Lexus V8

[scottcmb]

Hy pplz, i need info on the lexus v8 engine, what is the best model engine to get, full specs, what is the max red line RPM it revs to, what are the heads like for flow in a stock form and who can give me good info as to turboing this engine to 650hp.....the reason i ask this is because next week i going to place an order for a particular Kit Car and these engines are perfectly suited to it!!!...i found this site and thought who better would know.....look forward to your replies......cheers Scott

[strx7]

if the kit car deserves some real cash spent in the engine bay, there aint no substitute for a 40V 4.2 Quattro V8, the power delivery of those engines is something others can only aspire to.

[nite b]

A well thought mild turbo setup on 1UZ will give you the HP you are looking for. If you get stuck, give us a buzz here:

http://1uzquadcam.co.nz

Good luck

[scottcmb]

if the kit car deserves some real cash spent in the engine bay, there aint no substitute for a 40V 4.2 Quattro V8, the power delivery of those engines is something others can only aspire to.

i think i will stick with the toyota thanks!

[scottcmb]

A well thought mild turbo setup on 1UZ will give you the HP you are looking for. If you get stuck, give us a buzz here:

http://1uzquadcam.co.nz

Good luck

thanks for that.....i will be in touch!

[scottcmb]

so what model engine should i source from the jap parts importers? and are these engines strong enough in the bottom end to handle 7500 rpm in a sustained manner?

[Dell'Orto]

If you can track one down, how about a 3UZ? Alloy block unlike the 2UZ, and still gives a few more cubes over the 1UZ.
Speedway guys routinely have 1UZ's at 9000rpm, so I dont see why 7500 would be any issue.

[Mr.Phreak]

The 1UZ (4.0L) is alloy, The 2UZ (4.7L) is iron, the 3UZ (4.3L) is alloy

The 1UZ will be cheap, the others won't

[MrDori]

i thought all the 1uz will make the some power 190kw, 250 odd hp,
Should be able to rev that much

[Dell'Orto]

The 1UZ (4.0L) is alloy, The 2UZ (4.7L) is iron, the 3UZ (4.3L) is alloy

The 1UZ will be cheap, the others won't

Saturday morning is dyslexia day here

[scottcmb]

ok so there is three motors to choose from, besides the cubic capacity which engine has better flowing heads, better watercooling characteristics and a better oil curcuit....and im not concerned with variable valve timing

[levinguy]

my understanding is, and i may be wrong, is that the 2uz and the 3uz are both very hard to find as well as expensive,

i know its not the bext example if you really want the engine, but look at trademe, always at least 5 1uz's for sale but i've never seen a 2uz or a 3uz on there

[big_boy]

3UZ has bigger water gallries & alot less head work is required but watch the middel ports on each head between each pot as there is only about 1.5mm wall thickness as i found out on my 1st head

you can also stroke a 3UZ with a 2UZ crank & JE pistons

i had written up fully on my motor iv just finished doing up but brad ( Mmm, Boost ) deleted it to ask questions first so maby ask him to see it because i cant be bothered writeing it again if its going to get deleted

[fivebob]

There are several versions of the 1UZ, later models are better designed and incorporate quite a few changes but are much harder to find. Not sure about any other versions but the Lexus LS400 underwent 1 minor revision in '92/93 (change to injectors/ injection system) and two major revisions;

'95 had changes to the heads, block, Increased compression, More duration o nthe inlet camchanges to the injection system, ECU, and MAF Sensor, this increased power from 186kw@5600rpm to 194kw@5300rpm and torque from 353Nm@4400rpm to 366Nm@4500rpm.

'98 had VVTi along with more changes to the head (upright intake port, taper squish, bigger valves, underbucket shims, more duration on the inlet cam(VVTi), steel head gasket, improved block and crankshaft rigidity, changes to the piston skirt, piston coated with friction modifier, ACIS, returnless fuel system, DIS direct ignition system, and increased thermostat size. Power 216kw@6000rpm, Torque 407Nm@4000rpm.

I have full documentation on all the differences between the LS400 versions of the 1UZ as well as the differences in the 3UZ, I'll load it up to my web server if anyone wants to see it.

[scottcmb]

There are several versions of the 1UZ, later models are better designed and incorporate quite a few changes but are much harder to find. Not sure about any other versions but the Lexus LS400 underwent 1 minor revision in '92/93 (change to injectors/ injection system) and two major revisions;

'95 had changes to the heads, block, Increased compression, More duration o nthe inlet camchanges to the injection system, ECU, and MAF Sensor, this increased power from 186kw@5600rpm to 194kw@5300rpm and torque from 353Nm@4400rpm to 366Nm@4500rpm.

'98 had VVTi along with more changes to the head (upright intake port, taper squish, bigger valves, underbucket shims, more duration on the inlet cam(VVTi), steel head gasket, improved block and crankshaft rigidity, changes to the piston skirt, piston coated with friction modifier, ACIS, returnless fuel system, DIS direct ignition system, and increased thermostat size. Power 216kw@6000rpm, Torque 407Nm@4000rpm.

I have full documentation on all the differences between the LS400 versions of the 1UZ as well as the differences in the 3UZ, I'll load it up to my web server if anyone wants to see it.

hmmmmm ok...sounds like the VVT 1UZ is the way for me to go........is there any particular markings or codes on the engine that i should look for when i go to buy one so i can tell its a genuine?

[Mr Revhead]

ok.....

putting back in what was mistakenly removed:

big_boy, your post was removed.
to see why, please see here:
http://forums.toyspeed.org.nz/viewtopic.php?t=56296



and a useful tech article on the uz family as hosted by fivebob (cheers!)

http://users.on.net/~fivebob/documents/1uzto3uz-history.pdf

[scottcmb]

ok i have just found a couple of 1UZ motors for sale. It mentions mid sump and forward sump engines and it states that the forward sump is higher in KW is this true?....if so what KW ratings are these two engines?.....and does the higher KW motor have different internals or is just a case of higher compression and different cams?....thanks Scott

[Mr.Phreak]

The VVT looks different, and is pretty easy to pick

The Mid sumps are usually out of Crowns and tend to be around the 89-90 range whereas the front sumps tend to be out of the Celsiors in the 91-94 range.

It may be a later model front sump engine, but it's probably more likely a wrecker has been talking out of his ass.