1uzfe experts can you confirm?

[drifty325i]

This is a pick of an ls400, it has the same cover my engine came with. Can anyone confirm this is the later 1995+ high compression 1uzfe? cheers


Riley

 

[cjsupra90]

There's no picture!

and I dont think that you will be able to tell just by looks

 

[drifty325i]

 

[mshawari1]

Yes !! But what you mean by "high compression" ??

 

[WDoherty]

it means the higher compression version of the 1uz which was introduced in the 95 ls400 and 96 sc400, the compression is bumped to 10.4 along with other minor changes. I have driven sc400's with both and there is a noticable difference, also the idle seems abit smoother on the later engine, at idle the exhuast note seemed to have no pulsation, just sounded like a solid tone. they dyno about 20rwhp more than the 90-94 version so that's about 25hp more at the crank.

 

[jibbby]

Is it just a slightly higher cam lift between the two motors... I would like to exactly how compression varies between the two motors and how the changes were made...

If anyone can quickly explain how they differ I would appreciate it....

 

[drifty325i]

Sweet thanks for the info, im stoked mines a high compression version. Im prob keeping mine N/A so it will be a good base

 

[drifty325i]

Here is some more pics i found, what you guys think?

 

[drifty325i]

Heres a picture of the ls400 its from.

 

[Anaema]

thats a very ugly engine cover.

 

[drifty325i]

thats a very ugly engine cover.

Thats why ive taken it off :006: All i care is its got more power lol

 

[WDoherty]

different pistons and rods homie! also slightly different cams as you mentioned, but that has no effect on compression. and the difference, 10:1 for the early motors, 10.4:1 for the 95-97 motors = 25 hp extra, that's as good as an entire header, exhaust system on an earlier motor, then you can still do it and gain even more.

Is it just a slightly higher cam lift between the two motors... I would like to exactly how compression varies between the two motors and how the changes were made...

If anyone can quickly explain how they differ I would appreciate it....

 

[jibbby]

WD 25hp is decent....The 98's came out with the VVt-i and that's a 45hp gain....That's as good as a cam upgrade:006:

Which would you rather have the 97 or 98 motor?

 

[drifty325i]

Im happy lol, 25hp is all good. We are just fitting up the tranny at the moment hehe

 

[WDoherty]

WD 25hp is decent....The 98's came out with the VVt-i and that's a 45hp gain....That's as good as a cam upgrade:006:

Which would you rather have the 97 or 98 motor?

i guess it depends on the final goals, but for a daily driver sc400, sure i'd rather have the 98up drivetrain.

 

[jibbby]

Yeah WD, the VVT-i motor is a bit more challenging to modify when trying to boost up.... I guess tuning the motor or something is the problem...

That is why I asked which motor would you rather own....