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Home > Technical Chat > supercharged dizzy with vacuum or not ?.

Supercharger

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Solihull/Birmingham

10th Jan, 2011 at 02:05:50pm

Quick question before I buy a new dizzy for my suck through supercharger project. Is vacuum or non vacuum best ?. I'm getting differing info from companies I call. So would like to call on people who have tried and tested to see what they think. I'm going to go for a 123 dizzy, as sold by mini spares, so I have lots of adjustable advance curves to play with.

John

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Mongo

Barnsley, South Flatcapshire

10th Jan, 2011 at 02:08:12pm

If you are going to use the 123 dizzy get the one that does retard on boost.

However a cheaper and infinately more flexible option is to go for megajolt.

Have a search on this forum about it.

If something is worth doing, it's worth doing half of.

wil_h

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Betwix Harrogate and York

10th Jan, 2011 at 02:23:28pm

And if it has retard on boost then it MUST have a vac/boost diaphram.

IMO no point having a 123 dizzy without a vac diaphram (infact any dizzy without one) it's the only way it can adjust depending on load.

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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

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I'm mainly concerned about swirl in the runners caused by the tangential entry.


BENROSS

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10th Jan, 2011 at 02:24:14pm

magajolt, you will never go back

gr4h4m

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Chester

10th Jan, 2011 at 02:42:43pm

from experience buy Mega Jolt now, you will only buy it in the future...

For a super charger setup the SC wheel is probably your best off the shelf option.


I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


johnnysti

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Swindon

10th Jan, 2011 at 04:26:32pm

Yep. Megajolt it!

feature=mhum

Supercharger

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Solihull/Birmingham

10th Jan, 2011 at 09:02:20pm


Thanks for the response. With Megajolt in mind, I don't suppose you know if there is any issue with the trigger wheel working/fitting up with a jonspeed (its the only jonspeed part I've used) bottom pulley. And if there is any clearance issues between it & the bottom rad/engine mount bracket. Also, ideally if I do go megajolt, as it looks pretty good after a quick search on turbo minis. Is this kit ( http://cgi.ebay.co.uk/Complete-Megajolt-ig...=item33639734b7 ) good value for money?. As I'd ideally like to just buy a kit, rather than piece it all together. Although it says complete, I can see that it does not include a dizzy blank. Is there anything else you think that its missing, or would be a good idea to use as well?.

On 10th Jan, 2011 BENROSS said:
magajolt, you will never go back

gr4h4m

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Chester

10th Jan, 2011 at 09:25:44pm

some VAC hose? and a way of mounting the box

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


lockfast

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Aberdeen

10th Jan, 2011 at 11:53:20pm

The Jonspeed pulley can be used with a triggerwheel kit from specialist components without any problems

apbellamy

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Rotherham, South Yorkshire

11th Jan, 2011 at 08:06:19am

That kit is a bit cheaper if you buy direct from their site rather than ebay

http://trigger-wheels.com/store/contents/en-uk/d33.html

Judging by the pic's, the pip/saw lines etc are not sheilded cable on the loom so you would need to sort that.

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

Ben H

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Melton Mowbray, Pie Country

11th Jan, 2011 at 08:25:39am


On 11th Jan, 2011 apbellamy said:
Judging by the pic's, the pip/saw lines etc are not sheilded cable on the loom so you would need to sort that.


Although desirable to have them shielded it is not essential. I have run mine for years without with no problem. The VR sensor too, but a proper install should have shielded cables.

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Supercharger

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Solihull/Birmingham

11th Jan, 2011 at 08:38:22pm


Hi thanks for the response. I think I will give trigger wheels a call and enquire if their wheel will work with a jonspeed pulley as well.

On 10th Jan, 2011 lockfast said:
The Jonspeed pulley can be used with a triggerwheel kit from specialist components without any problems
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