Curb Weight for your finished LSx Conversion? Any 92+ RX7, 3rd or 2nd Gen Miatas,etc?
01-02-2008, 03:17 AM
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Curb Weight for your finished LSx Conversion? Any 92+ RX7, 3rd or 2nd Gen Miatas,etc? I wanted to know the final curb weights of your LSx conversions once you have completed and weighed them.
What year, make, and model and curb weight did you start with?
What did you delete, what exactly did you add, and what was the final curb weight?
I have been toying with the idea of building a small and ultra-light weekend toy that would run the most powerful n/a LSx based engine I could find.
I have always been in love with the 92+ RX7 and liked convertibles.
So, I thought maybe a 3rd Gen hardtop convertible Miata with a 447ci or larger all aluminum LSx engine would be the ultimate for road and track.
But, I really want to know how much less a LSx Miata would weigh as compared to just starting with a C5 or C6 targa.
Thanks for any info.
What year, make, and model and curb weight did you start with?
What did you delete, what exactly did you add, and what was the final curb weight?
I have been toying with the idea of building a small and ultra-light weekend toy that would run the most powerful n/a LSx based engine I could find.
I have always been in love with the 92+ RX7 and liked convertibles.
So, I thought maybe a 3rd Gen hardtop convertible Miata with a 447ci or larger all aluminum LSx engine would be the ultimate for road and track.
But, I really want to know how much less a LSx Miata would weigh as compared to just starting with a C5 or C6 targa.
Thanks for any info.
01-02-2008, 07:22 AM
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I haven't gotten around to weighing mine yet, but plenty of people have over at www.v8rx7forum.com . You can find answers to all of your normal questions about RX7 swaps there. The 3rd generation RX7s were sold from 93-95 in the US and the chassis code is fd3s or just fd for short which might help you while searching.
01-02-2008, 01:35 PM
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Thanks for the replies guys!
Please keep them coming.
I'm trying to decide if the smaller size and weight of the FD RX7 or 3rd Gen Miata Hardtop is worth the trouble of skipping a C6 coupe or C5 ZO6 for my BIG motr project.
I want to go with the most powerful, all aluminum engine possible that still will be "friendly" for weekend street driving.
http://www.v8rx7forum.com/v8-rx7-tec...fter-swap.html
http://www.v8rx7forum.com/v8-rx7-tec...fd-weight.html
Please keep them coming.
I'm trying to decide if the smaller size and weight of the FD RX7 or 3rd Gen Miata Hardtop is worth the trouble of skipping a C6 coupe or C5 ZO6 for my BIG motr project.
I want to go with the most powerful, all aluminum engine possible that still will be "friendly" for weekend street driving.
http://www.v8rx7forum.com/v8-rx7-tec...fter-swap.html
http://www.v8rx7forum.com/v8-rx7-tec...fd-weight.html
Last edited by TT C6; 01-02-2008 at 02:54 PM.
01-02-2008, 09:41 PM
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a copy out of one on my post.
i have since taken out just a few more things (power antenna, spare tire, jack and a few brackets and with a 1/8 tank gas) and the weight was 2840 IIRC.
i think the 240 and the rx7 are very close in weight so maybe it will give you an idea.
i put the car on the scale today. was alittle heavier then i was hoping but the front/rear %'s was pretty nice. alittle info first so you will know what was on the scale. the car is a stock 95 240sx se (loaded but with no sun roof). ls1, t56, j30 rear end, steel drive shaft, no a/c compressor, no a/c coil, no heater coil, no fan (for heat,a/c) fake glove box (just the cover is on, almost everything was taken out under the dash), long tube headers to 3" to y-pipe to 3.5" to a bullet style muffer,5/8 of a tank of gas. battery in the trunk and a empty no2 bottle. the only thing in the car that didnt need to be there was my lunch box (i gotta eat) and every fluid a car would need and a few little misc things. if my math is right the front/rear % is, front=53.42%, rear=46.58%. front is 1560, rear is 1360, total is 2920. take out the misc stuff and it will put it right back to stock weight, 2880. maybe will answer a few peoples questions about weight.
i think the 240 and the rx7 are very close in weight so maybe it will give you an idea.
01-02-2008, 10:04 PM
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I have a 1978 Chevy Monza. It weighed 3000 stock without driver. I traded out the iron head 350 for a '98 LS1. I took out the power steering, power brakes and deleted the A/C. I also did light weight wheels and tires. I'm going to end up around 2700 with a few more weight saving tricks.I'll have exact weight of the swap in the spring.
01-03-2008, 12:58 AM
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This pic was from right after the retrofit... alot of changes since then, and more changes being done right now
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01-03-2008, 02:22 AM
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Since that pic, the engine is moved another 4" back, front wheels another 6" forward (changing of Aarm angles). Even without those adjustment, the front of the block was at least 10" behind the centerline of the front wheels. My butt sits directly in front of the rear axle, about 9" forward of it. It'll be a couple of months before the car is back together again, but I'll be very surprised if weight distribution is not close to 50/50.
You can buy s2000 powered WCM Ultralites. Very capable car.
I think my car does OK. Here are results from a group meet autox (http://etrscca.org/soloii/results/2007/7s_event_raw.htm). 35 cars, 22 of them where lotus 7 variants. Placed 9th - but highest place finish of any car NOT running slicks. After the meet I found out in my rush to get the car finished and down there, that I forgot to realign after resetting ride height to get her on the trailer, so I ran the whole autox with zero camber.
01-03-2008, 08:00 AM
#10
I like the Lotus Replica 
Here are the numbers for my car https://ls1tech.com/forums/showthrea...010&highlight= The LS swap weighs around 50 lbs less than the stock car
Here are the numbers for my car https://ls1tech.com/forums/showthrea...010&highlight= The LS swap weighs around 50 lbs less than the stock car
01-03-2008, 09:12 AM
#11
kit car picture of mine attached. 900kg all up 
engine is an Ls1, dry sumped, tubular headers, GM performance inlet manifold single plane, demon 750cfm carb, MSD ignition, 220/220 cam, uprated valve springs retainers and pushrods. 5 speed manual box with triple plate clutch.
i'm about ready to fire it up very shortly for the first time. hopefully power to weight will be sufficient !
engine is an Ls1, dry sumped, tubular headers, GM performance inlet manifold single plane, demon 750cfm carb, MSD ignition, 220/220 cam, uprated valve springs retainers and pushrods. 5 speed manual box with triple plate clutch.
i'm about ready to fire it up very shortly for the first time. hopefully power to weight will be sufficient !
01-03-2008, 11:04 AM
#12
Why MUST it?
Since that pic, the engine is moved another 4" back, front wheels another 6" forward (changing of Aarm angles). Even without those adjustment, the front of the block was at least 10" behind the centerline of the front wheels. My butt sits directly in front of the rear axle, about 9" forward of it. It'll be a couple of months before the car is back together again, but I'll be very surprised if weight distribution is not close to 50/50.
You can buy s2000 powered WCM Ultralites. Very capable car.
I think my car does OK. Here are results from a group meet autox (http://etrscca.org/soloii/results/2007/7s_event_raw.htm). 35 cars, 22 of them where lotus 7 variants. Placed 9th - but highest place finish of any car NOT running slicks. After the meet I found out in my rush to get the car finished and down there, that I forgot to realign after resetting ride height to get her on the trailer, so I ran the whole autox with zero camber.
Since that pic, the engine is moved another 4" back, front wheels another 6" forward (changing of Aarm angles). Even without those adjustment, the front of the block was at least 10" behind the centerline of the front wheels. My butt sits directly in front of the rear axle, about 9" forward of it. It'll be a couple of months before the car is back together again, but I'll be very surprised if weight distribution is not close to 50/50.
You can buy s2000 powered WCM Ultralites. Very capable car.
I think my car does OK. Here are results from a group meet autox (http://etrscca.org/soloii/results/2007/7s_event_raw.htm). 35 cars, 22 of them where lotus 7 variants. Placed 9th - but highest place finish of any car NOT running slicks. After the meet I found out in my rush to get the car finished and down there, that I forgot to realign after resetting ride height to get her on the trailer, so I ran the whole autox with zero camber.
Wow you've done a lot more than just make some custom mounts and throw an ls1 in there. Yeah it deff should be 50/50, Thats awsome.
01-03-2008, 11:20 AM
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picture of mine attached. 900kg all up
engine is an Ls1, dry sumped, tubular headers, GM performance inlet manifold single plane, demon 750cfm carb, MSD ignition, 220/220 cam, uprated valve springs retainers and pushrods. 5 speed manual box with triple plate clutch.
i'm about ready to fire it up very shortly for the first time. hopefully power to weight will be sufficient !
engine is an Ls1, dry sumped, tubular headers, GM performance inlet manifold single plane, demon 750cfm carb, MSD ignition, 220/220 cam, uprated valve springs retainers and pushrods. 5 speed manual box with triple plate clutch.
i'm about ready to fire it up very shortly for the first time. hopefully power to weight will be sufficient !
BTW, in my search to find the correct spelling of ménage à trois I used Wikipedia. Do yourself the favor and don't search for threesome. The picture they have is not the threesome I was expecting.
01-03-2008, 12:27 PM
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I was thinking about the lotus, was about to post up about yours 99c5vert, and then saw your post as I scrolled down.
I wanted a Brunton SuperStalker and give it a whipple on top of that L67 motor, but after seeing your car on Jalopnik, I don't think I could go for anything else!
I wanted a Brunton SuperStalker and give it a whipple on top of that L67 motor, but after seeing your car on Jalopnik, I don't think I could go for anything else!
01-03-2008, 01:11 PM
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I was thinking about the lotus, was about to post up about yours 99c5vert, and then saw your post as I scrolled down.
I wanted a Brunton SuperStalker and give it a whipple on top of that L67 motor, but after seeing your car on Jalopnik, I don't think I could go for anything else!
I wanted a Brunton SuperStalker and give it a whipple on top of that L67 motor, but after seeing your car on Jalopnik, I don't think I could go for anything else!
SuperStalkers are great cars. Simple and FAST. The top guy in the autox link I posted ran a superstalker. He finished 2nd, a fraction behind a Formula Ford in the autox.
My car will always be a work in progress, simply because I can't leave it alone.
If I were in the market for a new 7 replica today, SuperStalkers will be on a very short list.
01-04-2008, 07:59 AM
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Is that a one off? Looks like a ménage à trois between a Daytona Coupe, Miata, and Spec Ford racer. Kinda cool in an all out track sense.
BTW, in my search to find the correct spelling of ménage à trois I used Wikipedia. Do yourself the favor and don't search for threesome. The picture they have is not the threesome I was expecting.
BTW, in my search to find the correct spelling of ménage à trois I used Wikipedia. Do yourself the favor and don't search for threesome. The picture they have is not the threesome I was expecting.
Why would they even put that?!
01-04-2008, 09:23 AM
#20
Just for the record, we weighed out LS1&T56 on 3 scales. The drivetrain was complete with engine, harness, intake, all front end accessories (alt, a/c, ps pump) T56 with 4qts Dexron and our engine mounts. All-up weight was 603 lbs, with 260lbs at each engine mount and 83lbs on the tranny mount.
See the bottom of the page at: http://forums.bimmerforums.com/forum...=699289&page=5
See the bottom of the page at: http://forums.bimmerforums.com/forum...=699289&page=5