Well after spending some time deliberating I think I may start gathering parts and pieces for my turbo project. I was going to use a
Grang National Turbo, 63 A/F, a 2.75" comp wheel, 1.950" inducer, and a 59mm turb wheel with 18mm blades. TBO372, with a ceramic turbine. The A/R is .82
Anyone have coments on this one? No real goals other than something faster than what it is now. The exhuast should be pretty easy for me to fabricate, as would be the intake connection.
Would the rest of the parts come from the TT setups?
Let me know how this works out. I'm interested in doing something similiar using a GN turbo on my 3.5. Still working out the piping issues. Good luck on this
Well I didn't really consider any parts, this one just kinda showed up for sale for a great price and seemed fairly appropriate. As for the TT versus single turbo debate, I am fine with the slower spool up. I am after a bit of a pissing match so I am after some bigger HP. Plus I just like to be different.
Ok, so The parts list and plans are starting to grow,
Here is what my plans are for gathering parts.
GNX Turbo(1987 TBO372) w adjustable wastegate
Custom Downpipes
2.5 inch exhaust with high flow Cat, rsinator and Magna flow exhuast
Spliced single O2 sensor
TT ECU
TT Fuel Pump
My plan was to use 2.5 inch SS Mandrel bent Downflow into a 2-1 collector under Passenger side of the engine, then up to mount the turbo near the Passener shock tower(Slight hood modifcation may be required)
2.5 inch down from the turbo back to a stockish location behind the engine and straight back to a shorteded side exit exhaust, piggy backing the Flex pipe, cat resinator and exhaust side exit tip in front of the passenger rear wheel well(or maybe just straight back)
Upgrade the Radiator to the larger TT radiator
Oil Cooler(required???)
Oil housing from a TT, Oil cooler lines will be custom as well
SAFC2
Boost, exhaust temp guages
Airbox and connections will obviously be hand made as well.
As for the fuel injectors, I was figuring on the 360cc injectors with resistors, as the GN's use 40 pound injectors I figure they will be a good place to start, (360 cc, is about 34 pounds), if anyone has a better idea let me know. Maybe Gn sized 420cc or so injectors woul dbe a better starting point.
Anyway, this is just the start and likely won't happen for a while, turbo this month, misc parts next month, maybe start fabricating in a couple months....
Anyway, if anyone can help me out with used parts that I may need or anything I am missing it would be appreciated. I have turboed a few other cars in the past, but not a stealth.
Last edited by jedimastermopar : 06-30-2009 at 10:42 AM.
1000+ at peak, but to my understanding the stocker GN's didn't run anywhere near 1000hp. Also the turbo was built as a fast spooling larger turbo with lightweight internals. I am not set on that particular turbo, just thought it would be appropraite. I'll keep my eyes open for the one you mentioned. I can't seem to find any info on it, does it goe by a different name? Are there any more suitable donar cars to find single turbos from?My budget will likely only allow a rebuilt donor turbo.
brent was trying to let sully know that he recomended a turbo that is not appropriate for your build according to what you have said thus far.
stock injectors should work for you. but if you go with the larger injectors you will get a little more timing bump from the ecu. however i would go with a higher flowing fuel pump than a stock tt pump just to be safe.
i dont see a rising rate fuel pressure regulator in your list. you could use a manual boost controller to keep costs down.
a wide band and a data logger would be a valuable investment.
are you going to custom fabricate exhaust manifolds? 2.5' from each bank on the way to the turbo is pretty large; likely overkill that will lead to lag.
good luck
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11.4 @ 125 w/DR500, DR Stage III heads, 50 Shot, Weight reductions, and no traction.
I was going to use the stock NA manifolds and fabriacte 2.5" downflow pipes to the turbos. Should I use the stock size? Won't really have the loot to do headers. maybe later though.
So would you say the turbo I am loking at is good or not good?
My current o2 sensor is buggering up, if I put in a wideband o2 sensor on the current stock setup will that through things off?
Manual boost controller is the most likely scenario, How much flow in the fuel injectors and fuel pump should I be looking at? Can I just add an inline high flow fuel pump? If not what pump should I be looking at?
Didn`t think about a fuel pressure regulator.
Basically I am looking to start off with minimal investment in a bare bones budget single turbo additional where I can generate some decent boost and then add on all the other stuff later as I go, and as funds come in. An initial investment will obviously be required, just trying to keep it down. I don`t mind doing things twice as long as the first time it works and the second time makes it better.
ok on the na manifolds but 2.5 from there to the turbo seems too large. ill let some other people chime in who have more experience building custom kits. if you wrap the exhaust before the turbo it may spool a little faster although if your exhaust sizing is correct you really shouldn't lag.
you still need the narrow band oxygen sensor for the computer. however as far as gettting a solid af ratio reading accross the rpm band goes they are not accurate. since you will have to tune this car for wot, and you cant safely tune without data, it would be a good idea to get a data logger and wb. at part throttle your stock tt ecu fuel trims will handle most of the tuning, you just need to get your safc corrections in the ballpark (if you use injectors larger than stcok 360cc) and you'll be set.
the fuel pressure regulator needs to be in your bare bones initial build. the car needs to be able to add fuel when boost increases.
fuel needs depend on turbo selection and your goals. turbo selection is important. if you buy a turbo that is too small for your end goals you will not be able to add suporting mods to really make much more power. it would be better to buy a turbo slightly larger than what you can support fully boosted now, tune it to lower boost, and then the supporting mods can be added and will pay off later. supporting mods are just that, they support the turbo they do not generate lots of power on there own. only so much air can flow through the exhaust turbine and now supporing mod is going to change that nor will they change the compressor map of your turbo and allow it to run more boost (for the most part, obviously heads would allow more power at same boost or or same power at less boost but heads are $$$).
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Single Turbo project
