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August 19, 2019, 09:24:54 PM

A mucky one - racing rail.

This is a discussion for the topic A mucky one - racing rail. on the board Members Buggies.

Author Topic: A mucky one - racing rail.  (Read 29257 times)

this user is offline PhillipM

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Reply #120 on: January 30, 2019, 03:59:12 PM
Nearly all of this in single phase to be honest, as we had poor electric where were used to have the tin shed (it was basically just a cable ran down from someone's stable block which itself fed down from the house). The only thing is a new welder we just bought and the lift in the front are 3-phase but they aren't for the buggy.
One of them mucky ones. Sorry.


this user is offline PhillipM

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Reply #121 on: February 02, 2019, 04:20:30 AM
Well I spent two hours today fine tuning the idle fuelling and timing, and put the cold weather to good use to tune the cold tip-in settings (same as accelerator pump in a carb) - and got it blipping cleanly from cold with some beans. Also set up the camera to get some better video.

Then I spent 2 hours slithering home in the snow (it's only 10 miles) - including 30 minutes just getting up the 100m of farm track. I had to keep shoving my floor mats under the wheels, it was solid ice. I even put the car in drive at one point (tiptronic) and got out and pushed it as well :D

Then, when I got back, I downloaded the video to find....it's corrupted. I've got the first minute (cranking it over and tweaking the cold start) and the last minute (the engine ticking as it cools down 'cause it's off) and nothing in between  ;D
One of them mucky ones. Sorry.


this user is offline PhillipM

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Reply #122 on: March 25, 2019, 03:10:20 AM
Well, just as we thought we were sorted - the car ran fine when fired up - the intermittent starting reared it's head again, been tracking that down again over a couple of weekends - traced it down to what we thought was the alternator or the ballast, so I pulled the loom apart and added a larger ballast to the field coil, no difference, bought a new alternator - no difference. Take alternator off, starts fine.
Much head scratching.

Turns out the alternators we were getting from the local supplier (an electrical specialist, not just a factors) - were basically noisy as hell when they were trying to get to the right voltage at low rpms (i,e - startup only) - a cap in the line doesn't fix it, some shielding might but we've just sacked it off and got a different type of alternator instead, need to alter things to get that to fit properly again now, but after rigging it up today it's purring like a kitten. Need to retime it now though as not certain it was 100% before as it idles smoother now.

It never rains, it pours!

On the upside, I was rebuilding some other dampers* so I rebuilt/revalved the rears on ours to suit the new arms and bled them, so that's one more job off the list and ready to go - although I have just acquired some new go faster parts to machine and fit - I got told these were top secret so...there we go:



It's all very well getting shiny adjustable parts for your dampers but then you have to spend hours modelling the damned things - nearly there, housings next.
These are high and low speed compression adjusters, that hopefully with a bit of work on my side will be adaptable enough to use both on the small fronts and large rear dampers...hopefully.



One of them mucky ones. Sorry.


this user is offline snoopy

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Reply #123 on: March 25, 2019, 08:09:35 AM
A sign of the times modern alternators are not just simple charging devices they used to be because of the complexity of vehicles these days, annoying and frustrating but you got it sorted.


this user is offline PhillipM

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Reply #124 on: March 25, 2019, 11:06:10 AM
Yep, wasted quite a lot of time and effort just down to that  >:(

Even if you don't get an ECU controlled or smart charge alternator you can still fall foul of 'em!
 Anywya, done now, was a very happy chap yesterday,  I've already built 95% of the map so just need to head to a dyno for running in and fine tweaking.
One of them mucky ones. Sorry.


this user is offline fugglededumm

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Reply #125 on: March 25, 2019, 03:58:52 PM
Surprised you run an alternator at all when you race, unless it's in the dark. Parasitic loads and all that. 


this user is offline PhillipM

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Reply #126 on: March 25, 2019, 04:36:07 PM
50 amp load from the power steering, 30 amps for the cooling fans, 15amps for the fuel pump, 30 for the washers and wipers, 30 amps for the ECU, dash, coils, injectors, solonoids, running lights, etc - that's before you add 30/40 amps for a light pods if it's a dark race.

Soon adds up, you need a beefy alt to keep on top of it, even with some of it being intermittent.
One of them mucky ones. Sorry.


this user is offline fugglededumm

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Reply #127 on: March 25, 2019, 09:02:45 PM
I was thinking that the races were around half an hour, so with all of that lot on full time in the dark it's only 68Ah - Swap it out for the next race   


this user is offline PhillipM

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Reply #128 on: March 25, 2019, 09:16:16 PM
5-15 minutes per stage, 5-10 stages per day. Some events are 2 days...
One of them mucky ones. Sorry.


this user is offline fugglededumm

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Reply #129 on: March 25, 2019, 09:53:37 PM
Thata a big range - 25mins to 150 mins. But even worst case it sounds like you could do that with swapping 3 or 4 small batteries round  - charge up overnight if needed (from a big ole static battery in the van if no AC power) and during the day if you can. Depends on how much power the alternator takes if it's worth it.


this user is offline PhillipM

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Reply #130 on: March 25, 2019, 09:58:38 PM
Gets a bit tricky if you have to stop on stage though, or there's a delay while starting a stage and you're sat in a queue shunting - for the alt it's only 2bhp at most - better off running the alternator and a nice tiny 3kg battery instead of the usual 20kg lead-acid - power isn't an issue really any more with this engine, I deliberately limited this setup as we don't have enough traction for more (it will still be spinning the rear wheels at 100mph+ going by the sims) and I want to protect the gearbox - there's enough spare capacity in the intercooler, charger, etc, to wind it well north of 500bhp if the gearbox ever got some upgrades.

Shock canisters done - light and simple to make, and easy to swap fittings for the different hoses:



One of them mucky ones. Sorry.


this user is offline PhillipM

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Reply #131 on: March 25, 2019, 11:19:12 PM
And they adapt with just a few fittings and some internals changes to work with the smaller front shocks, sorted :D

One of them mucky ones. Sorry.


this user is offline snoopy

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Reply #132 on: March 26, 2019, 07:34:12 AM
some very nice work there.


this user is offline PhillipM

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Reply #133 on: March 28, 2019, 03:20:08 PM
Seems a shame to go back to the old front end when the new ones were finished mocked up and are mid fabrication for the actual ones, but screw it, back to the old we go - it can have an upgrade after the dyno instead...

One of them mucky ones. Sorry.


this user is offline PhillipM

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Reply #134 on: March 30, 2019, 09:10:45 PM
Thought I'd let you at least hear a couple of thousand revs:

https://youtu.be/EbZXmzDnYQQ

Throttle response is a little slow currently, but I think it's mainly down to the idle mapping running a bit lean - it stumbles a touch when you first touch the throttle from 1k.
I need to check my changes to the cold start settings I've been making today when she cools off enough, and then I can hopefully richen the idle area and lean the main map out a bit to perk it up.
Got the coils/injectors back up and running in sequential mode as I turned everything to dumb group fire when diagnosing, so timed in the cam trigger wheel and I've done a bit of work on the low-load transients so it picks up nice and cleanly everywhere bar around idle.

Need to get it to the dyno then to get it spot on - it's deliberately tuned on the rich side with a bit of timing pulled at the minute to protect it until then - but basically everything else is setup in the map ready to go.
I'm not sure it'll have any exhaust packing left by then though, it's covered the workshop in it...I got a bit more enthusiastic with the throttle later on as I got it a bit crisper
One of them mucky ones. Sorry.