MarvinMartian

It's incredibly unfortunate that so many of my fellow forum members are trying so hard to crush this young man's dreams.

He sees the future -- a future of internet-auction turbo kits that can be readily adapted to one's car for a reasonable price. Naysayers be damned!

I support you, Dimitris. I support you.

Now, go. Prove them all wrong. All of them! Put that piece-o'-crap ebay turbo kit on your Z, blow the manifold to kingdom-come, and live your life a quarter mile at a time.


Godspeed, hail fellow. We can even overnight it from Japan.

ttg35fort

iTrader: (2)

I just ran the calculations. To reach 400 whp (appx 470 crank hp) on a 3.5 L motor, you need about 49.5 lb/min of air flow for a single turbo at about 0.66 bar of boost. That's a 1.66 pressure ratio.

Now, in the post quoted by St8dum1, it says the turbo is about the same size as the GT2871. Was that referring to the turbo the OP is looking at? (EDIT: I found the post, those are the specs.) If so, let's assume that this turbo will be as efficient as a GT2871 (likely it will not be, but we can assume this is the case for now).

Now, here is the GT2871 map:



At an airflow of 49.5 lb/min. and a pressure ratio of 1.66, the OP will be running well beyond the choke line. At a 1.66 pressure ratio, the GT2871 is good to about 33 lb/min. or so of air flow. The turbo efficiency will be very, very low, and the compressed air coming out of the turbo will be very, very hot. Compound this with the very small intercooler being provided, and that looks like a whole lot of trouble. Detonation likely will become an issue, not to mention you likely will not get anywhere near 400 whp.

OP, when you get the compressor map from the vendor, look to see where 1.66 PR/49.5 lb.min. air flow land on the map. If it is near the higher efficiency zone, then you should be OK with that size turbo (assuming the pressure map is correct). If not, look for a different turbo. If the turbo is about the same size as a GT2871, you will need something bigger to run a single turbo, or you can use two turbos (one for each bank).

EDIT EDIT: This a quote from Garrett's Turbo Tech 3 tutorial:

"The Choke Line is the right hand boundary of the compressor map. For Garrett maps, the choke line is typically defined by the point where the efficiency drops below 58%. In addition to the rapid drop of compressor efficiency past this point, the turbo speed will also be approaching or exceeding the allowable limit. If your actual or predicted operation is beyond this limit, a larger compressor is necessary."

I sincerely doubt a cheap knock-off turbo will even be capable of spinning as fast as a Garrett. In other words, not only would the OP be risking the motor blowing, the turbo will not last long when pushed this hard either.

ashtrojan2008

iTrader: (1)

OP,
I've been reading the thread, trying to keep my mouth shut. But, you seem very sincere about trying to get some answers. Sure it's a cheap kit, and i'd never put it on my "higher end" (not a civic) sportscar. I even thought about getting this kit just to play around and fab it on a 2.4L jeep engine on a dune buggy just for cheap fun.
Can it be done? sure. But the issue I and most of the other people see is that you are not very familiar with engines, turbo systems, or fabrication in general. When looking at this kit, certain things should scream at you that need to be addressed (neglecting the quality aspect. how thick is that piping anyway?)
A) turbo manifold: needs to be fabricated
B) all intercooler piping needs to be fabricated
both of these not big deals. done it before.
C) injectors + EMS
D) is that an intercooler or power steering cooler? seriously? expect 1000000 degree temps
E) you will most likely be missing many fittings needed for running turbo oil lines for your setup.
F) I wouldnt trust that turbo timer/ boost controller or w/e it is on my go kart, much less on my $30K Z. fried electrical system? unstable boost?
G)have fun making that gauge pod look half way descent.
H) Those gauges? maybe on the go kart
I)Fuel pump?
J) how much power do you expect? If you are looking for anything over 375-400whp, and you are going to be spending so much money on supporting mods where you CAN"T go CHEAP, why skimp on the kit itself?
K) you are paying a shop to do this.. what are the fees for shop hour? any idea how long this will take them to fab? its going to cost you more in labor than a nice kit would cost installed in the first place. I could understand doing this yourself for fun, but a shop?
L) expect many other pipes/flanges/etc hooking up your exhaust to the downpipe that looks 1mm thick
Like i said, i'd do this kit for fun on a pos laying around the house. But paying to have it installed by a shop that has no idea about z's is going to be bad, and you will have a blown engine. You think this kit will support your soon to come built engine? Also, as far as looks and reliability, I highly doubt this shop cares about your car as much as you do, and it will probably not be very good work IMHO. I mean are they going to take much time cutting that gauge pod perfectly?
so you're looking at 1k for the kit, about 1k ems, 500 injectors, 100 fuel pump, 500 in random pipes and fittings, thats just to start. Thats over 4k usd. then double that for fab work. Why dont you just buy BoostedPerformance's kit, save money, have EXCELLENT quality? just my two cents. Good luck whatever you decide.

ross

J_350Z

iTrader: (6)

Anyone else notice this tree looks like a female ice skater?

Barnabas

iTrader: (15)

YES

ttg35fort

iTrader: (2)

^^^^

I think that is why he posted it.

Boosted Performance

iTrader: (14)

Soooooo why did you spend $7,000 on a SFT kit then?

Building your own kit sounds very simple. I know that if I was to use ebay parts (turbo/wastegate/BOV..ect) I could build one for about $2500. Or if I used some cheap diaphram pump for returning the oil back to the engine, that is another $200 saved. Throw in some used injectors, used fuel pump, steel piping (very cheap compared to aluminum and stainless) and there ya go.

Maybe one could even do it for $2000. How long will it last and how will it perform? That is something I would not want to find out on my own car. I guess it all depend on what you want as an end result, not to mention the skills needed to do even a half *** job.

If the OP wants to give it a shot, by all means, go for it. He can use my 2 build threads as a reference, I don't really care. I think they are very detailed and have a crap load of pictures.

Ebay wastegates have been tried before...and have failed catastrophically.

ttg35fort

iTrader: (2)

I found the OP's post where he lists the turbo specifications. The turbo is actually slightly smaller than the GT2871. OP, if you want to use that turbo, you need two. Otherwise, look for a bigger turbo.

As others have said, you might also look for a bigger I/C, and get quality wastegates and blow off valves that have proven reliability. If you are going to use a boost controller, get a unit that also has proven reliability. You do not want to cheap out on any of these. It is not worth the risk of blowing your motor by having them fail on you. Also, you should probably get at least 440cc injectors. Run stainless steel piping on the hot side (turbine) and either stainless steel or aluminum piping on the cold side (compressor). In other words, look for a more suitable turbo kit. You will be OK with an Uprev or Cobb re-flash of the ECU if you get a tuner that knows what he is doing. A Utec is another option.

ttg35fort

iTrader: (2)

My gut instinct was that the likelyhood of that turbo being the right size was slim to none, but I had to run through the calculations just to satisfy my own curiosity (and take a break from this patent application I am working on).

I hope for the OP's sake he listens to what he is being told, looks at the data that I have provided that pretty much confirms all of this, and finds a more suitable turbo kit. Otherwise, he is in for a big let down, and likely a blown motor if he really tries to push that turbo to get him to 400 whp.

RudeG_v2.0

iTrader: (1)

It's because those of us with thousands of posts and more than a couple months of membership on this forum have seen this kind of naive foolishness before. You're not the first NOOB to come onto this forum and post that trying some cheap generic/no-name universal turbo "kit" is a good idea worthy of serious consideration. By insisting on doing this, you are showing disregard and disrespect for the collective knowledge base of this community that KNOWS this is a bad idea. You ask questions, but you don't want to listen to good advice.

As Terry (ttg35fort) has pointed out, the turbo isn't even the proper size for a single turbo application on a VQ35 motor. It's apparent, based on your posts here, that the shop you selected hasn't answered your questions or given you good advice. The fact that this shop has zero experience with the 350Z is bad also. A qualified and reputable shop would have recommended one of the proven name brand 350Z specific turbo kits (or a custom made kit using quality name brand components that are proven like Garrett, Tial, etc) along with the proper supporting modifications for FI. A reputable shop would refuse to install the piece of crap eBay kit you insist on using.

So if you insist on acting like a stubborn and stupid fool that thinks he knows better than everyone about this eBay kit, don't complain about the negative responses and comments you get on this forum.

Barnabas

iTrader: (15)

so know that you got real answers noob and cant ***** about the flaming what are you going to do??

jeffie7

iTrader: (4)

The turbo size really doesn't matter if none of the pipes ever meet up. It's gotta get past that stage first.

Rubber water hoses do work wonders for making charge pipes that dont fit work. I know from first hand when I installed a intercooler on my 280ZXT

tonyzS/C03

iTrader: (3)

TRUTH..... i would look for something a little bigger.

dimitris20

DO you expect this kit to have the proper piping??
Unfortunately NO. This was the first good point by Driven1,
Im emailing some sellers to find if they can sell the car specific set (so far they don’t) any hinds?

do you have past experience making/installing turbo kits on our cars??
No, Im not gona do it myself.

Do you know what you are looking for when you get this kit??
Im getting the information right now (page 5 was surprisingly filled up with very useful information)

what kind of turbo is in the kit?? do you know the specs?? is capable of what you are looking for powerwise??
Ive got the specs and so far it looks that it is smaller than what a 3.5L needs . Im looking at 400hp or what ever power is gona produced out of 8psi.

if it fits ten other cars why would you even waste your time buying there kit?? [B]why not just buy 2 turbos from garret and make your own piping?? then at least you wouldn’t be wasting parts that aren’t gonna work.
It does not fit any car , it’s a general kit and since the piping is no good for the 350z Im looking for the correct piping elsewhere

dimitris20

Noted , looks like Ive got many hours of study today and a couple of email to send.

thanks

ttg35fort

iTrader: (2)

See post #82. I ran the calculations for you.

aln

and here is me worrying about 1 or 2 pipes!

Interesting calculations and answers all the same...

DK 350z DK

Is he ganna slap this thing on OR NOT?!?!

OMERTAITALIA

iTrader: (5)

almost a year.....no

bbs350z

iTrader: (85)

your giving us dimitri's a bad name