Hey guys,

Just swapped in a very nice set of N3C1 twins of a 99 spec JDM motor (not the 280hp N3G1's) and made about 359rwhp at 15psi with alot of the typical supporting/bolt on mods. The extra power feels great, I'm quite happy with the outcome.

Buddy of mine also dynoed his FD with the later N3G1's (almost identical setup) and was pretty close, only capped around 364rwhp at 15psi. IMO, don't know why people spend so much more on the N3G1's when the N3C1's are just as good and much cheaper

 

A pull in 2nd, 4 pulls in 3rd and a pull in 4th?

Your twins must be in parallel, 82hp @ 3,000rpm on that 4th gear pull. Sequential is around 120-150hp @ 3,000rpm 15psi.

Looks like ignition break-up under full load (high rpm in 4th gear pull).

 

Good eye man, you are correct. And actually I had a very weak ignition, I just got an HKS Twin Power installed not too long ago. Power seems to be a tad better.

 

Good call on the Twin Power.

 

How long have people experienced these twins lasting at the 1 bar+ boost level?

From what I've heard over the years, the longevity isn't great, similar to OE USDM twins.

Congrats on the numbers, not trying to rain on any parades. But AFAIK it's not really sustainable long term......

 

I would love to see a dyno graph for both cars showing tq curve as well. Especially if they are both non-sequential. Everyone knows, or should know, you are not going to get more peak power from the 99s. Its the tq curve where you should see the obvious difference.

 

Congrats, I also made 355rwhp @ 1bar with N3A1 twins running sequential.

 

Well, since the '99/RZ turbos aren't any bigger, and other parts of the system are a restriction anyway, 365-385 on pump gas at 15 psi is all any set of OE style turbos are really going to make sequentially. I got 390 at about 16 with a brand new motor/RZ turbos.

Compared to other OE turbos, the abraidable seals are really about better spool/response, which can't be beat with '99/RZs. I've tracked mine at 12-13 psi for over a decade and run 15 on the street over two sets. I doubt anything OE style is going to be much better.

I'm upgrading to a single really for heat on track—I just can't drive flat out for a full session in even temperate weather anymore. The extra power will be nice too though.

 

FYI, the N3C1 turbos aren't "99 spec", they started making them in '95 or so. All they are is a newer version of the N3A1 turbos, they have a higher nickel content in the cast iron so they don't crack like a bastard. Everything else is identical.

The N3G1 turbos are the "99 spec" turbos with the abradeable compressor wheel and whatnot. But, in 99 you could get either version, depending on if you had a 280ps model or 265 ps model.

Dale

 

correct, the 93 models, had an N3A1-13-700 turbo set, 94 got N3C1-13-700, and then in 1996 they become an N3C1-13-700A, and stay that way to the end.

12/1998 on adds the 280ps engine, which has the N3G1-13-700 turbo set

 

I always preached that the N3C1 was a better set of turbos to go non-sequential with. The thought being that if you're going to run a set of turbos ragged - might as well run something cheaper.