Mythbuster: continuing project thread of my 1303 '75

[Xellex]

yeah, you're right.. I was just feeling a bit lazy, and wanted to leave all the wiring alone. But I'll use the regulator that came with the riechert kit.
Oh, and great pics!!!

[70Turbobug]

Nice Pics! What is your friend Franc running in his bug?

[Wally]

Originally Posted by 70Turbobug

Nice Pics! What is your friend Franc running in his bug?

Type 4 2056cc 44x38, Web86, Remmele exhaust, DTA E48.
Stock gearbox, which then of course broke on the line at Santa Pod on the 2nd run after some expert advice on how to launch from 'some' DKR member
Car is very, very nicely done, much nicer then mine and is very light and very good roadholding (I drove it last year).\

BTW, I have bought a piece of (cage) pipe to re-stiffen the right-hand side gearbox fork after I needed to remove one leg of the Cup-strebe because of the turbo's 4" air intake piping..

[Wally]

On my car, on drag race set-up as seen above (black wheels), the fronts rims are 3,5x17 size and rears are 7,5x15 iirc.

[ferfre007]

I understand, these wheels are safe with the car super lightweight

excuse my English, just use the translator hehe!

[Wally]

Originally Posted by ferfre007

I understand, these wheels are safe with the car super lightweight

No, not safe for normal use on the road, ONLY for dragracing!!
The gold centered wheels are for the road and circuit (18")

The car is super heavy by the way, not lightweight at all

[Wally]

Got bored today and downloaded the log from the 1,8 bar (1,8-1,9 ~26.5-28 psi actually) boost 'mishap':
Apperently the alu cylinders can survive this boost! Who would have thought that?

[70Turbobug]

Cool! Am I reading this correctly? 4703rpm and the throttleposition is WOT / 100%? The other 2 graphs are going downwards after that except the throttle-it remained opened? Sorry...I´m still learning how to read these things.Or ist that just what the peak was?

[Wally]

Originally Posted by 70Turbobug

Cool! Am I reading this correctly? 4703rpm and the throttleposition is WOT / 100%?

Correct!

The other 2 graphs are going downwards after that except the throttle-it remained opened?

No, you have to read it from right to left: the car ' drives' from the right to the left, then you see that the rpm is climbing and boost is rising, all under WOT till I take my foot off.
Hope that will make things more clearly?

Sorry...I´m still learning how to read these things.Or ist that just what the peak was?

The vertical line is just a point in time I choose in this example to let the values show. At 280 kPa (1,8 bar or 26,5 psi) boost the wastegate begins to open as boost gradually climbs less from there on. That was about 55 or 60% wastegate duty cycle (not shown or logged). Boost then rises a little further to 1,9 bar (28 psi) but you see the boost control taking boost out and adding it very quickly. Thats the effect of the EBC in action and explains the wavy line at that point onwards.
Hope this helps a bit?

[70Turbobug]

No, you have to read it from right to left: the car ' drives' from the right to the left, then you see that the rpm is climbing and boost is rising, all under WOT till I take my foot off.

Ok now I understand reading from right to left and the vertical line being your chosen point of reference, thanks! Now it makes sense How were your temps and afr at 1.9 bar?

[Humble]

I'm curious to see temps too and turbo response at lower rpms 3k-4.5k (when it starts spooling to max boost). I have to remember to read your logs right to left (backwards btw ) is that a "feature" or an option with your ecu?

Other than that it looks good, you've got me looking at the bw turbos now, specifically the EFR 8374 with a 87mm turbine and .90 a/r for my 2165cc @ 25psi (current boost limit w/o intercooling).

[Wally]

Originally Posted by 70Turbobug

How were your temps and afr at 1.9 bar?

Dude! What do you think is going on in a bug at 1.9 bar boost and 5K rpm on a public highway (german Autobahn)?
I was lucky to check the boost gauge and notice that too high setting at all , let alone watch other gauges

The log direction is stock and non changable...It constantly adds log info to the left, so everything shifts to the right as the log info builds.
Its not that strange if your used to it I guess

I agree, the new high tech BW EFR (engineered for racing) turbo's are the shiznizz! The EFR 8374 would have been my choise as well. Pity the twin-scroll version is not due untill a few months, so we have to wait for real-life results. I think the ultimate hp that that one supports might be close to mine. So, its plenty probably

[paul_f]

Wally,

With your DTA are you running it with MAP as the load for the main fuelling/ignition maps or TPS with MAP multiplication?

Cheers
Paul

[Wally]

Paul,
I have only ever ran TPS.
Now with the turbo motor I use an additional map-sensor for fuel and timing compensation when under boost.

[paul_f]

Thanks for that!

A friend is switching from an E48 to a S60 on his turbo bug and is currently using TPS and were weren't sure whether to switch to MAP as load instead of TPS. We will stay with TPS