Re: [doc] Re: #2727 Twin Turbo Progress

[Martin Gutkowski - DMC Ltd <martin@xxxxxxxxxxxxxx>]

Hi Chris

It -does- actually have silencers. The tips are baffled and knock at 
least 30% of the noise off - we did try it without them and quickly 
replaced them!

The engine note is noticably higher because it's an even-fire, and the 
dump valve really tells you it's a different animal. When we get it 
fully mapped and going the way it should, I'm sure you'll see some video

Martin

Christophe Vieira wrote:

>Hello Martin,
>
>Really nice job...
>Does this engine runs with this exhausts setup ?
>Is it not too noisy without silencer ? I know that turbos reduce it
>but it must be very loud...
>
>Could you record a little video with a stock car and this one side by
>side to compare engine sound differences ?
>
>Best regards,
>
>Chris.
>
>
>--- In doc-uk@xxxxxxxxxxxxxxx, Martin Gutkowski - DMC Ltd <martin@...>
>wrote:
>  
>
>>Hi All
>>
>>Harking back to a week prior to Eurofest, I posted some photos of my 
>>friend Rich's #2727 twin turbo engine that we've been building. Quick 
>>synopsis: 2458cc Renault 25 Turbo even fire EFI engine built into 
>>DeLorean block with a couple of Alpine GTA bits and an Island twin
>>    
>>
>turbo 
>  
>
>>kit. We added a pair of intercoolers and just prior to Eurofest, fell 
>>foul of a dead turbo (mucho smoko). The project has been on hold while 
>>other tasks were cleared following three shows on the trot but in the 
>>past week, she's had a couple of donor turbos fitted from Mazda 323's 
>>(still the IHI RHB52 but water cooled - chosen for the capacity of the 
>>donor engine (1.5 litre) and the factory boost of 9psi). No photos 
>>because, frankly, it looks exactly mthe same as the ones I posted back 
>>then...
>>
>>http://www.delorean.co.uk/DSCN2233.JPG
>>http://www.delorean.co.uk/DSCN2234.JPG
>>http://www.delorean.co.uk/DSCN2235.JPG
>>http://www.delorean.co.uk/DSCN2236.JPG
>>http://www.delorean.co.uk/DSCN2237.JPG
>>
>>...but it sure as hell goes better.
>>
>>Currently we have the map that was created on the rolling road under 
>>normal aspiration, and an ignition map from some other engine set
>>    
>>
>with a 
>  
>
>>MAP limit of 2 bar (1 bar of boost). The MAP sensor Rich bought for the 
>>engine is from a Ford Cosworth and in calibration, we discovered it
>>    
>>
>will 
>  
>
>>actually measure nearly 20psi of boost despite being a 2 bar sensor (do 
>>you like the constantly flicking between bar and PSI? :-) The ecu we're 
>>using has an adaptive mode, and with the addition of a bosch wideband 
>>lambda sensor, does a remarkable job of writing its own map based
>>    
>>
>purely 
>  
>
>>on driving the thing.
>>
>>We decided to take the car on a 4 mile trip to the nearest petrol 
>>station and Rich drove while I watched the ECU outputs like a hawk.
>>    
>>
>This 
>  
>
>>was on the hottest July day since records began..... on a turbo car 
>>running high boost..... yikes. (just shy of 100F). I say Yikes
>>    
>>
>because I 
>  
>
>>have a live readout of Manifold Air Temperature and as the boost 
>>approached 15 psi (1 bar), the ECU was telling me we had air at nearly 
>>80 degrees C entering the engine (176F). I think those intercoolers are 
>>going to be moved downwards...
>>
>>After a bit of wastegate messing, we got it limiting at first 3psi,
>>    
>>
>then 
>  
>
>>8psi, then hitting the ECU's boost limit (set to 200kPa - well the 
>>software works in kPa - keep up!) at 5000rpm. Gutless at bottom end,
>>    
>>
>and 
>  
>
>>obviously in need of a proper tuning session, I am however happy to 
>>report that it shows all the signs of being a very quick car. The boost 
>>comes in at as low as 1200rpm, and will really benefit from an ECU 
>>controlled boost control valve to stop the wastegates opening at all 
>>till the target boost is reached - currently it's lovely and
>>    
>>
>progressive 
>  
>
>>but I'm sure we can gain some torque with more boost lower down in the 
>>revs.
>>
>>And much as I hate the film, the fast'n'furious dump valve noises
>>    
>>
>really 
>  
>
>>put a grin on yer face in a DeLorean :-D
>>
>>Martin
>>
>>    
>>
>
>
>
>
>
>
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