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Took new setup to track yesterday (427W NA) and data logs show the RPM line to be vary jagged by as much as 300 RPMs between frames as it climbs at WOT in 3rd & 4th. 4th was smooth enough while on the dyno. Is this simply the result of drivetrain, suspension, and tires 'squirming' under...

Working on driveability with a large cammed 427. I grasp most of the tuning principles as Ive gotten my other two comobs worked out but this big cam and big motor is a different beast. Biggest issues are bucking/hesitating on throttle inputs. And, some really bad "trailer hitching" in...

Got a 427 sbf with large hyd roller (242/254@.050, 585/585 112LS). Running FAST Classic. I can get it to idle at about 1250 but slightest closure of TB blade sends it hunting badly. A rough idle is fine, just dont want the 300 rpm up/down with borderline stall Pls clue me in on best...

Reviewing some data logs for n/a SBF 427 with FAST Classic. From 5k rpm up the lines for kpa/vacuum are zig zagged thru 6k rpm shutdown. RPM likewise zigs that last 1000 rpms. It is very pronounced and eratic when overlayed in the VE table playback. This was on a DTS engine dyno. The...

Got off dyno recently with SBF 427W with good parts that put down 540tq@4700 and 532hp@5700. Wished it would have carried pk power higher and further but very strong until running out of steam. Big question is why are my WOT VE Table #'s 65-80 (at pk tq)? Is this anything to be concerned...

Trying to get this 427 SBF (N/A) to work on an engine dyno is turning into a major headache with FAST B2B Ford TFI... First question is how likely is it that a .gct file could be corrupt and act like a virus? Base file was modified from an emailed .gct file from Bennett racing. Initial...

Taking my 427W, 10.5:1 cr N/A motor to an engine dyno with B2B FAST. What Im figuring is that best power will be in the 32-36* timing, and 12.5-13.2 a/f range (slightly richer at pk tq). Assuming most will agree with these ranges, is there a relationship between both as I sneak up on the...

Data logged drive in to work and all cruise light throttle O2 Corr % were single digits, usually right at 1-2%. All was well. Later in the evening (&next morning) did more data logging and suddenly noticed that light throttle input had the O2 Corr dumping 20-24% under the same basic...

Both of my cars (mustangs with manual tranny) always spike max lean (closed throttle which is fine) and then way rich after the upshift and never recover to match the Target A/F. Problem is that after the richness and 02 corr. starts pulling fuel out, it is still showing -x.x % of fuel being...

During a datalog for WOT 3rd gear, I had fluctuations in RPM, Boost, and corresponding Timing over about 4/10 of a second. Since it effected a few of the logged parameters I see this a engine related rather than FAST. It created a malformed W and fluctuated between 4400 and 4800(middle of W)...

Just finished the install of new B2B FAST on a '89 Mustang 393ci N/A(using a White plug&play interface) and got the car running, even with a decent idle, but Actual AF reads only in the high 15.'s, except briefly when blip'n the throttle. Using the "L" function, it has put VE values as high...

This is a mustang question I know, but forgive me... The vortech system for mustangs uses a Bosch bypass/recirculate valve from the boost side of the supercharger back to the inlet tube during cruise/close throttle conditions. For Mass Airflow sensors, returning the the air back to the...

Looking into cost effective unleaded race gas solutions and Toluene is getting a thumbs up from a lot of late model applications. My main concern (and why I wont just go with 110 leaded) is O2 sensor degredation. While many others have said it wont effect them, can anybody with FAST...

Installed new 72# injectors, but goes to very lean and poor idle after car becomes full warm and the fan kicks on. I'm noticing that the volts begin steadily dropping from start albeit slowly (14.2 down to 13.9 over 15 minute cruise). But after fan kicks she creeps down to 13.5-13.6. Car...

After switching to 72s the car starts rather well, idles "ok" with only a little hunting, cruising is about the same as before, start-off and gear changes are plenty jerky but can keep her going. Problem is that most of the above is happening with 15.94 AFRs or at least on the high end of...

Ever since installing FAST, car runs quite a measure hotter, especially in traffic/idle and cruise. Are there methods to change timing, a/f ratio's etc, that can help cool the engine at these times. FWIW, (on 351W and S-Trim), timing at about 1100rpm idle is around 30 degrees on BaseSpark...

slight misfire & crazy tach, now think its a FAST problem New clues trying to trouble shoot a slight misfire and a stock tach that dances around above 1500 rpms. Even a new TFI module changed nothing. If I take the spout plug out, very smooth engine and tach. Is this a FAST problem, or...

After start-up and idleing, coolant comes up to temp, even air is up to temp. Running in open loop and no other enrichment etc parameters should be playing a factor. But with the same VE table AFR starts at 15.9, then seems to warm up, drops to 12's for significant time (10-15 mins) and then...

Few driveability q's (long) edited Looking for some driveability guidance. Currently working in Open loop below 2500rpms for tuning. EDIT] Things are smoother with reducing AE MAP from 2040 to 540, bringing AE TPS to 0 for first increment, and richening bottom light load cells...

Finished FAST install on a Mustang (sorry but this is great site) and am having some issues with the fan. From the battery I have an in-line 30amp fuse, to a 30 amp Bosch relay. Fan only has Red and Black wires coming from the motor. Motor has 2 silver "relays" 20 amp/40 amp within its...