99 twins
 

Bought a pair of 99 twins but it has the n3c1stamped on it. I've been doing my research and It seems like they did come on those years the Jdm version how can I tell if they did come off that motor. Would the serial number be different any input works thanks

Punctuation is your friend.

this is the difference..... if the inlet doesnt look like that, then theyre not "99 spec"
Attachment 627368

English class failure, my words bad!! Lol

thanks bro

99spec twins are n3g1 (manual) and n3c1 (automatic) if I am not mistaken.

N3C1's are for the 255 & 265hp S8's, while the N3G1's were on the 280hp version. Autos were the 255, while manuals could be had in 265hp (Type RB) or 280hp (all others)

Thanks so much guys. I got in contact with buddy. He said he's gonna check his shop for it.

I don't believe all 99+ models came with the better turbos.

yea that's what I heard to. Which made me confused. Cause he pulled off a 99 Cosmo engine. But it had the n3g1 stamped. Turbos only have 27,xxx and no shaft play. But i want the 280hp. Anyways we will see!!

From what I have seen..

early model turbochargers are N3A1, green colored actuators. 91-94?
then came the first N3C1 94-98, still green actuators, different secondary oil return from early model
99+ spec low power turbos N3C1 gold actuators
99+ spec high power turbos N3G1 gold actuators, bolt on abradable comp covers

The N3C1's have a much higher nickel content to prevent from cracking at higher boosts. I've also heard the Japanese tuners swapping in the earlier turbos to get more power. In IMO, you won't get THAT much more power with the N3G1's vs N3C1's. I'm sure Dale Clark can chime in on this :)

Bit off topic but I actually have N3C1 Twins in my FD boosting 15psi and is pushing 359rwhp. A buddy of mine has the later N3G1's twins also running 15psi and is only pushing a bit more at 364rwhp... not sure if the extra price point is worth it.

not much of a difference but that is def. interesting thanks for the insight.

While the newer turbos have more nickel content they aren't immune to the common cracks that develop.

Nobody claims the N3G1s have more power potential, they only offer more efficiency.

so what your saying is the life expense expectancy is longer than the n3c1

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Not really... I would put the N3C1 and N3G1 in the same category in terms of life expectancy concerning the cast iron parts. Both of them being slightly superior to the N3A1.

The biggest effect on life expectancy is that the newer turbos generally have fewer miles on them.

oh ok but as far as high end torque the n3g1 is slightly stronger then the N3c1

No, low end torque is where it should make the difference. IT'S NOT ALWAYS ABOUT PEAK POWER. So difficult to get people to understand this.

you got a point my man

My car on the 99 turbos is noticeably stronger in the mid range than before them and throttle response is exceptional. The car is over 300hp from 4250(transition to both turbos) all the way to 8k peaking just under 350 around 6500 before falling off up top down to 310 at 8k due to a few reasons, a useless intercooler being on of them(Greddy smic).

Jason

which 99 turbos you have

The G1's with the goofy seals on the compressors. Running 14psi tapering off to 13psi to be safe on the big end.

Jason

nice bro sounds efficient and reliable how much power are you running all together

348rwhp and 308 torque, stock ports.

Jason