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megasquirt a turbo 6 cylinder honda cbx

 
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antman



Joined: 01 Mar 2009
Posts: 3

PostPosted: Sun Mar 01, 2009 11:17 pm    Post subject: megasquirt a turbo 6 cylinder honda cbx Reply with quote

Hi, I have a turbo charged single carb draw through honda cbx bike, it is a 6 cylinder in line and has a keihin carb feeding it fuel. The problem I have is that the fueling a turbo engine with a carb is out dated, un economical and I really want to go EFI (Mega squirt of course). I thought of a few options that might work and hope there some experienced people out there who could guide me.
Option 1 was to replace the carb with a throttle body incorporating an injector or 2 before the turbo.
Option 2 to replace the carb with a throttle body and fit 1 injector in each of the 6 runners/ inlet port of each cylinder.
Option 3 would be to fit 6 individual throttle bodies/injectors from a suzuki GSXR 600, this I know is a tried and tested conversion but is the most expensive option.
I would like to know if option 1 or 2 work, I would appeciate any feed back on this.
Thanks
Tony
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Pantera EFI



Joined: 12 Feb 2005
Posts: 1718
Location: So. California

PostPosted: Mon Mar 02, 2009 10:45 am    Post subject: Low cost EFI Reply with quote

Option #2 would be my choice.
Get some items from the "scrap yard".
You can find the fuel injectors, sensors, pumps, coils, in a yard.

Spend the money you save on the best EMS you can afford.

Lance
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Buzzard



Joined: 14 Dec 2004
Posts: 221

PostPosted: Mon Mar 02, 2009 11:22 am    Post subject: Reply with quote

Its option 2 or 3. 2 if you stay with your current turbo, 3 if you plan to upgrade to a late model turbo without carbon compressor seal.

Buy the best ecu you can afford - it's good advise.

Chris
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antman



Joined: 01 Mar 2009
Posts: 3

PostPosted: Mon Mar 02, 2009 9:08 pm    Post subject: Reply with quote

Thanks guys, others recon that in option 2 the idle will be effected by the other cylinders robbing fueling from each other as the runners or inlet tracts are short (about 3 inches) as well as poor fueling at higher rpms.
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Pantera EFI



Joined: 12 Feb 2005
Posts: 1718
Location: So. California

PostPosted: Tue Mar 03, 2009 10:17 am    Post subject: Fuel Robbers Reply with quote

Your "others recon" friends (MS) may not provide the best advice.

The case WILL IMPROVE when EFI is fitted in the stead of a "carB".

The second part of their (MS) advise "high RPM" is even more incorrect.

As the air flow increases you will find that when the fuel is injected into the port the air flow will become more even as the boost is increased.

Your statement about costs ruled out #3, I agree that ITB's with a correctly designed plenum will work best.

Lance
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Matt Cramer



Joined: 25 Sep 2007
Posts: 395

PostPosted: Tue Mar 03, 2009 1:10 pm    Post subject: Reply with quote

I'd also go with option 2 in this case. I've never seen a port injected engine develop charge stealing issues unless it had siamesed ports, which a CBX doesn't.
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antman



Joined: 01 Mar 2009
Posts: 3

PostPosted: Sun Mar 08, 2009 10:00 pm    Post subject: Reply with quote

Thanks guys, I will go option 2 and will have to make up a 60-2 type wheel with pick up and am sure this will work. Thanks....will let you know how it pans out.
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Pantera EFI



Joined: 12 Feb 2005
Posts: 1718
Location: So. California

PostPosted: Mon Mar 09, 2009 9:37 am    Post subject: MS=36-1 Reply with quote

I thought that MS could only use the Long 36-1 target wheel ?

I do have high RPM (36x) "Cosworth" wheels of 3" in diameter.

I would change to the "36" target if the normal RPM will be over 12,000.

Lance
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Matt Cramer



Joined: 25 Sep 2007
Posts: 395

PostPosted: Mon Mar 09, 2009 11:25 am    Post subject: Re: MS=36-1 Reply with quote

Pantera EFI wrote:
I thought that MS could only use the Long 36-1 target wheel ?


That's the most common, but it works with quite a few other wheels as well.

Quote:
I would change to the "36" target if the normal RPM will be over 12,000.

Lance


So would I, particularly on an MS1. The MS2 has the processor speed to handle a 60-2 trigger wheel at higher speeds but I'd still go with a lower tooth count.
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