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 >> >> >> > > > > > > >DOC UK Website: www.deloreans.co.uk >Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx >** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine ** >Yahoo! Groups Links > > > > > > > > > [Non-text portions of this message have been removed] DOC UK Website: www.deloreans.co.uk Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx ** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine ** Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/doc-uk/ <*> To unsubscribe from this group, send an email to: doc-uk-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/