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| 4.9 e85 dyno (Page 1/4) |
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lou_dias
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JUN 06, 10:37 AM
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Base dyno after switching to E85...the problem was I solved my limp mode issue so now I'm lean... I had switched to E85 to compensate for limp mode. Turned out to be a bad TPS sensor and wiring...now I'm super lean..
Once this is fixed 200rwhp and 300ft*lbs should be possible. I am also running 17x9 wheels now which are 2 lbs heavier than the 18x8.5's I was running before. An old dyno when I was pig rich had me at 175/265 so with not tune I picked up 12hp just switching to E85...
I stand corrected. My old torque was at 265 so I edit the post from 275.... That means I gained 20 ft*lbs from going to E85 with no tune.[This message has been edited by lou_dias (edited 06-08-2020).]
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Dennis LaGrua
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JUN 06, 01:21 PM
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| quote | Originally posted by lou_dias:
Base dyno after switching to E85...the problem was I solved my limp mode issue so now I'm lean... I had switched to E85 to compensate for limp mode. Turned out to be a bad TPS sensor and wiring...now I'm super lean..
Once this is fixed 200rwhp and 300ft*lbs should be possible. I am also running 17x9 wheels now which are 2 lbs heavier than the 18x8.5's I was running before. An old dyno when I was pig rich had me at 175/275 so with not tune I picked up 12hp just switching to E85...
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For more fuel you will need to go into the VE vs MAP vs RPM table in the chip and increase the values but once you adjust for E85 you won't run well on std E10 gas. .
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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lou_dias
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JUN 06, 01:36 PM
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It's ok, I no longer drive Fieros for fuel efficiency! 
...just pure fun!
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Spadesluck
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JUN 06, 02:27 PM
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How did you find out you were in limp mode?
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lou_dias
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JUN 06, 05:53 PM
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| quote | Originally posted by Spadesluck:
How did you find out you were in limp mode? |
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Well, it would run like crap on startup. This was a Fiero Factory conversion so it had a constant SES light. I went thru the harness and fixed some issues over time and upgraded to an Allante intake and Bosch Design 3 injectors so I ended up turning down the BPW ~25-30% and now I need it back but not so much up top...
Still has a loose throttle actuator but runs good other than way too lean. I should run a tank of 89 octane...
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dear1700
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JUN 06, 08:39 PM
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Or just go with aftermarket ecu and tune it yourself. You would be surprised how much power is limited with those ancient ecus and limited means of adjustments.
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Spadesluck
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JUN 06, 08:51 PM
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| quote | Originally posted by lou_dias:
Well, it would run like crap on startup. This was a Fiero Factory conversion so it had a constant SES light. I went thru the harness and fixed some issues over time and upgraded to an Allante intake and Bosch Design 3 injectors so I ended up turning down the BPW ~25-30% and now I need it back but not so much up top...
Still has a loose throttle actuator but runs good other than way too lean. I should run a tank of 89 octane... |
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I may have some questions for you about this particular issue later on. I am building my 4.9 with an F40 trans at the moment. The car was originally a Fiero Factory conversion as well.[This message has been edited by Spadesluck (edited 06-09-2020).]
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Spadesluck
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JUN 06, 08:53 PM
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| quote | Originally posted by dear1700:
Or just go with aftermarket ecu and tune it yourself. You would be surprised how much power is limited with those ancient ecus and limited means of adjustments. |
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You say that but the 4.9 is an older motor so there is no just easy plug and play aftermarket ecu.
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Warlordsix
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JUN 06, 09:22 PM
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| quote | Originally posted by Spadesluck:
You say that but the 4.9 is an older motor so there is no just easy plug and play aftermarket ecu. |
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The F.A.S.T. EZ Multiport EFI Retro kit should work. I haven't tried it, but I'm considering it.------------------
'87 Fiero 4.9 5-speed
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Dennis LaGrua
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JUN 06, 09:37 PM
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There is nothing wrong with the 4.9L ECM. It can be adjusted for fueling and timing across the entire RPM band for all MAP values. It has complete timing and fueling tables that can be adjusted/rewritten. You can even modify the 4T60e trans shift point and firmness. All you need is the Tunercat program, the program code and a prom programmer all of which can be purchased. You read the stock prom program load it into the editor and make any changes that you wish. Then you load the new program on a new chipTo solve the "limp home "issue run 12V to the power steering ECM pin input. Here is my setup for easily removing and inserting the eprom chip using the Moates adapter and a EZ prom (or flash memory) socket
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 06-06-2020).]
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