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the injs are still wha they are but at a higher FP
I think what he was asking is: Is a JWT 4bar/370/bored maf program essentially the same as a JWT 3bar/427/bored maf program? or are there other differences in the program, other than injector correction.
My guess would be no, they are pretty much the same, just with different injector correction.
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Originally Posted by BORNGEARHEAD
It's pathetic the amount of people in this country that believe all the bullsh*t being spewed out the mouths of Bush, Cheney, Rove, Rice, Snow, oil companies, lobbyists, etc.
Is the MSD @ 4 bar running pore for only MSD brand or do you mean Top feed style injectors in genral.
I think its just the MSD"S because they're rated up to around 65 psi(JUST guessing), where as the Mototron's are rated up to 85psi...and as you know, the stock FPR increases fuel pressure 1:1 with each pound of boost.
but that is relative, there is a big difference in flow between 72lb injectors at 100psi and 370cc injectorst at 100psi
No, not really. Pressure is pressure; you are creating 100 lbs. per square inch on the fuel lines. The fuel injectors merely act as a 'blowoff valve' sort to speak.
No, not really. Pressure is pressure; you are creating 100 lbs. per square inch on the fuel lines. The fuel injectors merely act as a 'blowoff valve' sort to speak.
Yes pressure is pressure. But reread it.
Quote:
Originally Posted by will
but that is relative, there is a big difference in flow between 72lb injectors at 100psi and 370cc injectorst at 100psi
Of course there is a big difference in flow. Once a certain flow rate is reached, the pump will be unable to build pressure to the desired point. Why does unluckys project need twin walbros for his 800cc injectors if there is no difference in flow?
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So for instance,MSD Top Feed 50lb Injectors top out at 355?
Do that mean the Duty Cycle on the injectors will be damn near 100% at around 360? Where it starts to lean out?
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There is a point at which you will put to much strain on the pump and fuel lines will have to be way stronger.
is there a general # to work with there? I mean, 5 bar base pressure is obviously a bit excessive, but how high can the stock system go before lines burst, o-rings leak, etc. ? all this assuming the pump can support it, of course. wouldn't it also be boost dependant on turbo applications, too? ie: a 4 bar setup at 20 psi boost runs a max of 79-80 psi (1:1) but a system running 4.3 bar (62 psi or so) fuel pressure and 15 lbs of boost will max out around 77 psi. does it have more to do with the constant strain, or on the max part-time operating pressures?
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'92 white se-r: de+t t25, fmic, b15 trans, cat delete, hks cat-back (ugh), safc-2, u13 ecu, smc sts, hypers/agx, random other stuff not worth mentioning...
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Running at 4 bar is better than running at 3 bar. Here is why, you can get more WHP from your inj at 4 bar, there is no xtra cost for a 4 bar program from JWT, you get better drivability at 4 bar because of better fuel atomization and you car will do better at the emmisions station becasue of better fuel atomization.
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I have a '96 G20 w/ basic bolt-ons & S3's.
I'm planning to send my extra ECU to JWT for reprogramming, soon.
It so happens that I also have a NISMO fpr & a set of 370cc injectors in excellent condition laying around from an abandoned turbo project.
So...
Since I already have the parts laying around to go to 370cc 4-bar, would I see a noticeable improvement in drivability and, especially, fuel economy - in an NA car? Or, strange as it sounds, just going 4-bar w/ the 259s?
We all want more power available, but with gas heading back over $3 a gallon for a while, more miles to the tank would be a good thing.
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is there a point where you need to upgrade something else once you get to a certain whp? i mean, with a big turbo that makes 350 hp youd need the 50 lbs or555s... but what else other than a clutch, i mean engine upgrades, do you need for that hp and more? my friend has the gt2871 and everything else is stock.. he just doesnt put it on max boost. so do u REALLY need an ecu or whatever else? i just wanna know basics really.
alright quick question. i have a silvia t28 on my sentra pushin about 10 to 12 lbs and ive got 370's. ive got a jgy fuel rail and some 50 lb injectors for a good price. ive got a an adjustable fpr and want to turn up the boost. is 50lbs to extreme. and take it easy guys. im new to the whole fuel thing.
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t3/t04e 60 trim. 38mm waste gate. 72lb injectors. custom log manifold. jgy fuel rail. on that jwt yo. gay bb motor. and many more go fast goodies riding on 26" rims ....
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