Just popped in my head the other night. is it at all possible to run a supercharger with twin turbos???
Yes, it is entirely possible. There was a car at the Detroit Autorama that had two Garrets feeding a 6-71. Pretty nasty. He said he was able to get 30 psi out of it
I read about a 512 Ferrari many years ago that Bob Norwood did, it had quad turbo's and a supercharger. It had a common pressure box and special computers that used the superchager on the the low end and then a clutch disengaged and switched to the turbos in 2 stages as each pair got spooled up.
i worked on m109 sp 155 guns that had a turbo on each bank feeding a 8-71 roots blower on a v8 desiel.
A guy did it in the 80's I think his name was Rick Dobbertin or something like that....a prostreet monza?
I think it's for the "Wow!" factor at shows. Single turbo and supercharger applications running cars as fast as you want to go now.
It was very common in the days of the Group B cars in WRC to run a turbo and Supercharger. The blower made instant low end power and the turbos made big top end power. Do a google search on group B rally cars or the "killer B's" and you'll see some wild stuff
Nitrous not only adds power it also cools the intake air/fuel charge the byproducts of it's combustion helps stop detonation
Too funny, do you tour? Turbos and blowers work just fine together. So do turbos and other turbos as in compound turbos, the Dodge Cummins and Toyota Supra guys are all over this. The reason for doing something like this is to overcome what people consider turbo lag. Using a large frame turbo and large exhaust housing that flows really well may not start making boost untill 3-4-5K in the RPM range. That's called boost threshold, it's the point where you are flowing enough air through the engine for the turbo to start working. Adding a blower, specifically a positive displacement type would reach that boost threshold much quicker. A blower is nothing but a compressor, regardless of what the atmospheric pressure is on the front end, the back end will get compressed. You can cram as much air into an engine as you want provided it's built to take it. And they can take a whole lot!
Nitrous? Shit man, lets use nitro!!!!!!!!!!!!! Two turbo's pushing through a 1071 on 98%......bitchin man
No you are wrong....... As a two stroke Diesel engine cannot naturally aspirate (draw in) intake air, a blower is necessary to provide sufficient air to scavenge exhaust gasses from the cylinders and support combustion. Later high performance versions were available with turbochargers[, and turbochargers with aftercooling the turbochargers discharging into the Roots blower intake. Read up.... http://en.wikipedia.org/wiki/Detroit_Diesel_Series_71 I used to work on the pieces of shit ...i should know
Not HAMB friendly but there was a 9 second GTP running a stock block a 72mm turbo through the M90 SC. It ran 9's pretty impressive. I know they turbo'ed the 2 stroke Detroit's but all I've seen on fire trucks in our shop were called naturally aspirated engines...which have just the blower. Confusing Love the cackle of a 2 stroke Detroit.
Fair enough...I did google them... those things are dinosaurs...the Detroits used in todays equipment that I work on in the mines all have turbos only. My bad...I have been working on diesels in the mines for 18 years, and never seen one of these early Detroits...not even in trade school. They obviously must have been garbage, as they didn't leave a lasting impression. As far as the original question, it seems that the turbo in this application, was to mearly help the engine fire up, so that the blower would turn over and then take over boost. They did not act together for extra boost or power, just start up.
8V92 Detroit diesels had twin turbos feeding the blower. The blower was mearly to make the engine idle, and the turbos would build up more boost than the blower.
if you put nos on a turbo motor you wana hope its a strong otherwise BANG boost pressure goes up evan more
Those 2- stroke Detroit can sing. The oil patch uses them in alot of trucks,pulling units. You should listen to one when they are pulling pipe out of a deep well .They take alot of abuse and mark their spot like a old Harley .
I have been fitting blowers AND turbos to engines for a great many years with great success. This is now commonly referred to as "twincharging". Had a thread going on the "engineers forum" a while back, which might answer some of your questions. http://www.eng-tips.com/viewthread.cfm?qid=174690
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