September 24, 2021, 02:46:47 PM

Author Topic: 1979 SA RX-7 LS Turbo Build (8.93 @ 153)  (Read 110172 times)

Offline forcefed86

1979 SA RX-7 LS Turbo Build (8.93 @ 153)
« on: February 21, 2012, 02:36:55 PM »
Plan is to keep it simple I picked up the chassis for 3k. Hoping to cycle junk yard LS motors through this chassis as they blow. I'll use arp head studs and GM MLS HG's. Keep Rpms low and boost high. E85 fuel. Only looking for 600-650 ftlbs. Won't be able to go much faster until I upgrade the cage. 


This is the new chassis.
79 rx7 back half car rolling chassis.
Currie 9 inch with 35 spine moser axles and spool
competition engineering ladder bars and wheelie bars
8 point roll cage
Tires 29x12
Front factory struts with power disk brakes
2840 lbs Race Weight with 200lb driver
Powerglide Trans

Only have a few poor cell phone pics to start with.

Chassis...



Motor mounts done, test fit 5.3 with ls1 pan. Looks like theres room for a turbo or two in there...



Tried all 4 different LSX manifolds. This is the onlyone that would fit on the driver side. And it's pretty tight. Probably end up making my own here. Still looking for some LS3 manifolds to try.




« Last Edit: November 02, 2013, 10:44:28 PM by forcefed86 »

Offline dream36realms

1979 SA RX-7 LS Turbo Build
« Reply #1 on: February 21, 2012, 03:09:49 PM »
Looking good man. There are two other of us 79 owners here and a few 80 owners and even more FB owners here.

This car looks to be a monster.


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Offline mobythevan

Re: 1979 SA RX-7 LS Turbo Build
« Reply #2 on: February 21, 2012, 03:17:30 PM »
I used a manifold flipped like that on my drivers side for my first attempt at the build.  It created several issues that I didn't like so I am changing now to the LS3 manifolds both pointing down. 

==86 FC 5.3 Drag Car, Powerglide, 8.8 TASA, MegaSquirt 3, S475, 9psi, E85==
    mobythevan1 on instagram
    First Turbo Drive: https://www.norotors.com/index.php?topic=5271.msg245290#msg245290

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #3 on: February 21, 2012, 04:02:41 PM »
Looking good man. There are two other of us 79 owners here and a few 80 owners and even more FB owners here.

This car looks to be a monster.


As light weight as it is, I hope I don't need a monster under the hood.  I think I could squeak by with a caged squirrel monkey. A good fart down the intake of any of the LS motors should put it in the low 10's...  :yay:

I used a manifold flipped like that on my drivers side for my first attempt at the build.  It created several issues that I didn't like so I am changing now to the LS3 manifolds both pointing down.

Any fitment pics on the LS3 manifolds? I was looking at the pacesetter ls3 mild steel headers. They are cheapish (around 230 shipped) and mild steel so I could cut them up if needed. Really wanted to get a test fit before ordering though!   

« Last Edit: March 15, 2012, 10:36:04 AM by forcefed86 »

Offline mobythevan

Re: 1979 SA RX-7 LS Turbo Build
« Reply #4 on: February 21, 2012, 04:06:00 PM »
Sorry, forgot to say I am switching to the LS3 manifolds on my FC.  The flipped manifold like pictured above worked for me, just caused issues with plug wire routing, heating of brake booster and a couple other heat issues.
==86 FC 5.3 Drag Car, Powerglide, 8.8 TASA, MegaSquirt 3, S475, 9psi, E85==
    mobythevan1 on instagram
    First Turbo Drive: https://www.norotors.com/index.php?topic=5271.msg245290#msg245290

Offline SSjon

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Re: 1979 SA RX-7 LS Turbo Build
« Reply #5 on: February 21, 2012, 10:39:40 PM »
This car is gonna be a beast! Great buy on the car and kudos pulling the old school 400 and TH350, LS power is the way to go.

I wish I could test fit my LS3 manifolds for you, more so for me lol
1980 RX7 GS SA22C LSx build in Progress
L33 T56 8.8

Currently in the 12's, and getting faster every year!

http://www.norotors.com/index.php?topic=7003.0


Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #6 on: March 11, 2012, 02:53:20 PM »
Little update. For the record neither the LS3 or the C6 manifolds fit well. The ls3 will bolt up but it has little to no clearance and points straight up.



With a torch and hammer the Fbody manifold fits downward and aft facing. It is pretty close to the steering box though. Do you think this is enough clearance?

Looking up from the bottom....



Looking down from top...



Thanks! 

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #7 on: March 15, 2012, 10:35:25 AM »
Missed a smoking deal on Davids TC76. Canít wait around on a turbo any longer so I just got off the phone with ďTurbodavesĒ. The BW S475 will be on the way today. Divided T4 1.10 A/R Smaller 83/74 exhaust wheel, 75/100 Comp wheel.

Also ordered crossover materials and flanges. Should be able to start the hotside next week. It will be Mig welded and ugly...  :D
« Last Edit: March 15, 2012, 01:15:49 PM by forcefed86 »

Offline cyipher

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Re: 1979 SA RX-7 LS Turbo Build
« Reply #8 on: March 15, 2012, 11:11:01 AM »
what did you pay for the turbo?

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #9 on: March 15, 2012, 01:16:20 PM »
Didn't end up using dave. After speaking with him it was $749 for the turbo. $149 for the upgraded t4. +tax = $950 + $50 shipping would have been about $1000.   

Literally 2 minutes after I made the above post I found this....craigslist AD. What are the chances!??  So I bought it $700 shipped instead.   :yay:

http://cincinnati.craigslist.org/pts/2892626514.html

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #10 on: March 28, 2012, 11:02:31 PM »
Got a little time to cut up and weld the manifolds. Used a mig 309L and tri-gas. Actually welds nice, for me anyway. Played around with the cast steel manifold too. It seemed to weld great.



Turbo arrived! Now I'm having space issues. No place for this thing, it's freekin huge!


Offline N2v8fcs

Re: 1979 SA RX-7 LS Turbo Build
« Reply #11 on: March 30, 2012, 06:22:07 PM »
will it all fit under the hood?
:drive:
new personal best 11.45 @ 120 mph N/A car...9.11 @152 mph for the turbo car.


1987 FC  355 SBC, T-5, T2 rear        retired 5-4-11
1991 FC  383 SBC, sold to Dad. Now 5.3 w 76mm turbo, G-force T-5, 8.8 Ronin rear 
1990 FC  370 CID 6.0 w 88mm turbo, Powerglide, Ronin 8.8 w 3.15 gears

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #12 on: March 30, 2012, 06:46:13 PM »
So far it looks like it will. Not sure once I get the turbo and piping in there. It's going to be tight for sure. 

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #13 on: July 03, 2012, 01:40:31 PM »
With the back-to-back 100+ degree days progress has been slow. I did manage to cut a BFH in the fender. I think this will be the turbos new home. Was hoping for more room in the fenders, but these mazdas are tiny everywhere. Packaging is going to be the biggest obstacle with this thing. Also brought the harness in the basement to start on it. Should have it finished soon. The AEM EMS unit arrived as well.

Iíll be running E85/E98. Still debating if I have enough room for an intercooler. If I go A/A up front Iím having a hard time finding a core that can flow 800hp worth of air in the limited to a 26x12Ē space. I suppose I could just deal with the horrible pressure drop across the core. Probably better than no IC at all.  Been looking into W/A units too, but the only place I have room to mount it is in front of the radiator.  I donít want to block the airflow since I feel Iím already in a bind with only enough room for an 21x20 radiator. So Iím torn.  I really donít think Iíll need the efficiency of a W/A unit w/ e85.  Not to mention the added hassle of water tanks pumps and lines. Anyone know of a smallish IC that flows 1200cfm or so? I wonít need to take a ton of heat out of the charge with the E-85. I can always add some water/meth injection down the road too.









     

Offline forcefed86

Re: 1979 SA RX-7 LS Turbo Build
« Reply #14 on: August 11, 2012, 09:56:58 PM »
Temps here in KS finally dipped below the 100's.

The quick and dirty hotside is pretty much done. Still need to mount WG and I'm waiting on some 4" piping for the DP. I know the "T" style merge isn't the best way to go. It's actually not a direct 90* bend but it's close.  I'll have the WG on the opposite side of the "T". Should work well enough for my goals.   







Wiring harness is done. AEM EMS is here and waiting. Radiator is mocked up and test fit. May need a larger unit. I'm still trying to run a FMIC so I'm strapped for space with my turbo placement. The down pipe will barely fit with teh current radiator.  This ones core is 17x17x4.5" 3 core. It's an odd ball unit I picked up for $80 hoping it would work. If my math is correct on this radiator sizing chart it should work. Using the Taurus "super" fan as well so that should help.