Turbos stuff.

[Nick Tomlinson <nickandkathryntomlinson@xxxx>]

Hi Dan, exactly. At least you've modded the car in the right way and not done a back-street-bodge.
 
I bet the insurance is a bit nasty though !
 
I have this feeling I want to write the software to control the 'D'. The lambda ecu is too overdamped in response to the feedback and so oscillates. This causes the idle responce to go up and down because of the go-rich go-lean response and the idle ecu tries to correct accordingly, especially during warm-up. The O2 tries to compensate for an engine that has not warmed up.I may try and but a thermo-switch inine with this sensor so that it come son later. If I leave my O2 sensor disconnected it warms up great without stalling. I may just leave the thing disconnected...
 
Nick.

Daniel Willis <danielpwillis@xxxx> wrote:
Hi Nick,

Yuk... bleed valves are nasty! "Ok lets trick the ECU in to letting the 
turbo boost uncontrolably!" - erm.. nah. That used to be the trick even for 
Turbo's like mine, but now I can double the engine power for £800... safely 
too (before anyone thinks "bodge"!). New ECU, intercooler, injectors, fuel 
pump, fuel pressure regulator, actuator etc... makes for an interesting 
drive I can tell you! Quicker than my 911 in fact...

Dan


>From: Nick Tomlinson 
>Reply-To: doc-uk@xxxxxxxxxxxxxxx
>To: doc-uk@xxxxxxxxxxxxxxx
>Subject: Re: [doc] Re: A few questions
>Date: Mon, 21 Jul 2003 14:31:18 +0100 (BST)
>
>Hi Dan,
>
>Your car sounds great, I love those variable boost dials you can turn to 
>increase the boost. Beats my boring Astra diesel anyday (but it has stopped 
>me getting more points on the license !)
>
>A friend of mine once used a fish tank valve to act as a bleed off to the 
>wastegate. I told him not to do it and it resulted in a holed piston. £3 
>valve cost him a new engine and gearbox (Metro Turbo).
>
>Nick.
>
>Daniel Willis wrote:
>Hi Nick,
>
>Yeah I knew that was your point.. I just think turbos without intercooling
>is a waste of time! Large intercoolers (hell, any intercooler/chargecooler)
>will help keep temps down. Otherwise they skyrocket and you might as well
>not bother with the turbo at all.
>
>My engine only had problems because the waterpump on that particular engine
>runs on the same belt as the crank. The waterpump seized and the result was
>a few damaged valves. Nothing too serious - just expensive.
>
>Turbo-wise mine is just fine. Variable boost allows 0.4psi to 24psi at the
>flick of a switch. 4x4 helps keep it nailed down and a 6 speed 'box means
>175mph.... not that I'd try it.
>
>The best/only way to go turbo'ing the D is to dump the engine and buy
>something else (Alpine/25 turbo)
>
>Dan
>
>
> >From: Nick Tomlinson 
> >Reply-To: doc-uk@xxxxxxxxxxxxxxx
> >To: doc-uk@xxxxxxxxxxxxxxx
> >Subject: Re: [doc] Re: A few questions
> >Date: Mon, 21 Jul 2003 10:56:29 +0100 (BST)
> >
> >Hi Dan, that's my point about requiring an intercooler !
> >
> >Nissan 1.8 turbo's engine don't use one either.
> >Didn't you have trouble with your calibras engine at one point?
> >Even my crappy daily runner White Astra saloon 1.7 Turbo Diesel has an
> >intercooler and that's just running 0.6bar.
> >
> >It's be interesting to write the software to control the 'D's engine. I'm
> >looking to see if I can get 12volt PLC's (Programmable Logic Controller) 
>as
> >this is what I program at work as well as other things.
> >
> >Nick.
> >
> >Daniel Willis wrote:
> >Heh.. I'd love to see a non-intercooled turbo running 0.8bar on a hot 
>day!
> >That'd be hilarious!
> >
> >I upgraded my Calibra's intercooler to nearly 10 litres and push 1.5bar 
>to
> >make 320bhp - regarless of weather. THAT'S fun!
> >
> >Dan
> >
> >
> > >From: Nick Tomlinson 
> > >Reply-To: doc-uk@xxxxxxxxxxxxxxx
> > >To: doc-uk@xxxxxxxxxxxxxxx
> > >Subject: Re: [doc] Re: A few questions
> > >Date: Mon, 21 Jul 2003 10:24:17 +0100 (BST)
> > >
> > >Hi, of course the turbo on this type of engine is a bodge as it was an
> > >afterthought to try and increase the engine power prior to the release 
>of
> > >the Twin-Turbo. The engine is a V6 where the V is space 90 degrees 
>apart.
> > >The V should really be 60 degrees for the pistons to be equally spaced
> > >apart. (Originally the engine was designed to be a V8 but the oil 
>crisis
> > >made them chop 2 cylinders off!) The top of the distributor looks wierd
> >as
> > >the HT points are not equally spaced apart. This is because the firing
> > >stroke is not even. The engine will run but the result is an unequal
> > >balanced engine with not the best gas-flow in the world. The Renault
> >turbo
> > >and delorean turbo would have to have its innards (crank) re-designed 
>to
> > >give equal firing to make the gas flow a lot more even to satisfy the
> >turbo
> > >design. Oh I sound boring now....bla bla bla....Another thing about the
> > >turbo's is that there is no air-air intercooling. If we consider Boyles
> >Law
> > >(ideal gas) Pv=nrt if the air pressure is
> > > increased for a set volume then there will be an increase in gas
> > >(simplification here I know as the volume in a cylinder changes due to
> >the
> > >stroke of the piston) and this can lead to high temperature detonation
> > >sproblems. If you have a look on the true delorean there are 
>intercoolers
> > >between the turbos and the inlet manifold. This also assumes that the
> > >air-fuel ratio at high revs with boost does not go lean. Some bodges 
>are
> >to
> > >re-enable the cold-start valve when full throttle is enabled (on vw
> >engines
> > >with k-jetronic for example). In my opinion (and its an opinion) the
> >boost
> > >pressure should not be more then 0.6-0.8Bar at sea level for a non
> > >intercooled engine. I could yap on about engines forever but I have 
>work
> >to
> > >do and I've just made myself sound like a v. sad man who doesn't get 
>out
> >a
> > >lot which is not true (I take train numbers down in the evenings, ONLY
> > >KIDDING !)
> > >
> > >Nick.
> > >
> > >Martin Gutkowski wrote:
> > >I would love to see a photo. I've worked on Rich's engine and know some
> > >of the ins and outs of turboing these DeLorean engines (albeit that
> > >they're all bodges). It sounds like you might have something 
>interesting
> > >there.
> > >
> > >Does it really have a new intake manifold, or just the bit in the 
>middle?
> > >
> > >Oh, and Reno is a place in Nevada, where one of the gold DeLoreans
> > >lives. Renault is the French car manufacturer from whom so much of our
> > >engines come.
> > >
> > >Martin
> > >
> > >
> > >Chris Parnham wrote:
> > >
> > > >Frenchy has a new inlet manifold and metering head. I suspect it's a
> >Reno
> > > >one, with its thin solid metal feed pipes.
> > > >
> > > > I still have the original metering head etc., but have not worked my
> >way
> > > >back from the Petrol tank yet.......lots of time.....I'm enjoying the
> > > >challenge......besides my special friend and skilled
> >electro-mechanical
> > > >engineer, Nick Tomlinson and his wife Katherine, will be over with
> >his
> > > >tool box tucked in his DeLorean bonnet in a few weeks. He will help 
>me
> > > >identify some of the dangling electrical connections and pipes.
> > > >
> > > > We will sort it out. I've already had it "popping and banging" after 
>a
> > > >fashion by dribbling petrol down the cold start intake.
> > > >I'm still polishing the water pipes and suspension......you don't 
>have
> >to
> > > >rush these things.
> > > >
> > > >Chrispy
> > > >
> > > >
> > > >
> > >
> > >
> > >
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