need some input on a 350 - 375 (+) hp TT project....
06-28-2003, 07:20 AM
#1
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need some input on a 350 - 375 (+) hp TT project....
The base car is a 225 TT with the following current mods (pretty much the same as my car):
custom tuned Dahlback Racing Chip
Samco turbo and intake Hoses
custom Intake and Modfied MAF housing
Forge FMIC
Wilson Manifold - P&P manifold and tb
custom 3" cat back
ECS UDP
custom oil cooler
My friend and I are trying out a few things (on his TT first of course). This new set up will include a new turbo (IHI VF34), 550 injectors (RC Engineering), new fuel pump and the use of a SplitSecond MAP / MAF (PSC01 -003) reprogrammer (I get to play wannabe tuner). We are still waiting for the new turbo, which will be customed to have new lines and flanges bolt onto our exhaust manifold and downpipe.
The IHI VF34 (which comes standard in the Japanese market WRX STi Type RA spec C) is a roller bearing turbo. It comes on boost around the 2800 rpm range.
Waste gate open pressure 78 Kpa
Max turbine Speed 165000 Rpm
Compressor Rotor sizes 60 / 46.5 mm
Turbine Rotor size 53 / 48 mm
Approximate A / R .63
Max taget boost is about 17-18 psi, but can handle 25 psi
<img src="http://www.scoobytuner.com/images.original/37.jpg"> IHI VF34
With the upgraded injectors, fuel pump, and engine management, the VF 34 is good for 350-375 horsepower @ 17 - 18 psi.
How difficult is it going to be to reprogram this to work? Any suggestions and hints? The car is already apart and waiting for the new turbo.
custom tuned Dahlback Racing Chip
Samco turbo and intake Hoses
custom Intake and Modfied MAF housing
Forge FMIC
Wilson Manifold - P&P manifold and tb
custom 3" cat back
ECS UDP
custom oil cooler
My friend and I are trying out a few things (on his TT first of course). This new set up will include a new turbo (IHI VF34), 550 injectors (RC Engineering), new fuel pump and the use of a SplitSecond MAP / MAF (PSC01 -003) reprogrammer (I get to play wannabe tuner). We are still waiting for the new turbo, which will be customed to have new lines and flanges bolt onto our exhaust manifold and downpipe.
The IHI VF34 (which comes standard in the Japanese market WRX STi Type RA spec C) is a roller bearing turbo. It comes on boost around the 2800 rpm range.
Waste gate open pressure 78 Kpa
Max turbine Speed 165000 Rpm
Compressor Rotor sizes 60 / 46.5 mm
Turbine Rotor size 53 / 48 mm
Approximate A / R .63
Max taget boost is about 17-18 psi, but can handle 25 psi
<img src="http://www.scoobytuner.com/images.original/37.jpg"> IHI VF34
With the upgraded injectors, fuel pump, and engine management, the VF 34 is good for 350-375 horsepower @ 17 - 18 psi.
How difficult is it going to be to reprogram this to work? Any suggestions and hints? The car is already apart and waiting for the new turbo.
06-28-2003, 01:15 PM
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You should see boost (worst case) at 3100, maybe less with some IC and exhaust work
to minimize laminar flow and pressure drop problems. Should be a nice setup, except you should look at the spray pattern of the RC's on a 5v head. Might not work too well...but you never know till you try. If they don't work for you, check out GT2 injectors, those should get you where you want to be.
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06-28-2003, 02:22 PM
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already have the fmic and 3" exhaust...I had some question re the RC injectors,
however, they noted that it should be ok. I'll look into the GT2 injectors. Do you have a link or contact information?
06-28-2003, 03:21 PM
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Well...
Depending on piping, you can always improve laminar flow on a bolton FMIC or turboback exhaust solution any day of the week with a tig and a lot of patience. That, and getting a nice true cold air intake that's sealed from all exhaust and motor heat should work very nicely to fight pressure drop and "negative boost".
wrt the Porsche 911 GT2 injectors, any Bosch wholesaler or retailer should be able to get them and I know they work in the 5 cyl 4v head, but not too sure how the spray pattern is compared to the 225TT ones, but anything's better than RC's. ;-)
All of the above will work, but you might be just throwing a lot of fuel at a problem that more lies with the 5v head design than "good" or "bad" injectors. Those 3 puny intake valves are a definite fuel flow restriction, even moreso when you're trying to squeeze a lot out of it. Might want to pursue a bi-injector setup if you're running into this wall during the tuning phase.
wrt the Porsche 911 GT2 injectors, any Bosch wholesaler or retailer should be able to get them and I know they work in the 5 cyl 4v head, but not too sure how the spray pattern is compared to the 225TT ones, but anything's better than RC's. ;-)
All of the above will work, but you might be just throwing a lot of fuel at a problem that more lies with the 5v head design than "good" or "bad" injectors. Those 3 puny intake valves are a definite fuel flow restriction, even moreso when you're trying to squeeze a lot out of it. Might want to pursue a bi-injector setup if you're running into this wall during the tuning phase.