Thread: Kicking Ideas Around - Series 1 Turbo

Originally Posted by tangus89

I looked into it For my 2.6 also, but found that to run the 'draw through' (carb before compressor) setup the turbo would have to be mounted on the intake side to make much of an increase and reduce horrific turbolag.

Thanks - this is the type of information I was looking for - so you think the distance between the turbo back to the carby would be too long and cause considerable turbo lag - I did not think of that.

Looking at the arrangement on my diesel Freelander - even taking the intercooler out of the equation, the intake plumbing is over twice as long as it would be in a series one petrol and it does not suffer much in turbo lag - just allround lack of power but it is a diesel (actually the L series diesel would be a good conversion for a series 1).

So what about the engine internals - are they up to a bit of a boost?

Cheers

Garry

Well, as Tangus said, if you could set up a 'blow through' carb it would be easier plumbing, but pressurised carbs are a can of worms to make work.
Terry

The S1 engine, being cross flow design responds quite well to improvements in breathing......

The engine was popular for amateur racing pre war.

Anyone who has driven a S1 would probably have trouble with that concept.
Terry

Originally Posted by garrycol

so you think the distance between the turbo back to the carby would be too long and cause considerable turbo lag - I did not think of that.

Looking at the arrangement on my diesel Freelander - even taking the intercooler out of the equation, the intake plumbing is over twice as long as it would be in a series one petrol and it does not suffer much in turbo lag

Garry

Hey Garry

The S1 2L is similar to the 6 in design as far as i am aware??
intake-over exhaust-side valve? slanted head? I have never worked on one so I'm not sure.

Through my research, with the 'draw through' system you either have the turbo mounted on the exhaust manifold, or intake for a cross flow head.
Both positions have different sources of lag.

Mounted on the exhaust with the carby attached to the turbo, so the fuel/air mix has to travel through the turbo, (which i read somewhere can separate the mixture , not sure how true that is) then all the way to the intake manifold. Then only after it has started burning the turbo starts to spool up. so you get a moment where the fuelling is too rich and have all kinds of problems. I didnt see one turbo mounted that way, just people discussing it.

Turbo mounted on the intake manifold and the carb attached to it. That solves the fuel getting to the cylinders lag, but then you have a fairly large distance from exhaust mani to turbo (depending how you plumb it), which is another source of lag. Although nowhere near as bad as the exhaust mount

I hope that is of some help. Try doing a google search on it, there is lots out there.

Cheers
Tangus

Garry,
Get yourself a copy of "Turbocharging & Supercharging" by Alan Allard; ISBN 0-85059-494-4

The book was written in 1982 and contains everything you should wish to know, bearing in mind that modern turbochargers and their accoutrements have come a long way since 1982.

I found a copy on the internet for $10.

Use this search engine Duncan Grinnell-Milne: books by Duncan Grinnell-Milne @ BookFinder.com

Cheers Charlie

One of the members on lrsoc.com has supercharged his 1949 80"


What I are mostly been doin' today.....

There is a video to check out on YouTube.

Now that is a great looking setup.