the excitment and anticipation that has been building since Sept last year. I need BOOOOST!!!

[Karan]

cant wait for these 2 to be done!!!!



..........damn i need to get the m5 beast done quick..... LOL

[Turbo-Brown]

After 5 months of carlessness, you're not the only one who can't wait for them to be finished!

[Karan]

my projects been going since the beginning of the year too....

just about 60% the way there i think.... its the preparation and research that takes ages.... especially with odd stuff like hydraulic boosters etc... and for all u turbo guys the plumbing must take ages