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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''' * big intercooler with opposite direction air flow, by-pass in new location and drilled intake manifold. * Intake: AEM 4" air filter * original K24 7000 turbo ** I recommend some uptodate turbo design (garret ?) not K26/27 like MembersPage/MarcellGal/PowerAndTraction where turbo wakes up a bit late (above 4200 RPM in gear 2) for the power (406 Hp) * Exaust: RS2 manifold, wastegate wiht stronger spring (old 10VT audi one), stock downpipe, straight through pipe to last original silencer. * Fuel: stock fuel pump but modified elecrical system, mallory FPR. * Gauges: VEMS Round WBO2 and EGT (2mm EGT sensor, RPM input, analog input for boost, analog output for stock ECU NB lamda), boost. VemsAudiAan shows a straightforward wiring recipe for this engine, wether * using motronic ECU ** still needs some wiring, eg. WBO2 * using v3harness * or building custom harness ** best fit, but most work and likely the most costly as well for ignition upgrade, you can either go distributerless, eg.: * apply a 2x2 wasted spark module to drive ign2,5 and ign3,4 like MembersPage/MarcellGal/PowerAndTraction (ign1 driven by factory ign transformer) * apply AAN-type ignition: power output stages + transformers ** or without power output stages, just the transformers (driven with power "IGBT" output, of course) * use 5 logiclevel COPs (not recommended, these COPs don't live long in high performance engines) * or use 1 channel CDI and keep the distributer (make sure it is positioned well, especially if using ALS - not recommended though) '''The most appropriate ECU''': * assembled v3.x * 6 IGBTs + 2 logiclevels ** write in the order note: "255 Ohm logiclevel output" to allow even for the (otherwise not recommended logiclevel COPs) ** with the 4 stepper channels, this allows up to 6 logiclevel and 6 power outputs * no 1 wire * 30V flyback * primary trigger=VR * secondary trigger=auditrigger * 300 kPa internal MAP sensor ** or 400 kPa, but without serious internal engine upgrade higher than 1.8 bar boost is not feasible anyway * no screws (easier to mount in the audis without screws) ---- '''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:''' * Need to change the 2mm EGT sensor with 6mm one. ** especially if the sensor is before the turbo (although I guess it is after the turbo, in the manifold in the factory place) * Bigger MAP sensor for boost logging. * Change the ingniton system and eventually VEMS ecu (this takes for some time). ---- 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
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