View Full Version : 87 turbo gn injectors

04-01-2007, 06:08 PM
hello I have a 87 gn I am thinking my injectors may be a little small for my set up it is a stock gn block .030 over stock heads with some light port work stock valves with 100 lbs springs. It has a te44 turbo with a 3 inch down pipe 3000 stall red stripe converter and running 20 to 22 pounds of boost
I have blue top injectors now I have never run the car yet so do I need bigger injectors or not!

04-01-2007, 08:44 PM
whats your air fuel ratio?? :innocent:

04-01-2007, 08:58 PM
I may sound a bit dumb this car is new to me how do I check it I have a scanmaster 2.1

04-01-2007, 09:13 PM
Tuned properly at ~22 PSI you should be OK. If you go up in boost, you may need more injector. I did.

What is your O2 at WOT in 3rd?

04-01-2007, 09:22 PM
the best I can tell on the street it is around 750 mv I will know for shure thur I am going to run it at the track I was looking at a set of msd 50# is that to much? I am shooting for mid 11s do you think it is possible with the blue tops? :six:

04-01-2007, 09:31 PM
dont waste your money on msd 50#'s get the motrons 65#'s.. i run those on everything .. from the mild hotair to my built ttype...

and i perfer to tune with a wide band so you know exactly what a/f ratio you are running ..

the stock o2 sensor " aka narrow band" will get you close, but i perfer to be dead what im tunning my cars for

LM1 is inexpensive vrs changing headgaskets

04-01-2007, 09:45 PM
what is Lm1?

04-01-2007, 10:00 PM
LM-1: Digital Air/Fuel Ratio Meter

Tuning an engine for maximum power previously required long trial-and-error sessions on a dynamometer. With the LM-1, precise AFR measurement allows the user to correctly adjust many variables- including carburetor jetting, fuel injection, turbo fuel curves, etc.- without long and expensive dyno sessions. The meterís digital signal processing technology provides data on exactly how rich or lean an engine is running at any load. The LM-1ís self-calibrating circuitry also compensates for changes in temperature, altitude, and sensor condition.

The instrument can sample and store the air-fuel-ratio and the other sensor data internally in operation for later analysis on a personal computer. At a sampling rate of 12 samples/second the instrument can store up to 44 minutes worth of data in non-volatile memory. The data can be downloaded to a personal computer using a standard serial port and viewed/analyzed by the included software or any standard spreadsheet program.

The standard LM-1 includes a Bosch wide-band oxygen sensor and cable, cigarette-lighter adapter, serial cable for PC connection, 9V battery, exhaust bung and plug, CD and manual. The LM-1 ships with a Bosch sensor, however, it can also function with other wide-band sensors, including Honda/NTK and VW sensors.

Available accessories include auxiliary input cables, alligator-clip power cable, exhaust clamp, analog output cable, and Aux. input expander. Additional accessories include a dash-mountable display and AC adapter.

The LM-1 sells for $349.99, including the oxygen sensor (Bosch LSU4.2), 10' sensor cable, 10' power cable, serial PC cable, and software.. http://www.fullthrottlespeed.com/mmFTSS/Images/lm1.jpg