Lexus V8 Dyno Results

Engines and Engine Systems
User avatar
Alex Roux
Patrolman 1000+
Patrolman 1000+
Posts: 2420
Joined: 11 Jul 2011 10:54
Full Name: Alexander Roux
Nickname: Witblits
Home Town: Johannesburg
Current 4x4: 2004 GU 3TDi (Lexus) - aka "Witblits"
1996: GQ TB48 conversion - aka "Skilpad"
1993: GQ SWB TB42 - aka "Shortie"
Home Language: Afrikaans
Has thanked: 38 times
Been thanked: 111 times

Lexus V8 Dyno Results

Post by Alex Roux » 14 Sep 2016 09:55

I have had some concerns over the power and torque of my car for a while.
But had to sort out the petrol pump in the main tank first before doing the dyno tuning.

Secondly, the Lexus is argued by many to be sub-optimal for most 44 applications.
But whatever you believe an engine should ideally be able to do in terms of torque and power, and at a given engine rev level, the figures below is what matter.

Note, that I use the original ZD30 airfilter, which is not ideal for a big breathing engine.

Power summary:
Power from the flywheel:

IF (a big word), the air filter is disconnected, and having adjusted for altitude (pretending we are at sea level), then the power reached at 5,000 revs, is 190Kw (232HP) - off the fly wheel - which is what the engine is spec'ed to do.

Power from the wheels:
The impact off the air filter is about 16kw (reading off the flywheel is thus down to 174KW). But the airfilter only seems to have an effect at revs above 4000, so for most applications this is not a concern, in itself.
Measuring the power off the 33" tyres the reading is way down to 116 KW (about 155HP)/b]

Torque Summary:
Torque from the flywheel:

This is the interesting part, the torque from the beginning (seen on the chart from 1000 revs) is 373 NM (off the fly wheel) and remains at exactly that level and only starts to creep down after 4400 revs.
As with the power, the level of 373 NM is apparently what the engine is spec'ed to do.

Torque from the wheels:
Without the air filter, it the torque level of 373 NM starts creeping downwards at 50000 revs, but again, the application at that rev level is only of use on dunes.
Measuring the torque off the 33" tyres the reading is way down to 250NM.

So in summary, it is not as great as I had hoped it would be.
But an important thing I learned is that that there is not such thing as "poor low down" torque in this engine. As least not relative to the high end torque. It is all the same at all rev ranges at 373 NM (measured from the flywheel) and 250 NM (measured from 33" tyres).


Attached are the figures, comments are welcome.

[attachment=0]Dyno Results 2016-09-12.jpg[/attachment]
Attachments
Dyno Results 2016-09-12.jpg
Dyno Results 2016-09-12.jpg (378.86 KiB) Viewed 525 times
Skilpad, Shortie & Witblits (in no particular order)

User avatar
jonathan
Senior Member
Senior Member
Posts: 239
Joined: 20 Aug 2012 16:24
Full Name: Jonathan Venter
Nickname: jonathan
Home Town: Jacobsbaai
Current 4x4: 2005 4.8 GRX
Home Language: Afrikaans
Has thanked: 3 times
Been thanked: 19 times

Re: Lexus V8 Dyno Results

Post by jonathan » 14 Sep 2016 10:03

That's very interesting Alex. I can't remember, but do you have the non-vvti Lexus motor?

If so, what is encouraging is that after so many years it still produces the power and torque it was meant to!

User avatar
Alex Roux
Patrolman 1000+
Patrolman 1000+
Posts: 2420
Joined: 11 Jul 2011 10:54
Full Name: Alexander Roux
Nickname: Witblits
Home Town: Johannesburg
Current 4x4: 2004 GU 3TDi (Lexus) - aka "Witblits"
1996: GQ TB48 conversion - aka "Skilpad"
1993: GQ SWB TB42 - aka "Shortie"
Home Language: Afrikaans
Has thanked: 38 times
Been thanked: 111 times

Re: Lexus V8 Dyno Results

Post by Alex Roux » 14 Sep 2016 10:58

jonathan wrote:That's very interesting Alex. I can't remember, but do you have the non-vvti Lexus motor?

If so, what is encouraging is that after so many years it still produces the power and torque it was meant to!
Yrs, this is the old 1UZ, pre VVTi
Skilpad, Shortie & Witblits (in no particular order)

User avatar
Tinus lotz
Moderator
Posts: 6617
Joined: 29 Aug 2010 13:07
Full Name: Tinus lotz
Nickname: Tinus lotz
Home Town: Centurion
Current 4x4: Nissan patrol 4.8 GRX 2005

Toyota 2.7 legend 35 LWB 4X4
Home Language: Afrikaans
Has thanked: 505 times
Been thanked: 240 times

Re: Lexus V8 Dyno Results

Post by Tinus lotz » 14 Sep 2016 11:28

Mooi dude met daai figures hoef jy glad nie die lepel te trap nie hy moet al die goed kan doen regwyl hy idle :salute:

User avatar
Tinus lotz
Moderator
Posts: 6617
Joined: 29 Aug 2010 13:07
Full Name: Tinus lotz
Nickname: Tinus lotz
Home Town: Centurion
Current 4x4: Nissan patrol 4.8 GRX 2005

Toyota 2.7 legend 35 LWB 4X4
Home Language: Afrikaans
Has thanked: 505 times
Been thanked: 240 times

Re: Lexus V8 Dyno Results

Post by Tinus lotz » 14 Sep 2016 11:31

Wat het hulle verander?

User avatar
Alex Roux
Patrolman 1000+
Patrolman 1000+
Posts: 2420
Joined: 11 Jul 2011 10:54
Full Name: Alexander Roux
Nickname: Witblits
Home Town: Johannesburg
Current 4x4: 2004 GU 3TDi (Lexus) - aka "Witblits"
1996: GQ TB48 conversion - aka "Skilpad"
1993: GQ SWB TB42 - aka "Shortie"
Home Language: Afrikaans
Has thanked: 38 times
Been thanked: 111 times

Re: Lexus V8 Dyno Results

Post by Alex Roux » 14 Sep 2016 12:07

Tinus lotz wrote:Wat het hulle verander?
Ek moes seker maak na ek die pomp in die tenk vvervang het, dat die enjin nog reg is, want die goed is so fyn ingestel.
Dit was alles min of meer reg.
Maar die kar was tog traag wanneer ek wegtrek van doodstil staan af. Dit was blykbaar weens die TPS pomp wat nie gewerk het op die enjin nie (ek dink dit is die throttle position sensor).
Op die ECU settings kan mens hom disaktiveer dat die ECU eerder die werk doen van die TPS.
Nou is hy baie lewindiger van wegtrek af.
So sy hantering in die verkeer is baie meer bevredigend.
Skilpad, Shortie & Witblits (in no particular order)

User avatar
Michael
Moderator
Posts: 2453
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 140 times
Been thanked: 227 times

Re: Lexus V8 Dyno Results

Post by Michael » 14 Sep 2016 12:44

Alex, those are very good numbers and they should be more than enough.

I have never seen a petrol engine developing such high torque from 1,000 rpm and staying flat all the way. That means you should be able to idle up anything without effort.

Interesting how 33% of the power and torque is lost between the engine and the 33" tyres. :surprised:
Would love to see the loss with 31" and 32" as well to see the difference.
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

User avatar
David M
Patrolman
Patrolman
Posts: 760
Joined: 12 Nov 2013 15:13
Full Name: David Marais
Nickname: David Marais
Home Town: Midrand
Current 4x4: 1998 4.5 GL Patrol
2006 4.2 Td Bakkie (SWAMBO's) - The "Firetruck"
Home Language: English
Location: Midrand
Has thanked: 17 times
Been thanked: 71 times

Re: Lexus V8 Dyno Results

Post by David M » 14 Sep 2016 13:09

That torque curve is not a curve so it is brilliant.

Maybe we should start looking at putting 195 X 70 X 16 on our lorries.... :rolling:
There are still places out there!!!! - Daniel Goz - The "Tapam" movie

IanT
Patrolman 1000+
Patrolman 1000+
Posts: 1169
Joined: 17 May 2013 10:43
Full Name: Ian Temperley
Nickname: IanT (aka) "The Joker"
Home Town: JHB
Current 4x4: 2001 4.5 Grx (Mean Green)
2003 4.2 TDI (Ubhejane)
Home Language: English
Been thanked: 50 times

Re: Lexus V8 Dyno Results

Post by IanT » 14 Sep 2016 13:32

ViVa Petrol Power Viva :thumbup: :blonde:

User avatar
johanp
Senior Member
Senior Member
Posts: 117
Joined: 21 Jul 2010 10:07
Full Name: Johan Pheiffer
Nickname: Johan
Home Town: Pretoria
Current 4x4: 2004 Patrol 4800 GRX
Home Language: Afrikaans
Location: Pretoria
Has thanked: 1 time
Been thanked: 6 times

Re: Lexus V8 Dyno Results

Post by johanp » 14 Sep 2016 13:37

A V8 always sound good, but what does it sound like at 50000 revs? :rolling:

Post Reply

Return to “09. Engines”

Who is online

Users browsing this forum: No registered users and 1 guest