Injectors for HKS t51r SPL BB
 

Hey guys.

Just got my hands on a HKS t51r SPL BB

This topic has most likely been covered in the past. I just wanted to know what primary and secondary injectors I would need to power this monster in my FD

Cheers

That can't be answered without knowing what other mods are done to the car.

More importantly: How much boost do you plan on running?

What are your horsepower goals for the car?

-Geoff

I would like to crack between 600 - 700 hp.

Currently have.

- Greddy FMIC with greddy tube
- Koyo Radiator
- Ogura Twin plate carbon clutch
- Pac Racing Manifold with external waste gate (not sure of the brand).

At the moment shopping for a fuel kit. Was thinking of the FEE one on rx7store.

Not sure on the boost question on how much I should be running.

The car will be used mostly on weekends.
Cheers

I'm also runninga wallbro fuel pump 400lph.

Would i better off running two 255 lph wallbro's. Or is the 400 sufficient enough ?


Is there any other modifications that I should be looking at ?

For pump gas 2 Id1000s and 2 ID2000s, if on E85/alcohol 4 ID2000s. 1 400lph should be enough on gasoline, will need more for E85/alcohol

^^^^

600-700hp you will need 4 2000cc injectors to make sure ou have plenty of fuel, to break into 600 you will need min 28-30 psi depending on porting and setup.

Looking at going a bridge port.

So 2000 cc for primary and secondary ?.

Argg..

Yeah, 4x ID2000's will be needed for that kind of power. Unless you want to run a high fuel pressure (80psi base) system and run the new ID1300's..

Walbro 400lph is excellent, I'm running one with no issues, however I'm around 500rwhp.

Also, in addition to that setup, the OP will likely need LIM/UIM and TB to break 600hp. IIRC the REW manifolds become a bottleneck over 600.

I was looking at getting that after market CNC billet throttle body - http://www.rotary-works.com/mm5/merc...e=RW-TB-RX7-FD

What do you propose for the Upper Intake Manifold and Lower Intake Manifold ?

bump..

13b re cosmo.

My friend running 700+rwhp had to run the cosmo manifolds to break 600. You may want to post in the single turbo section for help on that subject.

Cheers for the info.

You are also going to want to upgrade your ignition system. I would definitely go with two fuel pumps because the t51R doesn't have a very linear map. It comes on like a flood. Cosmo uim and lim is great too, the primary runners are the same size as the secondaries. If you get the rotary works tb get the 20b model. It will mate up to the Cosmo uim...but it will put the throttle on the other side. You'll need a better diff to. I'm at work but I'll chime in later.

HKS Twin Power and Stock Coils should cut it for ~600 i would think on race gas?

Thanks for the info guys appreciate it.

Can anyone tell me why exactly I have to run the primaries at 2000cc, when the secondaries are already 2000cc ?

Because when both the primaries and secondaries are on, you'll theoretically be able to put out 8000cc's of fuel.

With stock primaries and 2000cc secondaries you'd only theoretically be able to put out 5100cc's of fuel.

Big difference.

-Geoff

Ta.

So in terms of fuel economy for just normal street driving - having 2000cc injectors for primaries - Would you be wasting a lot of fuel ?

No. They aren't firing at 100% all the time. Your computer's tune will dictate how much fuel is needed for any given situation. When trying to make big horsepower numbers you will need a lot of fuel.

-Geoff

Thanks jeff. Greatly appreciate the info and advice.

Iv been doing more research on the Walbro 400lph as I'm wanting to turn up to 550rwhp.

I've found that the pump makes 400lph at 40psi at 12v, but begins to trail quite significantly in output as the pressure increases.

At 80psi the pump only provides around 225lph. If you are trying to run 500rwhp you need around 250LPH at 80-85 psi if you are running around 20-25psi of boost and you factor in a 15psi pressure drop by the fuel lines that must be overcome by the pump.

So it seems that 2 pumps may be needed to go beyond 500rwhp. Seems like ID's or not, the OP will def need two pumps to reach his desired output.

What do you guys think?

Hey Monster. Thanks for that info.

It wouldn't be feasible running one wallbro 400 and one wallbro 255 ?

Or could you ?

I don't see why you couldn't, that may work fine

Either two Bosch 044s
Or an aero motive stealth feeding an a1000.

Based on the questions youre asking though you seem like you're in a bit over your head. I would consider getting a better background before you do anything serious because these are the typical times when an engine blows up.