[s-cars] RS2 Upgrade Questions

[JR]

Where can I get one of the hybrids you are referring to below?  What are 
the specs and price of said turbo?  How about longevity?  I have heard 
that the Garrets and such don't last like the KKKs do.  Is there any 
truth to this?

Thanks,

JR



Djdawson2 at aol.com wrote:

>In a message dated 1/30/2005 2:47:19 PM Mountain Standard Time, 
>tdfeller at comcast.net writes:
>
>My spin on the upgrades....
>
>  
>
>>1.    Do I have to run a RS2 exhaust manifold? I have no real issue buying
>>one, they are just hard to find and cost big bucks.
>>    
>>
>
>I would highly recommend that you do.  As pointed out by the other response, 
>it is clearly obvious after hard running that the heat distribution of the 
>stock EM is poor... red hot by cylinders 4 and 5.
>
>  
>
>>
>>2.    What turbo should I run? Again, RS2 are somewhat hard to come by and
>>many folks on the list reported good luck with other modified turbos.
>>    
>>
>
>
>RS2's are getting harder to come by, and cost alot.  The RS2 works 
>exceptionally well, and is hard to beat.  There are options, however, in the hybrid 
>world that don't sacrifice low end response.  We've dyno tested numerous 
>Garrett/KKK combos, and have a 50 trim version that is producing excellent results... 
>and cost is lower.  The top end power also exceeds the RS2 by a significant 
>margin.
>
>  
>
>>
>>3.    What changes should be done to the head besides rebuilding? A new
>>exhaust camshaft?
>>    
>>
>
>An expensive addition, with not alot of proof to  back up the cost.  My car 
>made 418/445 last time on the dyno with a stock set of cams, and no head mods.  
>I'd have a stock rebuild done on the head, nothing else.
>
>  
>
>>
>>4.    Do I need to change the injectors? Are the RS2 injectors the best? I
>>know there are a number of companies that offer a range of different flow
>>rate Bosch style injectors.
>>    
>>
>
>You will need different injectors.  I haven't tried any alternatives to the 
>RS2 injectors at that flow rate.  You never mentioned the MAF... I'd use the 
>stock one with the screens pulled, and save the expense of the RS2 MAF.  It does 
>not seem to matter.  I've tested both on the dyno, and neither shows any 
>variance beyond expected single digit hp/torque figures from one pull to the next.
>
>  
>
>>
>>5.    What programming changes are recommended? Can I stay with the MTM?
>>Should I to go with something tuned for the new turbo, whatever that may be?
>>    
>>
>
>Since you've already worked with Steve E, I'd go back to him for the popular 
>hybrid set designed for the RS2 stuff.  It's the same thing that Bob has, and 
>works very well.  I haven't seen anyone making 370hp with it on the dyno, but 
>mine did make 325/401 with all RS2 parts and that software.
>
>Also, while the head is off, I'd suggest installing head studs.  There's 
>great debate about the value of studs... and a lot of inconclusive conjecture.  
>Bottom line, however... I've seen lots of blown headgaskets with stretch bolts, 
>and not one on a car with studs.  At $115 for a set, I consider it cheap 
>insurance.
>HTH,
>Dave in CO
>
>  
>
>>
>>I know this is a lot of questions and there are no real correct answers. I
>>just was hoping to get some ideas for the wealth knowledge on the list. 
>>
>>    
>>
>
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>  
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