[s-cars] IA vs MTM......This is Ned Ritchie's input

[Peter]

Reading this as I see it, difference of 3-bar = more boost in midrange

Caveats:  clean or replace WGFV, run premium fuel (93), make sure your turbo
is in good condition.

Sounds good to me.  I'm at sea level, my turbo is fine (knock on carbon
fiber), and 93 gas is available at most stations here- it's what I use all
the time anyway.  I appreciate that Ned is a bit more conservative on his
ignition mapping and may have smoother power delivery but unless things have
changed, he will not provide the III+, only the III.  Has this changed?  If
it has I'm on the fence 'til I hear more from others (and a price).  If it
hasn't I'm in for the MTM 1+.

Peter

On 6/17/02 4:33 PM, "chris chambers" <fastscirocco_2000 at yahoo.com> wrote:

Snip<<<<<<

>> Expected hp & other results/issues from IA S4/S6
>> chips:
>>
>>
>>
>> IA Stage III
>>
>>       Approximately 277 hp
>>
>>       No known issues
>>
>>       Conservative safe enhancement
>>
>>       Best for longevity and reliability
>>
>>       Does not push the limit of the small turbo
>>
>>       Will not by itself damage the turbo
>>
>>       Best for high altitude (safer compressor
>> pressure ratios)
>>
>>       No detonation on premium pump gas
>>
>>
>>
>> IA Stage III+ and Hoppen Stage 1+
>>
>>       Approximately 277 hp (MTM 1+ chip label says
>> 265 hp)
>>
>>       Requires a 300 kPa pressure transducer
>>
>>       Digital boost display on 1992 S4 inaccurate by
>> 20%
>>
>>       "Fuel/Timing" & "Boost" chips for III & III+
>> are different
>>
>>       More midrange boost plus ignition timing at
>> detonation level
>>
>>       III+ boost pressure higher than III only in
>> mid rpm range
>>
>>       Pushes the limit of the small turbo
>>
>>       Potential for damage to marginal turbochargers
>>
>>       Detonation on warm days
>>
>>        MTM's detonation more severe than IA's with
>> its reduced timing)
>>
>>       If Wastegate Frequency Valve is sticky
>> possible excessive turbo
>> rpm
>>
>>       III+ peak hp the same as Stage III peak hp
>>
>>        (IA & MTM reduce the boost above certain rpm
>> to stage III level)
>>
Snip<<<<<