Stock Turbo and s14 turbo Questions

[Flybert]

My friend has his CA up and running pretty well right now and he's looking for some more power. We're considering three options and money is an issue. He already has a FMIC and I'm going to give him a spare walboro I have. This car is used as a daily driver and at the track and usually gets 100 octane when we are there.

Option 1 - get a boost controller and kick up the boost until he gets somewhere around 220whp.

Is it true that a stock CA MAFS maxes out at 220whp? What boost can you run on a stock turbo to get around that amount?

Option 2 - get a boost controller and SAFC2 and use an S13 SR MAFS and run as much boost as safely possible on stock turbo and stock injectors while being able to monitor knock with the SAFC2.

Is 15psi max boost before losing efficiency like on s13 SR t25?

Option 3 - get an s14 ball bearing turbo and run stock boost at 7 psi. Will an s14 turbo at stock boost make too much power for a stock CA MAFS? When do GT28R's make full boost on CA's?

I've done a lot of searching on this forum and the answers to my questions are pretty hard to come by so take it easy on me.

[Flybert]

Buehler? Buehler? Anyone?

[float_6969]

My friend has his CA up and running pretty well right now and he's looking for some more power. We're considering three options and money is an issue. He already has a FMIC and I'm going to give him a spare walboro I have. This car is used as a daily driver and at the track and usually gets 100 octane when we are there.

Option 1 - get a boost controller and kick up the boost until he gets somewhere around 220whp.

Is it true that a stock CA MAFS maxes out at 220whp? What boost can you run on a stock turbo to get around that amount?

Option 2 - get a boost controller and SAFC2 and use an S13 SR MAFS and run as much boost as safely possible on stock turbo and stock injectors while being able to monitor knock with the SAFC2.

Is 15psi max boost before losing efficiency like on s13 SR t25?

Option 3 - get an s14 ball bearing turbo and run stock boost at 7 psi. Will an s14 turbo at stock boost make too much power for a stock CA MAFS? When do GT28R's make full boost on CA's?

I've done a lot of searching on this forum and the answers to my questions are pretty hard to come by so take it easy on me.

Option 1-Won't happen SAFELY on the stock setup. You'll hit boost cut on the ECU, possibly max out the AFM, injectors, and will be seriously over spinning the turbo. I've got a very well built CA and at 15psi I'm just under 200rwhp. That's about 220 HP at the flywheel, but you won't get that on a stock CA at 15psi. Also the turbo is MAXED OUT at that point.

Option 2-WAY BETTER than option 1. You'll still be close to the limit of the injectors, but with the walbro slightly over fueling the engine anyway, you'll probably be ok.

Option 3-This is the best option as you're keeping the intake temps to a minimum and the turbo isn't working very hard. If he's on the stock exhaust mani he should hit 7psi around 3K rpm (proabaly lower). I don't think you'll be maxing the MAFS out a that level yet, but once again, my main priority would be the stock injectors as they will be close to the limit.

[Flybert]

Yeah, tomorrow he's going to pick up that s14 turbo. We'll probably hook up my safc2 to it and monitor the knock sensor to make sure things are ok. Might retard the timing a smidge to be on the safe side.

BTW, aren't CA stock injectors 370cc? On stock s13 SR 370cc sidefeed injectors, they are good for about 270-280whp before they hit 100% max duty. I'm thinking a gt28r at 7psi on a FMIC CA18DET will make around 200-210whp. At 210whp, that would put the injectors at 78% duty if 270whp is 100%. Seems like it will be safe to me for a topfeed.

Another question about s14 turbos, how many gaskets does it take to fit on a stock manifold. One person on here says one, another says two, and another guy on here said three.

[float_6969]

The right way is to clock the compressor housing and fix the wastegate actuator bracket. Then you're only using one gasket.

[s13gold]

larger injectors and a bigger size t2....stock manifold?maybe a "ssautochrome" (people say there stuff is crap, but with pressures like 7 psi i wouldnt worry about cracking it)with the safc and a boost controller..you'll be somewhere near ur goal.what kind of exhaust are you running?

[nismoplsr]

So he is picking up an gt28r? And using your walbro.

Running 7psi on that turbo will yeild you roughly 200hp at the crank. Running a 12.4 A/F ratio the injectors will be hitting a max of 64% duty cycle.

[nismoplsr]

To run the injectors at 85% duty cycle you could probably run about 12psi on that turbo and still maintain a 12.4 A/F ratio. This should give around 220 whp.