Planning on upgrading the turbo on my stock volvo 1.7l engine, I think the first thing I need to do is to upgrade the injectors as it looks like it's already on the limit. But to be sure I need some advise here.
I've got a 4-cyl 1.7litre 8v MPI engine, turbocharged (16,2 PSI max boost). Specs (chiptuner) say the engine should have 165 bhp output on the crank.
The fuel pressure is 51.45 PSI, injectors are rated 18.29 lb/hr at 43.5 PSI. So flowrate at 51,45 PSI would be
18.29*SQRT(51.45/43.5)= 19.9 lb/hr.
At 100% duty cylce, the BSFC would be: (19.9*4)/165= 0.48 But I don't think the duty cycle will be 100% so the BSFC will be lower. Generally they say BSFC would be higher towards 0.55 for turbocharged engines?
Is this a reasonable value for BSFC?
with BSFC of 0,55 the max HP at 100% duty cylce woul be 145 HP.
The AFR is around 12.5, and it is a pretty old design engine (1990).
From what I understand is that the fuel pressure regulator will keep the pressure difference over the injector constant, so a constant flowrate of the injector can be assumed, correct?
Any help is much appreciated.
Wout
Fuel pressure and flow rate, high duty cycle?
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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Gixfighter
- MegaSquirt Newbie
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Fuel pressure and flow rate, high duty cycle?
Trying to set up my first MS-II on a Volvo 480 Turbo engine
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Bernard Fife
- Master Squirter
- Posts: 475
- Joined: Thu Oct 29, 2009 12:54 pm
Re: Fuel pressure and flow rate, high duty cycle?
Gf,
At a glance, all you calculations and values look reasonable to me.
Lance.
At a glance, all you calculations and values look reasonable to me.
Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw