Saturday, January 04, 2014 - 01:44 am, by: Corryn Anderson(Cozza)
Hey guys. So I have a 97 vvti single turbo factory manual and lsd. I don't use it for drift, drag or track for now. At the moment it's just my weekender. Anyway mods so far are 2.5 inch turbo back exhaust with hi flow cat , coil overs, turbo timer, super spark coil pack. So I'm looking to keep it looking stock as possible but I really need more power with out damaging any internals. so I'm stuck on what the next step would be. Ecu piggy back or full replacement. Boost control Injectors and what size Fmic and how necessary is it for what I want. slotted calipers and 4 pot breaks. And that's what I would gather I will need to do from reading other posts. I'm stuck on what to get next and the order to install them. So as I'm sure you gather I'm new to whole thing and I don't really have anyone close by to ask. So I'm sure this is the best place to ask. I'm sure I've left some vital info out so please ask and I will answer the best I can. And thank you to anyone who has any input.
Mark Pattel TryHard Queensland 1JZ-GTE RT142 Corona and SR20DET KE55 Corolla
Saturday, January 04, 2014 - 02:13 am, by: Mark Pattel (Mark1414)
Not fully up on the VVTI modification path so if some of it is slightly wrong I stand corrected.
I would look into doing some intake modifications first if you still have the standard airbox it can be modified or you can go something like a pod filter. From there I would look into a intercooler kit. After this it should be safe to look into some boost control and raising your boost up a little (not sure how high people go on VVTI's though sorry).
At that point if your not happy with your power it can get pretty expensive. Tomei sells bolt on turbo kits. Also some members have had their stock turbo rebuilt with different internals. Which has the advantage of looking stock. If you went down this path you would need to look at larger injectors and some sort of aftermarket ECU to get the most out of it.
Saturday, January 04, 2014 - 06:32 am, by: Ali Saeed(Ali)
Mate depends on your power goals. Stock turbo will run out of a puff at 17psi. Tomei bolt on kit, which looks stock, will probably max out at 300rwkw. If you are going to get an after market ECU please make sure it can tune the vvti. Injectors and fueling mods also depend on the power level.
The 1JZ internals will be fine at 300-400rwkw so dont worry about that
Steven Soknacki TryHard Ontario '92 SC400 and '94 GT-T Limited
Sunday, January 05, 2014 - 09:38 am, by: Scott Vim(1uz1jz)
The vvti 1jz is a bit harder to get power out of. If you don't want to blow the stock turbo up don't go more then 14psi. It still won't hold boost up top. You will notice it can hit full boost (14psi) at around 2,400rpm. And the down low power feels amazing but it won't hold 14psi boost at 6,000rpm. It would usually drop to 12psi at 5000rpm and 10 psi by 6000rpm. So it depends what you want. Max power from the stock turbo is 200rwkw. It's very responsive and there is more power then what it seems on paper. This is because it doesn't hold 14psi through the rev range. With a high flow/steel wheel people running 16 psi all the way through the rev range usually make about 220-230rwkw. It would be slightly less responsive then stock. I put the tomei on. Incredible value for the vvti since cracking over 200rwkw is difficult with the vvti. Let me say its pretty laggy now. It begins to build boost in the lower revs but doesn't really rush to full boost (18psi) until 3500-3800rpm. Then it pulls hard all the way to redline. So on the street it seems a bit slower then before. To hit boost in 2nd gear you'll be speeding. On the track is another story, tomei is the best. So I'm happy with it but considering mostly its a weekend car I probably would have been better off with high flowing the stockie.
The tomei makes 265rwkw (manual- I've seen auto to make 255rwkw) at 18psi without cams. With the cams it is said to make 300rwkw.
My advice is figure out what you want. Power or response. High flow in between power and response but prob not best value. Put boost controller run 14psi. Fmic if you want. Will help with running higher boost. Don't do injectors unless you upgrade the turbo. I run emanage ultimate. But for 14psi stock turbo you won't see huge gains, this is the last thing you do usually after turbo and injector upgrades.
Best value is just boost controller, turbo back exhaust, fmic. If you will change the turbo then injectors, ecu, and maybe clutch go with it.
Monday, January 20, 2014 - 11:07 pm, by: James Buchan(Jrbuch)
Agreed with everything Ali and Scott said.
Kurts dump pipe made a massive difference when I chucked that on. The turbo spooled up much quicker, so if you're just looking for a little bit more grunt, this would be where i'd spend my cash.
Take a look at my profile; that will give you an idea of what route to go down.
Here are my observations thus far on vvti ownership.
I'm now running a 4inch dump on my Tomei ARMS turbo, into a single 3.5 straight through exhaust, no cat, Apexi N1 Muffler. That gave some good gains over the old dual 2.5 inch exhaust.
The Tomei is breathing much better now without the restrictive 2.5inch exhaust. With the traction off, it'll wheelspin like crazy, and step the rear end out. Estimate, 260rwkw - give or take a little, as I made 255rwkw (through the auto) with the restrictive 2.5inch exhaust. As Ali said, get an ECU that means you can tune the vvti (i.e Haltech 1000 Sport, VipecV88) you'll be able to minimize lag that way. Also, make sure your injectors are large enough to cope with E85 (Think bigger than 650cc's) that way, you'll be able to crack 300rwkw if you run the M8280 ARMS Turbo. You could possibly make even more with the Tomei Poncams as well.
Finally, if you get a standalone ECU, you can ditch the J pipe and the AFM, and have it running via MAP sensor. By doing this, it allows you to have a more direct intake to the turbocharger, which will increase spool and response - which in turn will help cut down on some of the lag a larger turbo gives.
Saturday, February 08, 2014 - 07:26 pm, by: Corryn Anderson(Cozza)
Thanks for all the input. And knowledge. Now I have my to do list, it's all up to my bank account. lol Over the last month my other soarer has been eating it up. Rocker cover seals rear main seals steering rack the list goes on. Next month is the vvti's time to shine.