LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Can anyone help me interpret a 1/4 mi scan and diagnose why my car lacks power?

Thread Tools
 
Search this Thread
 
Old Jul 6, 2003 | 09:19 PM
  #1  
BobC's Avatar
Thread Starter
Registered User
 
Joined: Dec 1998
Posts: 89
From: Chicagoland
Can anyone help me interpret a 1/4 mi scan and diagnose why my car lacks power?

This is from my 95 Formula W2W race car. The 1/4 mi run starts at about line 191. The car ran 97 mph at the end of the 1/4 mi according to the timeslip. I kept it to the floor a bit longer to just see if it would wake up. The time was 14.7, but .7 sec of that was sitting at the light, and a bunch was in the 2.5 sec 60 ft time. Obviously, I'm not a drag racer. The major point here, is that given the mods, the trap speed of 97 mph was way low. I was shifting just before 5800 rpm.

scan from freescan:

http://home.comcast.net/~bob.currey/bobclt1.csv

I don't understand why my left side O2 BLM is 149. I also don't understand why its in cell 18 most of the way down the strip. I replaced all the plugs, and put in known good (blueprinted by Kinsler) LT1 injectors. I was running a steady 58# fuel pressure and the injector constant is set for 29# via LT1 edit to accomodate. I'm running a pretty much stock program with EGR, AIR TC turned off, and set for my 3.73 gears. No other changes have been made to fuel or spark.

The car has Ram Air intake with a K & N, Taylor wires, new coil, ported heads, compression raised 1/2 pt, balanced bottom end, Hooker long tubes, no cats, and true 3.5 oval pipe duals with an H Pipe.

I should add that previous to yesterday, I was running some 30# injectors, and I think one of them was bad, as the car was litterally sputtering down the strip. I decided one was bad because the plug in Cyl #5 was tan, when all the others on drivers side were fouled with black carbon and BLM was running 160 on left side. Compression test on 5 & 7 gave good numbers on both. Spark tester gave blue spark when hooked to #5, and noid light flashed when hooked in. Therefore, I swapped out the injectors, and removed the ECM fuse to force it to relearn, and reprogrammed for the smaller injectors. After I got all that changed and made sure it ran, I drug it to Wisconsin to the strip.

In summary, it seems way short on power vs what it should be, I think. I notice other people with trap speeds of 104+ with
similar mods.

Any ideas or suggestions? I'm racing it at Road America next weekend, and to be honest its not any fun racing if it doesn't want to run well.

thanks

BobC

Last edited by BobC; Jul 6, 2003 at 09:22 PM.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mr28
General 1967-2002 F-Body Tech
4
Apr 20, 2016 05:44 PM
CARiD
Supporting Vendor Group Purchases and Sales
0
Dec 26, 2014 04:20 AM
Injuneer
LT1 Based Engine Tech
5
Dec 15, 2014 09:36 AM
Dyoung_Z28
General 1967-2002 F-Body Tech
8
Nov 25, 2014 05:26 PM
USAirman93
General 1967-2002 F-Body Tech
4
Nov 24, 2014 03:37 PM




All times are GMT -5. The time now is 12:46 AM.