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R31- Rb30 N/a, Converting N/a Motor To Stock Turbo Setup

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r31_skyline Rookie

r31_skyline

Posted
Posted

hello all,

I've got a R31 rb30 auto skyline ( ok, hold the applause LOL ). I'm just about to convert it to manual 5 speed. The next piece of the puzzle is the turbo setup. questions:

1. a stock reconditioned turbo setup including everything to suit a VL turbo i've priced at $1500, good deal?

2. The pinging and detonating problem?

I've been told many theories on how to get around the pinging problem that will occur putting a turbo setup on a N/A motor. Some of them sound a lil dangerous and dodgey.

theory 1: jump 1 tooth on the timing belt retarding it more than steady eddy!

theory 2: ram the adjustment around on the distributor so far that u put the bold on the outside of the adjustment bracket - too yet again retard the timing to hell and back.

theory 3: Use a spacer type head gasket to lower compression, retard the timing as far as the the distributor will allow you, then install a rising rate fuel pressure regulator.

The first 2 theories sound very lame to me, theory 1 sounds like a bush mechanic solution. theory 3 sounds reasonable to me. and yes the $1500 does include the WORKS, including big injector, turbo computer and manifolds etc.

The engine has 184k original on it so it should be rather low compression by now.

Can somebody gimme some insight??? thanx all.

FATGTS-R Experienced

FATGTS-R

Posted
Posted

We have better fuels now than we did in 1986 so the high comp issue isnt as bad as it seems. As well as the fact the VL had no intercooler. Make sure you get one though.

Go to the R31 link as posted by nismoid for a lot more info. You will also see that plenty of others have turboed the NA engine with success and have been running without drama for a long time. Some of them with higher than standard boost and making over 200rwkw. And this is without any bush mechanic mods.

My mates little brother is also halfway through doing the conversion and this is on an NA engine that was worked beforehand meaning it has higher compression at approx 10:1 I beleive. He is using an A/M ecu though.

darkl0n Contributor

darkl0n

Posted
Posted

i have done a n/a to turbo conversion on an rb30 and i had a few issues with it pinging to start with due to the fact i was running n/a injectors, stick to the following

1. make shore you are using turbo injectors, ecu and have an adj fuel reg

2. drop the timming back to 10 BTDC

3. use good fuel

with the above i was running 10psi and having no issues with it for 6 months, till i got done by the EPA and then the turbo did a oil seal.

Fitzpatrick Speed Works Mentor

Fitzpatrick Speed Works

Posted
Posted

cometic now make a 2.5mm head gasket for rb30's, they are aweseom seal well and should drop compression 1 point or so so should be around a boost friendly 8.4:1 or something like that!!!

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