Values 1985 corvette 4 plus 3
Safety Car
Joined: Oct 2007
Posts: 4,426
Likes: 229
From: Pennsylvania
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
I had an 84 4 plus 3 and I got the OD to work and the ran pretty good. I ported the intake and picked up some extra HP. At 75 miles an hour it got 27 mpg. I think the 4 plus 3 is much mi lined unnecessarily. Thank you and have a great day
Safety Car
Joined: Oct 2007
Posts: 4,426
Likes: 229
From: Pennsylvania
You're correct. Lots of bad information and negative opinions from people here who've never owned one or driven one. Learn to listen to owners with real knowledge about them. One member here called "ihatebarkingdogs" has an educated and lengthy true knowledge on these transmissions. Give him a shout.
Last edited by FOURSPEEDVETTE; May 29, 2020 at 09:02 PM.
Melting Slicks
Joined: Aug 2003
Posts: 3,401
Likes: 397
From: Lakeville MI
Do you already have scan data? Post a log if you can.
With only 25 bytes at 160 baud, you're not going to see much, but it is better than nothing.
Keep an eye on the BLM to ensure that you have plenty of working range between the 108 and 160 limits under various driving conditions. 128 +/- 10 is considered to be good, but really anything in the working range is fine. If you're fine tuning, many like to see something slightly rich like 120-128, but this is largely academic.
With only 25 bytes at 160 baud, you're not going to see much, but it is better than nothing.
Keep an eye on the BLM to ensure that you have plenty of working range between the 108 and 160 limits under various driving conditions. 128 +/- 10 is considered to be good, but really anything in the working range is fine. If you're fine tuning, many like to see something slightly rich like 120-128, but this is largely academic.
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
Tequilaboy,
I did not get notification of your post. I would have replied sooner, sorry. I am using TunerPro RT from Mark Mauser. It's actually a really nice program. I am going to run it again this week. The car is at a shop. I will write down the values. yhe O2 is running about 140. But, I can smell the car is running rich. I think the FP regulator is set too high. I will look at the BLM. Thank you
I did not get notification of your post. I would have replied sooner, sorry. I am using TunerPro RT from Mark Mauser. It's actually a really nice program. I am going to run it again this week. The car is at a shop. I will write down the values. yhe O2 is running about 140. But, I can smell the car is running rich. I think the FP regulator is set too high. I will look at the BLM. Thank you
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Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
Fourspeedvette
I did not know until recently the 85 has forged crank and rods. Some of the 86 do but that is it. Everything else is cast. But, for me being I do not run high revs it's kind of academic.
I did not know until recently the 85 has forged crank and rods. Some of the 86 do but that is it. Everything else is cast. But, for me being I do not run high revs it's kind of academic.