[s-cars] What is RELIBILITY MAXIMUS LIMITUS for an old UrS4

[Russ Panneton]

I believe "group wisdom" dictates the RS2 exhaust manifold to ensure safety
for the cylinder 1 and 5 exhaust valves.  At any rate, the stock EM is a
horsepower bottleneck even with a stock turbo.  I've read the stock con rods
are good to around to 450 HP before they start to bend.  Burning holes in the
pistons requires a too lean fuel condition, something that stock fuel
injectors may give you if you run too much boost.  I can't tell you what "too
much boost" is, though!

Good luck!

Russ

On Sat, 29 Mar 2003 21:10:48 +0200, "Bobby Richter" <bobby at lightedge.co.za>
wrote:

>Hi,
>
>I have a stock '94 UrS4 with 186,000 km on the clock and have done the
>following:
>1. Fitted new head, stainless steel head gasket and new valve guides,
>seats etc. (head was cracked - No 5 cylinder)
>2. Fitted RS2 Turbo on standard manifold. (Old K24 bearings went)
>3. Fitted revised Bosch Bypass Valve.
>4. Revised ECU Boost table to max boost of +1.4 bar (20.5psi) then drop
>to +1.35 at 5500rpm and above.
>5. Revised ECU fuel/Advance tables accordingly.
>
>My question is: How high can you go without breaking a conrod, burning a
>valve or holing a piston? Am I being conservative at +1.4 bar or should
>I upgrade to 3.0 bar pressure tranducer and go for more boost on a
>standard engine layout? What is the next logical step?
>
>Cheers,
>Bob

--
Russ Panneton                          russ at s-cars.org
Nederland, CO              "Too bad ignorance isn't painful"