Mythbuster: continuing project thread of my 1303 '75

[paul_f]

HI Wally,

I think you misunderstand me a little.

You only run this test once, and this is only to tell you how the boost rises against RPM.

At 4000rpm you can easily attain 1.6 bar, but at 1500rpm you will struggle to make 0.5bar, 2000 maybe 1 bar.

If you set the DTA demand curve at a higher boost pressure (ie 1,6 bar at 2000rpm) than the engine can attain then the controller will wind up, so then it is to slow to open the valve which causes the overboost.

With its single calibration for P I and D I doubt the DTA can be made to work to do everything. I personally would only initially use it to try to eliminate wastegate creep.

I don't know what makes it particularly advanced, but from the available calibrations it looks extremely simple to me.

For the PIDs I work with, we tend to have 10x10 maps with additional multiplication maps to make them work correctly.

If you have the means then a standalone boost controller would definately be an easier route with more likelyhood of success.

[Wally]

Originally Posted by paul_f

HI Wally,

I think you misunderstand me a little.

You only run this test once, and this is only to tell you how the boost rises against RPM.

At 4000rpm you can easily attain 1.6 bar, but at 1500rpm you will struggle to make 0.5bar, 2000 maybe 1 bar.

If you set the DTA demand curve at a higher boost pressure (ie 1,6 bar at 2000rpm) than the engine can attain then the controller will wind up, so then it is to slow to open the valve which causes the overboost.

.

Ah, yes, I misundestood
See your point now and I agree, after two years of trying, I think a aftermarket ebc would be best also.

[Wally]

So, in absense of an ebc, I just deleted all settings and ran on wastegate today at our first trackday of the year. Its was COLD!
Track was partly covered in ice we we arrived early in the morning...
First session was a wet track, the 2 session afterwards were dry. Yesss!
Had great fun doing easy laps driving/learning the lines. New rear brakes bedded in nicely, but fronts still block first. Maybe also semi's up front as a next tire choice.
Still with the old struts, and the thicker rear torsion bars get my thumbs up! All in all a good test day :-)

http://www.youtube.com/watch?v=Tq_m04LZreM

[fahrvergnugen]

You've bin very busy Wally, well done

Wish my car was ready for track day's. Hope to drink some Hertog jan with ONN again this year.

Paul.

[Wally]

Cheers Paul, me too!


Big tnx to Franc fo taking the pics in that cold winter day

[volkdent]

You've made me jealous! I've got to wait till the end of this month to attack Laguna Seca. The bug won't be ready by then, but at least I can get on the track!

Looks like you had a lot of fun, are you thinking about adding dual master cylinders and a balance adjust feature?

Jason

[Wally]

Originally Posted by volkdent

You've made me jealous! I've got to wait till the end of this month to attack Laguna Seca. The bug won't be ready by then, but at least I can get on the track!

Looks like you had a lot of fun, are you thinking about adding dual master cylinders and a balance adjust feature?

Jason

Driving on Leguna Seca would make me jealous Jason!

Yeah, your right: dual masters and balance bar would be the best solution for me at this point. The installation however would involve things I rather don't like to do, so I'll try to postpone this decision...