1979 Rx-7 Turbo LS powered. - RX7Club.com - Mazda RX7 Forum

1979 Rx-7 Turbo LS powered.

Old 03-01-13, 12:55 PM
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1979 Rx-7 Turbo LS powered.

79 rx7 back halfed.
Alum Dash.
Currie 9 inch with 35 spine moser axles and spool
Competition engineering ladder bars and wheelie bars
Roll cage
29x12 Slicks
Kerkie racing
1/2" SS fuel system
12 Gallon Fuel cell
Magnafuel prostar 725 pump
2001 5.3 LS motor.
6.0 #317 Casting heads (mildy hand ported)
LS9 MLS Head gaskets
Zr1 LS9 cam
S400Sx3 75mm Turbo 1.10 AR T4 housing.
AEM EMS fuel management
120lb injectors
PowerGlide 1.76
PTC 9.5 converter


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Fabbed up Eng mounts.



Cut up and welded the 98 F-body stamped steel manifolds. Used a mig and tri-gas. Actually welded nice.

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Old 03-01-13, 12:56 PM
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Quick and dirty hotside with junky “T” merge.

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WG dump tube finished.

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Cleaned things up a bit and threw the ZR1 cam in. All the roller lifters looked good, gonna run them "as is" too. Got the new LS3 style cam gear with pick up installed. Going to run a LS3 style timing cover with cam pick up on the front.

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Hatch backs and fuel cells are a pain! No room under the cell, so I had to make a fire box.

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Old 03-01-13, 12:56 PM
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Long block

LS2 Timing cover w FWD cam pick-up is done.
ARP stud kit and LS9 7 layer MLS Hg's are all in and torqued.
Turbo oil supply done.

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IC mounted cleaned up Engine bay

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Random inter-cooler shot. (31x12x4)

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Final Pin.

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Old 03-01-13, 12:57 PM
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Welded up a little angle iron mount for the battery and test fit the hood. Plenty of clearance. also wired up the alternator charge cable (2g) and ground wire. Got the upper and lower radiator hoses, steam vent, throttle cable, and IAT sensor done. Went with the cheapo "golden rod" filter again. Installed and finished up the fuel return. Fuel plumbing is done.


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Finishing up the wiring now…

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Old 03-04-13, 07:31 PM
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awesome build!
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Old 03-06-13, 10:38 AM
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Wow. This is definitely going to be an adrenaline inducer! I'm surprised there's not a GNX motor in there. Is this the same car you were building the 12AT for a few years ago?
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Old 03-06-13, 11:09 AM
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Originally Posted by aws140 View Post
Wow. This is definitely going to be an adrenaline inducer! I'm surprised there's not a GNX motor in there. Is this the same car you were building the 12AT for a few years ago?
No, that car was rear ended and sold unfortunately. I bought this chassis as a roller from a guy in denver. He ran an SBC/th350 in it.

I’ll miss the 3.8’s, but my GN days are over. I just sold by black GN powered RX-7 (FC) last month. Parts are expensive and hard to find. Not to mention 1980’s technology,flat tappet cams, crappy flowing heads etc… The new LS motors are decades ahead of the old buick motors and can be picked up for 200-500 complete at most junk yards. Not to mention cheap used parts and current aftermarket performance parts.
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Old 03-06-13, 11:18 AM
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looks amazing!
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Old 03-09-13, 04:43 PM
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Great progress!
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Old 04-21-13, 09:37 PM
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Cruised around the block today and did a little trans-brake testing. Won't be long now!





Here is my fancy 4" necked down to a 2.5" muffler setup. I just welded around the body of the muffler. It' spretty quiet for a "race" car. You could easily have a conversation in it while cruising.

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I'll be running a 60mm wastegate like this as an exhaust cutout. I'd have it installed but the gate I was sent had a torn diaphragm.

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Old 04-22-13, 11:02 AM
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Good lord your car is a beast!
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Old 04-24-13, 08:47 PM
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What kind of track times are you looking for?
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Old 04-24-13, 09:54 PM
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Originally Posted by Netherlandrj View Post
What kind of track times are you looking for?
10 flat at 160... Until I get a real cage in it anyway.
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Old 04-28-13, 07:36 PM
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I'm calling the exhaust done. The new gate they sent me was crap as well. I used parts from the both of them to make one working gate. Not that it wasn't expected, but I wouldn't suggest "godspeed" products. They are pretty much crap. I also cut the supplied Wg spring in half and heated it with a torch to weaken it quite a bit. Shouldn't take much boost to open it.

Also installed an exhaust crank case evac kit. It's pulling vac at idle. And gets much stronger in the revs.

Heres the finished product.



Wrapped

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Video of the WG actuating with some shop air.



Hard to see but the evac kit is pulling vac at idle.

http://s17.photobucket.com/user/Hybr...b19db.mp4.html




Also got new window crank assys, glass, door handles And pop rivited some alum door covers on. Now both windows work on this "street car".

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Installed some $50 ebay coil overs to raise the front end a couple inches. While I was playing with the suspension I figure I should upgrade the brakes. Ordered a set of drilled and slotted rotors with some HAWK pads.

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Wrapped the dump tube and brake lines.

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Ordered a cheap ebay oil catch can. Came with no baffles. Was just straight in and out. Installed some brass SOS pads and tubing to help baffle the oil mist. Should work well now. I have the same setup on my other car. Not sure if I will even use it now that I am running an exhaust evac setup. If anyone wants It I'll sell it for $30.
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Old 06-06-13, 12:09 AM
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CF Hood finally came in. Got rid of the hood pins and installed a factory latch.

Just need to borrow some street legal tires so I can go try to tag this thing...


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Made another HVAC cold air intake too. I found you can pull the segments apart and add to them for one longer seamless piece. This also let me eliminate the “crinkled” end pieces. There’s even a rolled bead on the end for your couplers.

This one is hidden in the fender so I didn’t spend any time sanding it or trying to make it look pretty.

If you want it to look more professional you could try just enforcing the ends with glass/resin. Then dipping the whole assy in polyurethane. I think that would turn out slick.





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Old 06-13-13, 08:16 AM
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great work man that thing is clean. what are your goals for power output?
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Old 06-13-13, 09:16 AM
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Not looking to break any Hp records. Spent all the money on the turbo setup and car. Eng is a junk yard special $220. Hoping For about 600.
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Old 06-13-13, 02:19 PM
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Of all the legit reasons to not pass my out of state inspection they shot me down for no odometer today. Makes no sense to me. Inspector told me it didn't even have to work. Suppose I'll count myself lucky and velcro on on the dash for a day.
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Old 07-07-13, 03:52 PM
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Anytimes with the new set up?
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Old 07-07-13, 06:48 PM
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Originally Posted by sandbag View Post
Anytimes with the new set up?
First night of real tuning at the track was this past friday. Started out running 11's. Last pass it went 9.83 @ 143. Shifting at 5400rpm. 5400rpm thru the traps as well. 17lbs of boost.

If it holds together It's got alot of room for improvement.

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Old 07-13-13, 01:26 AM
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Make that 9.66 @144.6

18.5lbs. 15* timing Started dropping speed at 19.5lbs, I think my super quiet exhaust may be killing me. May make a quick 4" DD with no muffler and give it a go. The timing dropping so low may be killing me as well. Only got 3 runs in.

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Old 07-13-13, 02:11 AM
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Old 07-20-13, 05:09 PM
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Getting faster... 9.4 @ 147!

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Old 07-20-13, 06:54 PM
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O_o

That thing is a goddam spaceship!
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Old 07-20-13, 07:54 PM
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Originally Posted by TheAnalogKiddd View Post
O_o

That thing is a goddam spaceship!
Space shuttles is getting hard to slow down! The stock SA brakes might not cut it much longer.
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