View Single Post
Old February 16th, 2020, 12:14 PM   #4
DannoXYZ
ninjette.org certified postwhore
 
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Note that injector flows are rated at standard 3-bar pressure and 100℅ duty-cycle full flow. Pumps and injectors are easy to replace. Do not let that be deciding factor in anything. They are sized for your target power output at very end.

EAT-811 = 175cc/min @ 43psi
INP-288 = 200cc/min @ 43psi
INP-250 = 235cc/min @ 43psi

Select your power output first. Then do proper maths:




Reason maths is vitally important and critical in planning stages is it dictates your turbo sizing. Plot your numbers on compressor map and find appropriate turbo.



Reason every single 250 turbo project has failed and blown up is lack of proper maths. Just picking cheap VZ turbo without doing maths has resulted in selecting turbo that's way, way too big for application. VZ turbo has sweet-spot of 100-150bhp!!! No way are you gonna run 50-70psi boost to get it to flow in its efficiency island and not blow up engine! Less boost results in tremendous lag and compressor-surge which is impossible to tune an aftermarket standalone programmable EFI system for because it's operating off edge of 3D maps.

So... What's your power target and show your maths.
DannoXYZ is offline   Reply With Quote


1 out of 1 members found this post helpful.