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Old 08-13-2005, 11:51 AM   #1
projectrally
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Default My 99RS-T...returbo, or back to NA?

Okay, the real quick story. I've got a 99RS-T. It's got a VF-10 running 7lbs boost, and making some pretty good power. Or, i should say, it WAS. Now it's pretty well spent. The factory headers were kept, and all the turbo plumbing was custom back to and including the catted midpipe, which stopped in the stock location, allowing me to bolt up my Greddy Evo 2 catback.

As it stands, the car's got 157,000 miles on it, and has been turbo'd for 120,000 of those miles. The turbo just died, though, and the plumbing's pretty well worn. So now I need to do something to get my car running happily again. I'd like to do an engine swap, but I really don't have the time or resources to do that right now, so I'm basically looking at one of two options:

1. return the car back to NA. I've got the stock injectors still, and I could source enough used parts to put the thing back to stock pretty cheaply. Pros: cheaper from a parts standpoint, cheaper from a fuel economy standpoint, likely to increase the lifespan of the engine over keeping it turbo'd. Cons: um...no turbo.

2. replace turbo and all turbo plumbing. If I do this, I'd like to future-proof the purchases, so that any of the plumbing I buy can be swapped over to the new engine when I swap that in (probably sometime next spring or summer). Pros: get to tinker with the car all over again, setting up the new turbo setup. Get to keep enjoying the added power of the turbo. Cons: more money that could go into the swap, reliability issues of putting a turbo on a car with 160K...

So really, the big question: is it worth it to re-turbo a car with miles that high? I'll tune conservatively, of course, and probably just go with a TD04, since it's so similar to the VF10, looking to keep power output in roughly the same area. But, will putting a whole new setup on a car with that many miles be safe, or should I just suck it up, go back to NA, and save the money I would have spent turbo'ing the car for the swap?
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Old 08-13-2005, 12:11 PM   #2
Master2192
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If your worried about the motor. Replace the turbo and plumbing. And replace the block with an STi shortblock.
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Old 08-13-2005, 12:13 PM   #3
JonofScio
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what's wrong with a car with that many miles?

A car with 50,000 miles on it is not that far detatched from a 200k mile car except for the condition of the running parts... they can always be replaced.

I would go back to N/A, save up the good parts and what you can salvage, put together a good motor and go for it.

Idea 1: Resleeve your block. The n/a block has better cooling (duh) becuase of the bigger passages, and sleeved with steel will of course hold more power.

Idea 2: Just go grab an STi shortblock, and piece back together your turbo kit.
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Old 08-14-2005, 08:43 PM   #4
Mariano
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I was in a similar situation as you (without the 100K plus miles) and I decided to:

1.-Dalton sleeves on the RS block
2.-Forged pistons and rods, lowering compression to 8.5
3.-800cc Injectors (from 420)
4.-GT30R Turbo with modified old up-pipe/down-pipe
5.-Ceramic coated old plumbing

The STI shortblock in my opinion is not an option if you can sleeve your current block... it ends up beeing around the same $$$


just my .02 cents
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Old 08-15-2005, 07:29 AM   #5
projectrally
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So if the costs are roughly the same, why is the STi block not an option?
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Old 08-15-2005, 09:07 AM   #6
Mariano
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Quote:
Originally Posted by projectrally
So if the costs are roughly the same, why is the STi block not an option?
Because the STI block won't hold boost like a SLEEVED block.
You can push 30+ psis on a sleeved block (with excellent fuel management); if you have cylinder failure you can always replace one sleeve instead of the whole shortblock.

There're a couple of guys here in PR that are running in the 10's (1/4 mile) with sleeved blocks; otherwise it would be hard to impossible get there without sacrificing the block.

I just think that a sleeved block with forged internal will have a better safety margin even if you're not planning on running more than 25 psis...
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Old 08-19-2005, 08:22 PM   #7
White 2.5rs
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an sti block will do just fine there are plenty of people using it to get into 11s and some 10s

and the whole better cooling thing...theres like no real difference between the 257 and the 253 or whatever the suffix number is other than a siamese mate and like one other little strut on each cylinder, nothing to worry about i mean maybe 5% of overall flow is changed

alex

Last edited by White 2.5rs; 08-19-2005 at 08:32 PM.
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