boostinsc

Am just looking for a little more NA power that Is noticeable and can actually feel I will be doing the egr block off plate as well as re modifying my air box unit along with a heat shield so only cold air is being fed in. Also wanted to know is my megan exhaust holding me back ?

Justin2JZ

Not worth it. 2Js are weak as f*** while NA it'll sound better but will still be slow. Save for boost.

KahnBB6

iTrader: (5)

Bottom line:

Forget messing with the engine. Keep the stock airbox and throw in a K&N or something similar there. Just keep it fully tuned up with synthetic oil.

The only other attainable ways to have better performance (not more horsepower) while still NA are to:

-- Do a 5-speed manual swap
-- Keep your 4.27 rear end ratio (which gives the feeling of very short gearing with a 5-speed)
-- Install an LSD
-- Replace any worn suspension bushings, LCA's, etc.
-- Put in a good Supra style suspension that emphasizes road compliance and little body roll
-- Install a bigger SC style rear sway bar or a TT rear sway bar
-- Lance Alignment
-- 17x8 and 17x9.5 rims with Supra TT stock tire sizing of 235/45-17 front and 255/40-17 rear to stay close to the SC300 factory rolling diameter while greatly increasing tread contact area for handling
-- LS400 front brakes

A lot of the above things will be greatly needed when you have boost to play with. The only relevant change with a turbocharged engine would be the need for a 3.92, 3.77 or 3.26 rear end ratio (although to add 4.08 was the factory ratio for all 1JZGTE R154 5-speed Soarers).

If you're planning on boost sooner rather than later you should focus on those goals and not worry about your NA engine power.

boostinsc

Thanks Kahn i have an HKS filter in the airbox but as you know the stock airbox restricts airflow to the so by opening the snorkel or running a intake underneath to the bumper will be greatly increasing the air flow into the engine making the car breathe better or so I think and the only factory wheels that is possible to run those OEM size is Twin turbo Supra wheels. supra style suspension? Is tanabe eibachs or espellr fall under that category

t2d2

iTrader: (8)

Isn't stock 225/55-16 (25.7" diameter), or is that not the same for all SCs? 235/45-17 is 25.3" and 255/40-17 is 25.0". Did you mean 245/45-17? That's an exact match for the 25.7".

KahnBB6

iTrader: (5)

boostinsc -- Yes, you can just swap on 93-98 Supra MKIV TT wheels. Direct fit. They also conveniently clear 95-00 LS400 front brake calipers or TT brakes. For a spare tire you'd have to source a 93-98 TT spare or a rare SC430 spare (some of those cars were sold without Run-Flat tires) which is the same thing.

t2d2 -- I have forgotten my conversion math since it's been a while but I believe you are correct about the stock SC300 tire diameter. What was surprising to me is that when I went to compare factory Supra TT tire size OD's with the SC's factory tire OD's I found them to be very close.

Factory TT tires are indeed 235/45-17 front and 255/40-17 rear but I'm not sure why they did it that way. Perhaps to combat oversteer? As you say it certainly isn't an exact match for stock OD but it's very close if not a smidgen better for NA acceleration.

t2d2

iTrader: (8)

Nothing to forget or even remember, I just plug it into the tire size calculator.

I wouldn't consider 0.4" and 0.7" discrepancy particularly close, when 0.2" is the max tolerance based on suggestions I was able to find not too long ago. I imagine the smaller diameter would help with acceleration and maybe with handling, but that means everyone with Supra sized tires on their SC is running around with whacky speedo and ABS. Which could perhaps explain why there's such a split in views on the effectiveness of the SC's ABS system. Shorter tire life, as well.

KahnBB6

iTrader: (5)

I stand corrected then :/ I used a YellowBox V4 to cure the first issue. Handling and acceleration are helped by those tire sizes but it your point about the ABS system is a good one. I don't think anyone has looked into that yet.

boostinsc

[I]Recently Bought this from THMotorsports and will be installing soon when it gets warmer here in NY is freezing temps

Funnyman

I may be wrong but I was told you can't use the TT rear sway bar on the SC subframe

eight

iTrader: (1)

pretty sure you can't, need tt sway bar mounts or more iirc.

j/w, but i have been reading a lot(ish) about BFI's being a better alt to am intakes. is there any reason why you chose the one you did? is that a tt stock intake? did you pick it for your up-and-coming(in time) na-t setup?

Funnyman

From what I was told from an SC guru (or atleast what I got from him) to use the TT sway I needed the TT subframe as in part to why I'm buying it from him

t2d2

iTrader: (8)

You just need the subframe mounts and endlinks.

crenfro

iTrader: (2)

Why? Why do you need more NA power before turbo? There's literally no point as the price to results are not worth it. Don't worry about doing any kind of engine work because MAYBE you'll get 5-10 hp max from NA upgrades.

Just go ahead and turbo man, it's so worth it and these jz's love boost! Save yourself the headache of trying to squeeze power out and start the turbo build!!!

GL

Funnyman

Thanks for the info.. I'm aure it's been covered before but would there be an advantage to swapping to a TT rear subframe?