SC400 Talk, 1UZFE HP Facts
10-22-05, 12:26 AM
#1
SC400 Talk, 1UZFE HP Facts
After some recent post about Nitrious on the SC400. Exhaust Changes, Intake Mods, TC's, ECUs, Headers and and other HP performance Mods lets try to set some things straight about what is available, what works and what is Unknown.
If you have some facts about what works and potential HP increase, Post it for discusson and others to see.
Keep in mind that there are 3 different engines produced with slight Variation and Lexus HP Crank ratings.
1. 92-95 250HP Lexus rating. 2. 96-97 260HP Lexus rating.
3. 98-2000 290HP Lexus Rating.
If you have some facts about what works and potential HP increase, Post it for discusson and others to see.
Keep in mind that there are 3 different engines produced with slight Variation and Lexus HP Crank ratings.
1. 92-95 250HP Lexus rating. 2. 96-97 260HP Lexus rating.
3. 98-2000 290HP Lexus Rating.
Last edited by jgscott; 10-22-05 at 12:35 AM.
10-22-05, 12:45 AM
#2
I saw a few recent post that said no ECU for SC400 works or cann be gotten for the SC400. A 40 HP gain --- > http://www.dynoperformance.com/artic...ails.php?ID=10 I have one on my car ! 
Last edited by jgscott; 10-22-05 at 01:00 AM.
10-22-05, 01:28 AM
#3
1993 SC400
Before (stock): 15.6-15.8 @ 89 mph on a 65 degree night
https://www.clublexus.com/forums/drag-strip/57271-1-4-mile-timeslips-big-pic.html
After headers, PI TC, exhaust, and minus spare: 15.0 @ 91 mph on a 94 degree day and spinning off the line.
Post #21
https://www.clublexus.com/forums/sho...t=89478&page=2
(Sorry for no pic of time slip. I was too lazy to scan it.)
Before (stock): 15.6-15.8 @ 89 mph on a 65 degree night
https://www.clublexus.com/forums/drag-strip/57271-1-4-mile-timeslips-big-pic.html
After headers, PI TC, exhaust, and minus spare: 15.0 @ 91 mph on a 94 degree day and spinning off the line.
Post #21
https://www.clublexus.com/forums/sho...t=89478&page=2
(Sorry for no pic of time slip. I was too lazy to scan it.)
Last edited by verylost; 10-22-05 at 03:30 AM.
10-22-05, 03:26 AM
#5
Originally Posted by jgscott
What year SC4 ?
And after all this time, I never realized that amount of gain I had in trap speeds. Thanks for the reminder.
10-22-05, 02:26 PM
#6
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I know the 1UZFE can get 500RHWP with some extensive mods and without forced induction because that is the engine JGTC uses now in their supras and caps it off at 500 RWHP.
Maybe I'll start doing some research..
Maybe I'll start doing some research..
10-22-05, 02:55 PM
#7
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I don't know much about JGTC but aren't those engines modified well beyond street use? Yeah they get 500hp out but those things are probably built with factory-only parts, race gas, etc. I'd love to see a 1UZ make power like that, and the 4.9 stroker and ITBs I've seen are cool, but unless I've missed something there's still a lot to be done.
James
James
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10-22-05, 08:02 PM
#8
JG post your dyno info too 
1992 SC400, 180,000 kilometers
K&N drop in filter, cut open front of stock intake
NGK BKR7E spark plugs
Walbro GSS341
94 Octane
171.6 rwhp on a dyno dynamics a/f 10.5:1
With Nitrous Express Wet kit, 150HP shot
Botle pressure just 600psi but was filled the day before.
267.6 rwhp a/f 10.0:1 (As rich as it will read!)
As you can see I am very rich. I am installing a bottle warmer and SAFCII and I am going back to the dyno for tuning in the near future.
1992 SC400, 180,000 kilometers
K&N drop in filter, cut open front of stock intake
NGK BKR7E spark plugs
Walbro GSS341
94 Octane
171.6 rwhp on a dyno dynamics a/f 10.5:1
With Nitrous Express Wet kit, 150HP shot
Botle pressure just 600psi but was filled the day before.
267.6 rwhp a/f 10.0:1 (As rich as it will read!)
As you can see I am very rich. I am installing a bottle warmer and SAFCII and I am going back to the dyno for tuning in the near future.
10-22-05, 11:30 PM
#9
Originally Posted by TurboTeg
JG post your dyno info too
1992 SC400, 180,000 kilometers
K&N drop in filter, cut open front of stock intake
NGK BKR7E spark plugs
Walbro GSS341
94 Octane
171.6 rwhp on a dyno dynamics a/f 10.5:1
With Nitrous Express Wet kit, 150HP shot
Botle pressure just 600psi but was filled the day before.
267.6 rwhp a/f 10.0:1 (As rich as it will read!)
As you can see I am very rich. I am installing a bottle warmer and SAFCII and I am going back to the dyno for tuning in the near future.
1992 SC400, 180,000 kilometers
K&N drop in filter, cut open front of stock intake
NGK BKR7E spark plugs
Walbro GSS341
94 Octane
171.6 rwhp on a dyno dynamics a/f 10.5:1
With Nitrous Express Wet kit, 150HP shot
Botle pressure just 600psi but was filled the day before.
267.6 rwhp a/f 10.0:1 (As rich as it will read!)
As you can see I am very rich. I am installing a bottle warmer and SAFCII and I am going back to the dyno for tuning in the near future.
Without Nitrious, I am working on using the bullet style 99 + SC4 Air Flow meter, New custom intake, Enlarged bored out throttle body, ported intake Manifold, Ported head and reworked Combution Chamber, JB Brady headers, Full Custom Resonate chamber Dual exhaust, no cats, Managed by the Unchip.
Anybody want to guess what its going to make on the Dyno Jet Dyno w/o Nitrous ?
Last edited by jgscott; 10-23-05 at 12:00 AM.
10-22-05, 11:51 PM
#10
Originally Posted by Idrewfelix
I know the 1UZFE can get 500RHWP with some extensive mods and without forced induction because that is the engine JGTC uses now in their supras and caps it off at 500 RWHP.
Maybe I'll start doing some research..
Maybe I'll start doing some research..
. For example the Ecotec motor found in the Chevy Cavaliers are nothing special and are inferior to other Japanese motors for street use. However, in pro-class they dominate most other turbod drag cars.
10-23-05, 12:04 AM
#11
Originally Posted by xknowonex
Yea race team only stuff are always crazy. Only if they would make race only stuff available to the public . For example the Ecotec motor found in the Chevy Cavaliers are nothing special and are inferior to other Japanese motors for street use. However, in pro-class they dominate most other turbod drag cars.
. For example the Ecotec motor found in the Chevy Cavaliers are nothing special and are inferior to other Japanese motors for street use. However, in pro-class they dominate most other turbod drag cars.
10-23-05, 12:54 AM
#13
Originally Posted by jgscott
With a big Bore and stroke, Cams, Pro head work, and valve train changes I think that motor could spin 8000RPM'sand make 500RWHP on pump gas with no problem.
It would make some real gains..and cost you a small fortune...
Ryan
10-23-05, 09:35 AM
#15
Lexus Champion
Originally Posted by jgscott
After some recent post about Nitrious on the SC400. Exhaust Changes, Intake Mods, TC's, ECUs, Headers and and other HP performance Mods lets try to set some things straight about what is available, what works and what is Unknown.
If you have some facts about what works and potential HP increase, Post it for discusson and others to see.
Keep in mind that there are 3 different engines produced with slight Variation and Lexus HP Crank ratings.
1. 92-95 250HP Lexus rating. 2. 96-97 260HP Lexus rating.
3. 98-2000 290HP Lexus Rating.
If you have some facts about what works and potential HP increase, Post it for discusson and others to see.
Keep in mind that there are 3 different engines produced with slight Variation and Lexus HP Crank ratings.
1. 92-95 250HP Lexus rating. 2. 96-97 260HP Lexus rating.
3. 98-2000 290HP Lexus Rating.
The first gen SC400 and the GS400 probably have the most dyno info for comparison. The typical GS400 makes 235rwhp/245rwtq. Doing the math (300-235=65, 65/300=0.216) gives us a reasonable 22% (21.666) drivetrain loss.
So, if the first gen made 250hp it should make 195rwhp. We all know it doesn't. 175rwhp is more like it. Working backwards gives us 224hp. I use 230hp as my rule of thumb.
The 96-97 models are rated 260hp so subtracting 22% = 203rwhp. I believe the 96-97 models typically dyno right around 200rwhp. This is both accurate and reasonable when you consider the performance difference between the 1990-1994 LS400s and the 1995-1997 LS400s as well as the difference between the 1992-1995 SC400s and the 1996-1997s. There is obviously WAY MORE than 10hp between these models.
Last edited by JBrady; 10-23-05 at 10:25 AM.