Supercharged 3800 Swap - Page 4 - RX8Club.com



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Old 10-21-2016, 12:17 PM   #76
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Quote:
Originally Posted by kickerfox View Post
There's quite a few things different about the Miata's sub vs. the 8. It may or may not bolt in the car (I hear it does) but the suspension is different. They are not directly interchangeable.

Not sure where you heard this info, I have an NC subframe in my 8 with 8 arms attached to it and everything Bolts in, the NC rack also fits perfectly Even all the little Brackets for the Abs lines and brake line bolt on to the NC subframe the same way as it did with the 8 Subframe.

Prescription8 I'm Sure there are alot more mustang ratios available than Miata So that would make sense esp if you want a faster ratio.

Not putting in a Miata 2.0 in my car, 2.3 disi

Not to thread jack, just in case there is any doubt lol
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Old 10-21-2016, 02:44 PM   #77
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miata parts

I actually have an nc subframe/steering rack in my car with the 8 arms and knuckles, it does work not sure where you got your info from kicker,

Priscription8 a faster rack would make it worth it for sure, not using a miata engine in my car but a mazdaspeed3 so far its been pretty much bolt in
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Old 10-21-2016, 06:18 PM   #78
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Well bolt in definitely speeds things along. I hear those are somewhat peppy motors too
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Old 10-22-2016, 10:21 PM   #79
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Quote:
Originally Posted by Bwek View Post
a faster rack would make it worth it for sure, not using a miata engine in my car but a mazdaspeed3 so far its been pretty much bolt in
What's the lock to lock on the NC?
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Old 10-23-2016, 03:20 PM   #80
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What's the lock to lock on the NC?
Ill have to check next time i get it up on the hoist.

Figure my post is useless without Pics

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Old 10-24-2016, 10:01 AM   #81
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Oh wow that frame looks a lot closer to the 8's frame than I thought, I must have found pics of the wrong year Miata or something when I googled it.
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Old 10-24-2016, 10:52 AM   #82
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Originally Posted by Prescription 8 View Post
Oh wow that frame looks a lot closer to the 8's frame than I thought, I must have found pics of the wrong year Miata or something when I googled it.

Yep its basically Identical except for the Steering rack mounts and the motor mounts
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Old 10-28-2016, 08:33 PM   #83
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Old 10-29-2016, 03:16 PM   #84
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It's amazing how much room there is behind the dash in the 8.

Cheers John
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Old 10-29-2016, 03:38 PM   #85
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Without the steering column in there it feels sooo spacious
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Old 10-29-2016, 04:44 PM   #86
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Was worried about how much my engine would require cut out the bulkhead, until I removed the dash & seen the space behind.

Cheers John
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Old 10-29-2016, 05:14 PM   #87
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Originally Posted by suicide-racer View Post
Was worried about how much my engine would require cut out the bulkhead, until I removed the dash & seen the space behind.

Cheers John
Don't forget about the wiper motor and linkage in the cowel
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Old 10-29-2016, 05:20 PM   #88
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I know. Engine is very close to it. Almost forgot all about it. Just going to clear it.

Cheers John
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Old 10-30-2016, 08:57 PM   #89
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Originally Posted by Prescription 8 View Post
Oh wow that frame looks a lot closer to the 8's frame than I thought, I must have found pics of the wrong year Miata or something when I googled it.
yep it bolts right in and the arms bolt right into the nc subframe.

Looks like you're making more progress than me, ive been hunting for a S2 rx8 trans to steal the tail shaft housing,

are you cutting your firewall? I just started cutting today made me shed a tear haha
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Old 03-07-2017, 11:51 PM   #90
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Got the steering shaft finished, added a u-joint and just tacked it in to check fitment, It's good so I'll need to do a final weld on it.
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So then I was able to get around to the test fit
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Got the trans super far back and found I still had room to push the engine further back
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It all seems to fit neatly in the bay, Pretty nice package. Still trying to decide how I want to handle the serp belt.

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Old 03-15-2017, 11:17 AM   #91
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i just love the fact that your swapping this 3800 into the rx8. i recently picked up a 99 buick park avenue ultra with a supercharged 3800 s2 engine. loving the power and the dependability of it.

keep it coming. looking forward to more update.
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Old 05-01-2017, 12:13 PM   #92
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I acquired the parts and dropped them off at a local machine shop to get my driveshaft jig made. While that was being done I began working on my exhaust manifolds.
To keep cost down I went to a local metal supply shop and got some hand rail tubing and elbows. Not ideal but the ID and price make it almost perfect for my build.
I also dropped the $40 on a harbor freight tubing notcher, Modified that according to a youtube video and got pretty decent results.
For my first try at fabbing a manifold I think it came out fairly decent.
Then Kicker stopped by and got it lined up even better than I had it.

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The bottom log is just set in place for the pic

I haven't decided if I want to mig it all or have someone tig it all for me. Either way I'm planning on getting the manifolds ceramic coated to help hood temps and thwart corrosion.


The driveshaft jig got made and I began drilling the holes at one end for the flange.
I can use this to line my trans up with the diff. This should put my engine exactly where it needs to be so I can get my engine mounts going and settle everything in place.

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Old 05-18-2017, 06:00 PM   #93
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ill say this again, i love the fact that you are doing this swap. i love the 3800 engine because its so versatile, compact, and has gobs of power when built up right.

this swap was honestly my next choice next to the 4.3l chevy engine when it comes down to overall fun and reliability. but, i am going with a 5.3l ls based engine this time around in my 8.
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Old 05-24-2017, 02:14 AM   #94
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Quote:
Originally Posted by No_Doritos View Post
ill say this again, i love the fact that you are doing this swap. i love the 3800 engine because its so versatile, compact, and has gobs of power when built up right.

this swap was honestly my next choice next to the 4.3l chevy engine when it comes down to overall fun and reliability. but, i am going with a 5.3l ls based engine this time around in my 8.
Thanks! I'm excited to get it done. Don't see many 3800 RWD setups that aren't Fiero's or Camaros heh



To update the thread:
Got a bracket made up with the help of kicker.
It'll hold the wilwood proportioning valve and a couple of mounts to clip a couple of custom hoses I had made to feed the block.
I later got the end changed with a 90 degree fitting.
I plan to make little 180 degree bends to go from the clipped in hoses to the block.


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Old 05-30-2017, 01:19 AM   #95
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Old 06-02-2017, 09:37 AM   #96
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Interesting engine choice. A local guy is selling one for a few hundred... Looks like it's coming along nicely!
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Old 06-04-2017, 12:05 PM   #97
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are you welding the injector holes shut? may i ask why if so? give us some dirt already. lol
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Old 06-04-2017, 03:31 PM   #98
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Interesting engine choice. A local guy is selling one for a few hundred... Looks like it's coming along nicely!
Yea these things are everywhere. If I blow this one up I should be able to find another fairly cheap heh


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Originally Posted by No_Doritos View Post
are you welding the injector holes shut? may i ask why if so? give us some dirt already. lol
Yessir.
The Supercharged 3800 has the injector holes in the heads. The N/A Camaro uses the manifolds for the injector holes, so thus I'll end up having 12 holes for 6 injectors, had to close up one set. If anything I can always drill and tap em for meth injection heh.
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Old 06-04-2017, 03:49 PM   #99
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Kicker welded up my injector holes, then went the extra step to smooth out the inside of the port.

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Went ahead with the cross member beneath the car to mount the trans and fab a ppf mount to hold the diff.

Started with round tube and some steel plates to make inserts for the frame rails.
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Did the same for the other side

also took some plated, drilled matching holes and welded on some nuts just to make assembly easier.
Got some square tube and cut it to length with a bit of an angle to match the frame rail angle.

Notched the square tube to fit around the brake/fuel lines and welded it up to the side plates. Bolts in place perfectly.

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Some 3/16 was added to cap off that notch so the tube was still closed off and strong.

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Old 06-05-2017, 01:51 AM   #100
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So not going supercharged? or just not with the factory Eaton?
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