Mythbuster: continuing project thread of my 1303 '75

[Wally]

Originally Posted by Steve Arndt

More header pics at the import site. They are WRX this time so a bit more relevent. Divided housing, but incorrect cylinder pairing

http://www.honda-tech.com/showthread...599745&page=18

Why would you say incorrect cylinder pairing? Opposing cylinders are paired, which is correct, also on a subaru.
He just did not kept the single wastegate divided, which he should and that is indeed a BIG mistake. Might as well kept it simple and 4 int 1 then.

[Steve C]

Hi Wally

The reason that I asked what sort of pump you were using to feed the surge tank / swirl pot is that myself and a friend both had noise and heat issues when using EFI type pumps to fill the surge tank / swirl pot.

My friends pump actually failed. We put it down to cavitation in the pump as it was not restricted with a pressure regulator etc as it would usually be in a EFI set up.

We are both using Carter lift pumps now.

Obviously your car has travelled many kilometres using a pump this way, but it maybe something to consider.

Steve

[Wally]

Thanks for the info Steve! I would feel better having a dedicated large-volume, low-psi feed pump for this tbh.
I never could find anything for this.
Hmm, worth looking into Carter pumps (never heard of them before).

[Eatoniashoprat]

Originally Posted by Wally

Thanks for the info Steve! I would feel better having a dedicated large-volume, low-psi feed pump for this tbh.
I never could find anything for this.
Hmm, worth looking into Carter pumps (never heard of them before).

Wally,

http://www.summitracing.com/parts/CRT-P4600HP/

This is the one I have been using to feed my surge tank. It seems to work well and haven't had any issues yet. I had some noise from it but it was caused but not mounting it properly and the body of the pump was touching some steel, giving off some vibration.

I also have a small bleed line of 3/16" coming from my surge tank and tees into the return line. This ensures that I do not build up pressure in the surge tank.

Mike

[Wally]

Originally Posted by Eatoniashoprat

Wally,

http://www.summitracing.com/parts/CRT-P4600HP/

This is the one I have been using to feed my surge tank. It seems to work well and haven't had any issues yet. I had some noise from it but it was caused but not mounting it properly and the body of the pump was touching some steel, giving off some vibration.

I also have a small bleed line of 3/16" coming from my surge tank and tees into the return line. This ensures that I do not build up pressure in the surge tank.

Mike

I searched and noticed that one too. It flows 100 gallons per hour, which is 450 ltr/h (?) which is quite a lot: a 044 pumps 300 ltr/h at 3 bar fuel press. and 250 at 4 bar I believe. That means a lot of by-pass. I think the other Carter pumps with 72 gallon/h rate (325 ltr/h?) would still provide more then the 044, but not have as much by-pass.
Too much pump in general would not be a problem however

Tnx.

[Eatoniashoprat]

Originally Posted by Wally

I searched and noticed that one too. It flows 100 gallons per hour, which is 450 ltr/h (?) which is quite a lot: a 044 pumps 300 ltr/h at 3 bar fuel press. and 250 at 4 bar I believe. That means a lot of by-pass. I think the other Carter pumps with 72 gallon/h rate (325 ltr/h?) would still provide more then the 044, but not have as much by-pass.
Too much pump in general would not be a problem however

Tnx.

That was my thought about too much is OK. After having fuel supply issues in another car, and not having baffles in my tank I thought I'd just put something in that even if the pick-up gets uncovered momentarily there is NO WAY my high pressure pump will lose supply. My hi-pres is a WALBRO but will be a 044 sooner than later. (walbro is LOUD).

Mike

[Wally]

You're probably right Mike, so I 'won' me a 100 gph one from evilbay. Hope it gets here soon.
In the meantime, I figured this turbo needs a bit smaller A/R for this little engine and it came in today: 0.91 instead of 1.00 A/R: Just looks as big as the other one

[Wally]

Ah, mystery solved ;-)

[Steve Arndt]

Right you are. I was viewing on a small netbook screen.

[70Turbobug]

Man....we have to wait almost 2 weeks? That sucks LOL! If the trend keeps going as it has in the past,this change should also bring up another 50HP at the same boost level? I´m sure you will pass the 450HP line...

[MarnixGSR]

Ultra cool.

[Wally]

Just went for some better fuel just across the border today and had the opportunity to tune the maps again and check out the new feed pump, higher fuel pressure setting and the other turbine housing.
All worked VERY well
Boost threshold for my own 1 bar boost reference went down 300rpm to about 4030 rpm
Boost and fuel was also very stable so tuning was much more easy.
All set for dyno day

[Xellex]

Wally, a quick question: Are you using the stock beetle voltage regulator or the riechert (porsche) one? I'm trying to build a 1.7 type4 for this season, and I was wondering if I could just use the stock regulator, in it's original position, and wire the porsche alternator just like the orig. vw one was.

[Wally]

What regulator is a topic on its own. Get the right one, type4's also work, but not always as good as could be. I use an electronic one.

Anyways,
Got my pics from Julian today Yeah!:
Thanks to Julian Hunt for making these: http://www.julianhunt.net





and some of my buddy Franc his car:

[ferfre007]

Originally Posted by Wally

What regulator is a topic on its own. Get the right one, type4's also work, but not always as good as could be. I use an electronic one.

Anyways,
Got my pics from Julian today Yeah!:
Thanks to Julian Hunt for making these: http://www.julianhunt.net





and some of my buddy Franc his car:

amazing!!!!!!!!


what are the dimensions of the wheels?