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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 11-06-2009, 02:56 PM   #1
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Upgraded T7 turbo

Anyone know anything about upgrading the turbo on a viggen. Cost, style, etc., let me know
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Old 11-06-2009, 03:07 PM   #2
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More to it than that. How much power are you looking for?

Do a search on the subject. If you want 300whp plus you also need to replace the pistons for peace of mind. That just went from a little project, to a BIG one.
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Old 11-06-2009, 05:33 PM   #3
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I really am no expert on this subject, however I know that you can upgrade the turbine wheels on the tdo4 15t which t7 viggens have. You will neet to send out the turbo to be balanced etc... Also, often people will upgrade the turbine housing with the Aero version as it allows more flow. Long story short, you will need to pull your turbo and send it away to be upgraded and balanced rendering your car useless untill it returns. Or buy a cheap TDO4 turbo which already needs rebuilding and send it off to get the turbines upgraded etc.... If you are interested in buying a unit to send out I have one which I took out of my 99 viggen which has a destroyed exhaust turbine and shaft. There is no damage to the housing etc... perfect candidate for an upgrade. Let me know if you are interested.
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Old 11-06-2009, 05:48 PM   #4
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Just wondring what killed your stock turbo, THAEDGE. I have 135k on my 00' TD04 with 5,000 of those at stg. 3. Wondering how much is left in the Mitsubishi. Sorry I'm not helping the OP but, this has been covered before. Im thinking you need to send a PM to Chadwick. I hear he has done great things to turbos.
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Old 11-06-2009, 06:45 PM   #5
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The most common upgrade is to the 18t wheel, but the 5cm2 exhaust housing isn't the best to do that. The 9000 Aero TD04 featured a 6cm2 exhaust housing which obviously has better flow. I think injectors are needed for the 18t, and you really should consider forged pistons.
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Old 11-07-2009, 06:49 AM   #6
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On an 18t, you do not need pistons, sure they are a great upgrade, but just get a tune with a safe amount of torque/HP (Keep whp under 280) and you will be fine. Just make sure your car is in perfect tune. Get seimen 60 lb injectors, a better cobra pipe,a tune, etc and you are off. If you can, get a road tune that you or the tuner can adjust over a few days so you can get it perfect.
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Old 11-07-2009, 11:44 AM   #7
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Quote:
Originally Posted by NH99Viggen View Post
Anyone know anything about upgrading the turbo on a viggen. Cost, style, etc., let me know
Check my thread on turbo and the previous disscusions on trubo
If you stay stock with the engine, TD04HL18 is the most.
For TD04HL119 with the 6cm^2 exhaust and up (GT BB28 or GT3071, or even Holset), meaning over 300 HP, you need forged pistons (just in case).
And for any turbo above GT28, you need a different exhaust manifold, another downpipe, thiner fan, s.o.
My advise: search for a TD04HL18 and be done with it! (280 HP)
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Old 11-09-2009, 09:40 AM   #8
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I never realized viggen bottom ends were that fragile considering some seem to dyno 230whp...
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Old 11-09-2009, 09:47 AM   #9
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Quote:
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I never realized viggen bottom ends were that fragile considering some seem to dyno 230whp...
The bottom end isn't the issue, it's the pistons. If you are going to pump out over 300hp on a T7 car those fancy stock pistons like to melt. Other then that the engine internally is good to go. The only thing to manage is air and fuel as you bump things up.
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Old 11-09-2009, 11:43 AM   #10
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Quote:
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I never realized viggen bottom ends were that fragile considering some seem to dyno 230whp...
The bottom end itself has seen 500+hp. As it's been said, its the pistons. But approaching 300whp is plenty for a FWD car. I bet there are plenty looking for big power that still have open diffs too. For balance, 270whp and an LSD with the right tires and suspension will make for a solid car.
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Old 11-09-2009, 12:09 PM   #11
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more or less any kind of bigger turbo upgrade will require forged pistions....unless you get your hands on the B234 out of 94+ 9000's. That entire motor will handle 400+hp stock and be happy about it. There 99% direct drop in for the viggen.
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Old 11-10-2009, 06:13 PM   #12
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Yeah, when I got my viggen the engine was seized because it was one big block of sludge, we're talking taking a chisel to the oil pan and still not being able to remove all the gunk. I can't even explain the consistancy of what was caked to every engine surface, it's amazing the PO was able to drive it as long as he did. So that ended up killing the turbo too. I used a
B234 bottom end from a '96 9000 turbo which uses the bullet proof pistons, and replaced the turbo with a used one with 40k on it. In the end I got myself a 99' viggen with a fully rebuilt motor for a very reasonable price.
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