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Post by Debs on Jan 17, 2007 2:34:21 GMT
Hmmm.
Well the new DTA ecu is on order, as is the new Progressive Nos Controller (WON 'Max Extreme').
This will allow me to run a dedicated map that retards the ignition when the Nos flows. - Yes it means bigger shots of Nos! ;D
After consultation with WON (and some more testing) it appears that my 'hesitation' at 6000 rpm in 4th gear on a 75 shot was not in fact detonation, but loss of Nos pressure leading to over fuelling (I don't have a bottle heater to maintain bottle pressure). Ie the Nos flow was such that, by the time I got into 4th gear the pressure (on a cold day) had dropped sufficiently to affect my Fuel/Air ratio. The evidence is that the car ran to the red line in the first 3 gears and was fine in 4th up to 6000 rpm before getting the hesitation. This is further evidenced by the fact that a shift to 5th at the hesitation point in 4th allowed normal running for several seconds.
Sooooooooooo..........
Aside from the fact I am up to my armpits building an MG Midget circuit racer for the MGCC Midget Challenge, when I get the new controller and bottle heater, I will be re-trialing the 75 shot jets.
Watch this space.............
Jon, Perry and I are planning on doing the 'Saturday Night Special' (ie. racing Sat and Sun) on the 17 Feb.
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Post by Jonathan Tully on Jan 24, 2007 0:35:43 GMT
;DSounds good Debs ;D It would be intersting to see the DTA ECU and all the other gizmos. I am sure that either my MEMS or GIU is going up the spout. I keep getting an electrical FUBAR (super) safe mode, one day which can clear itself the next . I took it into the workshop last week and the thought is that part of the loom is going. It made sense at the time but after it's behaviour this week I am not so sure. Electrics have gone bonkers with the house as well. Now starting to think that it is the weather - LOL!! I have just got to try and establish a pattern, as the fault codes were not much help. Hey ho! Cheers Jon P.S. Anyone else up for a trip to the strip on the Saturday?
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Post by Jonathan Tully on Jan 24, 2007 0:41:35 GMT
Debs,
Silly question ;D Will the bottle heater maintain a constant optimum temperature - or is it something that you either have switched on or off?
Cheers
Jon
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Dave Kerley
Been there, done that!
Straightened Pure Gold
Posts: 382
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Post by Dave Kerley on Jan 24, 2007 12:48:35 GMT
Hi Jon,
Saw Slinky at the MGOC workshop, along with a lot of chin scratching, head shaking and head banging. Fortunately in between these activities they were able to service PG.
Should have been a painless experience - but having a gearbox bearing changed and discovering two rear tyres with as much tread as a 1970's F1 tyre, the bill rapidly rose!
Did explain to Trish, that there was one positive. Having fitted the K&N last year, I was able to save on the cost of a replacement OE air filter - a saving of at least £5. She just smiled and shook her head muttering something about spending more on the car than on her (which I find rediculous given the £50k she has spent on the house in the last year)
Hope SLF is up and running for the summer season.
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Post by Jonathan Tully on Jan 25, 2007 23:07:58 GMT
Having fitted the K&N last year, I was able to save on the cost of a replacement OE air filter - a saving of at least £5. Creative accounting? I like it ;D Hope SLF is up and running for the summer season. I could do with her back in running order before the summer - here's hoping. Saw Slinky at the MGOC workshop, along with a lot of chin scratching, head shaking and head banging. She is going in on Monday for some more chin scratching - LOL ;D I had some of the interior off this afternoon to try and find offending problem - but no joy. Found a stray bit of electric cable between the expansion and oil filler, that was seperated from the loom, this evening - but it didn't look damaged. Can't see how it would be connected to the GIU though. I will have to have a look in daylight if I get home from work early enough tomorrow to see if I can suss out what it is. Well at least it brings the 480 into action for a few miles - if the road speed/odomoter sensor worked that is. Cheers Jon
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Post by Debs on Jan 30, 2007 2:45:44 GMT
Jon,
The Bottle Heater uses heat to maintain a constant bottle pressure[/i], rather than temperature[/i] (via Boyle's Law - Pressure x Volume / Temperature = Constant).
Optimum Nos pressure is of the order of 900 - 1000 psi for correct air/fuel ratio based on the static jetting. Thus, if the bottle temperature falls (eg a cold day) then so does the Nos pressure, and hence the A/F ratio goes awry (too rich because Nos pressure drops but fuel pressure remains constant).
Additionally, with high Nos flow, ie larger shots, it is the gaseous Nos in the bottle as pushes the liquid Nos to the injector. As this flow continues, more liquid Nos converts to gaseous Nos in the bottle (maintaining equilibrium). This causes the bottle temperature to drop further (due to Latent Heat of Vapourisation) thus exacerbating the problem.
The Bottle Heater is basically an electric heater blanket wrapped around the bottle. However it is connected into the Nos Controller via a Bottle Pressure Sensor. Thus, the Controller 'knows' the bottle pressure and will cycle the bottle heater to maintain the pressure at the optimum setting.
With respect to the Feb 17 meet at the 'Pod - it is now unlikely that I will be going. Firstly because I has been so busy building the Racing MG Midget that I has had no real time to work on Blue Thunder. Secondly, because I am unlikely to have the new Nos Controller by then (and I see no point racing on my 2006 settings on a cold track), and thirdly, because it is unlikely Perry will be out since he lunched his differential last week.
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Post by Jonathan Tully on Feb 1, 2007 22:12:21 GMT
Hi Debs, Thanks for the explanation - really good - I can almost picture it now . Sorry to hear about Perry, I hope everything is all up and running again soon. How goes it with the Midget? Are you close to finishing it as yet? Cheers Jon
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Post by Debs on Feb 2, 2007 3:10:50 GMT
Its amazing how much I has learnt about Nos in the past 6 months, in terms of using Nos for racing.
There is a world of difference between using Nos on the street (and pretending you are part of 'The Fast and the Furious') and using it on the Strip.
As an example, to the average person, 1/10th of a second seems like nothing! To a Drag Racer it can be a major achievement (it's the equivalent of a second per lap for a circuit racer).
With the new system I will have an HUGE[/i] learning curve because of all the variables I can now program.
For eg, I can program in minimum and maximum RPM for Nos flow, in each gear. Indeed I can program every millisecond of Nos flow.
Not only that, but I will be able to tie into the wheel speed sensors and tailor the Nos flow to ensure no wheelspin (ie wheels break traction and the Nos is cut back).
Combined with the Quaife torque biasing LSD now on order, I should be able to get into the 13s on the jetting I has now.
Jon, the Midget program has now finished week 10 from being a sound and tidy (if tired) 1974 round wheel arch car. In actuality only about 4 weeks labour has so far been involved to take it from a road car to a bare shell to a rolling shell (with trick front and rear suspension). ATM the bottleneck is getting it into paint. From there it is merely a case of plumbing, wiring, and final assembly.
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Post by Debs on Feb 17, 2007 3:19:59 GMT
I picked up my new Max Extreme Nos Controller, bottle heater, and gauge, as well as a bunch of jets, today (as usual customer service at WON was exemplary), so interesting times are ahead for this season. I have a funny feeling that my learning curve just went vertical!
DTA ECU is still on order but I have sourced a Quaife LSD and an AP Racing clutch assembly.
Anyone want to help me drop the 'box out?!
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Post by andrew on Feb 17, 2007 12:09:27 GMT
My workshop charged me for 16 hours to fit the Quaife Diff, so if you can get good help you will save a packet. The whole rear sub frame with every thing attached was dropped and as I have air/cond part of the hours were in the disconecting and re fitting plus gasing so I can stay cool in our 40 degree heat.
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Post by Debs on Feb 28, 2007 2:36:27 GMT
In the village here there is a corner shop combined with (what was) a garage and MOT Station. The whole lot is owned by an husband and wife team. The husband has just retired, so ATM the garage is not being used. However, it has a 4 post lift so I am in negotiation with them to be able to use the facility to drop my engine out there since I have no qualms about fitting the Quaife LSD and the AP Racing Clutch myself as, over the last 25 years, I've built more race engines than I care to think about! The nice thing is that this garage / workshop is about 500 yds from my front door. I've just discovered that there is a K Series cylinder head guru local to me too: www.sabre-heads.co.uk/1.htmlOh dear, looks like we just got radical! My Bank Manager is going to hate me! ;D
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David
Learning the ropes
Gone! But not forgotten!
Posts: 48
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Post by David on Mar 2, 2007 0:00:17 GMT
Hi Debs Quite happy to be a 'spanner boy' if you need a hand. No expert on MGs 'cos as you know only just graduated from L@@d R**ers, but do know one end of a spanner from the other . Be great for me to learn more about these little gems too! Cheers David ;D
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Post by adrianvvc on Mar 13, 2007 12:43:08 GMT
Thanks Debs, for the ride around Silverstone. Richard Stone has put a photo on the South Midlands website. We will be coming to watch you at Santa Pod. Keep putting down the rubber ! cheers, Adrian
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Post by Debs on May 28, 2007 12:53:03 GMT
The 2007 Wizard of NOS National Drag Race event will be held on the Sunday 17th June at York Raceway. www.york-raceway.co.uk/The WON team will be there helping with car set-ups, etc. I intend to try and make my first sub 14 second pass there in Blue Thunder.
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Post by Jonathan Tully on May 29, 2007 19:52:31 GMT
;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
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