North American Turbocoupe Organization



Another IVR Question...
vegas_ss Offline
Senior Member
#1
Has anyone tried one of these solid state IVR's from NPD?  They are set at 5v although I've seen some discussion that the voltage should be slightly higher (~ 5.4v?)  I guess that if it is a little low that the gauges will also read a little low?  It's a little pricey versus buying the components and building one but once you figure in the time and material and shipping costs (too bad radio shack closed) it may be worth the few extra $$$


NPD Solid State IVR
1987 TC, 5sp, Boport Stage 3 Head/2.1 Cam
1996 Impala SS
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Kuch Offline
Senior Member
#2
Pretty sure that voltage is supposed to be 6v for the gauges, but like you say, if you expect it to be a little low at 5v, then not an issue. I'm sure they work just as well as any of the other DIY ones listed on this site, just plug and play.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof,  T3/T4 50 trim, ported E6, 255LPH, Kirban, 3" DP dual 2.5" w Hooker Maxflows, MGW shifter, K&N, Gillis valve, RR cam, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low
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Jeff K Offline
Administrator
#3
When I built my own solid state IVR with adjustable voltage output years ago, I found that the gauges seemed to read correctly (what I would call correctly meaning that oil pressure of 40 psi gauge read near the middle, fuel gauge was pretty darn accurate, and temp gauge settled around half way when fully warmed up) with the voltage feeding the gauges was 5.5 V.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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vegas_ss Offline
Senior Member
#4
I went ahead and ordered it... with shipping was ~$50 but it looks well built and thought I would give it a try and I'll post back the results.
1987 TC, 5sp, Boport Stage 3 Head/2.1 Cam
1996 Impala SS
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vegas_ss Offline
Senior Member
#5
Ok, results are in, the NPD IVR doesn't work properly or I got a defective unit.  Temp will not reach the normal range, oil pressure is at the bottom of normal and the fuel level which was ~ full, reads between 3/4 and full.

Seems the fuel gauge is not really too far off while the oil and temp seem to be about 25 - 33% off.  Guess it's time to build an adjustable IVR and try and get the gauges dialed in a little better.  5v is just too low (assuming that the IVR is actually putting out 5v.

In looking over the writeup by Jeff K and another I found online at Gary's Garagemahal, It seems that Gary's is more straight forward and I am able to understand it, however I'm not sure why Jeff's includes the extra parts (caps and resistors)?  The schematic on Jeff's really confuses me since the 12v power connects to the V in, .01uF cap whose output connects to the adjust leg of the LMT338t and a 300 ohm resistor and a 120 ohm resistor. I'm obviously electrically challenged and reading the text helps but I'm still unsure how I would assemble it! 


Jeff K's IVR

Gary's Garagemahal

Schematic from Jeff K's post...
   
1987 TC, 5sp, Boport Stage 3 Head/2.1 Cam
1996 Impala SS
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Jeff K Offline
Administrator
#6
The capacitor is basically there to, in laymans terms, keep the voltage regulator stable (i.e., to keep it from undergoing any oscillations). and the resistors are a voltage divider to set the output voltage of the LM338T regulator.

The regulator from Garys article does exactly the same thing that mine does, it just does the regulation a little differently.

I built my IVR with the LM338T regulator because I had experience using them when I worked as an electrical engineer in R&D in the power generation and distrubution industry back in the 1980s.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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