Tuesday, September 02, 2008 - 11:06 am, by: Maurice Diggler(Mau_rice)
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
Tuesday, September 02, 2008 - 02:03 pm, by: Charlie Ters(Ul05st)
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.....
Tuesday, September 02, 2008 - 08:16 pm, by: Daniel Clarke(Dieseltrain)
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.
Wednesday, September 03, 2008 - 10:02 am, by: John Street(Rex2ce)
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
Andrew Stewart TryHard Queensland Manual GT-T VVT-i Single Turbo
Wednesday, September 03, 2008 - 12:14 pm, by: Andrew Stewart(Daboom)
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.
Wednesday, September 03, 2008 - 12:59 pm, by: John Street(Rex2ce)
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.
Wednesday, September 03, 2008 - 10:41 pm, by: David Wojcik(94tt)
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?
Thursday, September 04, 2008 - 03:54 pm, by: John Street(Rex2ce)
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
Saturday, September 06, 2008 - 06:38 am, by: David Wojcik(94tt)
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 .
Saturday, September 06, 2008 - 09:50 am, by: Cihan Aday(Cihan)
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.
Saturday, September 06, 2008 - 10:19 am, by: Daniel Clarke(Dieseltrain)
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
Wednesday, September 10, 2008 - 05:26 am, by: David Wojcik(94tt)
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???