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64 Posts Member #: 2244 Advanced Member mulbarton, norwich nr14 8gs |
31st Jan, 2009 at 02:32:43pm
hello all.
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
31st Jan, 2009 at 04:40:41pm
high vacuum at ldle is a good thing.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
31st Jan, 2009 at 06:23:05pm
faulty dump valve the diaphram may have gone ?
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 4559 Posts Member #: 786 Post Whore Bermingum |
31st Jan, 2009 at 06:53:29pm
Hi,
VEMs Authorised Installer / Re-seller. K head kits now available!
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64 Posts Member #: 2244 Advanced Member mulbarton, norwich nr14 8gs |
2nd Feb, 2009 at 01:00:45pm
it is a diaphram d/v. i have had it apart and there doesnt seem to be any thing wrong with it. i took it for a drive this mnorning and it was working it first and second gear but not in third or forth? |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
2nd Feb, 2009 at 01:30:13pm
I don't understand. The vacuum is needed to open the DV. So at idle it should be open.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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 514 Posts Member #: 2104 Post Whore Essex - UK |
2nd Feb, 2009 at 03:02:38pm
that is very strange that it would work in first and second but not the others
"Tuning should be a compromise between what is possible and what is necessary"
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
2nd Feb, 2009 at 07:01:44pm
On 2nd Feb, 2009 wil_h said:
I don't understand. The vacuum is needed to open the DV. So at idle it should be open. If you rev the engine it should start to close, but it won't close fully until there is some boost, and for this you wil need to be driving. at idle it would be closedunless the plenum pressure exceded the spring pressure minus the vacuum. so if the spring pressure was equal to 100kpaG and the vacuum was 30kpaA the plenum pressure would have to excede 30kpaG to open the valve. At full throttle full boost there is almost boost pressure in the manifold and on top of the diaphragm and boost pressure below the diaphragm, almost cancelling out leaving the spring pressure holding the valve closed. Suddenly close the throttle from full boost full throttle, plenum pressure rises, manifold pressure falls into deep vacuum and the valve opens quickly to dump the excess plenum pressure. Again it depends how the valve has been installed as you can use the DV as a boost control or a Dump On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
2nd Feb, 2009 at 07:37:22pm
Well mine are always open at idle. Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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280 Posts Member #: 4340 Senior Member sideways, Birmingham |
2nd Feb, 2009 at 08:58:10pm
er, just out of interest should i be geting a dumpvalve whooosh from a standard dumpvalve? sorry to hijack
On 15th Dec, 2009 fastcarl said:
sell the lot to me for £70 pounds and i'll let you stand on the outside edge and look on my inner circle of closest frinds, lol carl FOR EVERY WELL THOUGHT OUT AND WELL EXECUTED PRICISION JOB EVER CONCIEVED, YOU CAN GUARANTEE THAT SOMEWHERE IN WALSALL OR THE BLACK COUNTRY THERE WILL BE A BLOKE TRYING TO ACHIVE THE SAME BY MEANS OF "ITIN IT WI LUMP AMAR" |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
2nd Feb, 2009 at 09:41:11pm
On 2nd Feb, 2009 wil_h said:
Well mine are always open at idle. I supose it depends what the plenum pressure is? On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
2nd Feb, 2009 at 09:44:04pm
http://www.balancemotorsport.co.uk/main.as...ages=dumpvalves On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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