Soarer Central: Increasing Compression ratio?

Soarer Central Mechanical - V8 Increasing Compression ratio?

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Christian Somerville
TryHard
South Australia
UZZ31 V8 LTD

Posts: 216
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Tuesday, October 27, 2009 - 04:59 pm, by: Christian Somerville (Csomers)

The overall power will be increased, but the increase compression will put more stress on the engine components as seen in later model 1UZ-FE's.

Mike Beck
Goo Roo
New Zealand
4.0GT UZZ30

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Tuesday, October 27, 2009 - 08:38 pm, by: Mike Beck (Gold_40gt)

Christian Somerville wrote on Tuesday, October 27, 2009 - 04:59 pm:
but the increase compression will put more stress on the engine components as seen in later model 1UZ-FE's.

Of course, but keep in mind these early 1UZ's have stronger Rods and other internal components. The later ones when a bit weak due to the weight reduction they went through.

It's unbelievable how how far my mechanic pushed a stock 1UZ in his TT supra a few years back. Now though he has had to run larger head bolts, re drilling the in the block to keep the head on sealed tight they are using such a high compression coupled with the twin turbocharger setup. Recall its 14.0.1 with around 20PSI or so, quite insane, 400 and something rwkw. I forget exactly, must ask him when I pick up my head bolts later this week.

Damian Ware
Goo Roo
Victoria
UZZ32

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Tuesday, October 27, 2009 - 09:06 pm, by: Damian Ware (Frozenpod)

Christian Somerville wrote on Tuesday, October 27, 2009 - 04:59 pm:
The overall power will be increased, but the increase compression will put more stress on the engine components as seen in later model 1UZ-FE's.

Later model 1uz's are still fairly strong. There have been a couple that have survived supercharging dispite the thinner and lighter rods.

Early model 1uz's have been known to support 400rwkw so adding a small amount of boost with an M90 isn't really a big deal.

Damian Ware
Goo Roo
Victoria
UZZ32

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Tuesday, October 27, 2009 - 09:09 pm, by: Damian Ware (Frozenpod)

Mike Beck wrote on Tuesday, October 27, 2009 - 08:38 pm:
It's unbelievable how how far my mechanic pushed a stock 1UZ in his TT supra a few years back. Now though he has had to run larger head bolts, re drilling the in the block to keep the head on sealed tight they are using such a high compression coupled with the twin turbocharger setup. Recall its 14.0.1 with around 20PSI or so, quite insane, 400 and something rwkw. I forget exactly, must ask him when I pick up my head bolts later this week.

Mike has he machined the head down to up the comps or is it a built bottom end?

Justin's 1uz was putting down around 400rwkw 100% stock unopened motor including heads, factory cams ect. His best base line figures were 330rwkw at 10psi not in a soarer though and the lighter driveline has probably provided a higher dyno reading.

Mike Beck
Goo Roo
New Zealand
4.0GT UZZ30

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Tuesday, October 27, 2009 - 09:16 pm, by: Mike Beck (Gold_40gt)

Damian Ware wrote on Tuesday, October 27, 2009 - 09:06 pm:
There have been a couple that have survived supercharging dispite the thinner and lighter rods.

Your actually right. The TOM's Celsior with the 3UZ-FE has a TRD supercharger option, I would guess the internals are left stock.

http://www.tomsracing.co.jp/e/comp/f070/engine_p/compresser.htm

Wouldn't say no to a 260kw/559nm LS430/Celsior. Especially the one with the better lights... UCF30II type.. 2004-2005. Still holding their value for now.

What a nice kit by the looks of the small picture. Wouldn't be cheap!

Damian Ware wrote on Tuesday, October 27, 2009 - 09:09 pm:
Mike has he machined the head down to up the comps??

Yes quite a lot, not sure how much, but by the looks of a spare head he had a couple of thousands off, pretty much at the limit. Same with the head ports, they have bored them to the point there they need to be careful of breaching the coolant cavities.

It's an impressive machine, I must get some details and pictures of it sometime.

The turbo/header manifold is like modern art.