how much boost can a stock motor and turbo handle safely on a 1995 r33 vspecI? also does the 95 r33 vspecI come stock wit a boost cotroller? thanks alot guys.....my skyline is ordered and should arrive at my house mid nov so im really excited and anxious.
umm ok guys dont laugh... where can i read about what 1bar means...i know by pounds of boost but i dont know wht 1 bar means...ive heard people say 1 bar or 2 bars but never knew wht that means and also does the car come stock wit a boost controller?
I would stick to a max of 1 bar on the stock turbos, I did run mine at 1.2bar but only for 1/4 mile stuff not all the time.
The stock engine should take 1.2bar all day long if you change the turbos for some bigger/uprated ones. I have been running mine at 1.4bar for quite some time now on a completely stockengine\head gasket with 2530 turbos and so far no problems. I think that the max recommended safe boost for the stock head gasket is 1.2bar, I must have a lucky one which has sealed well with age
Turbos, official limit is 0.85 Bar. Can be run up to 1.2 bar, but you takes yer chances.
Steel internalled R33 turbos can cope with 1.2 bar. Stock I/C can do 1.2 bar.
The recirculating dump valves can be replaced, but this can lead to idle problems.
It really is a good idea to invest in a programmable ECU & boost controller as soon as you can, and get them mapped in by a specialist. Heavy cost up front, but then it's only the mechanicals & tuning that costs.
I asked RK tuning a question about upping the boost on a stock motor. they said most times you get problems with a flat spot around 4000rpm when the cam timing cuts in. They will solve this by rechipping the ECU for around £450 notes.
The stock turbos in an R32 GTR will take 1.0bar easily without any problems at all. You can also put them up as far as 1.3 bar if you have the internals changed to steelies. RK tuning or Abbey Motorsport will sort out a new chip to accomodate the boost. I've apparently got a Meines 1.0bar chip in mine already and am currently running 0.9 bar which may be why I have missfire problems on high revs at full boost but not sure about that. As far as I'm aware the R33 GTR does not come with a standard boost controller just a boost restrictor which all turbo cars have to prevent the car from making up it's own mind what boost it will run. I've been told you can drill out the restrictor to allow more boost but it's adviseable to get a proper controller. I have a boost controller in mine but it doesn't work so the guy who had it before me changed the way the vaccuums were plugged up so that it runs 0.9bar all the time. Need to buy a controller myself soon as poss.
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