snub disphenoid

My new car purportedly has upgraded twin turbos from Knightsports. I was wondering if anyone has these or knows anything about them. I like them a lot for the super quick (and loud!) spoolup, but I don't really know anything regarding what boost levels are safe for them/what kind of power they can make. Thanks, guys.

DomFD3S

They utilize Turbonetics turbos. But apart from that info, that is all I know. At least until I make a call...

BlueRex

FDNewbie should be here shortly giving you the specs. I believe this is one of the products he sells.

FDNewbie

iTrader: (10)

LOL right you are BlueRex...

Knightsports RF420 twins, good for 420ps (415 hp)

Knightsports
Major(compressor) 60.1MM
Inducer 47.4MM
Bearing 9.17MM
Majoor(shaft) 5.96MM
Inlet Size 46.8MM

Stock
Major(compressor) 57.0MM
Inducer 42.1MM
Bearing 7.75MM
Majoor(shaft) 4.97MM
Inlet Size 42.55MM

Sold for about $3200 new, or about $2400 used in excellent condition.

~Ramy

snub disphenoid

Do you think I could make around 350rwhp@13psi? I want to be around there, but also at a safe and reliable boost level. Also, if it's possible, I'd like to use a Power FC for engine management, but I hear that it's not the ideal choice. I also don't want to have to use a hand controller to tune, as it takes away from the stock looking interior.

DirtyD916

just face it the 600rr can never lose !!!

FDNewbie

iTrader: (10)

Around, yes. Exactly, no. 415 at @ 1 bar = about 353rwhp @ 14 psi, so you'll be real close.

The twins are good for 16 - 17 psi no problem. The issue is your fuel. The stock fuel system will only support 12 psi safetly. 13psi and up you're pushing more than 80% duty cycle. 15 psi, you're pushing 100% duty cycle.

I dunno who told you that. The PFC IS the ideal choice. Most widely used, well known, and the vast majority of ROTARY tuners are *very* familiar w/ it. That's my warning to you; do NOT have a piston motor tuner try to tune your rotary, no matter HOW good they are. Apples and oranges. You need a WELL KNOWN rotary tuner.

You can leave the commander (the hand-held part) in your glovebox or under the seat etc. It doesn't have to be in plain view. Your tuner needs it to tune, then you can put it away.

~Ramy

snub disphenoid

Alright, Power FC it is, then. I'm going to sign up for the Steve Kan tuning session at SevenStock, and before then install the PFC/commander and upgrade the fuel system to 850cc/1300cc. It already has a Cosmo fuel pump so I think that would be enough. I don't know what PSI is reliable for a stock engine, though. It may only have 2000 miles but I don't want to pop it in the next 30,000 or so.

And Dirty, if I make 350rwhp you might be in trouble...

FDNewbie

iTrader: (10)

Sounds like you're on the right track. Just make sure you have the correct supporting mods like downpipe, exhaust, intake, intercooler, replacement AST, you'll prob need an HKS twin power for the breakup at higher rpms, efini y-pipe, HD clutch, etc.

snub disphenoid

I've got most of those, and before the tuning I'll probably have them all. Thanks for the info!

FDNewbie

iTrader: (10)

NP In fact, if I can help ya get any of 'em, plz lemme know!

Improved FD

that and the fact that running 93 pump gas above 14 psi is playing with fire, esp with twins

FDNewbie

iTrader: (10)

Yes, 14 - 15 psi on pump is pretty much the limit, but eh, I know a cpl guys who know what they're doing and have run 16 - 17 psi on stockers for YEARS w/o ill effects. A lot of that comes to being smart w/ your setup and good tuning as well.

Improved FD

on 93??

FDNewbie

iTrader: (10)

To my recollection yes...but I can double check that. Paging Chris...

njstreetrx7

Few Have Even Ran 17-19 On Pump

Kevin T. Wyum

My F4i with a power commander and two brothers slip doesn't loose to 600rr's :P and it's a lot more comfortable