Time to upgrade the turbos..Is there a turbo shop the will modify my existing turbos and not charge me outrageous sums of money like switzer and other tuning shops?

any plans on upgrading your transmission?

You know I was in the same boat. It is very possible but sadly all the upgrades I have seen hover at the $6000 mark or so. I decided to make my own kit with external gates and manifolds instead. Costs me about same or less and makes more power. You can always just buy a couple of Garrett GT28 catridges and just have any turbo shop machine the housings for you. Make some new lines and you're all set.

This is so much harder/more expensive to do than I think many people realize because of the integrated hot side.

agree 110%, doesn't integration also help with the spool-up times?

The tooling cost to have a local machine shop do this on just one pair of turbos would probably be 6000$ not including the cost of the new CHRAs. Its not something you can do at "Ricky Bobby's Machine Shop and Cattle Feed Outlet" the scroll shapes are definitely a job for a CNC machine.

We've been looking into having a Stock manifold turbo option, but its been taking a back seat to the other hard parts we're fabricating in house.

+1, it's not as easy as you think guys. A lot of CNC machining, and downtime.

Bingo!

Really? I don't see that but you know what? Let's try something. I'm tearing my turbos out. I'll ask my local turbo builder who does CNC machining of housings all the time and I'll get a quote. If anyone wants me to price it out and see what my guy will charge I'll be happy to find out. I don't need my stock turbos anyway. I'll bet you a case of Russian Vodka it won't come close to $5000.

What you are doing is not same as modified stock turbos. I think said that your goal is to achieve 800-900 HP and the turbos you got are surely capable of it, but make no mistake, the results will not be the anything like the modified stock turbos. You will have to compromise the low end in order to gain top end.

Modified factory turbos allow you too keep the stock like response as well as massive top end.

Not as much as you're thinking, a lot of testing has been done between the log style and tubular manifolds on other engines and most engines will gain power across the band with tubular manifolds. Of course you can get crazy and put some 1 7/8th or bigger runners or something and kill all of your velocity, but on quality thought out headers spool time on the same turbo will be lower with the tubular piece.

The difference in lag will come from most companies offering larger wheels in their tubular kits. So far I think even the biggest stock CHRA machining companies are offering are using 54mm inducers, compared to the tubular kit that we (and I believe AMS) will be offering with 57/57 It'd be interesting to see what a comparison between the stock housing upgrades and Boost Logic/AMS Tubulars with a turbo more similarly sized to the 3076WG like the 55/57.

I would preffer to stay with stock turbo housings... I dont see why it should cost more than $3500 to machine and install new internals and that is with a built in profit margin. Am i wrong? I see them for sale for $5500+ ..it would be great business for a knowledgeable machine shop to offer this upgrade and make some serious cash.

Stock turbo housings seem to be a great upgrade at this point. The GTR's a well balanced machine from the start so the more power, the more money you will need to spend in order to dial in this car such as suspension, brakes, bushings, etc! So it all depends on what the driver's goals are. If you just want street, stock housings are the best. Anything above the street please be prepared to not turn back. This $3500.00 you'd like to see is not the only thing you will need, you're missing another 10-15g's in parts + labor.

I was reffering to the turbo mod only at $3,500.

Living It. I should be starting my project VERY soon so I'll let you know what I found out. Just don't forget you'll need:
Walbro GSS342's X2
950cc DW injectors
Forge Actuators
Tuning

Other things to consider is a FMIC upgrade and maybe cams?

Labor is intense though. Motor has to come out.

Very nice..What brand turbo upgrade are you going to use?

I've had a pair of stock turbos modified (compressor wheel upgrade, jet coat, etc) by none other than Blouch with a budget and target to 700WHP. The cost would surprise a lot of people. I will be installing them shortly.

Click to view attachment

can i get a pm on pricing?

Uh Oh!!.... ;)

u know me! just shopping around till u say "pick this one!" haha

Looking forward to your results. Do you mean "surprise a lot of people" as in that is expensive or that is a affordable(sp?)?

Affordable. It really is not very costly to do this procedure at all and you can get cartridges ball bearing for under $800 ea.

I don't believe its the compressor side of the turbo that is costly to replace. It is placing a new wheel and machining the stock exhaust housing/manifold which is more technical/labour intensive.

Are you modifying the exhaust wheel/housing as well? If not I will be interested to see what type of gains you will get from just the compressor wheel upgrade.

Actually it's just machining the manifold. Not that hard just have to set it up for it is all. Profile for the wheel is the same obviously. It is NOT as complicated as dealers make it out to be.

^ What he said!

There are plenty of reputable turbo shops that's been machining stock manifold/back housings to fit larger wheels because their customers are looking for a bolt on solution or even custom wheel trims. Did you change out the CHRA's or just the compressor wheels? I'm thinking about a pair of GT3076R CHRA's

standard 3076's wont fit just to let you know

Any news on the blouch turbos?

Getting them installed soon.

right on Nick!! Can't wait to see your results

Man, Im in for results. Good luck with that and keep us posted.

What does blouch has exactly done?

I think Ill stay with my goal of under 600whp on the stock turbo's.... gets too rich for my blood lol, plus Im not sure the extra power really does all that for me as far as laptimes...I can barely control the thing now

I can't wait to see results as well. My goal is to see what mild turbo upgrades will be able to achieve. My goal is to achieve near 700WHP with a combination of turbo upgrades (actuators too), injector, aftermarket catted downpipes and intake. I think my goals are conservative and I wanted to see what could be done on a budget and keep the car's track worthiness.

I have nothing against those going for highed HP goals through big turbo and much bigger projects, in fact kudos to them for taking on the challenge. Mine was just to see what I can accomplish on my own with inputs from some of the site vendors. I'll write a whole lot more about what was done to the turbochargers (compressor, porting, actuators, ceramic coat) and how I went about picking components. I've been working on this since last Fall when I put the car in storage, so I look forward to sharing the results (whether I reach my goal or not!).

Nickto, I think your thoughtline was very much of a likeness to my own in terms of modded turbos...would be very interested in the results and would you please PM me the financial and key details when you have time.

I will be convincing [no, TRYING to convince] the missis to get another GTR later next year as a second car...if I kind of, you know...smoo-z up to her a little, kind of!!!! Ill just say I will be grumpy without a project to work on so....

Another benefit to consider are the lower IAT's that a larger turbo should produce. Especially in hot climates when running multiple laps.

Looking forward to your results I always enjoy reading your write-ups or watching your video's on the parts you install on your car.

Shouldn't be much longer! The guys at AMS Toronto (amszstore.com, the other AMS shop ) have had the car for a little bit and are putting everything back together so the car can be ready this week.


I've asked Mike @ AAM , who has previously done a custom tune for the car last Fall, to help with a eTune to see what the car can do.

Nick....I think we all demand some pics of the turbos...lol

Nick; I wouldn't rely on an e-tune. Get a reputable tuner to come and tune it on a dyno then the street. There are many people with e-tunes that are still having trouble even with stock turbo setups.

Tuning is not the area to save a few dollars. My 2 cents.

Look forward to the results and cost analysis.

+1....Nick, Tim Bailey is an AWESOME guy to work with and knows his stuff!! I would also recommend the BL FMIC, already proven with the HP goal you have in mind.

Thanks for the input. I agree with you. I currently have a custom tune, and will need to get one for this setup again. I just figure right now I need a tune to accomodate the 800cc injectors and actuators.