[s-cars] Lehmann vs. MTM (was: MTM Stage 1+ AND Pinging AND Hot Weather)

[Cody Payne]

Hey Brian,
	Not too familiar with the Lehmann chip..but I hear the power is more linear vs. the on/off nature of the MTM+ (Which I have)  As for the pinging..I only hear it on HOT days and when the car has been sitting at a stop-light and you get up in to 2nd-3rd gears WOT (Full Thottle)  I also live in Denver.
See comments below:

"The MTM 1+ runs the car very lean at part throttle and it the transition to
full throttle.  Light detonation is common in the conditions you describe.
The IA III+ (Lehman chip) timing chip runs richer at transition and I've
never seem this problem with it." - Robert Pastore

"Yes, MTM 1+ has a somewhat aggressive timing map. Our cars need better
intercoolers and/or water injection BIG TIME."- Igor Kessel

"Bigger injectors and an adjustable fuel pressure regulator would help your
problem..." - Hap

Hope that helps

cp

-----Original Message-----
From: Brian Powell [mailto:brian at atomicham.com]
Sent: Friday, August 16, 2002 10:03 AM
To: s-car-list at audifans.com
Subject: [s-cars] Lehmann vs. MTM (was: MTM Stage 1+ AND Pinging AND Hot
Weather)


Greetings all,

I am preparing to send in my ECU via the GP for either the MTM+3 bar or the
Lehmann.  After hearing about the pinging issues with the MTM, I am curious
as to what experience the listers have in Lehmann and MTM.

I realize that everyone has different priorities for the chips they are
after.  I have a 97 S6 which is used for non-track driving, highway cruises,
etc.  I will be putting in the Samco hoses and the engine checks out
(leak-down tests, etc.).

I want a decent kick in power without having to resort to RS2 components
(maybe in another couple of years); however, I live in CO where the
elevation makes the air lean and we can only get 91 octane fuel.

I have searched the list archives and the web and have not found direct
comparisons of Lehmann and MTM+ (in fact, I can't find the performance
numbers of the Lehmann anywhere).  Most of the Lehmann information I have
found is in regards to the 200t.

I had researched the MTM+ and thought it to be perfect for my needs;
however, if the car is going to be pinging up and down the road, I am
concerned.  Is the pinging issue only applicable in very hot weather?  Is it
rather uncommon?

What words of advice can the list oracles provide?  Thanks!

Cheers,
Brian

97 S6
90 90Q20v
96 A4
& misc non-audi honda...

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