Some questions about going FI
 

Hey guys what's going on, I have a 08 g37 6mt coupe which I plan to boost next year. Lot more boosted guys on here that's why I came here to ask. This is my daily driver so not looking for an crazy amounts of power, just the awesome feeling of boost. :excited: So here are my questions, I am looking to make 400-450 whp on the stock block and stock internals. It's going to be the single top mount kit, the same as the one VSR/Vortex Motorsports in Tampa makes. Will I need to upgrade my stock fuel injectors and fuel pump? Will the stock clutch and flywheel hold the power? Will the stock Y Pipe/Mid pipe be okay with a turbo or will there be too much back pressure in the exhaust? All I could think of for now. Thanks! :tup:

Some questions about going FI
 

You'll need new injectors, pump, clutch, flywheel and csc. The exhaust will be a major bottleneck. Not to mention you'll need gauges, a boost controller, an oil cooler, ecutek or uprev and dyno time, plugs and most likely a new radiator. Budget $15k for the full package and an additional couple of bucks in reserve if the motor lets go.

Look into the BP kit. The vsr kit has some really bad decisions the way it's been set up.

Yeah I figured this much. I already have uprev, ecutek doesn't work on my car since its an 08. Going with DW fuel pump and GTR fuel injectors. Southbend quiet disk flywheel and stage 2 clutch. Exhaust will probably have to be custom made. But why the new radiator, even Fast Intentions says they don't have any coolant issues using the stock one. I don't plan to go to VSR. But I will be providing all the parts, I just want the VSR like top mount single kit. Someone else will be doing the fabrication for the manifold, rest is on me. But in all honesty I think the VSR kit wasn't the issue, its the tuner. There are a couple guys on here pushing 600 WHP with that kit and have no issues but they were all tuned by other people. I have done a bit of research on forced induction on this motor and have seen a couple cars being turboed and tuned. To my understanding the reasons these cars are blowing up is due to people that don't understand the VQ/VVEL setup tuning them. Also they are not watching the compression, you need to keep compression as low as possible because with the 11:1 stock compression ratio plus boost is too much pressure inside the combustion chamber, causing internal parts to come loose or break/bend. Fast intentions recently just did a g37 with 80k miles with their TT kit pushing 650 whp on stock internals. The motor just needs to setup correctly.

What Chuck said is the safest route. Do you need all of those items..no. I was making over 500 and never needed a radiator. The stock clutch holds 400. Oil cooler is dependant upon how and where you drive. Flywheel doesn't have to be upgrades unless your going for high numbers. You don't have to have a boost controller but they are nice.

You need to read on here...a lot.

Chuck knows what he's talking about. I doubt you'll save much if any money paying someone to custom fabricate a kit for you.

yeah there are G37 guys running completely stock clutch and flywheel at 450 whp and have been for 20k+ miles. I would do it down the line. I don't think I will running a boost controller anyway, I don't plan to ever go past 450 whp. Oil cooler might be needed considering its a DD and I live in Florida. Gauges are a must because they are cool to look at. :icon17:

Wait.. Why did you make this post??? Your back here answering all your own original questions.

Well I wanted to mostly wanted to know if anyone is running the stock Y pipe and mid pipe mostly. I've never seen any one do that yet, and the injectors and fuel pump. Obviously everyone automatically upgrades these things and was wondering if anyone has done it with the stock ones. Trying to see where money can be saved.

"Going with DW fuel pump and GTR fuel injectors. Southbend quiet disk flywheel and stage 2 clutch" let me rephrase that, I would like to go with these things but I wanted to see if its possible with the OEM parts. Sorry for the confusion

The radiator is because most of us with boosted cars have higher than stock water temps. Gtr injectors are too small.

A top mount is bad turbo placement, but some people have made it work.

The oem parts will not work. The clutch may need to be beefier, and the injectors are too small. Go with 600s at the minimum.

Okay thanks for the info sir. What about the fuel pump? Is 255 lph enough or go for 340?

Some questions about going FI
 

Sure, there are a lot of things you may not need at the outset, but it is always cheaper in the long run to replace parts before they fail.

Go bigger on the fuel pump. Get the 340. Headroom in the fuel system is a good thing.

I'd recommend 750cc injectors too

What do you think is the optimal place for a single turbo setup?

I haven't had any issues with where mine is placed. A typical TT placement with a turbo on each bank is best for sure. Then you start to take the lesser of two evils. I think a low turbo placement is better than placing it in an engine bay that already deals with heat issues. The piping options are a lot better in the low mount too.

Low mount is going to be better. Twins are really better on a v engine from a packaging standpoint, but you have to pull the motor to install.

Keeping a hot turbo in the engine bay of a car with cooling issues stock is a bad idea, not to mention I'm not a fan of how you have to run the hot side piping. Low and out of the engine bay is better from a heat and piping standpoint.

Stock gtr injectors are 570cc, paired with a 255 you will have more than enough fuel for 500whp on gas. (I made over 600whp on a low compression vq with the exact setup). I personally think the stock y pipe and cat back would be fine for 500hp. Obviously there would be benefits on going bigger.

http://i271.photobucket.com/albums/j...psy8b2vty7.jpg

This is from my friend's 370z that was just finished. It made for 500 whp at 7 psi but I am always concerned about dirt going in the turbo or even bottoming out.

Still on stock internals?

That's where mine is give or take a couple inches. Filter protects the intact and the turbo itself sits above the subframe so no bottoming out.

Check out my build thread. It has a lot of detail.

Oh nice I just looked over your thread. Really well done! Can you still hear the turbo really well? I like hearing it spool.

Oh yeah. It's more prominent than in a TT setup. You hear all the spooling and compressor unloading. It's wonderful.

I've had both the top mount turbo using a gt35 and the mid/ bottom mount. Let's discuss heat.

Now I'm not a track star and have barely ran my car autox . With my top mount on the street I had never once overheated with the stock radiator on my 350z. Now to make that even more interesting I added a supercharger to that turbo. It was a pd roots. All smashed under my hood. Guess what, never overheated in summer. Remind you I only boosted from stop light to stop light and on ramps and in open interstate situations.

The bp kit also never overheated on me. I've always had aftermarket front bumpers with huge mouths, both stillens.

Interesting notes, I've always only ran e85.

Also, the bp kit does sound incredible. The spool was awesome. My powerlab gt35 never came close. I don't know if it's the turbo or the placement but bp wins there. The vsr kit uses the same turbo so I don't know how it sounds in the top position cuz I've never heard it in person.

These cars dont need aftermarket radiators. The stock cooling system is perfectly fine for a street car. Not sure why everone swaps them out. One guy probably did so now everyone thinks they need it.

Someone please help the OP out.........he/she is going to be posting about how they are having problems later on if they go through with what was posted previously. I see not much has changed since I have been in and out for a year and a half...........

You better off getting the stillen supercharger OP. for the numbers you looking at and how conservative u tryna get. The stillen surcharger will provide that fun for u and you can keep your car as stock as you want.


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You will need to upgrade fuel pump and injectors ... Stock clutch won't last long plan on upgrading it when it starts slipping and for a turbo setup the less restrictive exhaust will be best.

And what might that be?

:iagree:

You also will need a tune....else you will go KAPUT!

Yes ... Tuning is the critical part ... A bad tune will destroy any motor with even the best part installed ... Also a good wideband afr gauge .. Boost gauge .. That would be bare minimum for a turbo set.

I dont know about the go "Stillen SC" post . yes they will be in the WHP range as the stillen will make 415 WHP or so on a custom tune. But ZERO room for growth( so far) we know that JWillis72 is trying to get his Air to Air straitened out. An the Stillen kit once modded is not reliable. We know I know :(. If I could go back and reuse the 15k I spent I would have waited for a single turbo for the auto's.

An stated above it doesnt matter what your running make sure the tuner and tune is A+.

I said stillen sc because he only wants 450hp max with minimal bolt ons. So boost on a budget, sc to go for what he wants. Boost he'll spend way too much just for the tuner to pull a lot of timing to make it where he wants it.


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You wouldn't have to pull timing. Just run a lighter spring in the WG. I imagine I was running about 450whp on the half bar spring.

That works also.


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Supercharger makes its reliable and have linear power but I am not going to lie, I am in it for the turbo sounds and bov, etc. Not even interested in power gains as dumb as that sounds. LOL :rofl2:

I was thinking the same thing lol.

I have ran both ....and I think the supercharger sounds way better than a turbo application . Louder bov sound and overall a more aggressive sound driving...... If you are comparing sound alone.

I completely disagree and I think one ride in my completely catless turbo car and you would change your mind.

I had a catless 350z with turbo and it didn't sound very loud ....normal turbo sounds with spool and bov ...and that was about 6 months ago

However it was a turbonetics single turbo and it had a lot of exhaust piping so that could have made the sounds mild .....I had a eclipse with a stage 5 turbo on it and it sounded like a jet engine much louder than the 350z sooooo idk lol .....but the gtm stage two kits is really nice sounding supercharger whine sounds awesome and the bypass valve is really loud ....sounds very aggressive.