Ok I've read alot of stuff about performance chips and such not for CC Q-jet cars, and my understanding is either go with the ZZ4 kit or go home.... So based on the fact that I do not like of the shelf performance chips and the fact that I will be building my 400+ hp 350 this summer, I decided to go ZZ4. so Here is what I bought and where I bought it, all those who have an 83-86 l69 or 85-87 lg4 can buy exactly what I have listed here, any one else needs to make a small adjustment but I am sure you sill find the parts on these two sites.

GMpartsdirect
EPROM - pn 24502456 - 66.63 + S&H

Rock auto

ECM reman Hiding under the part number 77-8079 or you can find it by going to the 88 chev montecarlo SS - 77.79 w/core charge

AC Delco Knock sensor 213-324 look under the 1987 IROC Z28 for this and the ESC module. The knock sensor is 34.98 the Module I already owned so I do not know the price but I believe it to have been aout 80$. so there you have it the electronics you will need for a 350. If you have any Questions about this or want to know my motor combo please feel free to ask.

Part of my motor combo is a CC carb from a 454 BB, this I had built for me at the tune of 280$ with lifetime warrenty from national carberators, it showed up at my door looking perfect was properly tuned (except 2ndary rods and hanger) and the best part is if I ever have a problem they can assist over the phone or I send the carb back and they fix it, not a bad deal in my book. heres the sight http://www.nationalcarburetors.com/
happy motoring.

 

Searching their on-line alternate catalog for the suggested application, it appears the module is 16126761 and the sensor is 10456287. However, it does not distinguish between between 305 and 350, which "everybody" says are different, except '88-'92 350's are not "covered" (so maybe those indeed are different). The module is $61.19 and sensor $35.08, both including S&H.

Looks like I may be able to use my current parts. That's good news (I was going to try, anyway...).

More application clicking shows the '87 V6 sensor listing is also used on the '88-'89 5.7l - isn't that interesting? And, the module listing doesn't change V6 or V8 for '87...

 

The module is part# 16128261 and knock sensor is 10456288. The original service # on label for ECM is 1228079, reman. replacement from GM is 88999154. These are the parts listed in the GM Perf. Parts catalog for the ZZ4 conversion. I did this years ago when I switched to a 350 (not a ZZ4) and ECM worked fine.

 

That's the same as the '87 V6 part I referenced. Comes up as the 5.7l if you search for '88 Camaro parts.

 

I believe the module and sensor are paired together.

The 16126761 module goes with a 10456287 sensor (this is for a 305).

The 16128261 module goes with a 10456288 sensor (this is for a 350).

In 90-92 I think the knock module is part of the memcal (ecm chip).

As far as I can tell the V6 didn't have a knock sensor at all.

 

What were the 454 CC q-jet applications? Couldn't have been used very long. California, mostly?

 

For whatever its worth, I just bought a complete ZZ4 ECM setup for $75 from a board member. That includes the ECM, PROM, knock sensor, and ESC (some ZZ4 ECM did not use an ESC).

With my combo below, I saw very decent performance even with the stock LG4 ECM/PROM. I felt there was room for improvement however, and mostly due to the weak timing. JET's Stage 2 chip did nothing. This setup however, makes a VERY noticable difference. Throttle response is better, the engine revs cleaner, and power is definately up. Only downside is that I now have to use 93 octane.

 

I figured there would be very little performance increase at WOT, however I did anticipate better throttle response, right now to get nice performance I have to run 14 degrees of base timing. Right now I have a stock 9C1 from a caprice interceptor. I has a ton of power from Idle to 4K, but after that it runs outta breath.

SO I have a fix for this, I am gonna run HOK 2055 Headers, Hooker exhaust, Edelbrock Air gap manifold, Trickflow 64cc CNC-ed heads, and the new Lunati Voodoo cams 276 duration with .5+ lift. Should be a solid performer I expect high 300 HP to Low 400 by 6500. DD2K claims 450 HP but thats a little much. I just hope the ZZ4 kit will live hapily with this setup.

 

5.7kid, National carberators offered that type of carberator to me over the phone, I wasn't particularly sure it even existed, even when it showed up at my door I figured it was nothing more than the standard carb, but after measuring the primaries of my old carb andthis one, there is a definite difference.

Now if I had to guess I would say som of the large work vans, the Suburbans, and a handle full of the large pick up trucks may have ne of these hiding under their aircleaner, even though most of those should have been TBI by now.

 

I found this via search I'm getting the ZZ4 ECU for my 85 LG4. What I'm gathering is that this is a direct plug and play thing. No re-wiring or re-pinning required for the new ECU? Also, I've read conflicting stories about whether the ZZ4 ECU and chip likes the EGR system or not. Any insights would be helpful.

 

The ECU is a direct plug-in. It is designed to use the EGR, but my setup ran fine without it (and fast passed the IM240).

 

I have it in my car, i have no EGR, a 12-404-14 (think thats right) comp cams blower cam and a camden roots blower, it runs great, is fast reliable and best thign of all is it still gets 20-22 highway in 5th with 3.73 and a gforce tranny (.59 OD). I get about 16 city if I drive normal.

 

Awesome! Thanks for the fast response

 

Without any direct knowledge, from what I've understood from this Board, the later versions of the HO 350 Camaro Conversion Kit eliminated the EGR entirely. The ZZ4 comes with a block-off plate, the earlier kits had a tube to go from the exhaust manifold to the hot air choke boss on the intake manifold but the later ones did not. The PROM was programmed with advance tables to account for no EGR.

But, again, that's without any direct knowledge. I kept the EGR with my ZZ3 clone because I wasn't sure how the system would act without it. With 6 degrees base timing and regular 85 octane gas (high altitude version of regular), I haven't had any pinging problems yet.