MembersPage/RandoNomm (2009-03-11 14:31:13)

Hello, I own 1991 Audi S2 coupe with 2,2L 5syl 3B engine, and my main goal is to make it run on VEMS and get power between 350-400BHP. Right now my best ET at 1/4 mile is 12,82 seconds.


Engine

VemsAudiAan shows a straightforward wiring recipe for this engine, wether

for ignition upgrade, you can either go distributerless, eg.:

The most appropriate ECU:


Chassis

Brakes: 4x zimmerman discs, ferodo brake pads, Motul RBF600 brake fluid. Front brakes are waiton for upgrade, alredy buyed wilwood 4 piston calipers and audi A8 320mm discs.

Suspension: 4x kony yellow shocks, original springs are wating for lowering ones.

Body: The car got new paint a year ago, for better cooling it has modified RS2 replica front bumper, a little wider rear bumper, loesed lower door covers, tinted windows.

Other: 034 short shifter


Plans:


Turbo update is already in my plans, garret GT3071r i think, but all this comes with VEMS ECU.

The EGT sensor replacement is becase it is now in manifold, wiht old manifold it was after the turbo.


Today I started to "play" with boost logging option.

First i needed to measure voltage @ different pressure points (yesterday i had one not wery precise gauge and I measured only two points @ 150kPa and @ 200kPa, from them I calculated all other numbers).

At athmospheric pressure it shows 2180 mV, @gauge 1300

@ 0kPa - 0mV @gauge 1038

@ 10kPa - 191mV @gauge 1064

@ 20kPa - 412mV @gauge 1090

@ 30kPa - 633mV @gauge 1116

@ 40kPa - 854mV @gauge 1143

@ 50kPa - 1075mV @gauge 1169

@ 60kPa - 1296mV @gauge 1195

@ 70kPa - 1517mV @gauge 1221

@ 80kPa - 1738mV @gauge 1248

@ 90kPa - 1959mV @gauge 1274

@ 100kPa - 2180mV @gauge 1300

@ 110kPa - 2401mV @gauge 1326

@ 120kPa - 2622mV @gauge 1353

@ 130kPa - 2843mV @gauge 1379

@ 140kPa - 3064mV @gauge 1405

@ 150kPa - 3285mV @gauge 1431

@ 160kPa - 3506mV @gauge 1458

@ 170kPa - 3727mV @gauge 1484

@ 180kPa - 3948mV @gauge 1510

@ 190kPa - 4169mV @gauge 1536

@ 200kPa - 4560mV @gauge 1585

With disconnected analog in (4V) shows gauge 1529 and to ground 1040

Today I bought one precise boost gauge (vaacum/boost was very expencive) and i'm going to measure all points, seems how precise my calculations where.

Settings ate: linear curve, calibration is 255, offsett is 0

Now I'm trying to figure out how to make gauge in megatune show me pressure in kPa, loggign option already almoust works.

Formula what I'm using is value - 1038 / 2.62 = X kPa