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Post by enginewhisperer on Jan 9, 2022 15:10:20 GMT -5
I just based my setup on the published specs, and two 044s give a decent amount of safety margin. I haven't seen the pressure drop under full load which is good!
The plan is to change the dual 044 setup out for a single Ti / Walbro "535" (F90000295) pump to simplify things.
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Post by enginewhisperer on Jan 5, 2022 22:52:53 GMT -5
my dual genuine 044 pumps in the race car pull around 12.5 amps each at ~60psi and 13-14v
With most motors the rpm is limited by the voltage, so they'll pull more current as you increase pressure, but the flow rate will drop. Depending on the internal leakage in the pump stage, they might need a lot of rpm just to maintain pressure, so the effect of low voltage on flow rate at full pressure might be pretty severe.
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Post by enginewhisperer on Jan 5, 2022 14:54:22 GMT -5
those manifolds with the banjo style fittings into the pumps might be restricting flow a bit too.
Most fuel pump ratings are at 13.8 or 14v too, so running straight from a battery will always be a bit limited.
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Post by enginewhisperer on Nov 23, 2021 19:22:13 GMT -5
Today I fitted a 16mm ID suction line between pump inlet and fuel tank to remove all restrictions ...................the pump now "sings" continuosly :-) The 044 was apparently designed to be fed from a low pressure "lift pump", so they are pretty sensitive to any restrictions on the inlet side. Hopefully it does the job with the bigger pipe
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Post by enginewhisperer on Jun 20, 2021 6:07:47 GMT -5
that's a pretty smooth run for a first turbine! Ideally I'd switch to some higher temp rated hoses for the oil system so you don't have to worry about them failing when you do longer runs. I have used push lock hydraulic hose with good success, but hard lines for the areas close to the hot parts can be a good idea. The basic laser tachometers you can get on ebay work ok if you can paint the compressor nut matt black and shiny white, but it's always hard to get a reliable pickup. I have generally just used the comp outlet pressure and stayed below 30psi or so on a smaller turbo. If your turbine intake temps are ok and it doesn't surge, the turbos are pretty hard to kill
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Post by enginewhisperer on Jun 2, 2021 15:44:23 GMT -5
There are many laser shops, but I think John's allergic to CNC John - I also have a CNC plasma cutter which makes short work of this type of thing (but leaves it messy enough so there's some manual work left to do
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Post by enginewhisperer on Apr 28, 2021 15:56:54 GMT -5
at least you noticed it before shipping!
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Post by enginewhisperer on Mar 25, 2021 16:56:23 GMT -5
I was there helping Smithy with the kart at Newcastle in 2016 I probably have a suitable turbo or two kicking around, and I'm on the Central Coast. If you just want to make something work, I have a small turbo which I've had working as a turbine engine before. I also have a couple of bigger truck turbos.
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Post by enginewhisperer on Feb 28, 2021 4:37:29 GMT -5
I now have a CNC milling machine and a few other useful tools so should be able to help out with some prototype parts for this
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Post by enginewhisperer on Nov 5, 2020 19:19:25 GMT -5
yeah I think the ideal setup would be something using an easily available wheel that also happens to be sized correctly for a gas generator built with another easily obtainable set of wheels.
Probably easier said than done!
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Post by enginewhisperer on Oct 19, 2020 22:20:05 GMT -5
yep, the main problem is the rusty driver now! Funnily enough, I started the day on low boost (which I've never tried before) and was over the track noise limit. The exhaust has already been designed to minimise noise, especially at that track - so the only option was to go back to high boost No problems then with the wastegate being held closed a bit more! You can see the boost creep up a bit as I go - which is the closed loop boost control slowly bringing it up to the target value. The base wastegate settings have the boost a bit low because of the ~700m elevation dropping the ambient pressure.
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Post by enginewhisperer on Oct 19, 2020 16:49:44 GMT -5
I got back out to the track last week, and am now the fastest Nissan "S chassis" at Wakefield Painfully close to a sub minute lap! If I had backed off slightly later it would have just got there. Unfortunately it was right at the end of the day and I couldn't go for another run. There's a lot more time left in it - mainly in braking. I'm not really right at the cornering limit yet either. Looking at data from a few laps, I could have done a low to mid 59 if I put together a few of the best sectors, so a 58 would be possible I think. youtu.be/Nvk6rfrCiss
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Post by enginewhisperer on Jul 9, 2020 20:20:54 GMT -5
I always spend more time sitting and thinking rather than doing - but it's certainly a lot cheaper (especially if the thinking works and you don't have to re-do things too many times)!
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Post by enginewhisperer on Jun 24, 2020 6:44:44 GMT -5
I'm not a fan of R888s, although they are pretty good in the wet I'm currently using Advan A050s, ex World Time Attack. I'll run some less ruined ones next time out! The engine is pretty basic (apart from being dry sump), with forged pistons, H beam rods, and some pretty mild cams with solid lifter conversion. It's making 360kw at the rear wheels, with the turbo flow basically maxed out from 5000rpm onwards. Probably works out close to 650hp at the crank. Drive train is a very old Jerico Nascar 4 speed dog box with a sequential shifter and a 5.5" Indy car clutch. I did the data overlay using RaceRender 3. It's pretty good but a bit of a pain getting the data synced to the video nicely.
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Post by enginewhisperer on Jun 23, 2020 4:49:51 GMT -5
After about 5 years building this car I finally got it out for a proper track test! I ran all sessions with no real issues other than being unable to get heat into the (very second hand) tyres so I lacked some grip and stability. Being very careful I managed a best lap of 1:04.57 which is about 2.5 seconds better than my previous best time in a different car. I'm hoping to get it under a minute at this track, which looks to be very doable and would make it the fastest Nissan "S Chassis" Compressor exducer is only 68mm www.youtube.com/watch?v=4vqY7gZEhnkwww.youtube.com/watch?v=am-h40ngADc
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