If i use a high flow fuel pump rated at 195 liters per hour, can I use the stock injectors. I will only boost to a maximun of
1.0 kg/cm2.

What is the flow rate of the Stock fuel pump ?

Thanks for your help !

 

Getting the fuel to the injectors is one thing. Getting the injectors to then spray the required amount of fuel is another. At 14.22PSI you're asking for trouble. Running a safe fuel map at that boost level would require upgraded secondaries. The stock ones would be at 100% duty cycle which should be avoided.

Go with 1200cc secondaries and you'll be fine. Also flow-test your primaries while you're at it.

Good Luck!

Rob

 

SilverR2, Thanks for your reply.
Are you using 1200cc on the secondrys ? or could i use all four 850cc ?
What is a safe boost not to make the injectors go to 100% duty cycle ?
Please help !

 

Not Yet. I've got a ton of parts I need to order and install and they unfortunately are gonna have to wait until I get more money. I will be running the 1200cc's as secondaries however.

As far as I know going to a larger primary injector may cause a very rich mixture at/just slightly off idle. This can be tuned down of course but its almost a waste. The stock primaries are fine as long as they are operating correctly and within specs. You really need the extra fuel from mid-high rpm which can be obtained by simply going to the larger secondaries.

There has been alot of discussion on the 1200cc secondaries. Check the archives, I'm sure you'll find much more hands on info.

Now for the duty cycle ques. I run no more than 11PSI right now. It all depends on your mods and how your fuel map has been tuned. Mine is pretty rich right now up top so I still run the injectors up in the 90% and occasionally max them out. This of course should be avoided but I am still tuning and waiting for additional secondaries. I only drive the car like once every 2 weeks too. And even then on short trips.

Rob

 

Rob, thanks for all your help.