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linrick1

Twin Turbo E-9?

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Hey all, I have been kicking around the idea of installing twin turbochargers on our E-9 500. Before you all start yelling at me to not mess with it, I don't want to increase the boost pressure, I was thinking more along the lines of two smaller turbos with the same total output as the big single turbo. It would go something like this - we've got dual cowl mount air filters each plumbed to their respective turbo, the outputs of the turbos would be run through a y-pipe to a common air to air cooler and then to the engine. The exhaust would of course be independent, straight from each turbo directly to its own stack....straight stack of course. The goal here is not so much along the lines of improved performance but for the SOUND......the whistle of the twin turbos and then the staccato thump of that big 'ole V-8 pounding up a hard pull, plus I think you might be able to keep the EGT down a bit with the better better breathing and scavenging properties.....what do you think, good, bad, maybe? I'm interested to hear what you all think, Thanks , Rick

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Shure it will work fine and look cool :thumb: but I think you will just be adding more items to fail and extra weight.

Turbos are considered a muffling device to begin with so adding twins will not realy give the sound that you are looking for. I think that one single stack is louder than twins, maybe its just the way the pipe exits are pointed?. :idunno: The other issue is finding the correct turbos for each side of the engine. Most mack turbos I have seen do not have wastegates to control boost levels. i.e properly sized for the intended set up. with todays turbos advancements I think you could use a single modern turbo that has a waste gate to controll the boost level, reduce lag and improve air/exhaust flow. I have seen some of these new engines with turbos that alow air to "bypass" the compressor wheel to help with low end power. you can hear them spool quickly even at a low engine speeds. just another advantage with newer turbos. just steer away from last year turbos that Mack was useing on some of there engines. Many people had problems with them, and availibility was an issue also. Not entirely macks fault as its not there design but it kinda fell in macks lap as it was an item used on there engines.

just my .02

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Damn Man! Just knocked the wind right out of my sails.....what you are saying make perfect sense but yet somehow....

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I don't think it will improve that much the sound.. don't understand why put 2 of them if it's not for performance... cost lots of money, lots of try maybe to get the right set-up with your pump and good boost pressure... now they can take your old turbo and change the fan in it to make it more powerfull without getting bigger or anything..

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Damn Man! Just knocked the wind right out of my sails.....what you are saying make perfect sense but yet somehow....

:pat: not trying to bring your idea down, Im all for new and improved Mack power :thumb:

There is a formula that you need to use when looking for a diffrent turbo. It takes into account for volumetric efficency (sp?) Engine displacement, intake air temps, etc.... all this info is needed to find a turbo that will work for "x" Rpm range. Every turbo has a diffrent efficency island. This "island" is where the turbo performs its best without lag or choking exhaust. This "island" is important not just to exhaust flow but to how much heat it genarates that the Intercooler needs to remove. That what you need to know to find the proper turbo. its a complex formula that I cant fully explain myself. I have found some info searching thry google. Problem you may run into is that OEM mfg dont like to post Turbo maps for other companys to see and possible test with....basicly im saying good luck finding an oem turbo map LOL

With the turbo formulas found on car sites I was able to do a turbo swap on my car with much help from other hot rodders. I made a 2.0 liter turbo go from 160WHP to 260WHP with just a few mods and safety items. not big HP for the V8 guys but Its a sleeper to most sports cars on the road today and I can drie it to work with out worry!!!!

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The only advantage really to twin turbos if they are staged and you want to get higher boost pressures, whic would be pretty cool, but would take a lot of work you would be better putting the Holset turbo on it, and maybe some different injectors, then youd really have some power, and it wouldnt be near as much work as routing all oil, intake and exhaust

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Hino in Japan put twin blowers on their 360 Hp V8 engine, It is not quite as simple as it sounds. but they probably have their set up on a Hino website somewhere.

Nig :chili:

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all u need is a military spec. E9 they made 3 models for the gov. to put in tanks. They all have 4 turbos the first one is 750hp the 2nd one is 900hp and the 3rd one is 1000hp. all the did to get more power was add more fuel and more rpms thats it . I have this brocure my dad got from mack school years ago it shows every thing torque curves and all its cooll.

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what are you waiting for? we wantto see that brochure!

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