Another "How much Horsepower will I make if..." Thread
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 :) http://i7.photobucket.com/albums/y28...toshoot_06.jpg |
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?
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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).
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with bigger injector and intercooling, good for 400.
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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
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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
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Originally Posted by arghx
(Post 10711633)
720/1680 will be plenty of fuel. that's what I run with my T04R which is bigger than a BNR stage 4
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... |
Originally Posted by Osirus9
(Post 10711637)
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... 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.
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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. |
Originally Posted by Osirus9
(Post 10711665)
Ok so basically, you can't ever have too much injector. Good to know lol.
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Originally Posted by SpikeDerailed
(Post 10711697)
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.
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I think you'd be happy with 550/1200
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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? |
Originally Posted by Osirus9
(Post 10712631)
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? |
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.
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Originally Posted by Osirus9
(Post 10712827)
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? |
Originally Posted by just startn
(Post 10713337)
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?
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...
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How much was that BNR turbo??
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Originally Posted by T-Rex88
(Post 10715560)
Is it ok to run 1000cc injectors for primaries? I always hear of set ups with smaller primaries...
Originally Posted by Osirus9
(Post 10713396)
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.
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