Overfuelling - Injectors Problem ??


Haribo1187

Haribo1187

... H20 RBO ...
Donator
Joined
May 4, 2007
Messages
388
Hey Guys...

Just started my car 2day after £££££'s spent on the engine.. It started fine first turn and idled great but then it started to get irratic then finaly cut out..

After removing the plugs I noticed they were soaked with fuel.. Defo an over fuelling problem.. I think it may be down to my injectors as they are 440cc and im not running any stand alone managment yet to controll them..

My Spec is.....

My Starlight Black Ek9 2000 Rx

ENGINE

Spoon 1.8 Stroker Kit - 81.25
Spoon 2pc High Comp Head Gasket
Skunk2 High Comp Valves
Cylinder Head Ported , Polished And Gas Flown
Skunk2 Stage II Cams
Skunk2 Titanium Valve Springs And Retainers
Skunk2 Adjust Cam Gears
Skunk2 70mm Tb
Skunk2 IM Machined To Match 70mm - Polished And Gas Flown
Skunk2 Carbon Composite Fuel Rail
Walbro Fuel Pump
RC 440cc Injectors
AEM Cold Air Intake
Hytech 4-2-1 Manifold
DC Sports De-Cat
Spoon B-Pipe And N1
Exedy Clutch And Flywheel
Spoon Engine Dampner
Spoon Engine Mounts
A/C Removed

Are the 440cc injectors the cause of overfuelling and what can I do to stop it ? Will I need to replace them with smaller or will a Hondata remap solve the problem ??? Im very confused...

Blinx your the man on this subject - Prior apreciation :bow:

Cheers - Andy
 
If your using a stock ecu then thats your problem. DONT. You need this kind f setup tuned properly. what are you using ecu-wise?
 
Haribo you gotta get a video up of that beast when its running properly. How do you find it so far?
 
EK9turbo said:
If your using a stock ecu then thats your problem. DONT. You need this kind f setup tuned properly. what are you using ecu-wise?
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well he has not long just got his engine back from getting tuned. its the std ecu thats in it but he has not run it on that and not going to. he picks up his p28 ecu with hondata tomorrow night then think its getting re-mapped at the weekend. will they injectors be ok once he gets his car on the dyno and re-mapped or will he need smaller ones
 
yeah its just the standard ecu.... So rule of thumb, can the hondata managment control the injectors ??? - So I wont need to replace them with 310s ??? The reason I went for 440 is so I could run ITBS and Nos in future.. Im very confused :angry2: lol
 
Haribo1187 said:
yeah its just the standard ecu.... So rule of thumb, can the hondata managment control the injectors ??? - So I wont need to replace them with 310s ??? The reason I went for 440 is so I could run ITBS and Nos in future.. Im very confused :angry2: lol
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DONT run it with the standar ecu you'll feck it.! let the tuner tune it properly. Who assembled the engine for you? its going to be a nice setup but you HAVE to be a bit patient :nice:
 
how much bigger are the injectors compared to stock? Running 80% max flow is best suited to your HP goals
 
The best solution is to remap for the new setup. Because I think that you have combination of unmached things:
Walbro that makes 80 psi and 255l (probably) with 440 injectors and stock ecu?!

But if you have mechanical problem then remaping will not work. So, check out your FPU if it is working properly for first and second Check sparks.
 
You have to tune, that's for sure, but 440cc looks to big for this set up.

(440/5)*4= 352HP

(310/5)*4= 248HP

Stock is 260cc.
 
I had a virtually identical set up on my old dc2. I fitted Prelude 2.2vtec injectors and they were perfectly matched, fueling was spot on. It made just over 240 bhp :drive: :shocked:.

Good luck, Dunx
 
looks like ek9turbo has this one under control, i agree with everything he says :nice:

i do however disagree with Edu.T, 440cc is good up to 300whp in my experience, nothing wrong with that size injector on an NA motor in my opinion, 310cc is too small, you need a lot of fuel at 9000rpm...
 
Have you considered using a fuel pressure regulator(with pressure gauge) to reduce the fuel pressure?
________
ZOLOFT LAWYERS
 
Last edited:
EK4_SIR said:
Have you considered using a fuel pressure regulator(with pressure gauge) to reduce the fuel pressure?
Click to expand...

he has a fuel reg and gauge the car has not long come back from the tunning shop. the engine has only run for about 10 sec then over fuels nothin has been set up proper yet it was also started on the ek9 ecu keeping in mide it is now a 1.8L now not a 1.6. so it now has a p28 with hondata will be gettin re mapped next week and set up on a dyno that will sort out the over fueling problem
 
hmm, I reccommend changing your injectors, its way too big!

if its only pumping less than 60% MAX, then your spray pattern isnt good, and could flood the combustion chambers. Even if you tune your ECU, spray pattern still sucks. Your not going make 350bhp N/A. Get something that suits 250bhp. I cant remember how to calculate it
 
I was thinking about this, and some stuff came up to my mind.

Haribo, you should be experiencing a lot of backfire due to the overly large injectors. Have you seen how fuel is sprayed out from your injectors? It's supposed to be very fine mist so it can mix with oxygen particles to create an efficient combustion. And you know that the only way its going to make mist, is to have the correct sized injectors to suit your HP goals. This also effects your ECU. Your ECU is programmed to spray out x amount of fuel, but your injectors isn't doing its job properly.

Just imagine if your injectors are shooting streams of fuel instead of mist. The fuel would have direct contact to your pistons before your spark plugs could even even ignite the air/fuel mixture, and or worse, detonate.

Who gives a **** if your spinning 9000rpm when your only making 200-250bhp, RPM has no relavent factor in overfuelling, and if your spinning 9000rpm, then you better hope your fuel is sprayed out in the correct manner to create an efficient combustion, just like any stock engines.

I recommend (250/4) 60-65bhp injectors to suit your TODA B cams, because the MAX HP you going to make with that setup won't exceed 250bhp.

Also, using the injectors to its 100% potential is dangerous, as it will damage the tips of the injectors, and later flood your combustion chamber. I've heard 80% MAX is the safest and reliable zone. 90% is pushing it, but your getting better mist spray patterns.

Even if its turbo or N/A, or whether your spinning 9000rpm or 5000rpm MAX, and your peak HP is 250bhp. They should all be using 60-65bhp injectors. Your ECU can only tune to the physical limiting factors.
 
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