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Discussion Starter · #1 · (Edited)
Ok so heres the deal, this thread is for all the new 1.8 owners on here who have questions and dont feel the need to do any research. So here you go, a thread based solely on 1.8 Engine, and Suspension parts. Yes, its lots to read but you're going to have to suck it up because researching all of this on your own will take some time so think of this as a temporary cheat sheet.

Disclaimer:
The Qg18de is not a mod friendly engine, meaning that even with every bolt on, youll probably dyno at just under 120whp with a 5spd. Please do not think the 1.8 is a go fast engine because under no reasonable circumstances will it be. :D

Engine:

CAI:
Any B15 (00-06 Sentra) CAI will fit on the qg18de. The only modifications you will need to do is redrill the MAF adapter to fit the QG Maf. This is pretty straight forward, just be patient and youll get it done easily. Jack the car up, take the driver's side wheel off or turn the wheel to the left, pull out the fender liner, put the filter on the end of the pipe. Done, easy. Do not expect huge gains, probably 2-3hp and alot of cool sounds lol.

Header:
As for the header, the only ones I've found recently have been ebay knockoff ones. The OBX is technically a copy of the Hotshot which has been discontinued so OBX is really the best you'll be able to get (on that note, the OBX have been known to have the flex pipe disintegrate over time, but it can be replaced). The headers you're likely to find for the 1.8 on ebay will all say its for a 00-06 1.8 Sentra. This is where the problem starts, the 00-03 have 4 sensors on the header, meaning that there are 4 bungs on the header, but the 04-06 only needs 2 bungs, so therefore, if you have an 04-06 you're going to have to take the header to a shop to have the extra 2 bungs welded shut. Header will also give you a few more hp but once again, dont expect huge numbers. It will make your exhaust much much louder thou, and if you have an exhast you may want to consider getting a bigger resonator to tame the angry bees.

Exhaust:
Ok, so the classic topic. If you want to get an exhaust system there are some simple things to know about it. First of all, your stock exhaust is 1 7/8in dia. which is quite small lol. Biggest you should be putting on your qg is a 2.36in dia pipe. If you want to order a catback, the HKS Sport Catback for the 00-01 SE 2.0 is a direct bolt on to the QG. Its 2.36 in dia and sounds and looks great. Other then that, you can go custom, but keep in mind that you want to stick around 2.25in dia. Anything bigger then 2.36 is way to big and the car will sound like crap. If you have a header installed, you will probably have to consider getting a resonator installed too. FYI, spec-v exhausts are 2in too long for the qg, you could get one but you'd have to chop off 2 in.

Pulley:
So if you were one of the very few luck 30 people who got in on the Underdriven/lightened crank pulley from WRP you are in luck. There are only 30 of them out there (I have one and its pretty good, car doesnt bog down with ac and other stuff on as much). Unless you have a good tq wrench and a pulley puller, take it to a shop to have it done. If you can get your hands on one of these pullies, you'llneed these belts: Goodyear Gator back / GTR-4040320 / 32.0 inches / 4 Ribs, Goodyear Gator Back / GTR-4060420 / 42.0 inches / 6 Ribs, OR Dayco / 5040315 / 31.5 inches / 4 Ribs and Dayco / 5060420 / 42.0 inches / 6 Ribs. The Pulley won't gain you any hp but it does let the engine rev freer and it is noticable.

MMI (Motor Mount Inserts):
MMI's hold the motor in place much better and help to eliminate wheel hop. They are not a bad mod to have, but you will at first feel slightly more vibrations in the car until you get used to it. The main company to get them from is Energy Suspension and you need the ones for the 00-01 SE 2.0. Yes the SE 2.0 ones fit right into the Qg18de mounts, but this is really for Manual transmissions only.

TBS (Throttle Body Spacers):
TBS are really a waste of money mod imo. They provide little to no gains but if you really insist on having one, you can contact nmuk on b15sentra.net and see if hes still making them.

Those are the basic motor mods you can do. Theres plenty more things you can do but they are advanced and are something you need to do way more research on then just reading this thread. Cams are being researched, SAFC II for the best tune, NOS, and Boost are things you will need to do some serious research before jumping into.

Suspension
When it comes to suspension, almost all parts are interchangeable between the Spec-V, the SE 2.0, and the 1.8.

Wheels:
Most 4x114.3 wheels will fit the sentra. For more info, refer to this thread:
http://www.b15sentra.net/forums/showthread.php?t=99430&highlight=18x7.5+offset

Wheel Choosing Advice:
It is impotant to remmeber that the qg has a very limited amount of power, with that said here comes a quick physics 101 to helping yourself out. The weight of the wheel is a very important factor when choosing them. Unsprung weight is a huge efficiency killer, spinning 16lbs is much easier then spinning 25lbs and will take much less power to get it going. Its like trying to run in heavy steel-toe boots, with heavy wheels on the car, it takes more power to get one turn out of the wheel. So therefore, with the qg, it is important to try and maintain stock wheel weights or even lighter to make the most out of the car's power. I can tell you all from experience that when I had my 02-03 Spec-V stock 17's on the car it was much more sluggish off the line compared to the 16 inch steelies that came stock.

Lowering:
Refer to this tread:
http://www.b15sentra.net/forums/showthread.php?t=113874&highlight=springs

Also, Spec-V struts are stiffer then Qg struts, so if you're looking for a slight upgrade, get some Spec-V replacements from KYB or any other company.

RSB (Rear Sway Bar):
The RSB will help keep the rear of the car in check through turns, this is a great handling performance mod. You can do install it in your driveway on your own. Nismo makes the best RSB for the B15 platform because theirs is the thickest one (25mm), with the Eibach (19mm) and Progress(19mm) bar just slightly smaller but still a great improvement.


So that's all I have for now, there is plenty of stuff i left out and if you think something is wrong just post up and lmk. If you have any questions about anything qg related then post them up in here and ill try and answer them:D

 

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CAI:
Any B15 (00-06 Sentra) CAI will fit on the qg18de. The only modifications you will need to do is redrill the MAF adapter to fit the QG Maf.
nice write up man but this can be a little misleading. we absolutely can not use the second gen nismo cai without a safcII or something similar

also ga16 underdrive pullies will work for us too
 

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Discussion Starter · #5 · (Edited)
nice write up man but this can be a little misleading. we absolutely can not use the second gen nismo cai without a safcII or something similar

Huh? Can you explain that a little more? It's the same pipe just with an AEM bypass valve installed. SAFCII is a tuning device, it has nothing to do with how an intake fits onto the car.
 

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Yeah sure, the second gen nismo cai has the maf housing intergated into the pipe itself and while the actual sensor is the same between the qr & the qg the diameter of the tube that the sensor sits in is not (the qr's is bigger) so when you try to put the 2nd gen cai onto a qg your basically putting a qr maf on your car which you can't do without a safcII. The 1st gen nismo cai is fine cause you use the stock maf housing
 

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Hi

Just a few things to add.

Lightened flywheel: Fidanza or AASCO are available at your area for the Nissan sentra 1.8. I have an AASCO for the Turbo 1.8 installed as we speak.

Throttle body: Series 1 can be bolt on with a VQ30DE-K throttle body. Series 2 (with drive by wire?) can use QR25DE since the bolt pattern are the same.

Both the lightened flywheel and the thottle are there for an increase in throttle responce and better pick up. Imo its the best mods ive done so far.

Oh yea

For the lightened pully, if underorthodox are not making there crank pully. There is one in malyasia.

Link: .: MotoRex Performance Pte Ltd :.



And the yummy alutec strut bar.

 
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