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David Wojcik
Tinkerer
ACT
Soarer(TT)

Posts: 7
Reg: 08-2008

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Tuesday, September 02, 2008 - 08:15 am, by:  David Wojcik (94tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

No. 1 goal is to increase torque at lower rpm range.

My car is non vvti and i'm after the same output as a vvti. (since going in a friends chaser vvti)

I want at least 400Nm+ before 3000rpm.

I was thinking a custom GT28 rated at 450hp.

please any help would be greatly appreciated
Christian Molenda
DieHard
QLD
T

Posts: 863
Reg: 07-2005

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Tuesday, September 02, 2008 - 08:22 am, by:  Christian Molenda (Christof) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

gt28 is way too small from a 1jz.. maybe some gt30 series turbo.
Maurice Diggler
Goo Roo
Victoria
TR44 HF

Posts: 2052
Reg: 06-2006

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Tuesday, September 02, 2008 - 11:06 am, by:  Maurice Diggler (Mau_rice) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

A 3L bottom end will blow your mates VVT-i torque out of the water... :-) haha.

Seriouisly though, you could fit a full aftermarket ECU and get intake / exhaust cam gears, advance the intake and retard the exhaust... It's not VVT-i but it's as close as you'll get. Much cheaper than 1.5JZ too :-)
Benjamin Burgess
Goo Roo
NSW
Toyota Corolla Conquest

Posts: 1908
Reg: 07-2005

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Tuesday, September 02, 2008 - 12:24 pm, by:  Benjamin Burgess (Jampac) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

more Cubes or small variable geometry turbos is the best methods to get more low end torque.
Charlie Ters
TryHard
nsw
'Single' biggest mistake :-)

Posts: 364
Reg: 01-2007

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Tuesday, September 02, 2008 - 02:03 pm, by:  Charlie Ters (Ul05st) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

a good tune always helps as well.....
I still remeber driving to the dyno with Cihan, and from light to light, he would make changes to the ECU settings on the fly, and immediatly boost was starting to arive quicker and quicker, and there was more of a 'torque' punch down low..... :-)
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 3912
Reg: 03-2006

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Tuesday, September 02, 2008 - 08:16 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Christian Molenda wrote on Tuesday, September 02, 2008 - 08:22 am:

gt28 is way too small from a 1jz.. maybe some gt30 series turbo.




I would like to see someone try... Although why not try a Gt3071R that should come on hard and make 250-260rwkw @ 22psi boost...

Or a Gt2876r for that matter.

Yes i know its not the " Ultimate iwannamakelotsapower " turbo for the 1JZ, but if you want TRUE low down streetable torque, surely this turbo could work well?

BUT.. you will not compete against a VVTI for low down response unless you go the same route... SImple.
Christian Molenda
DieHard
QLD
T

Posts: 864
Reg: 07-2005

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Wednesday, September 03, 2008 - 07:02 am, by:  Christian Molenda (Christof) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

if you want low down torque, supercharge it instead or get rid of the turbos and raise the compression...

i do think that the 2876 will be choking the engine will probably not be able to make the same power that the stock twins would make.

however if you go twins of these...
John Street
TryHard
NSW
Soarer TT

Posts: 142
Reg: 08-2005

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Wednesday, September 03, 2008 - 10:02 am, by:  John Street (Rex2ce) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

David, This is a Dyno chart for my car fitted with a GT30/37 and a few other bits. I've no idea how to decipher this chart so maybe someone else can explain the readings to both of us. I cant see any reference to torque. Hope this helps
Upload
Andrew Stewart
TryHard
Queensland
Manual GT-T VVT-i Single Turbo

Posts: 220
Reg: 06-2007

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Wednesday, September 03, 2008 - 12:14 pm, by:  Andrew Stewart (Daboom) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

the dotted line is your PSI. of which reads on the right hand scale. the other is your horsepower which reads on the left hand scale. the bottom one is your RPM as it states. this way you can see where your boost reads at what RPM and the same for your HP. you are correct as there is no reference to torque. where you had your reaing done, they should be able to bring back your dyno chart and add a torque reading to the list. however Dyno's do not read in the standard Nm or Foot pounds of torque.

Really in relation to the thread, the best way (from what i have read) is to have a setup like an RX7 where you have a small turbo for low down, then transfers to the larger turbo for high up pull, or go for something in the CT15 - 20 sized turbo off either a VVT-i 1JZ, or a 3sGTE. The main reason for the VVT-i 1JZ's having so much torque down low, is not solely contributed to the single slightly larger turbo as many speculate. it is also due to the re-designed head with different flow characteristics of the inlet and exhaust valves, and the combustion chamber design. and yes the VVT-i does also compensate for the low down torque.

Hope it all helps :-)
John Street
TryHard
NSW
Soarer TT

Posts: 143
Reg: 08-2005

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Wednesday, September 03, 2008 - 12:59 pm, by:  John Street (Rex2ce) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Andrew thanks for the info, to me the torque figure does not matter , all I know is, put your foot down - it is gone.Makes my previous V8 seem pedestrian.
David Wojcik
Tinkerer
ACT
Soarer(TT)

Posts: 8
Reg: 08-2008

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Wednesday, September 03, 2008 - 10:41 pm, by:  David Wojcik (94tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

that's some nice power john,
what's it like coming on boost?
and what setup do you have?
eg, exhaust, cat, ecu, turbo rear housing size, stallie & shift kit?
John Street
TryHard
NSW
Soarer TT

Posts: 144
Reg: 08-2005

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Thursday, September 04, 2008 - 03:54 pm, by:  John Street (Rex2ce) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

David,
Car has front mount 100mm Blitz intercooler, supra injectors, Garrett Single turbo 30/37, 45 mm external waste gate, HKS manifold, Bosh fuel pump, 3" dual xforce mandrel bend exhaust system, E manage computer with hand controller E01, Turbo timer, 1.5 shift kit.Supra calipers and rotors. Takes a bit of time to spool up , but worth the wait
David Wojcik
Tinkerer
ACT
Soarer(TT)

Posts: 9
Reg: 08-2008

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Saturday, September 06, 2008 - 06:38 am, by:  David Wojcik (94tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Just wondering if it's possible to have a setup,

so my turbo's come on 1 after the another like the supra or rx7 ser6 = Bi-Turbo :-) response:-)

(for those of who don't know it works like this i think)

the first turbo kicks in at 1500rpm and eases off at 4000rpm and the 2 turbo kicking in at 4000 up until redline. :-)sweet:-).

(simple 1 is for low end and the other is for midrange to topend)


Just wondering if it's possible and how much would this type of upgrade $$$$ cost?
All i want is response and 300rwhp not 300rwkw


Ok i was thinking maybe you can just change the turbo manifold to full custom and get a standalone ecu like haltech or something????


Or could you do something like this
-get a smaller turbo like a GT2860RS(Disco potato)
-get a larger turbo like a GT3540
-Set up a manifold for it to be bi turbo (?somehow?)
-use small turbo for 2000rpm 4500rpm range
-use big turbo 4500rpm til redline
-Tune it
=response/Monster
= $$$$ and mayb and extra $ on the end
could it be done for under $7500
You gotta admit it would be cool if it worked as planned :-):-).
James Harris
Goo Roo
QLD
XTR T-66 Turbo

Posts: 1879
Reg: 07-2005

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Saturday, September 06, 2008 - 08:01 am, by:  James Harris (Haro) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

anything is possible mate... but no chance for under 7500 .

Thats my opinion anyways.
Cihan Aday
Moderator
Good ol' Victoria
JZZ30

Posts: 2654
Reg: 07-2005

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Saturday, September 06, 2008 - 09:50 am, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

David,
If you're after 'response' why not stick with standard turbos and have the standard stall converter modified for a little extra slip, say 3000rpm flash.

On the cheap that's you're best option. With a set of custom dump pipes and a 3.5inch collector / front pipe stockies are fantastic. Even consider hybrid / ball bearing turbos.

If you have the money to look for 'response' then you can do a 1.5JZ engine conversion for that price and run standard turbo's with the 3L bottom end. Even then, i can guarantee you'll be after more power within a few months - in which case your costing will be blown out of the water.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 3921
Reg: 03-2006

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Saturday, September 06, 2008 - 10:19 am, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yeah, im with Cihan on this one.. You cant beat the stockies for response.. a 2800-3000rpm convertor will make it even more fun! And you can easily reach your goal of 300rwhp and will do that at 14-15psi easily! IM currently making 345rwhp on 17psi on pump fuel with stock injectors :-)
David Wojcik
Tinkerer
ACT
Soarer(TT)

Posts: 10
Reg: 08-2008

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Wednesday, September 10, 2008 - 05:26 am, by:  David Wojcik (94tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks guys,
looks like i will get the stallie and shift.

-2800rpm stallie
-stage 1 shift kit

which piggy back ecu is best?.

just waiting for my trust mx twin catback system to arrive, which is in 4 weeks :-).

I swaped for it the trust single catback i had sitting at home doing nothing, and plus the single system was very loud and would get defected in canberra cos that's all cops can do here. (OINK OINK, oops i mean defect)

Anyway one more question ok guys can anyone get through to lew rabourn i wanna get the twin dumps n front pipes that go all the way to the cat.

Or is thier a good jap brand system that you can get after market for approx $1000 mark???

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