Thread: Last Big Upgrade on the Sentra

Well Monday, my long awaited turbo failure occurred (running 20psi daily on a t28, it was only a matter of time). So now I am upgrading .

My list of stuff to get:
Holset HY35 w/9cm exhaust housing
Sard 850CC Injectors (suggestions welcome on this)
Revhard or similar T3 Log Manifold
3.5" Turbo Back Exhaust (might have to start the 3.5" after the dowpipe) with a 3.5" straight through Vibrant flat black muffler
Tial VF44 Wastegate
Ebay Intercooler 27"x12"x3"
JWT S4 Cams

My power goals are 400whp at 15psi, and higher at 20psi. Is there anything I should do to the engine, such as new headgasket/headstuds? Nothing is wrong with my current ones...

I am curious as to what you guys think spool will be with this setup. I'm opting for the smaller HY35 because I want it to begin to build boost failry soon and pull really hard all the way to redline. What are your guys' opinions on this setup, think I will need anything else, or should I change anything? This stuff will be used with what's in my sig. Thanks guys!

Speak with JP as he knows holsets well. Also why the 38mm?

What size is the one for the manfold you have? 44mm? I've only ever had internal gated setups so I'm open to suggestions.

Yea 44mm, Do a search I believe Tekkie, and BenFenner discussed wastegate sizes. The 44mm I believe is just good all around not that it is "needed"

As mentioned before : big turbo with low boost needs a big wastegate to help prevent creep/spike. Big turbo with big boost can use a smaller wastegate since the wastegate won't need to try as hard to keep boost creep/spike away.

Definitions of big/small boost vary, I personally feel that anything less than 1.1 bar is low boost, which is why I chose a 44mm gate on my 30r.

to make that whp at that low of boost u should consider getting the hx35 instead of the hy35, the hx35 spools like a gt30 but has the same r better top end of gt35.
you should also consider in buying a twinscroll manifold to help u out a bit more with your spool

i went hy too. mine should be up this month i hope. should be good. im curious to see other sr holset setups in the works.

Twin scroll isn't an option for me because I am trying to do this on the cheap. I will be doing a full 4" exhaust system (going to be the most expensive part) for future-proofing.

I want to do the HY because of the faster spool (this is a daily driver, and I would like to take it autocrossing/to a track with twisties). If I was building a straight line car, then I would get the HX35 hands down. The difficulty of switching from an HY35 to an HX35 is minimal in case I want to make more power down the road. I would be fine if I was only able to make 400whp at 20psi, and I think that it is doable. The HX35 is bigger, but not by a huge margin.

I have decided on the Tial VF44 wastegate, and a full 4" exhaust (downpipe and all, portions of it will be 4" oval for ground clearance).

I am still up in the air on what injectors I should get. I don't see myself ever wanting more than 500whp, so with that in mind, what injectors would be the cheapest/best for my goals keeping in mind I am running at 4 bar fuel pressure.

I'm also in need of a rock solid manual boost controller, any suggestions?

you technically dont need 4" exhaust to be honest and that can save you money

I would save a couple hundred on the v-bands and mandrel bends, but the exhaust outlet on the turbo is a 4" v-band, so I want to continue that all the way out to the back of the car. I don't want to cut corners on the exhaust.