Soarer Central: Archive through March 19, 2007

Soarer Central Mechanical - TT Turbo Talk Turbo response Archive through March 19, 2007

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Shane Crichton
TryHard
NSW
Cressida Turbo

Posts: 126
Reg: 03-2006

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 09:23 am, by: Shane Crichton (1jz747)

400 rwhp at 18 psi is very optimistic with a 1j.hes going to need 22 psi or some gas

Chris Davey
Goo Roo
QLD
Corona

Posts: 1246
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 09:59 am, by: Chris Davey (Chris_davey)

I would think that an xr6T GT35 could go close to making 280rwkw @18psi. Not 300rwkw though without cams.

If Ben Burgess can make 270rwkw@19psi with the GT30 .8x a/r. A GT3540 with 1.06 a/r is going to flow more efficiently at that boost level (less backpressure between head and turbo). I think t04z is overkill also. 67mm turbo for 300rwkw doesn't really make sense to me.

You have to remember that if you are making the power level at a lower boost level then you will most likely be sacrificing boost threshold. Therefore, even though the peak power may be reached a car that makes less power but more power under the curve could actually be faster e.g. Say a t04z 1jz did make 300rwkw @18psi. As was said full boost would probably not be reached until close to 5000rpm. If another car was making 280rwkw with a GT30@21psi say. This car will be able to hit full boost by 4000rpm and make good power from then. Basically, 1000rpm advantage or so. In an example like this I can see the GT30 powered car out accelerating a t04z powered car for the majority of a race until close to the finish line. On the street the GT30 powered car would be a lot more drivable. If the t04z powered car was setup right with the correct stall that it could take advantage of the extra power earlier on in the race then it would win. However, in practice getting the converter right is quite difficult. Other option is nitrous which apparently makes it a hell of a lot easier.

As this is a street car, I would recommend the GT3076R if 280rwkw is really all that is wanted. If you want more than this then I would stick with a GT3582R .8x a/r.

question: does the amount of boost required actually matter that much? e.g. say both of the above cars were making 280rwkw and one used 18psi and the other 21psi. Which is harder on the engine? They must both be ingesting the same amount of air and burning it with the same amount of fuel to make the same power but would the less efficient 21psi GT30 be harder on engine internals? I don't think it would be but could someone comment on that?

Chris Davey
Goo Roo
QLD
Corona

Posts: 1247
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 10:00 am, by: Chris Davey (Chris_davey)

oh and relating to that.

2 cars both make 280rwkw. One uses 20psi and the other uses 15psi and a shot of nitrous. Any difference to engine internals?

Braden Murdoch
TryHard
NSW
Cressida 1JZ TT

Posts: 332
Reg: 04-2006

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 10:05 am, by: Braden Murdoch (Ribfeast)

I always wanted to make a digital readout on one of those 9 segment displays of what gear the auto is currently in. Just need something to decode the binary(?) code of the solenoids and send it to the display somehow.

Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 1422
Reg: 03-2006

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 10:18 am, by: Daniel Clarke (Dieseltrain)

Hehe soarers have it standard Braden. Any way you could work it out from the wiring to the Display on a TT dash?

Maybe purchase a cheap tt dash and remove just the gear selection bit.

I dont know, but ya gotta start some where!

Braden Murdoch
TryHard
NSW
Cressida 1JZ TT

Posts: 336
Reg: 04-2006

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 11:36 am, by: Braden Murdoch (Ribfeast)

I want it to say 1, 2, 3, 4 etc instead of D 2 1

Do the soarer dashes actually do that? Anyone have a photo?

Chris Davey
Goo Roo
QLD
Corona

Posts: 1248
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 12:21 pm, by: Chris Davey (Chris_davey)

fine, skip my question!

I have seen what you are talking about on a US supra.

Benjamin Burgess
Goo Roo
NSW
Toyota Soarer GT-TL, Toyota Corolla Conquest

Posts: 1137
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 04:54 pm, by: Benjamin Burgess (Jampac)

My engine is getting tuned again on tuesday hopefully. In hong kong at the moment so can't do much, except go shopping at the markets.

I'm aiming for 300rwkw this time around with the power fc, rebuilt gearbox and around 22psi of boost. If I can't make 300rkw, going to get some hks cams and go for it again. Should do it easy with cams. Anything over 270rwkw you gotta get the gearbox rebuilt for the power if its an auto. They just can't take it, and eventually just start slipping badly due to wearing out.

Shane McInnes
DieHard
NSW
JZZ30 GT-TL Manual

Posts: 926
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 06:18 pm, by: Shane McInnes (Soarin_tt)

Gotta give Toyota Credit though, Its amazing that the Auto Gearbox can handle 250 - 270rwkw with a shift kit. Thats alot of power. 100 to 130 more Rwkw than its expected to handle.

Aaron Mead
Goo Roo
NT
TT

Posts: 1357
Reg: 03-2006

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 08:01 pm, by: Aaron Mead (Aaron)

I was speaking to Ray Hall about t04z while enquiring about autronic stuff. Basically, he said that the to4z are only good if your looking at 23p.s.i. plus, as thats where they come into efficiency. He said that the gt3540r .82 was about as big as you'd go for anything 1jz and street registered.

Maurice Diggler
Goo Roo
Victoria
Twin Turbo

Posts: 1095
Reg: 06-2006

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 08:33 pm, by: Maurice Diggler (Mau_rice)

Shane McInnes wrote on Friday, March 09, 2007 - 06:18 pm:
Gotta give Toyota Credit though, Its amazing that the Auto Gearbox can handle 250 - 270rwkw with a shift kit. Thats alot of power. 100 to 130 more Rwkw than its expected to handle.

Also doing it when it's 13-14 years old

Cihan Aday
Goo Roo
Plug-in Emanage's - Now Available - Tuned to spec
JZZ30

Posts: 1816
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Friday, March 09, 2007 - 10:52 pm, by: Cihan Aday (Cihan)

Chris Davey wrote on Friday, March 09, 2007 - 09:59 am:
question: does the amount of boost required actually matter that much? e.g. say both of the above cars were making 280rwkw and one used 18psi and the other 21psi. Which is harder on the engine? They must both be ingesting the same amount of air and burning it with the same amount of fuel to make the same power but would the less efficient 21psi GT30 be harder on engine internals? I don't think it would be but could someone comment on that?

For arguments sake lets say they're exactly the same engine and the only thing differing is the turbo. The smaller turbo needs to push more boost to produce the same power because of the exhaust side restriction (which causes reversion etc) and the fact that compressor side efficiency plummets after a certain flow capacity lifting intake manifold charge temps. Because charge temps are higher there is a rise in peak cylinder pressure and temperature, subsequently these is a higher chance of onset detonation and in most cases timing needs to be pulled a little more to accommodate.

If we consider both cases, lower intake temps, lower peak cylinder temps and greatest engine longevity is achieved with the larger, more efficient, less restrictive turbo.

Chris Davey wrote on Friday, March 09, 2007 - 10:00 am:
oh and relating to that.

2 cars both make 280rwkw. One uses 20psi and the other uses 15psi and a shot of nitrous. Any difference to engine internals?

Nitrous lowers intake charge temps significantly, this reduces peak cylinder and peak EGT enough to allow more safe power. In most cases, you don't even need to pull timing much/at all when adding a 50hp-100hp shot.
I'd say a 1JZ engine making 280rwkw with the aid of progressive NOS will last longer than a 1JZ making 280rwkw all turbo.

In the end its got less and less to do with boost, boost is determined by restriction (intake manifold, intake port, exhaust port, exhaust manifold etc). Less restriction = less boost = safer power. Ideally, you'd like to max out a gt35r at ZERO psi