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Go Back   NissanForums.com :: Nissan Forum > Nissan Models > Sentra, Pulsar, NX, B14 200SX > QR25 2.5L Engine
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QR25 2.5L Engine Engine Discussion: 2002+ Sentra SE-R and SpecV

       
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Old Apr 27th, 2004, 05:58 PM   #1 (permalink)
specvluvr
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About to purchase SAFC II. What gains can I expect?

Any feedback is greatly appreciated w/I/H/E

Last edited by specvluvr : Apr 27th, 2004 at 06:00 PM. Reason: add more
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Old Apr 27th, 2004, 06:07 PM   #2 (permalink)
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well, if you don't have it wideband tuned, don't expect any

spend the time for wideband dyno tuning and you could see a max of 8whp with a good solid 4-7whp throughout the powerband.
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Old Apr 27th, 2004, 06:10 PM   #3 (permalink)
specvluvr
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Quote:
Originally Posted by chimmike
well, if you don't have it wideband tuned, don't expect any

spend the time for wideband dyno tuning and you could see a max of 8whp with a good solid 4-7whp throughout the powerband.
You seem like you really know your stuff, now let me pick your brain. What do you mean by wideband tuning? What mods would you recommend after the basic I/H/E, and last (but not least) how do I mod my ride to beat my friend's srt4?
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Old Apr 27th, 2004, 06:12 PM   #4 (permalink)
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wideband as in wideband O2 sensor... it is basically a more accurate sensor that can give readings of the air fuel mixture, without it your just estimating at best.
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Old Apr 27th, 2004, 06:13 PM   #5 (permalink)
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beat your friend's SRT4? full engine build + turbo, or just buy an SRT4 and mod more than his

get Nismo cams. Wideband tuning is done on a dynamometer which allows safe monitoring of the air/fuel ratio....the tool they use costs well over $500 normally. They shouldn't charge more than 100 for an hour, and you'll know how much power your car puts down when you're done
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Old Apr 27th, 2004, 06:18 PM   #6 (permalink)
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Quote:
Originally Posted by chimmike
beat your friend's SRT4? full engine build + turbo, or just buy an SRT4 and mod more than his

get Nismo cams. Wideband tuning is done on a dynamometer which allows safe monitoring of the air/fuel ratio....the tool they use costs well over $500 normally. They shouldn't charge more than 100 for an hour, and you'll know how much power your car puts down when you're done
I'll never buy a dodge--even if he kicks my a$$ in the straightaways. I like reliability more than powerful crap. I guess I better practice looking good losing to those damn SRT4's unless you can point me in the right direction of the company with the most successful turbo kit to date?
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Old Apr 27th, 2004, 06:23 PM   #7 (permalink)
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hate to tell you, his dodge may be a bit more reliable than your mexican Sentra......

a stock QR turbo kit will not beat a lightly modded SRT4...just the facts. without spending far more than $6,000+ you won't be able to beat him, really.
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Old Apr 27th, 2004, 06:27 PM   #8 (permalink)
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Quote:
Originally Posted by chimmike
hate to tell you, his dodge may be a bit more reliable than your mexican Sentra......

a stock QR turbo kit will not beat a lightly modded SRT4...just the facts. without spending far more than $6,000+ you won't be able to beat him, really.
So are you saying specv is pretty much untuneable and crappy reliability? If that;s the case, I'm getting a mistubishi evo ASAP.
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Old Apr 27th, 2004, 06:28 PM   #9 (permalink)
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That's a good idea!
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Old Apr 27th, 2004, 06:28 PM   #10 (permalink)
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Quote:
Originally Posted by specvluvr
crappy reliability
That's what he is talking about. The QR25DE hasn't been pleasing a lot of B15 owners.
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Old Apr 27th, 2004, 06:31 PM   #11 (permalink)
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Quote:
Originally Posted by specvluvr
So are you saying specv is pretty much untuneable and crappy reliability? If that;s the case, I'm getting a mistubishi evo ASAP.

it's not untuneable, it's just expensive to get over 200whp out of it. Hell, even full bolt ons to get 180-185whp still costs like $3k+overall.......you're just gonna spend a lot of money making it fast, and that generally decreases reliability.

don't get an EVO yet, wait until the financial issues of Mitsu's motors division gets worked out.......
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Old Apr 27th, 2004, 06:35 PM   #12 (permalink)
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Quote:
Originally Posted by Harris
That's what he is talking about. The QR25DE hasn't been pleasing a lot of B15 owners.
I want to be a die hard nissan fan(on my 3rd se-r),but if the qr25 needs to go through years of testing to be perfected, then they should junk it and give us the friggin sr20det in the same body style. It must be a money thing for these big corporations or something. Can I swap the sr20det into my specv?

Last edited by specvluvr : Apr 27th, 2004 at 06:40 PM. Reason: none
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Old Apr 27th, 2004, 06:48 PM   #13 (permalink)
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ya sure can, if you have enough $$ to do it.
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Old Apr 27th, 2004, 06:50 PM   #14 (permalink)
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ya sure can, if you have enough $$ to do it.
So there is hope. Maybe that will bring back some meaning to the letters SE-R.
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Old Apr 27th, 2004, 06:57 PM   #15 (permalink)
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Quote:
Originally Posted by chimmike
it's not untuneable, it's just expensive to get over 200whp out of it. Hell, even full bolt ons to get 180-185whp still costs like $3k+overall
If anyone can break the 200 WHP mark on an SE-R w/ a QR25 (especially if NA), I give you mad props.

SRT4's are having all kinds of problems also to what I understand. If you wanna beat his SRT4, (19k car with steroidaial amounts of boost=problems) buy a WRX and show em what AWD is all about!...or you could wait till his SRT4 breaks and then say you have a faster car.
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