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rx3 street/strip build

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Old 08-08-11, 03:39 PM
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rx3 street/strip build

I bought this car back in 2006, i started doing a backhalf/4link conversion but the project was too big for me at that time since i had pretty weak fabrication experience, now a few years/cars later i feel im finally ready for this car (well, we'll see )

the car is a rust free -73 rx3, pretty rare here in sweden, only a handful that still is on the roads.. since i've already put the saw in it i thought i'd make a fun street/strip car out of it.. with the goal of having a street legal car, drive it to the events, run a 9 sec slip and then drive back home..

i have a a 13-rew engine and a fd tranny that i will use, engine management will be autronic sm4. 9inch rear, 4 link suspension.

im no expert what so ever so feel free to comment and help..

rx3 see the light for the first time in years.

time to take it to the garage!


first task was to determine ride height and put the chassis straight in all directions.



then i took alot of measures so i could put together a drawing for the rear suspension..



When i felt i was ready i finally could start fab the parts step by step.. here is the new crossmember




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Old 08-08-11, 03:41 PM
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the frame rails for the shocks and front 4 link brackets



both frame rails welded







strange 9" housing


This is what i have done in the past few days, i will post updates when i get something done :-)
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Old 08-08-11, 03:51 PM
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Nice Welds!
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Old 08-08-11, 04:55 PM
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Sick **** bro!
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Old 08-08-11, 05:53 PM
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I wish I could weld like that. I will get there one day. Nice work!
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Old 08-09-11, 04:32 AM
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Originally Posted by cfamilyfix View Post
I wish I could weld like that. I will get there one day. Nice work!
You will definately get there! Make sure you prep the pieces and make them fit 100%, it is easier to weld if you have good joints. The hardest part is not the weld but making the metal not distort/warp during welding, it is a time consuming work since you only can weld a few inches at the time and also need to think abou welding in the right sequence to make the shrinking forces pull against each other.

Im still learning these things, hopefully i can weld even better when this is done

Thanks for your comments.
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Old 08-09-11, 11:55 AM
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The build is nice, just like your fd.
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Old 08-14-11, 07:12 AM
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Subscribe'd :P
I will soon start my project again, and we shall put our brains together again
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Old 08-14-11, 11:38 AM
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Awesome work and craftsmansip..
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Old 08-17-11, 10:05 AM
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make 2 of everything and ship the extra set to me! Thats the same reason mine is still sitting under a cover 2 years later



Looking geat man!
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Old 08-19-11, 01:30 AM
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She seems to be in good hands. Keep on keeping on
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Old 08-21-11, 04:42 AM
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thanks guys,

I havn't had time to work on the car for some time but yesterday i welded the frame into the car and added some tubing.. also did some cutting to make room for bigger tires, the rear guards needs some work.. not in best shape.





I also bought an old CNC milling machine... my ambition is to make some fun custom car parts.. :-)

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Old 08-28-11, 01:29 PM
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did some work today, this is very time consuming.. takes a lot of time to fit and weld since you dont want to warp the thin metal.

right side is done.




left side tacked ready for welding



when this is done i can center the tires and take measures for my 4 link bars.
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Old 08-28-11, 06:53 PM
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Finally!!!! A nice build thread, Keep up the good work...
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Old 08-29-11, 01:30 AM
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7s before paint!!!
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Looks great so far! That's the best way to learn, just jump in and give it a try!
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Old 08-29-11, 01:20 PM
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nice rx3 love the way you stretched rear qaurters
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Old 08-29-11, 11:20 PM
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Car looks awesome!!!!
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Old 09-07-11, 12:46 PM
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Nice work
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Old 09-08-11, 01:19 AM
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Thumbs up

Originally Posted by gusfd3s View Post
You will definately get there! Make sure you prep the pieces and make them fit 100%, it is easier to weld if you have good joints. The hardest part is not the weld but making the metal not distort/warp during welding, it is a time consuming work since you only can weld a few inches at the time and also need to think abou welding in the right sequence to make the shrinking forces pull against each other.

Im still learning these things, hopefully i can weld even better when this is done

Thanks for your comments.

VERY IMPRESSIVE!!! Like what you've shared so far, can't wait to see how the project finishes up!

If you don't mind me asking, I was wondering what you used to make the sub frame out of :

1018 Steel? Gauge of material? and what you cut the material with? CNC, Waterjet, Laser, or Plasma cutter?

Oh yeah, one more thing. What type of welder are you using? Something like a Miller Aerowave / Dynasty Inverter?

Thanks in advance and look forward to seeing your next post!
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Old 09-08-11, 03:10 AM
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looks nice bro, keep it up...
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Old 09-08-11, 03:29 PM
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Originally Posted by rotorholic View Post
Finally!!!! A nice build thread, Keep up the good work...
Amen to that!

Everyone is tired of seeing Wacky put on new zip ties on his rx3 every other week.
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Old 09-09-11, 03:23 AM
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thanks guys!!

the material of the frame is S355J2H, all the cutting is by hand with a small cutting machine and a band saw machine.

Im using a no-name china tig welder

havn't done much for the last 2 weeks, been working on my CNC milling machine.



my new 28" wheels



Originally Posted by NEthingJDM View Post
VERY IMPRESSIVE!!! Like what you've shared so far, can't wait to see how the project finishes up!

If you don't mind me asking, I was wondering what you used to make the sub frame out of :

1018 Steel? Gauge of material? and what you cut the material with? CNC, Waterjet, Laser, or Plasma cutter?

Oh yeah, one more thing. What type of welder are you using? Something like a Miller Aerowave / Dynasty Inverter?

Thanks in advance and look forward to seeing your next post!
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Old 09-09-11, 03:38 AM
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Originally Posted by gusfd3s View Post
did some work today, this is very time consuming.. takes a lot of time to fit and weld since you dont want to warp the thin metal.

right side is done.




left side tacked ready for welding



when this is done i can center the tires and take measures for my 4 link bars.
WOW you just don't know how many times i have dreamed about doing this to my 3. But it is definitively not as easy as it looks. Some day I'll get to it... my intentions are to increase wheel well, but not do a 1/4 chassis just an intergrated four link to a stock chasis. Very nice work keep it up!!!!!!!!!!!!!!
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Old 11-04-11, 04:11 PM
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been doing some drawings on the new front suspension, i dont trust the stock one with some power behind it. I will try to make new struts, spindle, lower control arms and convert to steering rack.

http://www.youtube.com/watch?v=Fy6eq92dfcY
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Old 11-04-11, 04:23 PM
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7s before paint!!!
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Very nice! I never was really happy with the way i modded mine and plan on switching it up next winter.
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