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Old 07-12-2009, 02:23 PM   #1
MXJS
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Default 1988 RX-7 powered by chevy

Hey everyone, I put my RX-7 on the dyno yesterday and here's what it did. A chev truck put down 220 before me so I was honestly expecting 230-240 horsepower. Needless to say i'm very pleased and hope to have track times soon.

2005 LQ4 6.0L vortec bone stock
LS1 intake manifold (flows worse than the truck manifold)
LS1 exhaust manifolds
LS1 ECU/wiring harness

Only power mods are dual exhaust and k&n short ram.

Timeslip added below in post 18!

For reference, a stock 505hp C6 Z06 did 447 at the wheels.



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Last edited by MXJS; 07-19-2009 at 03:56 PM.
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Old 07-12-2009, 03:52 PM   #2
C J
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ha, whoever told you an LS1 intake flows worse than the truck manifold is crazy
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Old 07-12-2009, 03:56 PM   #3
GeneralTJI
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Nice!
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Old 07-12-2009, 04:06 PM   #4
akeric
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good install and nice numbers, how well does the car drive? i'd imagine the weight difference between the factory rotary and the v8 is pretty significant, did you do much in the way of suspension mods? I bet thats a good fun 300 hp with a car that light.
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Old 07-12-2009, 04:13 PM   #5
Daz-E
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Quote:
Originally Posted by C J View Post
ha, whoever told you an LS1 intake flows worse than the truck manifold is crazy
Werd !!!
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Old 07-12-2009, 05:15 PM   #6
godforbid67
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Sweet. My buddy has a hemi in his truck and one day he wants to toss it into a rx7 or something.
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Old 07-12-2009, 05:49 PM   #7
V6TurboTA
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Wow that is so coo.... Wait a second do I see PINK under the hood? I take it all back.

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Old 07-13-2009, 12:30 AM   #8
MXJS
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Quote:
Originally Posted by C J View Post
ha, whoever told you an LS1 intake flows worse than the truck manifold is crazy
The LS1 intake does flow worse, but not by a huge margin. You can find flow numbers here:
http://www.performancetrucks.net/for...d.php?t=397720

Quote:
Originally Posted by akeric View Post
good install and nice numbers, how well does the car drive? i'd imagine the weight difference between the factory rotary and the v8 is pretty significant, did you do much in the way of suspension mods? I bet thats a good fun 300 hp with a car that light.
The car drives fine for what i'm doing. To be honest, its going to be my drag car. If i had done an aluminum block (ls1 or ls2), then the weight difference would be negligible with the a/c delete and battery relocation.
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Old 07-13-2009, 12:36 AM   #9
SVT_WRX
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Ahhhh yes....the FC with a v8 swap......the memories that brings back. Nice numbers and clean setup.

I had an FC back in the day. No V8, but I had an 88 Turbo II bridgeport 13B that was pretty damn fast. 297 WHP and 250WTQ fast. Back then (late 90's) it was a beast. I sure do miss that thing.

BTW, I saw your vids on youtube. Damn fast and sounds mean.
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Old 07-13-2009, 07:53 AM   #10
wrxhard
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Quote:
Originally Posted by MXJS View Post
If i had done an aluminum block (ls1 or ls2), then the weight difference would be negligible with the a/c delete and battery relocation.
So are you saying that you'd put the a/c back in and put the battery back up front if you had ls1/ls2? I doubt it. All i'm saying is that 90 lbs on the nose is NOT a negligible difference.

But i digress. Car looks awesome. Very nice power too. Congrats!!! I vote for a Master Power 4503 turbo!!!! IF there's room
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Old 07-13-2009, 08:12 AM   #11
Silver_04_WRX_SC
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Quote:
Originally Posted by wrxhard View Post
So are you saying that you'd put the a/c back in and put the battery back up front if you had ls1/ls2? I doubt it. All i'm saying is that 90 lbs on the nose is NOT a negligible difference.

But i digress. Car looks awesome. Very nice power too. Congrats!!! I vote for a Master Power 4503 turbo!!!! IF there's room
I think he was saying that if he had done a LS1/2 swap with the ac delete and battery relocation then there wouldn't be a huge difference between the 13B and LS1 swap....


Awesome build! Makes me miss my 88 10th anniversary....god I loved that car!
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Old 07-13-2009, 09:42 AM   #12
DC5edSTI
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Very cool build... I've always thought about this setup as a cool project car when I finally get a house!
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Old 07-13-2009, 11:13 AM   #13
GeneralTJI
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Whats it weight now??

Got a local guy here with a 3rd gen / LS1 swap with a 100 shot.. pretty quick ride because it's so light. Real, real quiet too and sports a fart can to top it off
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Old 07-13-2009, 11:41 AM   #14
MXJS
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I havent weighed it yet. I would like to get it to 2900 lbs or lighter w/o me in it, but i estimate 3000-3100 as it sits.
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Old 07-13-2009, 12:39 PM   #15
burtonboy759
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got a buddy who had a tII that put 323whp, that thing moved. Now a friend of mine is finishing up his 87 Rx-7 it will probably be close to 500whp when its all done. Those cars are beasts. I love the sound of the LS1 in a Mazda haha. sick setup!
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Old 07-13-2009, 01:23 PM   #16
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Quote:
Originally Posted by Silver_04_WRX_SC View Post
I think he was saying that if he had done a LS1/2 swap with the ac delete and battery relocation then there wouldn't be a huge difference between the 13B and LS1 swap....
Ya know, i never thought about it that way. Makes much more sense, especially from somebody with the skillset and knowledge to put together such a machine. My bad

What transmission was used on this bad mofo?
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Old 07-13-2009, 02:30 PM   #17
Masterauto
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Interesting transplant....Modern day Cobra style ride. Hope you can solve the heavy front bumper.
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Old 07-19-2009, 03:55 PM   #18
MXJS
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Well i took it to the track over the weekend and only got one good run in. I took it easy off the line to make sure not to break the diff yet.

I'm car #378


I was very pleased with the results. It's a good feeling to go in the 12's with a stock engine on 87 octane. I believe next time i will be able to launch it harder and run a 12.7 possibly.
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Old 07-19-2009, 04:36 PM   #19
LargeOrangeFont
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Nice work. I am looking at doing the same thing with my RX-7.

Swap looks clean from the pics. What mount kit did you use? Hinson or Granny's?
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Old 07-19-2009, 05:20 PM   #20
shadowmd
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nice work!
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Old 07-19-2009, 05:30 PM   #21
modaddict
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You need moAr turbo!
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Old 07-19-2009, 06:06 PM   #22
MXJS
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Quote:
Originally Posted by LargeOrangeFont View Post
Nice work. I am looking at doing the same thing with my RX-7.

Swap looks clean from the pics. What mount kit did you use? Hinson or Granny's?
I used granny's and it fit excellent. No complaints at all.

Quote:
Originally Posted by modaddict View Post
You need moAr turbo!
Tempting...
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Old 07-19-2009, 06:39 PM   #23
LargeOrangeFont
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Quote:
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I used granny's and it fit excellent. No complaints at all.


I have a Hinson kit in the garage.. thinking of switching before I do the swap.
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Old 07-19-2009, 06:52 PM   #24
ICE_COLD
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i have seen one just like this though it had a fully built ls1 in it.. i think it was to much it could never keep traction every gear turned it sideways lol
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