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2007 r1 injector cc
needforspeed - 14/12/11 at 10:14 PM

hi i need to know what cc the injectors are in my 4c8 r1 before i can start mapping please help!

needforspeed - 14/12/11 at 10:25 PM

this is what it says in the service book for part number and quantity denso 297500-1110/4
1110/4 quantity what??!!

Uphill Racer - 15/12/11 at 12:13 AM

A G Bell's calks should give ball park figures.

HP x 4.6/number of cylinders = cc per min x 100/injectors per cyl x inj duty cycle.

needforspeed - 15/12/11 at 09:37 PM

bump

needforspeed - 24/12/11 at 05:09 AM

just incase anyone out there requires the same information i had these flow tested and came out at 320cc/min @ 3 bar which should be good for 356bhp according to the emerald software! so happy days!

Uphill Racer - 24/12/11 at 11:20 PM

quote:
Originally posted by needforspeed
just incase anyone out there requires the same information i had these flow tested and came out at 320cc/min @ 3 bar which should be good for 356bhp according to the emerald software! so happy days!


I don't think Yamaha would have fitted such mismatched injectors.
320cc/min @ 3 bar with a 70% duty cycle are good for 195 bhp.
I would check your software calcs.

needforspeed - 25/12/11 at 08:03 AM

sorry typo it comes out at 256bhp at 45psi in car fuel pressure how are you working it out?

Paul Turner - 25/12/11 at 09:08 AM

330cc injectors are good for about 220 bhp at 95% using 3 bar fuel pressure, well they were in my Zetec.

Uphill Racer - 26/12/11 at 12:17 AM

quote:
Originally posted by needforspeed
sorry typo it comes out at 256bhp at 45psi in car fuel pressure how are you working it out?


As I posted, how are you working it out?

Uphill Racer - 26/12/11 at 12:25 AM

quote:
Originally posted by Paul Turner
330cc injectors are good for about 220 bhp at 95% using 3 bar fuel pressure, well they were in my Zetec.


220 bhp needs approximately 253cc/min @ 3 bar. At 80% 330cc injectors will flow 264cc/min.
If you use your car in anger pushing injectors past this value could destroy your engine.

needforspeed - 26/12/11 at 08:59 AM

ok thanks appreciate your replys the engine made 203 previously and i think il struggle to find any injectors to replace them directly so if the injectors are nearly maxing out il have to fit 4 more :-/