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Thread: The snowball of a build: 90 LSx Turbo Rx7

  1. #1
    Senior Member Phish's Avatar
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    The snowball of a build: 90 LSx Turbo Rx7

    I figured its about time to post some progress and changes that i have made over the winter. The Shell was bought last spring/summer. The car is a 1990 Mazda RX7 GTU. It had the locked up motor and had very low original miles. The interior and exterior of the car was in near perfect condition besides the door dings. All in all it was a great find. Here is the car as it was purchased:



    Once home in the garage, i swapped in the drive line from my precious project car (86 LSx Swapped RX7). The driveline included the Ford 8.8 IRS with 3.73 gears, Drive Shaft Shop Axles, TH350, and the turbo two brakes and hubs.








    Once the driveline was in the new car, I think pulled the old rotary out and installed the LQ4. At this time It was a stock bottom end LQ4 with a Comp Cams 232/234 .595 .598 cam. On top was a Ls1 intake (eventually a FAST 76) and ported and milled 862 heads. It was also spraying a 150 shot when feeling frisky. For fuel an AEM 320 LPH pump was installed along with Ford green top 42# injectors and Holley fuel rails to run E85.








    This setup did well and i dont really have any complaints. But like all car guys i decide i wanted more. I figured a topend swap and some headers would get me a bit more power and i wiould be pleased. I purchased a set of new LS3 heads and intake along with a 90mm throttle body.





    After installing the new topend i decided to clean up the engine bay a bit and did a wire tuck for the factory mazda harness along with moving the under hood fuse box. Also a catch can was installed.



    Now all of this was exciting, but someowhere along the lines i decided i was not spending nearly enough money. So, this is when i decided to go turbo. I began to figure out all the details on how i would route all of the piping and where things would be mounted. I had to change up the radiator to move the outlets to the passanger side of the car. However with a new radiator the new fans did not fit it right. So, this lead me to have to build a new fan shroud to use with the ford fans.





    After finishing up the fan situation i ordered some turbo parts and started building up the hot side for the turbo kit. I used a truck manifold on the drivers side and a Fbody manifold on the passenger side. This would put them int he right locations and get them heading the correct direction for the piping i was going to create. The piping is 2.5" off each v-banded manifold joining at the passenger side and going up to the turbo. The wastegate (Precision 46mm) is mounted just after the piping merges into one and is planned to route back into the downpipe.







    Everything fit quite snug int he bay. One of my main goals is not have to cut out any support or make any major changes to the structure of the vehicle. Thus i chose my turbo placement. The turbo that i chose was a journal bearing Comp Turbos CT43 8079 with a 3.5" DP and a 1.15 A/r. I was very impressed with the quality of the turbo once it arrived and it should reach my goal nicely.

    Once the turbo was bolted on to the new hotside, the DP was started to be fabricated. This is still a work in progress. The WG still needs to be routed into the DP. Again a tight fit but i believe it will still be a clean look when complete



    Now the cold side has also been mocked up and put into place. I am running a Ebay intercooler that most of the LS guys are running. however its a smaller 27" core. its 3" piping off the turbo and after the intercooler it transitions to 3.5" piping into the intake. Ignore the black section of pipe in the pics. I am waiting on a 3.5" aluminum straight section and just used something i had around for mock up. The 50mm RPS BOV will be welded into this straight section when it arrives.

    Here are some pics of the cold side and some other random pics to show where i am at currently with the build. i am sure there will be more info and pics to come and i am sure there is a ton of info i have left out.








  2. #2
    Senior Member Phish's Avatar
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  3. #3
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    nice!
    Rob Palmer
    Rest in Peace buddy...

    "I wish I could buy stuff for my car, but there's nothing else to buy...except a steering wheel." Ryan

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    Owner AutoMods's Avatar
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    thanks for sharing. looks clean. i like the wire tuck.

    I'm curious as to how good the pte46mm wastegate will control boost for you. I have the tial 44mm and its always controlled boost well down to 5psi until I went from my 5.7 to the 6.0 and at the same time got a larger turbine wheel/less back pressure. After i went from the 68mm turbine wheel to the 75mm, my boost didn't want to say below 14psi anymore. not a big deal since 14psi is minimum is fine for me. I'm venting to the atmosphere.

    my wastegate angle isn't the best but its not terrible

    Last edited by AutoMods; 01-12-2014 at 02:19 PM.

  5. #5
    Senior Member Phish's Avatar
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    yeah i am a little concerned about being able to keep the boost down. I believe my placement is a little better then yorus though but not by much. I only say that because mine will pick up most of the exhaust from the drivers side with how the piping is bent and flows. Its hard to see how all the sections bend and join together from the pics i have. I say i am giong to run 15lbs, however i think thats the limit of the stock bottom end. I know the bottom will eventually give out, just not sure when. I believe Andy is running 15-16 lbs in his stock bottom camaro. In a perfect world i would like to have it tuned to 15lbs and turn it back to 10lbs. Dunno if the WG will let that happen. If i cant hold it at 15, i guess i can always add a second gate - that would definitely be my last resort though.

  6. #6
    Owner AutoMods's Avatar
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    you have this routed well. smoother then i envisioned when i was looking at on my car. i think the narrower fmic helps.


  7. #7
    Owner AutoMods's Avatar
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    Quote Originally Posted by Phish View Post
    yeah i am a little concerned about being able to keep the boost down. I believe my placement is a little better then yorus though but not by much. I only say that because mine will pick up most of the exhaust from the drivers side with how the piping is bent and flows. Its hard to see how all the sections bend and join together from the pics i have. I say i am giong to run 15lbs, however i think thats the limit of the stock bottom end. I know the bottom will eventually give out, just not sure when. I believe Andy is running 15-16 lbs in his stock bottom camaro. In a perfect world i would like to have it tuned to 15lbs and turn it back to 10lbs. Dunno if the WG will let that happen. If i cant hold it at 15, i guess i can always add a second gate - that would definitely be my last resort though.
    you could add a 2nd gate on the drivers side easily but you'd have to dump that to the atmosphere. maybe you could set the drivers side wastegate to open a couple psi later and that way you would have a quieter system until boost creep occurs.

    but i wouldn't worry about it until later, your setup might not creep

  8. #8
    Senior Member Phish's Avatar
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    When i was first planning the kit, i was worried that the piping would be alot worse as well. However when i got making the kit, i realized it was going to be alot more clean and its actually just one 90 elbow from the turbo to the intercooler. I was really pleased to figure that one out.

    As far as the wastegate goes - I am planning on seeing how this works and what it does. Hopefully i can hold it to where i want it with the current setup. I am unsure with the turbo being the size that it is.

    I did get the piping mocked up to the WG back into the DP. I planned on doing a flex connector, however there was not room to fit it.


  9. #9
    Senior Member c_mart_28's Avatar
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    Better just renesis swap it..
    Casey
    '03 Mustang

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    2011 IAF/DS Rob Palmer Shootout Quickest Overall Competitor! (Just Barely..)

  10. #10
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    nice build!
    Johnathan

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