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My long promised blog

New engine arrived the other week :D
A recent stay in hospital has kept me from updating much but there's much I haven't shared
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Here's a common misconception about seam welding for you, for whatever reason its popped up a couple of times this week. So thought I'd make a little post
Seam welding or Stitch welding is NOT one continious bead of welding, its a series of welds in sequence
Mine are 20mm with a 20mm gap in the pic above
The length and gap do have a different effect but I cant remember how so, different weld lengths and gaps can be used to make a flex in a certain & predictable way which is often where the bracing comes in
Why not one continuous bead? When the car flexes, and IT WILL do, the parts/panels have no where to flex so in turn snap instead, this applies to all sorts; chassis, axles and especially wishbones, the worst thing to do is put one continuous weld on a standard wishbone, they're 2 piece pressed steel sheets for a reason, if you want to stiffen them up, buy purpose made wishbones

Just a note for anyone prepping a track orientated car
 
Here's one of my latest investments
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Its ok for the money but it will be having modifications before it sees any use at all
First and most alarming to me is the jack is free to slide n move around, the plate it sits on isn't true either so under 6tons of pressure I suspect it will shift, so I will be making a small barrier to stop any movement
1412615341838.jpg

Next is the bolts, they don't tighten fully. Because of the inner curve in the steel channel. So I've got some allen headed bolts of better quality to combat that issue :)
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The bars that support the base are free to move, so I will be drilling holes and adding r-clips to prevent any chance of the bar sliding out unintentionally
1412615562871.jpg

Next is me being picky, there's no place for the handle so a small bracket to slide it in will be added :)
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After cracking my screen yesterday I need a replacement, looked into Polycarb ones and as always information on the internet was sketchy, so got on the phone

Spoke to my local MOT garage, they werent sure, passed me up the chain the local VOSA office, who passed my up to the top, the Driver & Vehicle Standards Agency
Windscreens can be made of any material for a Class 4 vehicle test, as long as there are no scratches/scuffs obscurring drivers view and the wash/wipe works

Poly screen it is then
 
Good excuse as any to go poly I guess :p
What's the betting you'll get one smartarse telling you you can't have a poly screen for the MOT
 
Got a question for the knowledgeable turbo folk for an opinion on twin turbo compound charging of sorts

Photos on the Internet suggest the exhaust blowing through one turbo, out said turbo and into the other in a traditional manner
And having turbo ones compressor blow into the inlet of the 2nd

But what I've thought is
Could you use all the exhaust pressure on one smaller turbo and instead use the compressors boosted air to spool the 2nd?

Not quite compound charging then I know but here's the advantages I can see
It'd spool the second turbo quicker
It'd spool cooler too

Any thoughts? Is boosted air through the turbine even a good idea in the first place?
 
h701micra said:
Got a question for the knowledgeable turbo folk for an opinion on twin turbo compound charging of sorts

Photos on the Internet suggest the exhaust blowing through one turbo, out said turbo and into the other in a traditional manner
And having turbo ones compressor blow into the inlet of the 2nd

But what I've thought is
Could you use all the exhaust pressure on one smaller turbo and instead use the compressors boosted air to spool the 2nd?

Not quite compound charging then I know but here's the advantages I can see
It'd spool the second turbo quicker
It'd spool cooler too

Any thoughts? Is boosted air through the turbine even a good idea in the first place?
Click to expand...

so the exhaust powers the primary turbo which then feeds its air into the turbine of the secondary turbo to try compress the same air?
will actually be inefficient cos the secondary turbo will end up being a restriction due to friction and not adding anymore energy to the air from the primary turbo.

remember that a turbo is a type of energy recovery system, intended to recover the otherwise wasted exhaust energy back into the inlet.
fitting a turbo onto the compressor side of another turbo means it recovers? nothing, bit like connecting a turbo to the inlet rather than the exhaust.

perhaps better to either:
- primary small turbo for rapid low end response,
once it reaches 100% of its max boost, a large enough external WG feeds the excess remaining gas energy to a secondary larger turbo to generate more boost on top of the primary turbo.

- turbo with a directly driven electric or mechanical assistance to spool it upto speed or

- turbo with external indirect assistance like an electric/mechanical supercharger
 
Last edited:
Did a sketch
Attached below, it might work now

Purely for spooling a second turbo

Reason I ask is I'm going down a triple charge route, not for peak hp, just for the challenge

But I'm still going to compound the turbos through the supercharger like the delta S4

But instead of one turbo, I want my smaller T28 to spool the T45 whilst the supercharger handles all boost
 
Where my post go?!
Anyway, does the pic suggest you use the boost created by small turbo to drive the large turbo's exhaust turbine bit?
 

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