wolverine

^^yeah exactly

$30 turbotech boost T vs frigging around?!?! Boost T pretty clearly the winner.

I hope Mr Handsome recovers quickly.

I tried hard to edu-macate myself.

The factory BOV has the small hole in it which allows a small constant recirculating leak to the front of the compressor already. This seems to soften the opening of the BOV when there is light throttle comp surge. Aftermarket BOV's seem prone to opening and shutting quickly when the pressure wave cracks them open. Lighter spring settings seem to reduce the alternating open shut cycle but there still might be something in the tune to help. Possibly by moving the peak cylinder pressures around ATDC might change the amount of still combusting exhaust gas making its way out of the exhaust valve. With regards to fueling, if the tuner is sitting on the plateau of best leanest power (most economical edge of that plateau) or best richest (most responsive edge) perhaps moving it one way or the other might eliminate surge. I am guessing if you run a bit more advance in the cells around the 3200rpm on the current fueling levels (assuming it is not knock inducing) might get the job done but also going a whisker leaner but a little less advance might help. Reducing later cycle combustion at that point might slightly reduce the energy acting on the turbine for a few 100rpm.

Can you post up the AFR's and IGN timing at the point of surge when you check it out tomorrow.

I assume there is an aftermarket BOV on there. You can try softening off the tension on the spring until the light load surge ceases.

More boost = car cutting out hmmm.... Have you tried lowering the boost to the previous level? (this is a very commonly asked question btw)

Stuart @ Racers Choice in Seven Hills sorted both cars out for me. I have no doubt there are some off the shelf items that might suit but the rear muffler for the stagea needed custom building. This was manufactured elsewhere but I am not sure who Stuart uses.

That is a good looking turbo. Have you got any photos of the other side? I can't see the serial numbers even when I zoomed in really close....

The stagea has a mid muffler but Ms Wolv wanted it dead quiet so we fitted a custom 3" straight through 18" x 12" x 10" (lots of height and room back there) and it is quieter than stock. In a bid to discourage more "random breath tests" by our increasingly pro-active constabulary I also modified the R33. It had a 3" exhaust with hotdog and largish cannon. I replaced the hotdog with a mid muffler (prob 12" x 10" x 6") and it dropped the noise significantly, later I changed to an oval rear muffler (12" x 10" x 8") and it is quieter again but not stagea quiet. Located in the Hills if you want to see want to see and hear.

Without driving the car it is hard to judge the transient response of the GTX turbo. The GTX3071 is still the one I want to see more results on a RB25. Slight correction there is a 0.63, 0.82 and 1.06 IW (in the Garret range) the 0.78 is a ext twin scroll housing.

It has been tuned for 11:1 AFR's so some of the power can be found by pulling out some fuel and taking it toward 12:1 or wherever it makes best safe pwoer. The richest run (10.8) to the leanest run (11.2) on that dyno makes about 45hp difference at 5600 rpm.

Go the old school turbo.

I think you have answered your own question......best flow = biggest cat

If the turbine wheel is made with ferrous material it will work but not all metallic turbine wheels are magnetic.

Why is it cheap? 1/10th the price because you get 1/10th of the confidence that it is the genuine item.

^^ x2 It looks like the bracket isn't located on the hooks.

Well if I lived around the corner I would be keen to keep the event in Melbourne. Since my folks live outside of Bathurst a $300m redevelopment of Mt Panorama to bring it up to standard for F1 would work for me.

Whatever happens in Australia can F1 replace Melbourne with a real race track...anything but a street circuit.

Do they supply with them flanges bolt to factory orientation on request?

No sad faces here, it is great to see more M35's getting some good numbers.

Wat iz da best suonding BOV? ps. Mafia don't be a hater.

190-210rwkw is about where they come in at with some outlying results above or below. The low reading dyno is the one everyone has a print out from. No one ever goes to one that reads high.

Yeah and we all packed in the trouser department too. Ash are there any of the examples using OS valves at Racepace or do they prefer using stock sized valves.