I have been having problems with the secondary turbo ever since I bought this car. I finally got some issues resolved, and dyno'd the carj. for some reason it would not register torque, so you will have to go with HP only.

I dyno'd at 296rwhp!

mods are
DP,MP, intake, pettit unlimited computer, STOCK catback, STOCK intercooler, STOCK injectors.

the runs were at 14lbs

air fuel ratio was under 10:1 verified by a wideband

Ive seen posts on here that the stock fuel system isnt adequate for high amts of boost. why am I running 10:1 at 14lbs?

 

It's not the stock fuel system can't handle it, it's that you don't have any room to grow. I've seen the stock fuel system (aside from an upgraded fuel pump) do 360rwhp.

Your problem is the stock IC running 14 PSI.

 

Because your injectors are running damn near 100% duty at that boost level. There is NO room for error. This is why people running over 12 psi regularly invest in a fuel pump and larger secondary injectors.

Also, as Mahjik pointed out, with the stock IC, you are working your turbos WAY too hard and you will have extremely high intake air temps.

Personally, I wouldn't run over 10 psi with the stock IC.

 

get some 1300 cc inj if you want to run over 12psi. Even with my old setup which is similar to yours now, i was seeing 9x% inj duty cycles....i didnt like that so i upgraded to the 1300cc.

 

You don't need 1300cc injectors to run at or over 12 PSI.

 

i did.

 

Wow, great results. My father also has a very strong running FD---his R1 dynoed at 290 rwhp with intake, downpipe, catback, and PFS purple box running 12 psi. Stock intercooler, stock main cat, stock fuel system, stock ignition. This was on a newer reman that he installed himself, and rebuilt stock twins.

 

Having high injector duty cycles isn't necessarily a bad thing. It just means there isn't any room to grow. The A/F ratio is more important. As long what you have will provide the proper A/F ratio for what your car is running, there really isn't a need to upgrade.

I think people get a little too paranoid about injector duty cycles sometimes.

 

hear ya...but with an 11.2 afr i was seeing high 90s....that makes me nervous. and it should....where is my margin for error? ya know?

 

Sounds more like improper tuning. However, if your happy, that's fine. I'm just pointing out that there have been people for years that have run 14-15 PSI on re-programmed stock ECU's (so no upgraded injectors) without any problems.

 

there also has been yrs of people blowing up FDs. I think the power fc has added some reliability and there is much more understanding outthere nowadays. Maybe people were running 100% duty cylces back then but didnt have a way to monitor them.

Whatever...i am just pointing out my experiences,,which dictate that with an 11.2 afr @ 12psi...i was seeing inj duty cycles that made me uncomfortable.

 

The point is that as long as the A/F is fine, high duty cycles are a preference. If you aren't trying to push the car any further, then it really doesn't matter.

 

A good message from last year: