Hi everybody,
I have just finished my N/A project and i need your advice on a matter.

First of all let me tell you what the car has:
1) JWT intake
2) Motordyne plenum
3) Utec ecu
4) DC manifold
5) Tomei 272 degrees cams + valve springs
6) Tomei test pipes
7) CP high Compression pistons (standard size)
8) Cosworth high compression Head Gasket
9) Supertech valves (standard size)
10) Work made on both cylinder heads (polished ports etc.) for better flow
11) Invidia true dual exhaust
12) Unorthodox pulleys
13) Nismo oil pump
14) Nismo thermostat
15) Nismo radiator cap
16) Os Giken twin clutch combo
17) NGK Greddy spark plugs Nr. 6

And i have been using the new ENEOS 0W-50 oils wich i am thinking of changing them to Motul 10w-40 cause the 0w-50 of Eneos although is good i need to add oil very often cause its very thin..

Anyway,
We had the car on the dyno and it showed us 335 bhp, but it seemed that it needed bigger fuel injectors cause after the 6,700 rpm something was wrong with the fuEL. Our goal was to go to 7800 rpm. My engineer told me that my standard fuel injectors could not provide the engine with more fuel, so we have the u-tec now programmed on safe mode to 335 bhp and too rich mixture in order to avoid any damage...

With such modifications do you think that i need bigger fuel injectors????
The wideband we used on the dyno was not working properly and i am afraid that maybe both issues made the problem appear.
What do you think?
Thanks

 

Does your engineer do what he does for a living and have a good rep backing him? If he does, then i would say follow what he says. If he doesn't then find another tuner that has the known rep and see what he says.

 

Get the wideband working so you can see how your AF's are. How are they tuning otherwise?

 

i will try to fix that shortly,
i just needed also to know if with all these modifications need bigger injectors, or not?
Thanks

 

Any more info? dyno sheet? or data logs will help to know your IDC. Noone can tell you really without something better info.

Is your pulley is light weight? if it is try ATI pulley. Also what year is yours?

 

What does 335bhp translate to the wheels?

 

Well he said he had the car on the dyno, so maybe he means that it logged in 335WHP...quite a lot though for NA.

 

I have similar mods and similar cams.

When Jeremy built his original 305 whp NA engine he started to run out of injectors. He used to have a turbo engine in his car, so he could make up the additional fuel requirements by bumping the fuel pressure in his dual-pump return fuel system.

When we chose parts for my engine build, I did not have a fuel return system or high pressure pumps, so we decided to install 400cc injectors in my engine. Somehow, 500cc injectors got installed. I didn't have any issues with the injectors, so if you have the money, get a set. I would go with 400cc as I originally planned. They aren't hard to put in. You will need to get a new tune for the larger injectors, though.

What's your location? Don't know where D1 is?


-jb

 

I was on stock injectors to 320whp, as well as stock rails, stock pump - 100% OEM fuel system.