New guy from Delware
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Joined: Oct 2009
Posts: 13
From: Middletown, DE
New guy from Delware
Hey guys, name is Justin and I am from Middletown, DE. I have a 93s10 with a lt1/t56 swapped into it. I am excited to be here and hope I can meet some new ppl and all. Heres a pic of my truck and the motor.
Now i have just recently had trouble with the truck, took it to the dyno today and it put out 250hp/300tq to the wheels but the air/fuel ratio is not where its supposed to be, it idled at 16.1 and at 4k+ it really leaned out, if i can get a pic up i will of the chart, but I am not sure if the fuel pump is not effecient enough for the lt1 (i have my stock 2.8v6 pump in the tank still) or if injector(s) are bad. If anyone has input please let me know.
And if there are any guys around the DE area that tunes LT1's please let me know, i need to tune this baby, it shoudl be way more than those numbers are putting out.
Now i have just recently had trouble with the truck, took it to the dyno today and it put out 250hp/300tq to the wheels but the air/fuel ratio is not where its supposed to be, it idled at 16.1 and at 4k+ it really leaned out, if i can get a pic up i will of the chart, but I am not sure if the fuel pump is not effecient enough for the lt1 (i have my stock 2.8v6 pump in the tank still) or if injector(s) are bad. If anyone has input please let me know.
And if there are any guys around the DE area that tunes LT1's please let me know, i need to tune this baby, it shoudl be way more than those numbers are putting out.
Last edited by llorracs93s10; Oct 30, 2009 at 04:35 PM.
Thread Starter
Registered User
Joined: Oct 2009
Posts: 13
From: Middletown, DE
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Joined: Nov 1998
Posts: 71,121
From: Hell was full so they sent me to NJ
Welcome to CamaroZ28.com!!
We can probably help with the tuning issues. Best thing you could do would be upgrade the dyno sheet scan to a larger size. What was the A/F ratio when it kicked into PE mode?
Looks like a good topic for LT1 Based Engine Tech forum. I'm going to copy your post there.
Good luck!!
We can probably help with the tuning issues. Best thing you could do would be upgrade the dyno sheet scan to a larger size. What was the A/F ratio when it kicked into PE mode?
Looks like a good topic for LT1 Based Engine Tech forum. I'm going to copy your post there.
Good luck!!
Thread Starter
Registered User
Joined: Oct 2009
Posts: 13
From: Middletown, DE
Welcome to CamaroZ28.com!!
We can probably help with the tuning issues. Best thing you could do would be upgrade the dyno sheet scan to a larger size. What was the A/F ratio when it kicked into PE mode?
Looks like a good topic for LT1 Based Engine Tech forum. I'm going to copy your post there.
Good luck!!
We can probably help with the tuning issues. Best thing you could do would be upgrade the dyno sheet scan to a larger size. What was the A/F ratio when it kicked into PE mode?
Looks like a good topic for LT1 Based Engine Tech forum. I'm going to copy your post there.
Good luck!!
Administrator
Joined: Nov 1998
Posts: 71,121
From: Hell was full so they sent me to NJ
When you put the throttle close to the floor, it enters "power enrichment" (PE) mode. Instead of using the 14.7:1 stoichiometric ratio that it uses for part load/part throttle driving (good gas mileage, low emissions), it sets a richer target A/F ratio, as required to make more power and torque. Some people just call this "wide open throttle" (WOT), but the PCM will actually switches to the richer target A/F ratio based on a table in the PCM of throttle position vs. RPM.
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