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5.9L cummins turbo

Old 01-13-04, 11:36 PM
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5.9L cummins turbo

Has anyone considered putting one of these in a rx7? its either a v8 or a rotary. I perfer a rotary seems to keep with the car. but if you were going to do something liek this why not put a strait six in it? sigh...
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Old 01-15-04, 03:54 PM
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I have considered it, but I don't have the money, and I SERIOUSLY dought there would be room without serious midification to the firwall.

Probably at least a 1/3 of the engine would have to sit threw the firwall.

But I like the straight six


If I ever get another beater RX-7, and an extra like 3 grand I'll try to do it, haveing a jake brake on an auto-X track would be to cool.....
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Old 02-12-04, 08:18 PM
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I'm just curious, what do you guys plan on towing with a cummins rx7???
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Old 02-13-04, 04:32 PM
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Ummmm guys the cummins block and accesories weigh 1100 lbs. They are a "true" diesel. Thats one of the reasons they last so long. Your Rx7 would hate you for it.

Last edited by t-von; 02-13-04 at 04:35 PM.
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Old 02-13-04, 04:59 PM
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It might hate you but those engines can put out over 1500 pounds of tourque and 1200+ hp with a big turbo and intercooler just look in some truck magazines they have full size diesel trucks running 13.00 with a twin turbo cummins the truck wieghed in at 8000+ lbs immagine cutting that down to around 3000 lbs you'd be fast and fuel effiecent
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Old 02-13-04, 07:51 PM
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****, I could haul around all kind of ***
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Old 02-15-04, 03:55 AM
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Originally posted by totallimmortal
It might hate you but those engines can put out over 1500 pounds of tourque and 1200+ hp with a big turbo and intercooler just look in some truck magazines they have full size diesel trucks running 13.00 with a twin turbo cummins the truck wieghed in at 8000+ lbs immagine cutting that down to around 3000 lbs you'd be fast and fuel effiecent

From a power stand point I understand your point, but how would you get the car back down to 3000lbs when your adding 1100 lbs of front end weight? The front end would never be able to support that kind of weight unless you seriously did some major mods. The weight alone would exceed the tire weight limits. Same with the rims that would actualy fit the hub. Oh don't forget about a complete custom suspension. I don't believe theres anything currently on the market that would work there. I use to sell Dodge Trucks. Have you guys ever noticed how much those front tires bulged on the bottom because of all the front end weigh of that diesel(and this is with heavy duty tires)? You would also have to add some weight to the back just to balance it out and get traction. I'm not trying to rain on you guys parade but, this would definatly be a "Monster Garage" type of upgrade.
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Old 02-15-04, 02:39 PM
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rims for a 5 lug would be no problem it's 5x4.5 same as a jeep wrangler and ford mustang
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Old 02-25-07, 10:19 PM
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Originally Posted by t-von
From a power stand point I understand your point, but how would you get the car back down to 3000lbs when your adding 1100 lbs of front end weight? The front end would never be able to support that kind of weight unless you seriously did some major mods. The weight alone would exceed the tire weight limits. Same with the rims that would actualy fit the hub. Oh don't forget about a complete custom suspension. I don't believe theres anything currently on the market that would work there. I use to sell Dodge Trucks. Have you guys ever noticed how much those front tires bulged on the bottom because of all the front end weigh of that diesel(and this is with heavy duty tires)? You would also have to add some weight to the back just to balance it out and get traction. I'm not trying to rain on you guys parade but, this would definatly be a "Monster Garage" type of upgrade.
Coming back down to reality now
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Old 03-06-07, 11:00 AM
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no it wont fit,

what trans would you use?? alison or dodge 5 speed.... way too big

weight will crush the RX7

torque will twist it like a soda can

so answer is probably most likely NO!!
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Old 03-06-07, 03:35 PM
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1200 HP Cummins or 1200 HP LSx. Hmm, let's think here...
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Old 03-08-07, 06:06 PM
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woot 2700rpm redline!
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Old 03-08-07, 06:16 PM
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I like the cummins alot, but are you serious?? The Rx-7 does not have some magical 4th dimension engine bay where a entire M1 Abrams tank will fit into it like a glove. I mean damn, wtf!
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Old 03-12-07, 09:14 AM
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A nice Brabus-tuned Mercedes CDI or Audi TDI diesel would be nice. 400+ ft/lbs of torque and 300+ HP.

:-) neil
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Old 03-13-07, 05:00 PM
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2.4 lt ford turbo deisel good for 200 bhp, small aluminum 4cyl block. Thats worth thinking about in the RX not a truck engine.

Nice thought but no matter how much power you have the car wouldn't be fun anymore because the handling would be rubbish.
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Old 04-19-07, 02:26 PM
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It was all sarcasm... I guess I need a disclaimer.

Originally Posted by GtoRx7
I like the cummins alot, but are you serious?? The Rx-7 does not have some magical 4th dimension engine bay where a entire M1 Abrams tank will fit into it like a glove. I mean damn, wtf!
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Old 04-19-07, 03:18 PM
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Originally Posted by GtoRx7
I like the cummins alot, but are you serious?? The Rx-7 does not have some magical 4th dimension engine bay where a entire M1 Abrams tank will fit into it like a glove. I mean damn, wtf!
cummins = overrated. even the jet engine like abrams power unit = overrated.

since you've summoned some theoretical physics like pocket dimension to house your engine...

sell your house and buy one of these:


why deal with 1200hp/tq when you could have tens of thousands of shaft horsepower? smoky burnouts all day long! and when the scientists see that you've miraculously managed to fit that chunky oaf in your small innocent engine bay you've got to win some sort of prize for physics. buy a new mansion, send the kids to purdue and drink daiquiris all day.
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Old 05-02-07, 09:29 PM
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Back to Earth now... I'll find something to put that big one into later...

I have the diesel for the RX, Isuzu 3.9! 4cyl turbo, sleeved block, parts at any GM truck dealer, its Jap., its light, about 300ftlbs of torque stock, adapter plates for any GM tranny, and Isuzu has been building diesels since the '30's. Don't use the stock Isuzu auto tranny,they suck.

Now that I'm thinking about it I have a 'vert roller laying outside the shop dying for something strange to be stuffed in it. It will go good with my biodiesel burning Dodge truck.
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Old 05-07-07, 12:38 PM
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The important thing you have to keep in mind is the stock subframe (fc) will collapse with more then an LS1, and even then the mounts are designed to spread the weight out over the subframe.
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Old 06-18-15, 08:48 PM
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I dont think the OP was referring to a cummins swap, i think he meant the turbo itself?
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Old 07-16-15, 12:01 PM
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Originally Posted by DankestKush View Post
I dont think the OP was referring to a cummins swap, i think he meant the turbo itself?
First...holy thread necro...and second im REALLY sure he was talking about putting in the Cummins 6BT engine. Read quote below from OP's first post.

Originally Posted by xfeastonarsex View Post
why not put a strait six in it?
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