I know there was some talk a bit ago about when a GDI compatible system might come out, and I found this on the net today. Of course it's ridiculously expensive, but it shows something is being done. I do believe some of the parts may be available cheaper, like if you bought the high pressure fuel system off a wrecked car for example and only used the Bosch stuff to control it.
http://www.bosch-motorsport.de/content/ ... l/4063.htm
Also found a paper online that shows injector control characteristics, in case anybody was wanting to build their own controller....
http://opensiuc.lib.siu.edu/cgi/viewcon ... njector%22
Anyone looked at Bosch GDI systems yet?
- Jadewombat
- Posts: 1447
- Joined: Sat Jun 22, 2002 12:01 am
Re: Anyone looked at Bosch GDI systems yet?
Wow. Wonder what a 'stock' dual-port 1.6 would put out with DI. My 2007 Audi FSI suffers from carbon build-up. Did a service early this summer and they cleaned the TB and felt the power come back quite a bit. Lexus tried to get around this by running indirect secondaries to wash the back of the intake valves.
-
- Posts: 2433
- Joined: Wed Apr 13, 2011 1:01 pm
Re: Anyone looked at Bosch GDI systems yet?
i feel it will phased out like a phad.
look at the poor pump design, and the build up after only 10k miles.....
fit in with the modern cars you buy new, use for 3 years and get shot of. i dont think it would work well on a aircooled.....
your thoughts?
look at the poor pump design, and the build up after only 10k miles.....
fit in with the modern cars you buy new, use for 3 years and get shot of. i dont think it would work well on a aircooled.....
your thoughts?
-
- Posts: 3944
- Joined: Sun Apr 27, 2008 3:36 pm
Re: Anyone looked at Bosch GDI systems yet?
Yeah, I've been reading about the buildup. Any idea what causes it? I assume it's because there's no longer a spray of gasoline hitting the intake valve, keeping it clean. Could also be the fact that even with valve stem seals, there is a film of oil on the valves so it's possible dust/dirt is sticking to it? A few production vehicles have both DI and MPI (example Toyota's D4-S), which sounds like a good idea. Maybe for a turbo engine the manifold injectors could be used for meth cooling spray for the same cleaning effect, while fueling only with DI and gasoline? I imagine an engine like that would make quite a lot of power, even with a high static compression ratio.
- Jadewombat
- Posts: 1447
- Joined: Sat Jun 22, 2002 12:01 am
Re: Anyone looked at Bosch GDI systems yet?
Yes, this is the case--at least on my RS4. There's a PVC catch can on DI cars (most all of them) but they are of course not 100% at catching and keeping the oil mist from hitting the back of the hot intake/valves and crudding up. Even so, the power difference is significant. As far as automotive technology goes in recent years (somewhat recent--it really gained steam in the mid-late 90s in production cars, but I read a paper from the late 70s about VW doing the TDI back then) has really come up dramatically. Even if after 10K or 15K miles the power is down 5-10%, it's still way higher than IDI.miniman82 wrote: Could also be the fact that even with valve stem seals, there is a film of oil on the valves so it's possible dust/dirt is sticking to it?
Take for instance my wife's car, a 2007 Audi RS4. In 2007 you could buy the A4 with the 2.0T FSI motor, the S4, or the RS4. Both the S4 and RS4 had a 4.2L V8 (block is the same, intakes are very similar). The S4 is IDI, the RS4 was DI. S4 put out 340hp, the RS4 puts out 420hp.
Even the 2.0 FSI/TSI VW puts out is amazing, 200hp/211hp-207 ft./lbs. from a turbo 16V with variable intake valve timing.
http://en.wikipedia.org/wiki/List_of_Vo ... 28EA888.29
-
- Posts: 3944
- Joined: Sun Apr 27, 2008 3:36 pm
Re: Anyone looked at Bosch GDI systems yet?
200 from a turbo 2.0 isn't all that impressive, boost makes everything easy. RS4 sounds like a hoot to drive, I'd go through rubber real quick if I had one.