S/C boost control using the throttle?

FlashPro questions & answers specific to the 2006-2009 (US, UK, Asia) S2000
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Beechx1
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S/C boost control using the throttle?

Post by Beechx1 » Thu Apr 02, 2015 7:01 am

For a supercharged car, can the FlashPro be programed to limit MAP using the electronic throttle body? If so, how?

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Hondata
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Re: S/C boost control using the throttle?

Post by Hondata » Thu Apr 02, 2015 8:07 am

Using the throttle to control boost does not work very well - you have to close the throttle almost completely to reduce power.
With superchargers people have had some success using the regular boost control output to control the bypass valve on the supercharger. Sorry, I have no links, but a search should help you.
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Re: S/C boost control using the throttle?

Post by R-12914 » Sun Apr 05, 2015 1:42 am

On superchargers the boost pressure increases linearly with engine speed!

You can limit the maximum rpms (rev limiter) or the maximum throttle opening (throttle opening) to reduce the peak boost of the supercharger.
But this will not work as "boost by gear", but it is in every gear identical!

What supercharger do you have?

Hondata, not each one of supercharger configuration has a bypass!
2008 Honda Civic TypeR FN2
Rotrex C30-94 supercharged with relocated IAT
Powered by ASNU 092/FP330E fuel pump & ASNU 090/750cc fuel injectors
------------------------
ECU: 37820-RSP-E03
Flashpro: FP-SI-INT-21153
Software: 3.2.6.0
Firmware: 156

Beechx1
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Joined: Sun Mar 29, 2015 8:31 pm

Re: S/C boost control using the throttle?

Post by Beechx1 » Tue Apr 14, 2015 6:30 am

I have the new Kraftwerks supercharger kit with the 38-91 Rotrex compressor. This kit has the ability to produce about 15 PSI of boost. I will be tuning for 91 octane pump gas.

It seems to me that 15 PSI on a stock F22C engine is too much for 91 octane. I am trying to figure out ways to limit the to about 11-12 PSI.

I like the higher boost levels that this setup provides at mid RPM levels and therefore don't want to change the pulley to a larger one.

I have seen people use a restrictor plate in the inlet in front of the SC, a restrictor in front of the intake manifold and a waste gate in front of the intake manifold. I was hoping that the throttle plate of the DBW system could be used to limit boost by partially closing - just like backing off of the throttle a bit.

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