Mythbuster: continuing project thread of my 1303 '75

[Bad bug]

Have any of you thought about using oteva 75 springs from Sweden. I don't know about the price but from what i hear they are good.

[Wally]

Originally Posted by Bad bug

Have any of you thought about using oteva 75 springs from Sweden. I don't know about the price but from what i hear they are good.

Yes, I looked and i believe they are probably very good also and could be much set-up like the CB's, however they are also 3,5 times the cost of the CB's (which makes them 10 times as expensive as a 'normal' spring set...).
I'll try these first

Got the 3,5" bore Borla XR1 silencer in today!

[Wally]

All parts in da house and making it all fit went well (I'am getting almost a routine in this ):



Went for a first test drive today
Needed to set-up the EBC again and by accident selected the wrong button...which led the boost rise to 30 psi before I backed off...
Fortunately all corrections and setting were entered up to 2 bar boost and the engine suffered no harm apparently. I did get launched pretty well though
Spool-up is indeed a lot slower as expected: I measured about +800rpm in the log before 15 psi was reached. I also must confess I checked the headers I welded and saw about 4 or 5 small leaks... so maybe spool will improve some when I have solved the leaks. Initial boost threshold seems a lot less slow and impressions are only about +500rpm for boost threshold.
I would have expected about +1000 rpm considering the size of the new turbo and all the extra volume in piping, so I am actually still vary happy already with spool as it is

Outside temp today was very cold: around freezing point: 0 Celcius. Intake air temperature was only 4 Celcius under boost. Air-air intercooler FTW

The most important benefit I saw from this turbo is that EGT was much lower throughout the whole rpm range, even when cruising! I had a lot to keep an eye on today, but if I had to make a guesstimate, 50 Celcius lower at least, maybe even 70-80 Celcius, but will have to investigate that when I have driven more.

I also have anothe HKS (SSQV) BOV installed and that seems to work well too. Seems to keep the flow more constant after it opens, but hard to tell exactly what/how it works different. We'll see.

Made a little vid in the hope to capture the Borg whistle, but I don't think I can hear it destinctly enough from the inside.

http://www.youtube.com/watch?v=f4iuImkFo0I

[Humble]

I love my borla xr1 it really toned down the exhaust quite a bit. How much rpm are you spinning by the time you hit 1 bar boost now? I know it added a bit more lag but is it tolerable?

I went with hks ssqv bov because a friend was using it in his car. I've found that I can keep about 10psi in the intake between shifts which really helps to kill turbo lag when rowing through the gears. I don't like the whistle though, and just put the recirculation fitting on it instead.

[Wally]

Originally Posted by Humble

I love my borla xr1 it really toned down the exhaust quite a bit. How much rpm are you spinning by the time you hit 1 bar boost now? I know it added a bit more lag but is it tolerable?

Surprisingly, it is very drivable still even lag is a lot more, but I still have about 5 leaks to fix with welding header connections...
1 bar was at ~ 3600 rpm in 4th, now its ~4400. Hope fixing the header boostleaks will help a bit to bring that down some.

[Wally]

Fixed some header leaks, so I now get 1 bar at 4250 rpm

Also got all springs back in the Tial so it opens at 1 bar when not controlled. Also retuned the maps a bit and went for a test drive again. Man, what a rush! At 1,2 bar I got actually a little scared and didn't proceed with the other higher boost settings I had planned today...

Picture from the new exhaust openings

[Bad bug]

Good job wally, i guess we can say that twin scroll turbos work, but just a little question here how did you group the exhaust pipes is it 1 and 3 4 and 2.

[effvee]

http://www.youtube.com/watch?v=f4iuImkFo0I[/QUOTE]

Hay Walter, man nice work. Question, that G50 has tall gearing, in your video was that 4th to 5th gear? It looked and sounded like you could have continued to accelorate even more. Again damn nice results, congrats.