Flexitune

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Volvo five cylinder

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Volvo five cylinder

Postby HansP » 29 Feb 2012, 23:06

Hi,

I have a Volvo S80 2001 with the S2 engine (B5244, 140bhp).

What kind of set up would you recommend for this car?

Will there ever be a module that can handle five cylinders on its own?


Best regards
Hans Persson
HansP
 
Posts: 2
Joined: 29 Feb 2012, 22:58

Re: Volvo five cylinder

Postby alex » 02 Mar 2012, 00:06

We do not have plans for a five cylinder version at the moment.

One solution is to use two Flexitune AutoX4 for 5 to 8 cylinder engines.
It is of course more expensive but works well.

We have several customers that have converted 5 cylinder engines with only one AutoX4 with good results. The basic idea is to connect the injector for cylinder 5 in parralell with cylinder 4.
alex
 
Posts: 18
Joined: 04 Jul 2011, 14:17

Re: Volvo five cylinder

Postby HansP » 02 Mar 2012, 09:06

Using only four channels for five injectors sound a bit odd to me.

Do you mean that the two signals from the ECU should be connected to one input on the AutoX4 and the two injectors to the same output?
Would they not get twice as much fuel then?

If you would connect two cylinders in parallel to only one output from the ECU, would not one cylinder get its fuel out of cycle then?
HansP
 
Posts: 2
Joined: 29 Feb 2012, 22:58

Re: Volvo five cylinder

Postby alex » 07 Mar 2012, 22:19

It's almost as you describe it: Both injectors are connected to Flexitune INJ4 and only one injector control signal (eg. Cyl 4) from the ECU is connected to ECU4 on Flexitune. This will result in a batch fire connection for cyl 4 and 5. It's also adviced to use a 200 ohms power resistor connected to the ECU to emulate the injector for the fifth cylinder (possible faul codes).

In practice the connection will work fine. Regarding injector fire sequence, it has marginal effect. For example the eraly Volvo five cylinder models has batch fire on all five injectors (completely non-sequential system).

Of course we recommend to use two Flexitune units but conidering the savings on using only one Flexitune the connection above might be considered.
alex
 
Posts: 18
Joined: 04 Jul 2011, 14:17


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