Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC 400/300 > Performance & Maintenance
Sign in using an external account
Register Forgot Password?


Thread Tools Search this Thread Display Modes
Old 07-05-14, 05:01 PM   #1
Trader Score: (0)
soarer1988's Avatar
Join Date: Feb 2014
Location: FL
Posts: 74
Default r154

how much hp can a stock r154 hold
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
soarer1988 is offline   Reply With Quote
Old 07-05-14, 07:44 PM   #2
Lexus Champion
Trader Score: (0)
Join Date: Oct 2006
Location: Vancouver, BC
Posts: 3,062

Depends. How much searching can you do?
scENFORCER - 1999 SC400

LSD / PPE / Tanabe / Carbing / BFI / Megan / TMS / Dazien / Volk
scENFORCER is online now   Reply With Quote
Old 07-05-14, 07:47 PM   #3
Lead Lap
Trader Score: (1)
Toyboxx's Avatar
Join Date: Jun 2008
Location: Az
Posts: 494


700-800ish. But it's not really HP that kills trannys, axles, or drive shafts. It's TQ.
Hanging out the coupe lettin ride sidewayz

'93 Lexus SC300 Megan EZ StreetsPolished TT Supra WheelsSoarer 1JZGTE R154 Swap SOLD

Current: 2008 Honda Civic Lowered & Stuff

Modifying is cars is more than just throwing on a bunch of random parts, it's a form of art, a vehicular sculpture
Toyboxx is offline   Reply With Quote
Old 07-05-14, 09:15 PM   #4
Lexus Test Driver
Trader Score: (3)
Join Date: Jan 2011
Location: NY
Posts: 958

Originally Posted by soarer1988 View Post
how much hp can a stock r154 hold
More than you can afford, pal.

No but seriously. It will handle just about anything. You'll end up ditching it because of rear seal issues and tractor shifts before it ever blows up.
Daytona Blue 350Z (VQ-35DERevup)
Imperial Blue Trailblazer SS (LS2)
Royal Jade Pearl SC300 (2JZ-GE+W58 --> 1JZ-GTE+R154)

CT12A twin turbo @23psi (gone)
TO4S 60-1 P-trim T4 .70A/R @ 21psi (gone)
BorgWarner S366 T4 .91A/R @26psi

AEMv2/BC272/SP-QSV/Kaaz SQ-LSD/LQ9coils/water-meth/4"single/S366/T51R compressor cover--- build in progress
INTIMAZY is offline   Reply With Quote
Old 07-06-14, 03:36 AM   #5
Trader Score: (3)
Join Date: Jun 2010
Location: California
Posts: 1,978

^^ lol

750whp is supposed to be the reliable ceiling assuming the internals are in good shape and it isn't power shifted or drop-clutch launched but the 1st gear thrust washer and front bearing retainer plate will need to be replaced (which means you might as well rebuild it and throw in MC parts) well before hitting that level of horsepower. It's funny that the maximum whp number is thrown around so much and not the torque number JZ's usually put out at that level.

I don't think it shifts like a tractor. It's definitely a chunky transmission but it's pretty smooth after initially warming up. Reverse takes some getting used to though.

Edit: The OP did say "stock R154". I think the number for a stock R154 I recall is somewhere around 500whp assuming the thrust washer and bearing retainer plate aren't too worn such that a rebuild would be needed.
1993 SC300 5-speed NA | Built R154 | Gixxer_Drew Susp. 600/325 | TT: brakes FR, rims, rear sway, seats | Koyo rad | 4.272 TT Torsen LSD

Last edited by KahnBB6; 07-06-14 at 03:43 AM..
KahnBB6 is offline   Reply With Quote
Old 07-06-14, 06:08 AM   #6
Lexus Fanatic
Trader Score: (6)
Join Date: Dec 2002
Location: So Florida baby
Posts: 6,686
Send a message via MSN to lexforlife

^^^^^ this ... im at 600 rwhp and on my second genuine soarer box .. it really comes down to how you drive it and what type of clutch and fluid you are using ..

red line mt 90 works wonders in this box .. if you are deep into the 550rwhp+ world and do not have mc internals and a solid twin or triple disk clutch , i would refrain from hard launches and definitely no power shifing /banging 2 to 3 rd gear as thats when you actually smash the thrust washer from the sudden load then break the 2-3 gear shifter fork .. then your box sounds like a box of marbles
NA-T 600rwhp @19psi on 93octane tuned by alpha at induction performance
lexforlife is offline   Reply With Quote
Old 07-06-14, 05:06 PM   #7
Trader Score: (3)
Join Date: Jun 2010
Location: California
Posts: 1,978

^^^ Yep :/

I also use Redline MT-90 transmission oil (you must use the non-LSD type MT-90 oil). I have all the MC parts available except for the new 5th/Reverse fork from Driftmotion which wasn't available when I rebuilt mine. Replacing all the forks with the billet pieces from MC and DM is recommended. Someone commented on another CL thread that the majority of the R154 is built like a tank but the factory 1st gear thrust washer, front bearing retainer and all shift forks are the under built pieces that can be overstressed. But all of those can be replaced now with better parts. And still... this is a much, much stronger transmission than a W58.

Twin and triple disc clutches are supposed to help with transmission wear and avoid crank walk from a heavy single disc pressure plate. I have no experience with them to comment on. I'm still using am OEM 7MGTE clutch and pressure plate on my car while I'm NA (very cheap interim clutch for NA use). My understanding is that upgrading the clutch disc to an ACT or Southbend while still using the factory 7MGTE pressure plate keeps the stresses out of dangerous territory. Of course, that's only good for maybe 400-450whp. Someone correct me if I'm wrong.

The other thing with R154's and V160's is that on original manual cars the neutral safety switch on the clutch pedal must be disconnected and jumpered. Always start with the transmission in neutral. Reason being that this helps to prevent crank walk due to oil starvation on the rear crank bearing upon startup. W58's and automatics don't cause this problem, and 7M engines with R154's don't have the issue, just 1JZ/2JZ's with R154/V160's. Supra MKIV guys will also disable their NSS with either manual transmission.
1993 SC300 5-speed NA | Built R154 | Gixxer_Drew Susp. 600/325 | TT: brakes FR, rims, rear sway, seats | Koyo rad | 4.272 TT Torsen LSD

Last edited by KahnBB6; 07-06-14 at 05:11 PM..
KahnBB6 is offline   Reply With Quote
Old 07-07-14, 10:51 AM   #8
gte & na-t
Trader Score: (44)
99SC42's Avatar
Join Date: Jan 2007
Location: Maryland /Germantown
Posts: 5,034

700tq all day on mine, depends on a lot of things.. But a low mile un molested on will do take just about 700wtq.
99SC42 is offline   Reply With Quote
Old 07-07-14, 10:51 AM

Similar Threads
Thread Thread Starter Forum Replies Last Post
TX wtb w58 or r154 wth98sc SC400 / 300 Classifieds 5 04-03-14 06:51 AM
any recommended shop to rebuild my r154??? phamxOC SC 400/300 2 03-25-14 12:12 PM
MN Wtb: R154 yell0w SC400 / 300 Classifieds 5 05-23-13 11:47 AM
CAN-Toronto WTB: R154 front shaft/bellhousing rcchris7 SC400 / 300 Classifieds 4 03-31-13 09:43 PM
MD WTB r154 transmission fonzo SC400 / 300 Classifieds 0 09-18-12 02:05 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 12:29 AM.

Join ClubLexus

Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS

Get all contact info