Jamesc
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| posted on 17/5/16 at 07:47 PM |
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IVA Fail Norwich
So straight to the point... I failed on 1 item which was the brake bias. I was given time to adjust it, but no matter where I moved the bias bar, it
made no difference, the rears were grabbing too much. The setup is Wilwood 4 pots front and sierra discs rear with 0.625 master cylinders on both.
Before I begin, can anyone suggest a solution? Incorrectly setup, worn out bar or replace the front master cylinder with a bigger one? Unfortunate
that this is something you cannot test at home!
Anyway, after being a little gutted (mainly at having to return to the test centre for one thing) I've realised that it's a very good fail
and should be easy enough to sort as the brake power and efficiency is there. I need to find the solution and get the re-test booked asap (will need
an hour slot apparently).
On a happier note, most of the things I was worried about were fine.. After some problems with the machine, the emissions went through first time
(Caterham sports cat, standard engine map) and the noise test came in at 91db! (Straight through silencer/cat in to standard zx12 silencer with a db
killer for good measure). Lights were not too far out after using the garage wall either.
Massive thanks to Ian from here for trailering my car and coming with me, hopefully yours will fly through soon. Dennis at Norwich test centre was
also a great help and made us feel very welcome and relaxed which was great. He explained most of the test and reasons behind them which made the
whole thing quite enjoyable!
James
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sdh2903
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| posted on 17/5/16 at 07:51 PM |
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I used a 0.625 on the front and a 0.7 cylinder on the rear with discs all round. Bias bar not far off central. Think that's a pretty standard
combination.
All in all not a bad result well done.
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Ben_Copeland
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| posted on 17/5/16 at 07:51 PM |
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Less pressure on the rear !
Change the rear cylinder, 0.625 is fine for fronts but too much for rear discs
Ben
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Z20LET Astra Turbo, into a Haynes
Roadster
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rusty nuts
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| posted on 17/5/16 at 07:54 PM |
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Replacing the front M/C with a larger one is likely to make things worse , replacing the rear with a larger one would reduce the pressure in the rear
brake circuit . I would try a 0.700" master cylinder .
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gremlin1234
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| posted on 17/5/16 at 07:54 PM |
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usual problem with bias bar is they are set up too close, so don't allow the bar to swing.
but as others have said, well done!
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CosKev3
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| posted on 17/5/16 at 08:10 PM |
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Nice and small fail,well done 
You can test the brake balance on axle stands if you've got someone decent that can help and press the brake pedal nice and slowly and hold the
pressure when told to!
Turn a front wheel by hand whilst your helper presses the brake pedal down slowly,once the front wheel cannot be turned tell them to hold the pedal
where it is.
Go to a rear wheel and you should still be able to turn it,then tell your helper to push the pedal down more and the rear wheel should lock up then
too.
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Jamesc
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| posted on 17/5/16 at 08:58 PM |
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OK thanks, nice tip on testing it out, I'll give it a go.
The only thing that made me think against changing the master cylinder was that I think these are the cylinders that came from Spire in the brake kit.
Either way, it sounds like the larger cylinder should have the desired effect.
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britishtrident
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| posted on 17/5/16 at 09:14 PM |
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Bigger bore cylinder on the rear also make sure the yokes on the bias bar have enough side clearance to work ie they are not hard up against the tube
that goes through the pedal
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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big-vee-twin
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| posted on 17/5/16 at 09:28 PM |
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I have same set up, but 0.7 for rears, passed recently.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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Irony
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| posted on 17/5/16 at 10:00 PM |
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Before you go and buy new parts make sure you have the bias bar setup correctly. Both myself and a friend had the two arms to close to the pivot
point so the bar itself couldn't swing. If you tried altering the bias and it made no difference then the bar itself isn't working
properly.
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Jamesc
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| posted on 18/5/16 at 07:45 PM |
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Thanks for all the advice, I think I may have sussed it and learnt a valuable lesson... Don't trust other peoples work! The bias bar was one of
very few parts I didn't check/rebuild when I bought it part built, but tonight I discovered the balance bar was in the wrong way meaning that
the bias was set to the rear. No wonder I ran out of adjustment.
Hopefully I'll be able to get someone to help me test it tomorrow evening and if all is good, ring the test centre on Friday. The front cylinder
certainly looks like it is moving a lot more than before. If all is not good, 0.700" master cylinder on the rear.
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rusty nuts
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| posted on 19/5/16 at 06:34 PM |
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At least you haven't got too far to go for the retest.
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Jamesc
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| posted on 20/5/16 at 12:26 PM |
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Not far to drive... Long wait though 22nd June 
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gremlin1234
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| posted on 20/5/16 at 01:23 PM |
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quote:
Originally posted by Jamesc
Not far to drive... Long wait though 22nd June
time to get the reg forms from dvla
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Jamesc
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| posted on 20/5/16 at 01:27 PM |
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quote:
Originally posted by gremlin1234
quote:
Originally posted by Jamesc
Not far to drive... Long wait though 22nd June
time to get the reg forms from dvla
I already have them as they came with the VIN ages ago.
Best I can hope for is a cancellation.
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Jamesc
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| posted on 22/6/16 at 04:39 PM |
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IVA PASSED!
It's been a long wait for the re-test, but it sailed through this time with balance bar assembled correctly...
Now just to pay the £472 insurance! 
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Ben_Copeland
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| posted on 22/6/16 at 04:57 PM |
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£472 is ridiculous.
Your either young or need to shop around
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
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Jamesc
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| posted on 22/6/16 at 05:04 PM |
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I'm 27. A lot of places won't insure drivers that haven't had a kit before unless they are over 30.
It was £265 until they realised it was a bec. But I agree, ridiculous!
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Irony
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| posted on 22/6/16 at 05:55 PM |
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Congrats!!!!! What was wrong with the brake bias?
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Jamesc
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| posted on 22/6/16 at 06:14 PM |
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Thanks mate! Er, well, er, the balance bar was put in the wrong way. Not originally assembled by me, but I should have checked really. Hindsight and
all.
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gremlin1234
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| posted on 22/6/16 at 06:34 PM |
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quote:
Originally posted by Jamesc
IVA PASSED!
well done, bit more paper work for registration, (and we hope the rain stops! ) then ENJOY!
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garyt
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| posted on 25/6/16 at 05:53 PM |
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congratulations on the pass just a short step to get registered and then enjoy
remember we are not mad just creatively insane !!!!!
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Jamesc
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| posted on 12/7/16 at 07:13 AM |
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So I posted the registration application (for a new plate) off on the 23rd June. I was on holiday last week and checked my e-mails/bank account to
find nothing.
However, I came home yesterday to find all the documents I sent and a V5 sitting on the floor. They were dated 6th July, so not 100% sure when they
came but decent turnaround in my opinion and no fuss about documents etc.
I'm now the owner of a 16 plate. Just need to wait for the rain to bugger off!
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adithorp
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| posted on 12/7/16 at 08:07 AM |
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Nice one!
Take it easy out there. These cars bite and the roads are greasy at the moment
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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