Holley 1100 Sniper for iron duke (Page 4/4) cartercarbaficionado APR 25, 11:27 AM quote Originally posted by snyderman: Hey Is anyone considering this? https://www.holley.com/prod...barrel/parts/550-552 It would bypass all the old engine electronics. P.S. I'm not changing the engine. So don't bother trying to take me in that direction Thx. I did briefly consider it actually but decided to try my 88s old ecu in my 84 (no it's not a real 88 ecu sadly its a crappy 84 ecu i had to repair with a iron and a whole tray of replacement transitors) I do know what might be causing your ecu code 51 though. clean everything with contact cleaner and verify the ecu board is grounded to case and the case is grounded to the chassis and so on and so forth. can't lose much but time anywho honestly the sniper setup if your just fed up with the stock wiring would be a fresh start and hopefully a new lease on the fieros life snyderman APR 25, 01:00 PM quote Originally posted by 82-T/A [At Work]: So, just wanted to address this... as I'm currently going through an Iron Duke rebuild with my daughter (we actually just finished it last weekend). Is your desire to keep a stock look, or you don't want to go through the hassle of changing out the motor? I ask because if you want to keep a Duke in there, there were several enhancements over the years. Mid-1985 and up got a roller cam, which is quieter, and typically takes less wear. 1986 I THINK got a new intake and TBI unit. 1987 got an entirely new belt-drive system (serpentine), along with DIS ignition. 1988 got a new balance shaft which improves "smoothness of the engine," along with a different crank, pistons, and rods. Each year saw a culmination of the previous year's improvements that went from 92bhp as a rackety "Iron Duke" tractor motor in 1984, to a much smoother running 98-100hp "Tech-4" in 1988. So if you're OK with swapping out Duke motors, there's a lot of improvements you can get. I'm rebuilding my daughter's 1985 motor (which has a roller cam), and there are several improvements we're making, including replacing a LOT of the accessories (see this video here): ... bottom line (what you should take away from the video), every single one of the belt accessories has a more modern replacement that will literally "bolt in place." Another thing you can also consider doing is replacing all of the pulleys with a 6-groove serpentine pulley, and you can literally have a serpentine belt system, using the alternator as the "tensioner" as you would similar to with a V-belt. All of that said, my personal opinion, you could swap out the ECM with a new MicroSquirt system and eliminate a lot of the inherent drivability issues ... or so I've heard. I'll be doing this with my daughter on her car this summer. EDIT: re-reading the thread, I understand all of what you want to accomplish. I agree somewhat with PMBrunell, though I'd recommend a MicroSquirt, specifically, this kit: https://www.diyautotune.com...foot-wiring-harness/ ... I really like this kit, and I've purchased one myself. I got a lot of **** for recommending the FAST EZ-EFI 2.0 (which I intend to use for my V6), but I think you'll really like the MicroSquirt. It's exceptionally well laid out, well documented (literally... the back has the entire pinout), and lots of support. I get a lot of flack for this, but the factory ECMs are old. They were fantastic for the time, but they are slow (300 baud) and don't adapt well (or quickly) to changing environment. Hunting idle, 2000-rpm cold idle, etc... all these things could be fixed / eliminated with a newer ECM that makes a better (quicker response) to sensor changes. Of course, it's important to remember that most problems you have before an ECM change, will likely exist after an ECM change. Regardless, I think you'd see improvement by going with a modern ECM. Note: swapping out the TBI unit won't fix your problem, it'll probably introduce more issues. BUT honestly, your Holley TBI unit is a definite improvement over the factory one, so I think that new TBI unit you posted is probably not worth it. But... all of these things will work better with a good ECM that can take advantage of it. EDIT #2: (sorry) ... another thing I wanted to mention is, one of the really nice things about the Fiero, and when it was designed / made... is that the gauge cluster is totally independent of the engine management system. Like, there's almost nothing in the gauge cluster that makes use of the ECM. There's the shift light of course, but other than that, the gauges all get their readings directly from the sensors on the engine (some sensors are dedicated specifically to the gauges). So... point being, swapping out the ECM, while not "easy," does not require a complete rewiring of everything... just the wires that the ECM directly uses. Thank you, but I'm not interested in swapping out my iron duke. Everything is running great. Good luck with your project however. snyderman APR 25, 01:02 PM quote Originally posted by cartercarbaficionado: I did briefly consider it actually but decided to try my 88s old ecu in my 84 (no it's not a real 88 ecu sadly its a crappy 84 ecu i had to repair with a iron and a whole tray of replacement transitors) I do know what might be causing your ecu code 51 though. clean everything with contact cleaner and verify the ecu board is grounded to case and the case is grounded to the chassis and so on and so forth. can't lose much but time anywho honestly the sniper setup if your just fed up with the stock wiring would be a fresh start and hopefully a new lease on the fieros life Thanks for your support. Indeed it was worth the time money and effort and made my Fiero reliable. No longer worry about hard starting, stalling and high revs. snyderman APR 25, 02:01 PM quote Originally posted by 82-T/A [At Work]: I cringe whenever I see pictures of this Holley TBI unit... the reason is, I had one, and completely gave it away. I had a 1984 Fiero 2m4 SE that I bought back in 1997 for $1k... it was really nice. But as a kid, it had to sit in the South Florida sun as I didn't own a house at the time, and the sun basically destroyed the paint and seals. Eventually, I gave the entire car away for a bottle of rum in like 2003 or something. Along with it, I gave away a Holley TBI unit that I'd bought new. It had less than 1,500 miles on it. I thought to myself... "I'm never going to own another 4 cyl Fiero, probably not an early Iron Duke at least..." Now, my daughter has a 1985 Fiero 2m4 SE in which this would have dropped right in. I just checked eBay really quick again before posting this. They are so rare now, that I wouldn't even believe they existed unless I had actually had one previously. Well today is your luck day. You reminded me I have a 3739 that was on my Duke before I went to the sniper. As I mentioned previously, it was not as much that I didn't like the performance or the stock or holley TBI that made me move to the sniper, but the old technology for '84 that the sniper replaced. It is so easy to monitor engine performance that it's no longer a guessing game to why the duke wasn't running right. In any case, if you interested in buying my 3739, please send me a PM with an offer. 82-T/A [At Work] APR 25, 03:04 PM quote Originally posted by snyderman: Well today is your luck day. You reminded me I have a 3739 that was on my Duke before I went to the sniper. As I mentioned previously, it was not as much that I didn't like the performance or the stock or holley TBI that made me move to the sniper, but the old technology for '84 that the sniper replaced. It is so easy to monitor engine performance that it's no longer a guessing game to why the duke wasn't running right. In any case, if you interested in buying my 3739, please send me a PM with an offer. PM Sent, thanks!