B21FT K-Jet

[CBM]

Maby a dumb guestion, but here goes
Will a set off 4 Bosch Fuel Injectors 0 437 502 047 fit on at non modified B21FT head

Thanks in advance

 

[dl242gt]

OK I looked them up on FCP Euro and those are the gold Mercedes injectors. As far as I know they fit just fine. However, the caveat I remember is they have a higher opening pressure. So you should be adjusting the overall system pressure a bit higher on your system. On a stock engine it may work ok. They are on sale for a great price at FCP Euro.

 

[CBM]

Thanks for the reply.
I plan to replace my fuel-distrubutor with this one "Bosch 0 438 100 027" from Porsche for a little power opgrade project, in the garage over the winther here in Denmark.

 

[Murploid1]

Thanks for the reply.
I plan to replace my fuel-distrubutor with this one "Bosch 0 438 100 027" from Porsche for a little power opgrade project, in the garage over the winther here in Denmark.

Hey there! Quick question regarding the fuel distributor upgrade...

You are looking for more fuel from your Kjet system I assume?

I guess it depends on power goals but I have always felt that the restrictions were more with spark and timing than fuel when it came to Kjet.

I run a standard fuel distributor (shimmed for more pressure), injectors + water meth - seems to be more than enough fuel..

 

[CBM]

Just remember that when you have more pressure with K-jet, you have less fuel coming in to your injectors.
And when you have less pressure with K-Jet, you have more fuel coming in to your injectors.

 

[dl242gt]

That is only with regards to the control pressure. Higher system pressure will flow more fuel to the injectors for a given air flow sensor position.

From what I've seen over the years. If you want a performance setup. You change to a downdraft airflow sensor and like the Group A cars there is some type of pressure regulator connected to the control pressure port on the fuel distributor. I think it's a decreasing rate fuel pressure regulator so when they go full throttle it's maximum low control pressure. I think Porsche uses it on their 924 CS turbo.