dakiller

First dyno at the Melboure VR4 meet

5 stud conversion and Brembos FTW.

I don't want to go 5 stud, I want to keep my wheels.

Cleaned, Claybared, polished and waxed.

Got E85 running in it real nice now, runs smoother than pulp ever did

Got the boost dialed up to 26-28PSI and no nasty surprises with it either now.

Ready for the dyno day next weekend.

Now I'm in need of advice, Brakes, mine are just terrible and I want to overhaul the whole lot - pads, rotors, lines, fluid, calipers? and want some guidance on the direction to take. Anyone want to give me a shopping list?

Been getting stuck into tuning the VR4 the last few weekends.

Has had high oil pressure, so that required porting out the oil relief in the oil filter housing.

Drained the tank and filled it with E85. I've had a flex sensor in there ever since doing the build, I've just never used it yet. Ecmlink makes it so easy, I literally just filled it up and ran the fuel pump for a minute before starting to circulate it and it just started and ran with the flex sensor without having to change anything.

I've been experiencing very slow spool, and it took me a while to think that maybe it is the butterfly valve in the Varex muffler that has been causing too much back pressure on the turbo. I got plans to operate the butterfly valve pnumatically switching it by ECU control, but I haven't got any of that hooked up yet. The muffler has been closed the whole time as I've been wanting to keep the car discrete and not be going BRAP everywhere in it, so I got a stick and shoved the valve manually to open it up.

Went to go down the road to do a pull and see how the tune did with the muffler open. Turned off boost control in the ECU to just run off wastegate to start with.

Pull out and mash it to WOT in 2nd gear, it hits 5000rpm and 39psi that I only know from the log and I nearly shit my pants. Turns out when you disable the boost controller in ecmlink that it closes off the boost source completely and you have no control at all. I think i'm lucky that I didn't blow the motor.

Went out for a few more go's, but there is still no boost control at all, and it is hitting 30 psi pretty hard.

Turns out I'd blown a vac line off the turbo feeding the wastegate's boost source. I guess 39 PSI will do that.

Put the lines back on, now with the boost only from the wastegate springs, and I got this.

Need to dial in the AFRatioEst closer to the wideband, it is a bit rich there. Then need to lean it out even more, probably closer to 12 for E85

Potential Tentative. The VR4 is running, but I've yet to wind up the wick on the turbo. I'll try drag along a mate a fellow member too.