Has any member installed this kit on a 1992 Corvette??

I know other members have installed these systems on other years, but I'm looking for feedback specific to the 1992 model year installation process - which requires several additional modifications...

Anyone please??

 

I haven't installed the Delteq yet (I probably will in the next year) but the differences are minor.
1) You need to eject the pins from the ECM-to-Opti-Spark connector housing under the right side injector cover and install them in the same pin location in the supplied connector housing -- this change makes this connector the same as '93 and later. No splicing of wires is needed -- just a pin ejector tool that you can buy at Pep-Boys.
2) There are different bolts needed for the valve covers to mount the coils.

Other than that, it is like doing a '93 to '95. On '92 to '95, you will probably have to bypass the tach filter because the tach signal is derived from the Delteq module instead of the original ignition coil. On the '96, the tach signal is a dedicated signal that comes directly from the ECM (none is needed from the Delteq module) and therefore a tach filter doesn't exist.

Tom Piper

 

After studying the wiring diagram on the Delteq website, I wonder why they are redirecting the low-res and high-res signals from the Opti-Spark through the Delteq "box." It seems they could have just spliced into them and used the signals and let these signals pass on through to the ECM. This tells me the low-res and high-res signals are being processed by the Delteq box before being allowed to pass to the ECM.
The low-res signal is needed by the ECM to determine injector fire timing and a coarse EST (spark timing) signal. The high-res signal is needed by the ECM to refine the EST (spark timing). The Delteq supposedly just uses the ECM EST signal to determine ignition timing.
What concerns me is: if the Delteq box isn't processing the low-res and high-res signals before passing them on to the ECM, these wires could just simply be connected to and not redirected through the Delteq box. And, if the Delteq box "is" processing these signals before passing them on to the ECM, I want to know how that processing modifies these signals the ECM sees. The ECM depends on these signals for injector and spark timing -- if they are altered, I want to know how this affects the injector and spark timing.

It is possible that Delteq determined the low-res and high-res signals directly from the Opti-Spark optical sensor didn't have enough current capacity to drive both the ECM and the Delteq box simultaneously, so they are amplifying the signal to a level that can drive both loads. If that is the case, then the timing of these signals isn't necessarily altered.

Tom Piper


[Modified by Tom Piper, 9:10 AM 6/24/2004]

 

 

Tom you want a 92 to be a guini pig for your Delteq experiment. I will supply the car and beer? You supply the delteq and knowledge!

 

Tom - I understand everything you're saying, however, I need to know specifically if the '92 is different in other areas. I am not able to mount the coilpack mounting bracket in the specified location because the air pipe and check-valve are located too close to the valve cover. There is not enough clearance to permit the bracket to mount - I would have to utiliize spacers great than 1" to get the bracket over the check-valve and this would not allow the coil pack to clear the hood. The air pipe/check-valve combination is solid and cannot be "bent" out of the way without damaging the assy and I don't want to get into modifying the vette more than we are doing by trying to install the HI system... there appears to be no other location in the '92 that will accomodate the bracket/coil-pack assy.

Really bum'd about this...




[Modified by linkschamp, 10:25 AM 6/24/2004]

 

You could always get some 93-96 Valve covers. They look cooler and are supposedly quieter. I also found that the greatest thing ever is the removal of the EGR/AIR system cause those pipes seem to get in the way of everything! Of course most people have emissions testing and this is not a viable option.

Would just the newer valve covers help ya? Maybe you could make some brakets to hold the packs?

 

I live in Mass where emissions testing will not allow removal of the EGR/AIR setup. I don't believe changing covers will make any difference (clear the EGR/AIR assy). I really don't have the tools to fabricate a decent bracket and the one from Delteq is first-rate. If I had headers and lived in another state, I'd be assembling the coilpack on the car now instead of typing this reply...

 

Now.....that is interesting.

Have you notified Delteq about this?

Can you notch the plate to clear the EGR pipes and valves and still install the coil pak? I guess the BIG question is will the coils clear the EGR?

Tom Piper


[Modified by Tom Piper, 10:34 AM 6/24/2004]

 

[QUOTE] ...

Now.....that is interesting.

Have you notified Delteq about this?

Can you notch the plate to clear the EGR pipes and valves and still install the coil pak? I guess the BIG question is will the coils clear the EGR?

Tom Piper

Tom - I have a call into the vendor now - waiting for call-back. I thought of notching the plate but the coil-pack base runs very close to the edge and I don't believe I can shave enough off to clear the check-valve. I have not tried to mount the coils on the base or the coils/base onto the bracket or have I tried to modify any part of the kit (in case I return the system).

Its really frustrating - especially for my son - it appears the car will be down for another (3rd) week.

 

You know since that is the side with the rubber hosed AIR sysetm you could possibly loosen the bottom nut on the AIR and turn the top part IE the check valve over and out some. Then tighten it back. Might work since the hoses are rubber on that side and not just metal. I hope I'm not being to much of Capt. Obvious.

 

As far as I know, of the '92 through '96, only the LT4 doesn't have EGR.
So, I would expect all except '96 to have the same problem -- I don't think the '93 and up valve covers would make any difference.

Tom Piper

 

Just heard back from Delteq - gonna go out and try to release and pivot the air pipe/check valve assy away from the valve cover... keep ya posted.

 

Our state sucks like that. Just gotta go to the right inspection stations I guess.

 

Hi everyone

Here are the things specific to the 1992 Corvette install...

1. The 1992 Vette has a different connector on the passenger side of the intake manifold than 1993-1997 Vettes. Currenrly, we are including replacement connectors for these to adapt them to our harness. there is no soldering required to change them - you just pop out the pins from the old connectors and install them in the new connectors. Then our harness plugs right in.

We will be offering 1992-specific interface harnesses in the near future that do not require the connectors on the intake manifold to be switched to the later connectors. These will be available very soon! In the mean time, we include the later connectors in our 1992 kit.

2. The 1992 Vette has the finned aluminum (or mangesium?) valve covers. This is the only year for them. All later Vettes have the black plastic covers. TO install out coilpack mounting bracet, we include different bolts and 1/2" billet aluminum spacers to raise the bracket above the fins. This is a simple installation.

3. The AIR tube in the driver's side manifold needs to be loosened and "re-clocked" to clear the bracket. This is simple...as long as you use Kano AeroKroil bolt remover. This is the BEST BOLT REMOVER EVER. It makes liquid wrench and WD-40 look like Loctite! Unfortunately it can only be ordered on their website at http://www.kanolabs.com I am not affiliated with this company...I am just giving this endorsement because I hate breaking off exhaust manifold bolts!

I believe the AIR tube adjustment is ONLY for 1992 cars. The 1993-up cars I have seen don't have this problem. In fact, our original beta Vette was a 1993, and I didn't have this issue.

4. For 1992-1994 Vettes (and 1993 F-Bodies), the Tachometer filter needs to be removed. There are three wires going in to it - 2 white and 1 black. Simply connect the two white wires together and remove the filter. The filter is no longer available from GM, so I am not able to get my hands on one. IF anyone has a tach filter on their car, I am trying to find out if it has connectors on the white wires that we could use to make a simple bypass harness.

And to answer Tom's question, we do not modify the Opti signals inside our unit in any way. The harnesses were designed this way in case we needed to do anything to the signals in the Opti Box in the future...


Best regards,
Pete Visser
Delteq
703-476-3566

 

I've found a six-sided "crow-foot" wrench that is used on the end of an extension with a breaker bar to do wonders for this fitting in the exhaust manifold.


Thanks for the answer.


I dont't have my car or shop manuals here at work, but if I remember correctly there is no convenient way to "tap" into the white wires on both sides of the tach filter. As I'm sure you know, the white wire on one side of the tach filter connects directly to one of the siamesed connectors on the old coil. I don't think the other white wire has a convenient place to connect under the hood.

Tom Piper

 

Hey Pete, here's a thought:

Since the high-voltage section of the Opti-Spark is no longer used with your setup, how about a plate that bolts to the front of the LT1/LT4 front cover that has a much smaller diameter Opti-replacment mounted to this plate. Then, if the optical sensor or bearing ever goes bad, just the smaller Opti-replacment unit would have to be removed from the plate for replacement. Hopefully, you could do this without removing the water pump or front damper -- a ten minute job.

Tom Piper

 

Thank You Pete for the great explaintion.


James Maldonado http://elitesparplugs.com

 

Hope you guys get this all figured out and available before I need to do this upgrade. I love plug and play mods. Where is this tach filter?