Spec V and the Altima 2.5L - Nissan Forum
QR25 2.5L Engine Engine Discussion: 2002+ Sentra SE-R and SpecV

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post #1 of 35 Old Aug 12th, 2002, 12:31 AM
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Spec V and the Altima 2.5L

I remember reading somewhere that the 2.5 L is the same 4 cyl. engine that is in the Altima. I would therefore assume that all engine mods for the 2.5 Altima would also fit our engine. My question is......anybody know if cam gears and pullys are available for the Altima 2.5 that just isn't showing up for the Spec V? I've just starting researching this but maybe someone has already done this and either came up empty-handed or has some goodies. What's the word?
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post #2 of 35 Old Aug 12th, 2002, 07:12 AM
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Wink Re: Spec V and the Altima 2.5L

Quote:
Originally posted by nissanspecv
I remember reading somewhere that the 2.5 L is the same 4 cyl. engine that is in the Altima. I would therefore assume that all engine mods for the 2.5 Altima would also fit our engine. My question is......anybody know if cam gears and pullys are available for the Altima 2.5 that just isn't showing up for the Spec V? I've just starting researching this but maybe someone has already done this and either came up empty-handed or has some goodies. What's the word?
yes they use the same engine. no there are no pulleys available at this time or cam gears. But if there were they would fit the spec v (I think)

:thumbup:
02 spec (173.1whp,178.9lbft)retired
94 se-r (342whp, 289lbft @15psi)
92 se-r (sr20ve with N1 cams DD)
www.cardomain.com/id/cortrim1
post #3 of 35 Old Aug 12th, 2002, 12:37 PM
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While the Altima and SE-R share the same motor, they do not share the same ECU (to my knowledge). This means that perfomance mods will fit both cars, but the computer will react diffrent to each mod. Also the drivetrain is diffrent so mods like CAI's and Exhausts will not be the same. Mods like Pullys should work on both cars, cams would be a diffrent story again because of the ECU and the way the computer adjusts the power in the SE-R vs. Altima. The exact details and diffrences are unkown becasue there are very few parts out there so far. Also people looking for performance out of the Altima bought the very powerful 245hp V6 trim.

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post #4 of 35 Old Aug 13th, 2002, 04:10 PM
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Is the ECU in the Altima better than the one in the Spec V? What are the differences?
post #5 of 35 Old Aug 13th, 2002, 04:19 PM
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I doubt that the Altima ECU is better, I don't know for sure that either one of them are "better" they just have diffrent applications. I'm not sure what the stock HP on the Altima is??? that would be a good place to start. I do know that becase of the Tranny diffrence the ECU is diffrent, and NOT interchangable.

-- 2002 SE-R Spec V
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post #6 of 35 Old Aug 14th, 2002, 07:08 AM
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Quote:
Originally posted by BlackoutSpecV
I doubt that the Altima ECU is better, I don't know for sure that either one of them are "better" they just have diffrent applications. I'm not sure what the stock HP on the Altima is??? that would be a good place to start. I do know that becase of the Tranny diffrence the ECU is diffrent, and NOT interchangable.
the hp rating is the same as the spec v

:thumbup:
02 spec (173.1whp,178.9lbft)retired
94 se-r (342whp, 289lbft @15psi)
92 se-r (sr20ve with N1 cams DD)
www.cardomain.com/id/cortrim1
post #7 of 35 Old Aug 14th, 2002, 12:44 PM
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Since the Altima uses a 5 speed, couldn't its ECU be installed in a base SE-R to get the 10 extra hp like the Spec V?
post #8 of 35 Old Aug 14th, 2002, 12:50 PM
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Does any one know the specific reason why the altima 2.5 only requires 87 octane and the SE-R requires 91?

They both have the same compression ratio and I though that was really the main factor in needing a gas with more resistance to detonation.
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post #9 of 35 Old Aug 14th, 2002, 02:51 PM
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timing is why you would need higher octaine gas. I can't see the altima having the same HP running 87 octaine... it would face even harsher retarding of the timing than the spec v already has with 93...

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post #10 of 35 Old Aug 15th, 2002, 07:19 AM
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Talking

Quote:
Originally posted by BlackoutSpecV
timing is why you would need higher octaine gas. I can't see the altima having the same HP running 87 octaine... it would face even harsher retarding of the timing than the spec v already has with 93...
I know what your saying but nissan lists the hp rating the same.
The turbo muffler bering is responsible for the extra 10hp

:thumbup:
02 spec (173.1whp,178.9lbft)retired
94 se-r (342whp, 289lbft @15psi)
92 se-r (sr20ve with N1 cams DD)
www.cardomain.com/id/cortrim1
post #11 of 35 Old Aug 15th, 2002, 09:37 AM
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Quote:
[i]Originally posted by cortrim1
The turbo muffler bering is responsible for the extra 10hp
What is that? I'm not familure with it

-- 2002 SE-R Spec V
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post #12 of 35 Old Aug 15th, 2002, 09:48 AM
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Quote:
Originally posted by BlackoutSpecV

What is that? I'm not familure with it
Its a failed attempt at humor. If you ask nissan where the extra hp comes from they will tell you the tuned exhaust is reponsible for the extra power.

:thumbup:
02 spec (173.1whp,178.9lbft)retired
94 se-r (342whp, 289lbft @15psi)
92 se-r (sr20ve with N1 cams DD)
www.cardomain.com/id/cortrim1
post #13 of 35 Old Aug 15th, 2002, 11:04 AM
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got it... at first i was like WTF is he going on about then i was like, well i respect his knowledge, so i asked 1/2 thinking it was a joke and 1/2 thinking you had info i did'nt have.

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post #14 of 35 Old Aug 15th, 2002, 11:32 AM
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Quote:
Originally posted by BlackoutSpecV
got it... at first i was like WTF is he going on about then i was like, well i respect his knowledge, so i asked 1/2 thinking it was a joke and 1/2 thinking you had info i did'nt have.
next I am going to install a flux capacitor so I can go 200mph

:thumbup:
02 spec (173.1whp,178.9lbft)retired
94 se-r (342whp, 289lbft @15psi)
92 se-r (sr20ve with N1 cams DD)
www.cardomain.com/id/cortrim1
post #15 of 35 Old Aug 15th, 2002, 01:35 PM
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Quote:
Originally posted by barnoun
Since the Altima uses a 5 speed, couldn't its ECU be installed in a base SE-R to get the 10 extra hp like the Spec V?
No the ECU is different because of the six speed tranny. It won't work in the se-r.
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