450cc injectors ran by auto ecu (390s)

[1bad91tsi]

I know it will flow more fuel(450s where 390s should be) but what cc would it be equilivent to?
Would it flow 450cc?Or would it flow 510?

I know my logic is off but if 60cc difference between the 390 and 450 then a swap to 450 where it thinks its 390 would yeild 510 WTF,

 

[DontStartModdin]

You need a 5sp. ecu to run 450cc injectors in an automatic.

 

[steve]

Since your swapping parts what is the base fuel pressure going to be?
You need to know so you can compare the effective injector flow rates not the rate at an industry test value.

 

[Oblivion02]

There are a few other threads talking about injectors and such. Yes, you do need an M/T ECU to run the 450s, and you should probably consider getting a new fuel pump, maybe 190lph; Rewire it. You may also want to consider getting an AFPR, in case you want to eventually upgrade to even BIGGER injectors.

 

[Oblivion02]

You should also get a logger, just to make sure the car is getting enough Air/Fuel.

 

[91 Turbo Mitsu]

Okay I may be wrong on this one but I thought manual or auto ecu made no difference. The engine computers are the same right? You are talking about using turbo injectors (450cc) in place of 390's. Are you trying to use a non turbo ecu in place of a turbo one. I dont think this will work but I could be wrong. Is the car turboed. If it is and you are using 390's right now I would think it would be lacking fuel real bad. Just my .02

 

[rare1]

I have ran 450's in my auto car with the factory ecu.It runs the same as if it had the 390's in it.

 

[Oblivion02]

According to: http://www.dsmtuners.com/forums/fre...questions/277747-fuel-injector-questions.html

1G Turbo Injectors are 450 with M/T and 390 with A/T.

Some people have been able to run the 450s with no problems at all with the A/T ECU. However, some people have had problems, so I recommended the M/T ECU just as insurance.

 

[steve]

I'm still waiting for the OP to respond but I'll remind the rest that on a 1G manual car the stock injectors deliver about 411cc/min of fuel because of the lower base fuel pressure (36.3 psi). The ECU knows this just like the automatic ECU knows that it's using 390cc injectors at 42.7 psi base so that the effective size is SQRT (42.7/43.5) * 390 = 386.4cc/min

 

[1bad91tsi]

so what would the 450s be with 43 psi?

 

[steve]

so what would the 450s be with 43 psi?

Roughly 450cc since they are rated at 43.5 psi by their maker. At 43 psi they will be slightly smaller than what they were rated at.

 

[1bad91tsi]

so i just bought a 90 m/t ecu.I am going to swap the wires but should i leave the auto fpr or get a manual one?I have a safc and have some decent upgrades(typical 350 hp,b16g fmic,660s,so on)
I dont want to get a afpr if i can just use the one i have.

 

[redline2k6]

i ran the 450 cc injectors in my auto without a single problem, i was actually able to run a psi or 2 more without knock on the stock auto ecu i might add