Good turbo rebuild / parts places ?

[Rusty]

RS2 em, RS2 injectors and 1.5bar at 7krpm. That'd be nice, no change MAP sensor, no worries on engine internals, not much change in mid-range or lag. I like that idea No sintered clutch, rods only if I want them. £3k rather than £5-£6k and still a good grin factor, my current 300bhp can get me ill on the adrenaline rush (sideffects of a shot nervous system ).

[ericd]

I can get them done with a guarantee for any car.

I'd my hybrid rebuilt by grant (Aet) at less than 19k miles , he suggested at the time the 360 would be worth doing at the time of the rebuild , over the last 5 years I've put a minimum of 8ooo miles/year on it and the car, mileage that some on here will only ever dream of in an S2, so my opinion from one of the very few using these (in anger) on a day to day basis it was the best £450 I've spent.

I'm still looking forward to the day when someone else goes to a RR achieves 330/340hp (500Nm) or higher with standard I/C, injectors , EM and gets home again (without the use of a flatbed ), maybe we should get our acts together , get all these hybrid ideas together and benchmark them at the same place ?

[S2central.net]

RS2 em, RS2 injectors and 1.5bar at 7krpm. That'd be nice, no change MAP sensor, no worries on engine internals, not much change in mid-range or lag. I like that idea No sintered clutch, rods only if I want them. £3k rather than £5-£6k and still a good grin factor, my current 300bhp can get me ill on the adrenaline rush (sideffects of a shot nervous system ).

1.5bar on small hybrid at 7k - is he avvin a laff ?

Its all moot for me as of this afternoon... Nuther company wide pay cut

[Rusty]

Wel k24-7000 does 1 Bar nearly and k24-7200 does 1.7 Bar so it would seem too far wide of the mark , perhaps we should develop a k24-7100 and settle for 1.35

Bad luck on the pay cut. PITA buit still better than the chop

[S2central.net]

I think 1.3 is a safe ceiling at 7000... Be interesting to play for more though.

[Rusty]

With mid-range boost limited by the MAP sensor it really needs to offer near 1.5 Bar at redline to be worth the effort IMO.

[S2central.net]

Maybe so... I do see your point, but with a smaller turbine that is maybe not so easy. Be also interesting to see what ABY versus 7A or ADU exhaust camshaft will do to things.

[S2central.net]

With mid-range boost limited by the MAP sensor it really needs to offer near 1.5 Bar at redline to be worth the effort IMO.

Meant to add though - I was thinking the other way - with a 3bar MAP you could get on for 1.7bar or more in the midrange for mahoosive torque using the small hybrid.

[Rusty]

Right. What's the additional cost of a 3 Bar MAP and the availability?

[S2central.net]

Doin some spreadsheets here and a check against compressor map... Could stretch to 1.5bar at 6000rpm I think - you don't get power beyond that on S2/RS2 anyway unless you have exotic cams, then run into hydraulic lifter limits before 8000 anyway.

3bar VMAPs are stupidly expensive for what they are.... US$150 ish

I have some 2bar Bosch MAPs which could be recal'd to 3bar for EUR80 each - but MB Tuning don't seem to be trading anymore.

Then there's a really cheap 3bar MAP from Motorola - packaging is a bit odd. My personal suspicion is that the VMAP uses some custom version of that device but I'm not at all certain. I can order a couple and see how they behave when I figure an elegant way to fit them. The electrical spec is a perfect match for Bosch 3bar.

[Sonic]

We really need to find a good source of 3 bar MAP sensors, so i hope you get something sorted!

[Rusty]

Can we have a ideal torque curve comparison between stock k24 Homefries and the small hybrid with RS2 injectors and 1.5bar MAP please?

[S2central.net]

Those are going to be very similiar in low-mid range if the boost ceiling is 1.5bar... But the RS2 hybrid has more oomf in the high revs of course when the K24 is backing off. I have some XLS estimates on here somewhere.

K24 can hold 1.5bar up to about 4000, maybe 4500 with a big intercooler.
The RS2 or small hybrid will hold 1.5bar up to ~5500 on the RS2 intercooler.

So with RS2 hybrid and a boost ceiling of 1.5bar you get approx 430-450Nm available from 3000 - 5500/6000
versus the K24 which is more like 410-430Nm from 3000 - 4000/4500 at 1.5bar

Thats the ball park. I'll extract some graphs and post over the weekend - remind me though - head like a sieve these days.

Running to 1.8bar on RS2 gets over 500Nm in the mid range.

PAul