March 16, 2025, 06:30:00 AM

Author Topic: Whats the new hot engine combo for rx7  (Read 20877 times)

Offline Exidous

Re: Whats the new hot engine combo for rx7
« Reply #45 on: July 26, 2017, 05:53:52 PM »
My primary motivation was that I was finding full used LS7 rotating assemblies for ~$1000-1200. Leaving only the block. I have not looked in the last year or so and aftermarket may be the only option now.

A 416 doesn't allow you to have an RX-7.0 :-) I've also seen a few dyno results on the tech that seemed a bit underwhelming.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline atli126

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Re: Whats the new hot engine combo for rx7
« Reply #46 on: July 26, 2017, 07:03:29 PM »
A ls3 would be a dream and plenty for me

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-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline largeorangefont

Re: Whats the new hot engine combo for rx7
« Reply #47 on: July 26, 2017, 07:09:11 PM »
A ls3 would be a dream and plenty for me

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You can easily make LS3 level power with a lightly modded 5.3-6.0 Cathedral port setup.
Quote from: cool
Sell it to spacevomit.  He'll finish it.

Offline largeorangefont

Re: Whats the new hot engine combo for rx7
« Reply #48 on: July 26, 2017, 07:11:21 PM »
My primary motivation was that I was finding full used LS7 rotating assemblies for ~$1000-1200. Leaving only the block. I have not looked in the last year or so and aftermarket may be the only option now.

A 416 doesn't allow you to have an RX-7.0 :-) I've also seen a few dyno results on the tech that seemed a bit underwhelming.

A LS3 based 416 with any mild cam is going to make more power than a stock LS7.. period. I don't know what would be underwhelming. The LS7 is a great engine, but is not magical.

The stock LS3 with an ASA cam makes 525 HP. My 5.7 stockish LS1 will with stock heads and the same ASA cam is marking around 470 HP.
Quote from: cool
Sell it to spacevomit.  He'll finish it.

Offline ZDan

Re: Whats the new hot engine combo for rx7
« Reply #49 on: July 27, 2017, 07:42:59 AM »
A 416 doesn't allow you to have an RX-7.0 :-) I've also seen a few dyno results on the tech that seemed a bit underwhelming.
IMO "RX-6.9" is a modestly decent joke...  But I'm 6.8...
Anyway there's nothing magical about the 11 cubic inches between 416 and 427.  All else equal (same cam/heads/intake/exhaust/etc.), 427 will make 2.5% more torque in the low-end/midrange, and between 0% and 2.5% more power up top, depending.   If anything, swapping a 427 bottom end into setup that was "underwhelming" with 416 cubes will be even less impressive as far as hp/liter.
« Last Edit: July 27, 2017, 08:13:14 AM by ZDan »
'94 RX-7 / 6.8 LS3 / T56 Magnum
0-184.8 in 5280'  :)  (with the old 6.0...)

Offline atli126

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Re: Whats the new hot engine combo for rx7
« Reply #50 on: July 27, 2017, 08:13:02 AM »
A ls3 would be a dream and plenty for me

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You can easily make LS3 level power with a lightly modded 5.3-6.0 Cathedral port setup.
I found this. Pretty wild on a 5.3 or bored out to 6.0

http://www.trucktrend.com/how-to/engine/1208tr-5-3l-bow-tie-builds-mild-to-wild/

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I assume my 5.3 with the 225/225 cam, h/i/e  somewhere around 400 crank... My car dynod 330 at lsfest a few years ago
-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline kinger

Re: Whats the new hot engine combo for rx7
« Reply #51 on: October 31, 2019, 01:47:36 PM »
Wanted to bump a 2 year old thread just for fun!  To recap lots of 'destroking' talk to get higher revs, followed by lots of ITB set ups as a dream motor. 

So going into 2020 - Whats the new hot motor? 

I'm currently looking at 4.125+ bore motor with a 4" crank, and heads with a lot of flow at low valve lift numbers (<.300) to really maximize TQ in a NA application. 

Also loving the idea of a LSA blower on my current forged motor.  Sell the FAST and large TB and have $1K into it seems like a deal any gear head would love.  Used to hate the hood mod idea but now maybe I just leave it off and paint the ZR1 lid black LOL.   :scratch:

The car with NT01s bites so hard with my dainty 460WTQ my TC doesn't even kick in.  Feels like it needs more even though my face is melting as I surge to 100 in a blink of a gear change.  God these are fun cars! 
93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights

Offline largeorangefont

Re: Whats the new hot engine combo for rx7
« Reply #52 on: October 31, 2019, 01:55:41 PM »
I have a complete LSA blower minus the lid if you are interested.

But to be honest, more low end power is probably not what you really need unless you want to go widebody with bigger tires. Once you start spinning the NT01s you can go to drag radials, but those affect the handling of the car. From there you don't have a lot of choices as your traction control cripples the power of the car.

Much more than 500/500 to the tire these cars start becoming un-driveable and/or the compromises you have to make to drive them makes you not want to drive them.

Put a 50-100 shot on it and run it :)
« Last Edit: October 31, 2019, 02:02:20 PM by largeorangefont »
Quote from: cool
Sell it to spacevomit.  He'll finish it.

Offline gnx7

Re: Whats the new hot engine combo for rx7
« Reply #53 on: November 01, 2019, 10:53:46 AM »
The LSA blower and related parts will add around 100lbs to the front end.... they also heat soak very quickly and take a LONG time to cool off.... if you are going to do it... go turbo and you can have boost by gear/time and no heat soaking issues.

Resleeved alum 5.3 from Texas Speed to 4.155 bore or bigger (4.185) with a 4" stroke running the best heads you can afford would be a hot n/a motor.  Or just buy my 441ci setup with AllPro heads/intake and make 800hp n/a with a streetable road race cam.  https://ls1tech.com/forums/market/1915086

If you need crank/rods I sell Molnar parts and they are made from a better grade steel than Eagle, K1, Compstar, Lunati Voodoo cranks that are also forged overseas.  The Molnar parts are finish machined in the USA and Tom rates them at 1500hp and less.  My machinist has been VERY impressed with their quality and tolerances.
'93 FD: 441ci/AllPro LS7 heads/intake en route, T56 Mag, 8.8" IRS, HolleyHP, DavisTechTC 10.32@137mph cats/full exhaust. 165mph 1/2 mile (old LS7)
'93 FD LS9 turbo, T56 Mag, Samberg 8.8" solid axle, 9.35@163mph 197mph 1/2 mile
`69 Chevelle: alum 5.3, GTS76 turbo, ChiseledPerf A/W, T56 Magnum,Ford 35 spline 9".CTS-V interior http://www.norotors.com/index.php?topic=18234.0
old yellar....440rwhp/FD sold but not forgotten: http://www.ponycars.net/scc.htm
I sell new T56 Magnums/McLeod clutch/T56 rebuild kits/Holley EFI/FIC injectors and all BrianTooleyRacing parts.  norcalmotorsport@gmail.com

Offline SOB Racing

Re: Whats the new hot engine combo for rx7
« Reply #54 on: November 03, 2019, 08:41:19 PM »
No offence to anyone, but I'm sick of seeing LS swaps.   They are in everything these day.   Don't get me wrong, Solid tech, bullet proof and cheap cores.

I've been looking at the VW/Audi 07k 5 cylinders to replace the 4g63 Turbo in mine.   Put a big turbo on it and be different.

Just stating to stimulate conversation...8)
1987 RX7  4G63T Swap with 20G 11.50@122.7
1985 944 Pending a 4g63T Swap

1992 Eagle Talon TSI Retired
12.27 @ 111 on 14B
12.27 @ 113.9 on Small !6g
SOB Racing   "Sitting On Blocks"
2006 HHR "The Hearse" Lowered

Offline atli126

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Re: Whats the new hot engine combo for rx7
« Reply #55 on: November 03, 2019, 08:45:52 PM »
After selling my fc. I miss the hell out of my lsx setup now that I have my boosted miata.

Im thinking of buying a 15+ LS3 Camaro

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-Bret
87 RX7 5.3/t56 TII Check it out >>>>http://www.502streetscene.net/forum/showthread.php?t=181938&page=4

"no one ever said it would be cheap and easy, they just said it would be worth it"

"Whatever you do, don't lose your passion. Without it who are you?" -Me

Offline paul_3rdgen

Re: Whats the new hot engine combo for rx7
« Reply #56 on: November 04, 2019, 10:23:28 AM »
The K series honda motors seems to be interesting as well.  2.5L 4 cylinder turbo charged,  light weight, and packing enough horsepower to make it a fun track car.
93 RX7 R1 500rwhp
LS2, H/C combo... ARE drysump
Race Logic traction Control and 4 wheel Stoptech BBK
3.73 gears installed in the stock diff  :o

Offline digitalsolo

Re: Whats the new hot engine combo for rx7
« Reply #57 on: November 04, 2019, 10:38:24 AM »
I kinda wanna put a Honda K series in RWD form in a little Triumph or MG.   Something that weights 1600 lbs and has 300 RWHP would be a ton of fun.

For an RX7, I can't see anything better than an LS3 with nice heads right now.   Spin it 7500 RPM and put a Magnum behind it.   For a fun car, forced induction has no purpose unless you like dicking around with stuff.   And this is from a guy that turbocharges everything he owns.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline paul_3rdgen

Re: Whats the new hot engine combo for rx7
« Reply #58 on: November 04, 2019, 10:40:51 AM »
I’ve been looking into the option.  Lol.  K series making 600rwhp.... fast, light and turbo charged noises.  Lol.  Only issue is that your kind of pushing your luck, back to having a high strung motor that could fail. 


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93 RX7 R1 500rwhp
LS2, H/C combo... ARE drysump
Race Logic traction Control and 4 wheel Stoptech BBK
3.73 gears installed in the stock diff  :o

Offline cool

Re: Whats the new hot engine combo for rx7
« Reply #59 on: November 04, 2019, 12:34:34 PM »
After selling my fc. I miss the hell out of my lsx setup now that I have my boosted miata.

Im thinking of buying a 15+ LS3 Camaro

Sent from my moto x4 using Tapatalk

That is exactly what I did.  I picked up a 15' 1LE just over a year ago.