ShiftRX7

Hi guys, i would like to have your feedback on the next steps i should take with my FD; i have done quite some changes in the last 3 years, always aiming for reliability and driveability, but i dont know what should be done next.

First of all i would like to state that my vision is of a car mostly for fun during the weekend, with optimum street driveability (as it is mostly driven on public roads), making approx 330 reliable rwhps. Engine has been recently rebuilt and chassis currently got approx 70K miles

Car is waiting a paint job (end of the month), and here is the list of the mods currently on:

Engine:
Apexi Intake filters with hard piping
Blitz FMIC
HKS BOV
99 spec Y-pipe
Greddy Elbow
Fluidyne radiator
FC thermoswitch
99 spec turbos @ 12psi
Downpipe - resonated mid - catback japspeed
Air pump removed
Greddy pulleys
Apexi PFC + commander
1.3 bar Greddy radiator cap
AST delete
NGK wires and sparks

Fuel:
Supra fuel pump

Suspension:
Tein superstreet coilovers
Rotary extreme trailing arms
Rotary extreme toe links
New pillow ball bushings
Drag DR6 18" alloys

Other:
HID conversion
Carbon fiber vented hood
Apexi turbotimer
Autometer gauges (boost, oil temp, wideband)

So what would you suggest to improve? I thought of these possible areas:

water/meth injection
fuel system upgrade

Thanks in advance for your feedback.

93rx74lyfe

iTrader: (1)

Have you done any brake upgrades? My advice would be ss lines and some grippy pads.

Montego

iTrader: (1)

water injection and enjoy?

muibubbles

iTrader: (36)

mods to mod more or to get you settled?

water meth def
premix
ss brake and clutch line are nice

you got a good amount of mods, should be sufficient

Force13B

iTrader: (19)

Rebuild the calipers as well the parts are cheap it's like 35$ for the rebuild kit.

NVMYRX-7

iTrader: (24)

A HKS Twin Power

Montego

iTrader: (1)

^^ for 12 psi on stock twins?

ShiftRX7

Thanks for the input..it appears as water injection and brake lines/rebuild should be next on the list.

is there any real added benefit at this hp level from the hks ignition?

I may go to 14psi (not sure of the right boost to obtain the desired hps) but i want to be sure to be safe there - never dynoed it

NVMYRX-7

iTrader: (24)

No one ever stays @ 12psi

93rx74lyfe

iTrader: (1)

If you have never been on the dyno that should be the very next thing. Also what are you using for your secondary injectors? The stock ones tend to crap out at 12psi.

ShiftRX7

i'm still sitting on the stock injectors, 550s and 850s, that's why i was mentioning an upgrade to the fuel system in the possibilities, especially before running higher boost...what's the best option there to get some additional fuel? some larger secondaries? i've heard of the possibility of getting more flow from the stock ones with minor modification to them while keeping the side feed stock fuel rail...otherwise i will have to go top feed and the thing will become more expensive...

NVMYRX-7

iTrader: (24)

Get a set of larger secondaries and call it a day, don't waste money and time replacing the primaries. There will be a lot of discussion about different set-ups but I have found that if you are staying twins and under 400 hp you are better off with 500 primaries and 1300 or 1600 secondaries in the stock rails.

twinsinside

iTrader: (34)

Idler pulley, oil pan brace, diff bushings, EBC/MBC, street clutch/flywheel, FPR w/FPD elimination, fast air temp sensor from fighters/wannaspeed

I don't see why you wouldn't get an HKS, since a powerful spark at any level of HP is desireable

RC engineering/Witchunter can bore out a stock set of secondaries to 1300 for you, no need for overkill on a street car. Since you've already pulled the air pump though you could go with a set of ID 2000's on secondary and have lots of room for growth.

I've heard putting 850's in the primary is kinda tough to get a decent idle, and you have to mill out the rail, but I've never tried it myself.

curacaosfinest

iTrader: (12)

i'd say definitely fuel upgrade at this point man

get a bigger set of secondaries (usually 1300s, or 1600s) and an fuel pressure regulator and re-wire your fuel pump

and definitely get some water/meth injection
and the HKS twin power

another mod would be getting a nice wheel/tire setup
i dont know the condition of your car but some restoring of your interior/exterior is usually in order if you havent done it already...u gota look good when your going fast

ShiftRX7

Thanks for all the feedback; so summirizing:

- fuel system upgrade
- water injection
- ignition
- brakes

seem to be the most popular choices.

Regarding appearance, car is flawless outside and im already doing some maintenance to the inside.

twinsinside

iTrader: (34)

I'd definitely get an idler pulley with those greddy underdrives, you'll wear out your bearings and/or get water pump slippage.

93rx74lyfe

iTrader: (1)

Just out of curiosity what would be the general rule on maximum boost levels for a car with stock primaries and 1300cc secondaries?

GoodfellaFD3S

iTrader: (213)

It's related to injector duty cycles and power levels moreso than boost levels. For a stock twin car at 'reasonable' 1 bar or so boost levels 550/1300 is more than enough.

Gabe, I'm glad you got all the parts safely and installed them already

I agree a lot with what's said here, also I can't remember what tires you had on when we went for our joyride in downtown Milan, but consider some high-end sticky street tires.

I'm a big fan of the Aquamist 1s system for your application, it's simple, reliable, and works very well.

One thing we had discussed in the past is finding a good rotary tuner, especially if you upgrade your fuel injectors. Have you tracked anyone down?

ShiftRX7

Thanks Rich for your always useful advices, especially when you where here in Milan! I hope i can pay you a visit anytime soon in NJ...I have nearly finished installing all the parts you sent me, im closing the suspension area this weekend; i cannot thank you enough for your help getting the parts.

Im currently running on Pirelli PZero Nero tyres, they are very good and sticky...only downside is consumption and price

For the tuner, i have spoken with a lot people lately and i have found at least two skilled ones with wide experience with PFCs; i have been reading a lot here in the forums on PFC settings lately so i have started already working on it and im pretty pleased with the results i was able to achieve on my own...but i will visit one of them next weekend after car is back on the road for a final review of every setting.

I need to get more infos on how these water injection system works and are installed, if im correct aquamist company is in the UK right? i may visit them to have a closer look at the product and installation as im frequently around london for work reasons.

Question: what is the best and quicker way to get the 850s bored to 1300s? or is there anyone who selles already 1300s? not being in the US is quite a downside when speaking of getting parts...

gracer7-rx7

iTrader: (16)

I'm always a fan of KISS. Sometimes people get carried away with mods as evidenced by some of the items some people listed.

RC Engineering is the place to go to bore the stock secondary 850cc injectors - http://rceng.com/
You may want to consider only getting them bored to 1200cc. Sometimes they do pop up here in the Classified section already bored out.

Do be careful with the tuning. Tuning a rotary is a bit different than tuning a piston car. There is less room for error as the engine doesn't tolerate bad tuning very well.

Montego

iTrader: (1)

Fair enough but fuel comes first in that case, then the boost can be raised, and last a twin power (if needed).

Gorilla RE

iTrader: (1)

If you put a Twin power on a stock FD you will notice a difference. "Needing" it isn't always a case of modification time lines.....

-J

Montego

iTrader: (1)

A twin power does offer some nice side effects (a nicer idle for instance) but unless the car is running like **** there are other things that $400 can be better spent on.

gracer7-rx7

iTrader: (16)

I honestly don't notice a difference with or w/o the Twinpower on my mildly modded ~320 rwhp car.

twinsinside

iTrader: (34)

Everything comes down to budget and goals in the end, but honestly part of the enjoyment I get is working on the car and trying different things.

Yes it's expensive, but just owning an FD means you'll be showering it with money anyway

Another consideration would be making the decision to go OMP or OMP removal + premix. If you don't want to premix another good mod for reliability would be a mikuni OMP, RA adapter and an external tank for the 2 stroke. If you're going to keep the OMP you might as well get the SS lines for it as well, since the price difference is basically nothing and the plastic ones can be a pain in the butt.