Scott's Altima Coupe 2.5L Turbo Build

[JDRosenberg07]

Okay so I'm new to turbos.. I know the purpose of a BOV/diverted valve but what is the difference between the two?

Also do you have any turbo lag? How's the power curve throughout the RPM band? Do you hit peak tq earlier or is that still the same too?

[brokendan]

if by diverted valve he means a bi-pass valve then it recirculates the air the would have been blown off and released to atmosphere, back to the turbo intake. where as a bov just releases the pressure to atmosphere. and if he has an hks style bov, hks has a recirculation kit for the ssqv that i believe should fit. but as is.. our cars shouldnt suffer from a bov vented to atmosphere like a car with an afm. but i could be wrong.

mad props on this btw. if i didnt like my coupe for the fact its my reliable car, i would be attempting this with my cvt lol
Modified by brokendan at 11:27 PM 1/18/2010

[Ranga14]

lol @ money for a backup engine, that's A LOT of backup money.

[QR25DE]

Okay so I'm new to turbos.. I know the purpose of a BOV/diverted valve but what is the difference between the two?

Also do you have any turbo lag? How's the power curve throughout the RPM band? Do you hit peak tq earlier or is that still the same too?

Constant from 2000rpm +. Honestly you can't base your turbo setup on mine if you're planning on doing it. Different turbo, piping route, tune will yeild you different results, but it's constant effin power lol. The motor doesn't even seem phased by it, not burning any oil whatsoever. It's enjoying it as much as I am lol.

Proper elbow from the turbo to the IC piping is now installed. Originally we used a canadian tire plumbing fitting. I'll grab a full picture tonight of the engine bay since it's kind of cleaned up. Going to try and notch out the engine cover plastic and get that back on there as well if I can manage it.

[ESP]

Originally we used a canadian tire plumbing fitting.

Ahhhh Canadian Tire...what ever would we do without that glorious, GLORIOUS institution? lol

[mcheddadi]

man my bro has been rapping the canadiantires all around the house since he got a supra. they got tons of parts for old cars but nothing for anything recent that isn't a van or a camry lol

[QR25DE]

I have so much Canadian Tire money it won't fit in the center console top piece anymore. lol.

[ESP]

That's hilarious! Yeah, I've got a stack that's just over $120 at last count...

[Blackmobile]

yeah we all have that wad of canadian tire money laying around, do they really expect us to remember to bring that stuff in when we go to the store? i think they know that we'll never redeem it, it's a conspiracy i tells ya!

[Dest556]

I have no idea what the hell you guys are talking about. Terrorists.

[Zerep]

wiki is your friend damn canadians and their secrets http://en.wakopedia.org/wiki/Canadian_Tire_money

[ESP]

I have no idea what the hell you guys are talking about. Terrorists.

[JDRosenberg07]

So how's everything holding up and running now that yougot it tuned? Any problems with the stock clutch holding the extra power?

[QR25DE]

So how's everything holding up and running now that yougot it tuned? Any problems with the stock clutch holding the extra power?

lol, everything is totally fine except the clutch. Well technically, the clutch is fine... just really hard pulls burning the tires in 3rd on a hill is a bad idea with a stock clutch. I felt it slipping.

*Waits for a company to make an after market one*.... do do do. MAF is moved to IC piping and the BOV is in the front bumper now. No more stalling and the BOV is loud as hell now lol.

[blackteam02]

loud BOV FTW!!!drive-by vid?..yes please may i have another.

[JDRosenberg07]

If you do end up dropping the transmission to replace the clutch you should get the HLSD from the sentra like mehdi did. And I thought there was an aftermarket clutch available for the A/C.. I could be wrong tho.

And is there any chance you'll make some more videos? Like a 0-60 or something? Lol

[Nlghtmare]

Congratulations on the finished product. I'm extremely happy that you've completed this after all this time. I've read about it since September and finished in December.

I do have an interesting question though. A mechanic at a local tuner shop believes that a turbo set at low suggested psi of four to five said a turbo set up is more than possible on a 2.5 CVT. Second opinions? This is NOT the first time I have been told this from MECHANICS. We all know about the one QR25DE owner with CVT that blew his transmission. Remember though, we hardly got any information out of him and he was running a large shot and boost with high psi.

If not possible does anybody think two to three psi would hold up on the QR25DE with CVT? This question is mainly directed to the thread creator because I'm not trying to thread jack! I would be happy with even one psi but I know some people will say it's not worth the money for such low psi but I really don't mind as long as the CVT will hold up.

Congratulations and have a fun safe ride.

[Zerep]

The question is not really psi cause boost is boost it more of how much torque can the cvt handle before it starts to slip and ultimately fail those figures should (out there I mean I would be happy as hell with 210whp but that would be like 250hp to the crank and I'm pretty sure that's pushing the limits

[QR25DE]

I can't say it will or will not work properly. There are some people with the CVT on here with the 3.5L running more than 3psi. It will hold up, but the question is for how long. Some people have had issues with the CVT N/A so it's the chance you take.

Money VS HP / PSI is something I would think about.

I think, for all the wasted time, crappy parts, etc. I still came ahead in that department.

Is it worth it to run a really low boost setup? IMO, no. If you're going to spend all the money to do it, make it worth it. If I was just going to run 3psi all the time then I wouldn't have bothered. 7 is a great starting point, but the CVT is a bit iffy. I would talk to some others that have the CVT and Turbo to see how they like it. There are a few vids on YouTube of CVT and Turbo. I haven't heard of anyone wrecking it yet except the white 2.5L.

[Liencouer]

There are some people with the CVT on here with the 3.5L running more than 3psi. It will hold up, but the question is for how long.

I think I recall somewhere that the 2.5 and 3.5 have different CVTs. YMMV though.

[QR25DE]

I think I recall somewhere that the 2.5 and 3.5 have different CVTs. YMMV though.

Actually, I believe you're right. Still fails. lol.

[Nlghtmare]

There are a few vids on YouTube of CVT and Turbo.

Could you point me in the right direction?

I believe you said that before realizing that the 2.5L has a different transmission than the 3.5L.

[QR25DE]

Could you point me in the right direction?

I believe you said that before realizing that the 2.5L has a different transmission than the 3.5L.

Yeah ur right. Only vid on Youtube is of the white coupe with cvt and turbo 2.5. Although the videos don't show anything interesting and he hasn't been back on the site in weeks so come to your own conclusion...

Anyways if you do it you will be the first CVT 2.5L WORKING lol.

1. Mehdi - 1st HLSD.2. Me - First 2.5L Altima Coupe Turbo (Manual)3. Nightmare - First 2.5L Altima Coupe Turbo (CVT)? lol hahaha.

I'm sure we could make a list of firsts on Nico.. actually... I'm going to create that topic right now...

[Zerep]

The problem with testing the limits of the cvt is fact that it being as fickle as it is turboing it to 5psi could last years to one person while in my hands it wouldn't last a day cause of the way I drive I got 30000 hard miles on my coupe and havnt had a single problem with my cvt and then there are people who take it out of the dealership and are starting to have problem 1000 miles in the only way we can be sure is if we try I rather have a supercharger from stillen with their engine and transmission warranty it won't give you as much power as a turbo setup but I think it will be safer

[QR25DE]

PHOTO UPDATE:

Ignore the salt and intake for the turbo, it's temporary and if it's not it'll get painted lol...

[ESP]

OH GAWD YESSSSSSSSSSSSSSSS!!!!!!

[JDRosenberg07]

Nice man.... so are we ever gonna get a real 0-60 vid or some dyno numbers?...lol Im pretty sure you have paved the way for the 2.5s to turbo now.. congrats man

OH GAWD YESSSSSSSSSSSSSSSS!!!!!!

[QR25DE]

Nice man.... so are we ever gonna get a real 0-60 vid or some dyno numbers?...lol Im pretty sure you have paved the way for the 2.5s to turbo now.. congrats man

Thanks, yeah getting to a dyno is tough in the middle of winter / snow. Probably won't happen until spring. I'll see if I can get another video made on Tuesday on my day off.

[Nlghtmare]

The problem with testing the limits of the cvt is fact that it being as fickle as it is turboing it to 5psi could last years to one person while in my hands it wouldn't last a day cause of the way I drive I got 30000 hard miles on my coupe and havnt had a single problem with my cvt and then there are people who take it out of the dealership and are starting to have problem 1000 miles in the only way we can be sure is if we try I rather have a supercharger from stillen with their engine and transmission warranty it won't give you as much power as a turbo setup but I think it will be safer

Great point(s) but unfortunately Stillen is not working on a "sc" for the Altima Coupe 2.5L anymore. I E-Mailed Stillen recently and they have decided to stop that idea.

[QR25DE]

I'm bored with 7psi, someone run 10psi on theirs and let me know how it holds up. K thx.