1UZ-FE Lexus 4.0l V8 - Whats it really do ?

[TheToyman75]

Frank, (Nathan )

Mate the engine is apparently out of a Soarer or so the customer was advised anyway. Pinouts are not as per the SC400 tho

[JustCallMeOrlando]

Any idea of year?

[CrUZida]

I wasn't going to post in this thread, but hey, f*ck it, I will.

Rod, most people, including yourself, are used to seeing is the old UZS131 Crown and its restrictive headers pulling around 125rwkw. Mine pulled 132rwkw, GT's 125rwkw?, and I think Karls 128rwkw.
Most Soarer/Celsior motors with their superior headers pull 140rwkw, add a cat back exhaust and a BFI it will pull mid to high 140's. Yes, some Soarer motors pull less than 130rwkw, but I these motors would not be healthy. Either that or they are being run on standard fuel.

So the initial result is *maybe* 5rwkw higher than most dyno's but all in all quite close.


From what you have found it is very possible that the stock Soarer headers outflow the factory cams. Or flow a very similar amount to cams. This is quite a suprise to me.
It would be interesting to do another 1uz which has got full extractors, see what that can pull.

What I am not seeing on the dynograph there is the HUGE power surge at ~4500rpm.
You can just see it in the original graph, in both the power and torque curves. But its completely removed in the new curve.
Compare that to my graph where it stands out like dogs balls.
http://www.conceptual.net.au/~peewee/dynocomp2.jpg


And yes, we all know my twintake has done nothing for power on a stock motor. Its there for when cams are installed. But I can assure you both the response and sound with these puppies is awesome.

The other surprise is that I only have 5rwkw more, yet I have a manual gearbox and lighter driveline.
My intake temps were quite high (79degC according to DD), and my clutch was not the strongest, so its possible these were contributing factors.

It will be back at the dyno in probably late January. It has a new clutch and will be getting a revised intake system. I will post the results then.

[TheToyman75]

PeeWee,

Thanks heaps for the contribution. As I mentioned above I hadn't seen a 1UZ run up with the factory headers on before (As opposed ot the block huggers) so had no basis for comparison with the one we did here.

No idea on the difference in the shape of the curves mate ??

What is the go with your intake temp ??? Where the hell did they measure that ? An ambient temp of 24 degrees will have had an intake temp (as measuerd at the start of the intake tract) of a couple of degrees higher at most ?

The software compensates for atmospheric conditions, the higher the intake temp the more it compensates. I can only assume they had the sensor in the engine bay near the exhaust side to get such a high intake temp reading.

I can't wait to see how it goes with the new clutch and revised intake tho. Keep us all informed.

[JustCallMeOrlando]

Rod, if you saw his engine bay at the time, you'd understand

Pod filter just sitting in the bay, and a spaghetti array of extractors with no heatshield. You opened the bonnet, and, you know that feeling when you open an oven door?

[CrUZida]

Nathan pretty much had it there.
I couldn't be assed putting a proper airbox on it, so I just had a pod filter breathing the air directly behind the radiator.
Couple that with the poor floor of a dyno fan, and the engine bay warms up nicely.

The extractors usually glow on power runs.

[JustCallMeOrlando]

Haha, and of course the extractors aren't shielded because then you can't see them

[TheToyman75]

Thanks for clearing that up then Nathan A good cold air intake may well do the trick then.

The Hilux ran the factory cold air box with a K&N Panel Filter, slightly revised pipework to fit of course but was esentially standard.

[CrUZida]

Cold Air intake of some sort is on the agenda.
I have a pair of JZX81 airbox's to go in when I figure out how to do it.

HPC coating on the extractors is also planned at this stage. But at ~$500 I don't know if I want to do it just yet.

[TheToyman75]

A couple of Updates as promised.

We have had in another 2 1UZ-FE's for dyno tuning and intake mods this week.

The first was a Microtech controlled 1UZ-FE in a Toyota Hilux, Manual transmission, Cold Air Intake wityh K&N filter, sports exhaust and the factory block hugger headers.
158 rwkw. (No before run possible)

The second is a Factory Auto Toyota Soarer, Sports exhaust with aftermarket headers, Cold air intake and the Xede Processor. (Std air filter)
From 143 to 162 rwkw

[JustCallMeOrlando]

Far out, those block huggers really hurt the power!

[SL666]

really glad i went 1j now..

[CrUZida]

A couple of undates on mine.

Extractors HAVE been HPC coated, I decided to fork out the $$.

She went to a dyno day a few weeks back, I bumped the fuel trim up 5% because I was worried she was running lean, turned out she wasnt (11:1 @ WOT), but she turned 164rwkw that day.

She will be going in for retuning soonish (next month or so), will hopefully have a better result then, will be sure to bump this thread at that stage.



And yes, 160rwkw was my guess on the limit of the block huggers (stock everything else)

[TheToyman75]

Thanks for the Update CrUZida,

I'll be really curious to see the end result after the retune. All indications here seem to show a ball park 20rwkw gain which is massive for an N/A vehicle and great bang for your buck.

Where else with a N/A 1UZ can you gain 20 odd rwkw for a relatively small investment.

Once I get a graph for this soarer I will scan it in and post it up.

[joecoolmk2]

so are these piggybacks easy to setup?

how do the cheapo ones effect idle? is it worth getting more revs out of a 1UZ? will they make more power up top?

what speed is the limiter on the 1UZ? can these piggybacks remove limiter?