So I have an s4 TII with the following power mods:
Full RB Rev II Turbo-back Exhaust
Streetport
BNR stage 4 Turbo
Haltech e6k
Cone filter intake (no AFM) to stock IC
Venom 255 Fuel Pump
550/720cc Injectors

So I know this is a fairly common setup but I was wondering what hp numbers people think this setup will net.

I am also curious as to what difference people experienced with the addition of a frontmount, because that is the next mod I'm considering.

No, the car doesn't run right now (no spark... ) but I'm taking it to Shook Motorsports in Rockford IL in a few weeks to have him get it running, and tune it.

awww... isn't she cute

 

So, I was talking with my tuner and he expects my hp to be somewhere between 300 and 350 which is great. He also said that I will be pretty much maxxed on fuel at that point. has anybody else gotten 350hp with a similar fuel setup?

 

you will need more injector. that's less injector than what FD's come with stock (they have 550/850 side feed injectors which do not work on FC's).

 

with bigger injector and intercooling, good for 400.

 

depends on the dyno you're on and how much boost you're going to run. @15psi, i'd expect around 290-310hp on a normal dyno. the more optimistic the dyno, the higher the number

 

Thanks for the input guys.

Since I have a haltech I can put whatever Injectors I want and just adjust the fuel map right?

so since I already have 720cc secondaries I'm thinking of just getting a pair of 1600s for secondaries and using the 720s as primaries and having done with it in case I want a bigger turbo in the future. Is this wise/going to work?

 

720/1680 will be plenty of fuel. that's what I run with my T04R which is bigger than a BNR stage 4

 

I realize that that will be plenty of fuel, my concern is that it's TOO MUCH.

I just want to be sure that you can tune the extra fuel out of the map on a haltech so I don't run retardedly rich...

 

thats the BEST way to go about it.

its more trouble to add fuel than it is to remove fuel.

i would like to state that the stock top mount ic will limit your max hp with that turbo, and you should look at other means of intercooling the intake air besides a top mount.

 

well technically it would be easier to tune idle and low load if you just got two 550cc primary injectors.

 

Ok so basically, you can't ever have too much injector. Good to know lol. And ease of tuning isn't as big a concern for me as lack of fuel since i'm not the one who's doing the tune.

Anybody have a set of 1600cc injectors for an s4 they want to sell please pm me

Also yes I know my tmic will limit power but I just don't have the cash to buy a frontmount setup right now. I was just curious if anybody else has done this and what their results were.

 

You can have to much fuel. The bigger the injector the less time it stays open to get the right amount of fuel under low load situations. You can get to the point where injector dead times and the battery offset start effecting the low load fueling and it almost wont or doesnt idle.

 

yeah, this is basically true. but you can idle a 13b with 2000cc injectors. youd have to pay a lot for the injectors though.

 

I think you'd be happy with 550/1200

 

This set-up tuned by Steve Kan; 322hp @ 12psi (Tuned on two spark plugs, due to malfunction of second trailing coil.)

1600cc secondaries, 720cc primaries, Walbro 255lph fuel pump, Racing Beat REV-TII exhaust, TII drivetrain, ACT HD clutch w/ ACT SS performance disc, ACT Prolite flywheel, 3mm apex seal + rebuild with mild street port, custom intake, A'PEXi Power FC for FD3S with Banzai adapter, BNR Stage 4 turbo, custom FMIC set-up + HKS SSQV III BOV, remove all emissions, cheap aftermarket FPR, Koyo radiator... (The BNR stage 4 is rated up to 400hp.)

I know I could get a hell of a lot more out of this set-up. I didn't want too much boost yet... Not enough miles on the engine. In the end, my goal for 300hp was definitely reached. This car runs STRONG, and with great response. Good luck with your 300+hp build!

 

ok, so I think I'm going to go with 720/1000 injectors since it will give me some good headroom, but not overkill.

Also, Ryan @ Shook Motorsports was telling me that Injector Dynamics injectors are superior to say, some bosch injectors and that with the Injector Dynamics injectors he could tune out things like a stumble when the secondaries come on, whereas with the boscch ones that wouldnt be possible. Or at least there would always be a stumble, he would just be able to minimize it. Anybody know anything specific about Injector Dynamics? Experience?

 

I think before you buy anything/ change anything or before you get your car tuned you should do more research on setups like yours, injectors that are out there, how much fuel needed to make xxxhp. there is SOOO much information on this forum and many others. To answer your question. ID (injector dynamics) injectors are one of the best injectors you can buy atm (personal opinion). There are many suppliers that sell the "newer" style injector but basically the 2 most common talked about suppliers are FIC(fuel injector clinc) & ID(injector dynamics). when i say 'newer" style injector i am referring to FIC's and ID's. Now google FIC vs ID's or older bosch injectors vs newer. ect. You should be able to gather all your basic information from google

 

alright, so what I gather is that the ID injectors are of higher quality and are able to be tuned with a much higher degree of accuracy. They are however pretty expensive, and I dont have the cash laying around to get 4 of them, especially since I already have the 720cc injectors.

so... is there any benefit from just getting 2 ID 1000cc secondaries and re-using my 2 older style 720cc primaries? or should I just not bother and get 2 cheaper bosch injectors for my secondaries?

 

That's up to you... I have no problem with my Bosch injectors.

 

Sell all the injectors you got. buy 4 ID 2000cc's and be done with it. never look back. why do the same procedure over and over again. Im sure, just like 90% of the people that make 300hp 6 months later they want 400hp...it kinda goes that way. FFE can get you good prices on ID injectors. OR just sell everything you got and get 4 FIC's. there very similar injectors. why do you NEED to drive your car atm? is it your daily driver?

 

over the course of researching over the day, yes I pretty much came to that same conclusion. Although I'm going to go with 4 x 1000cc ID injectors, since 720 and 1000 are the same price. Also, with ID injectors you can actually idle like stock with 1000 or even 2000cc injectors, which is just not possible with ye olde bosch 1600s. So basically I get plenty of overhead for when I get an FMIC or upgrade my turbo, and at the same time i get new injectors that will give me better gas mileage and a steady idle. only drawback? they're $115 a piece... (the 2000cc are $240 so unless I plan on making over 500hp I'll be just fine with injectors half the cost) but i suppose they'll pay for themselves in time.

and yes, I have to carpool/take the bus to work because my 7 is my only car.

 

Is it ok to run 1000cc injectors for primaries? I always hear of set ups with smaller primaries...

 

How much was that BNR turbo??

 

BNR Website

Products: Mazda Products: RX-7 2nd Generation

 

yes