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Who Said Rb20 Nics Were Useless?

Turbo Tim
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Turbo Tim Collaborator

Turbo Tim

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Posted

Just thought I would share this video around here.

Its an RB20 NICS powered bluebird wagon at the ingham car show. Only reason I posted it up was that my brother used to own an R31 which had that particular engine in it before it go sold and stripped and put into the bluebird in question.

Made about 180rwkw in the r31 on stock ecu running a hitachi HT18 from a series 4 rx7, 2 rx7 cores welded together and 2.5" press bent exhaust. Running 13psi or some such.

Apparently it now runs an after market ecu and about 20psi. So maybe those really old nics arent as bad everyone makes out :dry:

Kills the rear tyres pretty quick too!

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https://www.sau.com.au/forums/topic/120641-who-said-rb20-nics-were-useless/
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frigjam Collaborator

frigjam

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THats something new I definately didnt know!

I guess the stock turbo had to be the major problem on them?

Stock turbo is SMALL. And the ECU is rather ordinary in its low state of tune. Slightly more restrictive intake than a silvertop. Basic engines are the same as a silvertop other than the 12 port head intake. Piss easy to get that sort of power with the ECU and a decent turbo sorted.

frigjam Collaborator

frigjam

Posted
Posted (edited)
The NICS in my 200zr currently only pumps out 150rwhp, the stock ECU holds it back big time and the AFM is maxing with 10psi from an R33 snail....

I found the EXACT same thing with my NICS in both the Passage and the 200ZR - both with R33 turbos. At revs of around 6k upwards the voltage of the AFM hits pretty high figure of around 4.8v (which is 100% usage according to the SAFC) and as soon as it hits that, the thing is running so ridiculously rich it pisses and farts. Need to calibrate the AFM or use some sort aftermarket management to solve it.

Edited by frigjam
200zRRR Enthusiast

200zRRR

Posted
Posted (edited)
I found the EXACT same thing with my NICS in both the Passage and the 200ZR - both with R33 turbos. At revs of around 6k upwards the voltage of the AFM hits pretty high figure of around 4.8v (which is 100% usage according to the SAFC) and as soon as it hits that, the thing is running so ridiculously rich it pisses and farts. Need to calibrate the AFM or use some sort aftermarket management to solve it.

Yep, if I had a scanner I would post my AFR graph from the dyno run, at 5500rpm the fuel curve goes rich down to 11.0 (and power curve dies accordingly) then it leans to about 12.8 by about 7500rpm. At 12psi it basically blows the spark out and gets even worse power curve. 10psi is only about 7-8psi manifold pressure thanks to shitty 7MGTE supra FMIC Im running.

The SAFC2 wasnt really designed with the NICS in mind, the AFM setting (4 if I remember correctly) is for the R31 ECCS AFM which I believe is actually somewhat different (possibly different voltage range). I have an SAFC1 (5 dial model) but its got lots less tuning scope. Mine also reports 100% AFM usage by ~5500rpm.

Basically the options from here are full aftermarket ECU or R32 ECCS engine swap....both come in at about the same mark (~$3K) and I am leaning towards the latter as at least one of my injectors is leaking and she is getting some km's on her now...

Edited by 200zRRR
  • 6 years later...
Ljrb20det Apprentice

Ljrb20det

Posted
Posted

I have a rb20 out of a 200zr which used to have the top mount inter cooler. It still has the original turbo! Was wondering if anybody can help me out as to what type it is?

I'm currently on the look out for a bigger turbo.

My car has a 700x600x75 inter cooler, rb26 injectors, autronic sm4 computer. Fully manulised Jacob four speed trans.

My issue is I'm struggling for kw. I only have 145kw at the wheels.

Can anybody suggest anything to help me out?

I have heard of putting spitfire coil packs and removing the inlet butterflies between the plenum and the head? Apparently they are not needed!!!!!!!

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