I purchased a replacement stock fuel pump but upgraded the turbo to a T25 from a sr20 with 8 psi of boost. I have read that the stock fuel pump is too small for the job. If I upgrade to the 195lph walbro will my stock injectors be able to handle the increased fuel flow? Will i notice an improvement in performance? I plan on installing an fmic and a afr gauge fairly soon, so hopefully everything will be in balance. Thanks for everyones input so far.
The stock fuel pump will be fine on stock boost if you turn up the boost then youll need injectors not a fuel pump the injectorswill retrict you before the pump does but to be on the safe side get both the 195 is perfect. You wont need an aftermarket fpr ( fuel pressure regulator)
Neither are true, no offense Jason...
The stock injectors are indeed small but there is *some* room with them, albeit not much.
Stock field pump alone is insufficient for safely raising the boost beyond factory levels. Also, a pump rewire using a relay is needed to properly power a replacement pump for enough fuel delivery beyond stock boost.
The Walbro 190 is sufficient, *with a relay rewire*, and won't overrun a *healthy* factory fuel pressure regulator, but chances are your nearly 30 year old original regulator's spring is weak,.or may even have a small leak in the diaphragm. I wouldn't trust raising the boost until a proper fuel pump with a proper rewire is done, along with a reliable FPR. Might as well go Nismo or Aeromotive, as neither are expensive and it isn't hard to modify your fuel rail for them.
The two main points here to consider are the age and condition of the related components, and the power requirements of a fuel pump. Injectors are a consideration after that, and even then you aren't boosting very high. Stock boost is 7psi on the factoty T2 (although weak old wastegate springs are probably just holding 5 psi). 8 psi on the T25G is probably ly more like 10 in the T2, which your factory system *should* be able to support provided everything is in proper working condition. Because if it isn't, you should be focusing your attention to that, and not more boost ;) CA18ET isn't a forgiving engine nor is it very strong.
Ok, my goal isnt so much about making horsepower. I had a bad turbo which directed me into the cheapest replacement route ie the T25. My main concern is that I'm not running too lean (need afr gauge i know). If i can accomplish my goal and get a slight performance boost the better. I also intend to replace the et with a det within 2 years or so and would like to ensure that any parts I but now would be transferable to the new engine. The car drives fine and pulls pretty good just based upon feel, since I'm a new to these cars I just want to avoid a dumb rookie move since I've already upgraded the turbo.
I get what you're saying, and I'm glad you have a sense of caution. It might feel strong but it might be seeing a bit of detonation you aren't aware of. A slightly lean engine often feels strong before it pops lol. Not good. I posted a suggestion in your O2 sensor thread for some reading in another section... start there to avoid troubles and then ask more questions if you need to :thumbsup:
Lol how is what i said not true you explained it a little better but basically said the same thing. Also I pointed out to get both to err on the side of caution.