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Discussion Starter #1
im planning on getting a bisi d15b/zcvtec stage 2 cam(hopefully soon)with adj. cam gear, and getting my auto p28 ecu chipped/tuned. im just runnin good i/h/e setup with [useless] full msd ignition setup for now, i was just wondering if an adj fpr would be needed or even suggested for the tuning session...?(hopefully dyno tuned with crome/hondata etc. which program would you suggest for an auto n/a tune?)
 

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Discussion Starter #2
all i really want is to dial in the a/f ratios, cam timing(once i get the right cam/gear), ignition timing if needed, and vtec x-over if needed....is there really anything else involved in tuning?

and yes, this is for an obd1 jdm d16zcvtec...
 

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I've been tuning for many years now and an adjustable FPR is NOT required for a good tune.

I've had many decently modified N/A and Turbo cars run the stock FPR with great success.

One of the reasons people might get an adjustable FPR is if they can't afford bigger injectors and a tune.

If you're getting tuned then I'd just try to locate bigger injectors like DSM 450's or something to that effect. You really don't need anything huge. You might even be able to catch a deal on some used Precisions or RCs.
 

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would i really need injectors other than stock for just i/h/e/cam?
your stock injectors will be plenty big enough for your motor.. idk what he was talking about... 450's for a n/a motor??? lol.. the stock fpr isnt a concern until over 400hp
 

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Discussion Starter #6
ok, i was just wondering if there would be an advantage to having an adj fpr during the tuning session or not, but i guess not. what all do most tuners mess with aside from a/f ratios, cam timing, ignition timing and vtec x-over(where applicable)?
 

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you may not need it for a ihe cam, but from experience if you add something on to the car or the tune changes, etc. you can crank up the fuel pressure a bit to get you home or to a tuner. Like when I mess with my tune, and I don't have my laptop I can adjust fuel pressure so I can still drive it. and you can mess with higher pressure for better atomization.
 

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would i really need injectors other than stock for just i/h/e/cam?

I would think you'd be fine with stock injectors for what you're doing.

I was just offering idea of using bigger injectors with your tune instead of an adjustable FPR if that's the route you were really wanting.

I suggested DSM 450cc's because they were cheap and common and since you were getting a tune they can be made to run your setup well and leave room for improvement if you added other things down the road.
 

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I would think you'd be fine with stock injectors for what you're doing.

I was just offering idea of using bigger injectors with your tune instead of an adjustable FPR if that's the route you were really wanting.

I suggested DSM 450cc's because they were cheap and common and since you were getting a tune they can be made to run your setup well and leave room for improvement if you added other things down the road.
very true, 450's are still small enough to run lean as hell at idle on a 1.6.
 

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Discussion Starter #10
ive just read that 55psi fuel pressure is ideal for our engines....thats y i was asking(un;ess that can be changed via ecu)
 

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FPR is useless if you size your injectors with your hp goal. Your stock injectors at stock fuel pressure will make close to 140whp at 80% duty cycle. With your basic mods you'll be fine. Tune with the chipped ecu.

As stated above, the only time you need an aftermarket FPR is when you dont want to upgrade your injectors. For example, stock injectors bumped up to 60psi fuel pressure will make approx 165whp at 80% duty cycle.

So to answer your question, no you dont need one if you have a chipped ecu that you are going to tune with.

There is no truth to D series running better at 55psi fuel pressure. Every engine is different, especially when you modify them and needs to be tuned individually. IMO best done by some kind of fuel management system via the ecu.
 

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Discussion Starter #12 (Edited)
so with i/h/e/cam i wont need a adj fpr or adj camgear for tuning, everything can be change via chipped/tuned ecu?

also, who you you choose to chip/basemap a p28?
 

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Dsm 450's have poor atomization qualities. Obviously stock is the perfect candidate since you own them already.

Unless you wanna get down you can do like the ballers do and use cbr600rr injectors at 60psi rail pressure and tune. Just sayin
 
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