Gen-f free boost mod

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Interesting little mod to stop leaking boost: http://www.hsvforum.com.au/showthread.php?14334-Fr...

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Should be seeing as you can overdrive the supercharger safely. Just seals off the recirc valve properly when closed.

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Just had a look and reckon it could be done with a 10mm ring spanner in less than 5 minutes...

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I am going to the VXRO rolling road day and have enquired as to whether Rabbid would let me do this between two runs to see if there is a marked difference.

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BartW said:

I've not responded, but I'm watching this thread so keep us posted

Will do, rabbid is ok with it as long as I can do the change quickly as he is a bit time limited due to numbers. What do I care if a Corsa or two don't get on the rollers

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BartW said:

Hey, did you get a comparison dyno run in the end?

Not a successful run in the end. I managed to adjust the wrong way and ended up totally opening the valve. Have since done it properly and just by feel can tell it is improved. Can also now hear some of the supercharger whine

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Seeing as I got the dyno record for that dyno, not sure how accurate that 537 as a true value was tbh, just wanted comparisons really. Plus, by that point the car had been on the dyno for quite a while due to operator error so was probably fairly heat soaked. But yeah, the way I adjusted it opened the valve completely.

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BartW said:

Cool, so there might be me with a 10mm spanner tampering in the engine bay

Is easier with a socket with extension bar

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BartW said:

Ok, so we did it on both cars. On the white one it goes up to 60kpa and on mine goes up to 58kpa? This is me looking at the lower right hand side gauge on the centre console. It also felt slower than usual.

When modified correctly, should see about 65+kpa on the EDI. Can you make the Ely meet next week? Can check it for you if you want

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BartW said:

I don't have a pressure gauge on EDI, or do I?

Ely meet, where / when is it?

It is the one you are looking at.

Ely meet is a week on Saturday, thread is somewhere in HSV&M, will post in it to bring it to the top

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A thought just occurred to me. Are you using the EDI or the gauge in front of the gearstick? You should see at least 62kPa as that is the factory rated boost level (9psi). If you can get to Reading this weekend, I can have a look for you...

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It also took me a while to figure out those gauges! I could come over to yours on Saturday evening if needed.

It is quite fiddly when you don't know what you are doing, one wrong move and you end up opening the valve as I found out, but once you know what you are doing it is simple. If you can get over here, I do have somewhere close by where we can test it out with full bore launches. Peak boost comes fairly close to max RPM so you generally need a passenger to be your spotter. My wife saw the 67kpa for me on the motorway up to Derby.

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BartW said:

Thanks for the offer of coming to visit I will let you know, though. It would be great to meet over the weekend and chat about the experience so far. I am not sure what time I am going to finish my chores tomorrow, but I will send you a PM if there is prospect of meeting.

Thanks
Bart

You still got my number from the Ace Café meet?

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Just remembered am not free tomorrow evening. Going on an Otter walk in Oxford! Otters are so awesome!

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ARAF said:

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Otters are so awesome!

But their pockets are pretty wet.