So lifes long gotten away from me, hopefully next week I can begin the long awaited L98 swap in my 87' IROC.

Heres the details and what I'm working with:

Car: 1987 Z28/IROC LB9 TPI 305/auto
Engine is a 1989 Corvette L98 (automatic car)

I have some DynoDon headers with provisions for the corvette style EGR stove pipe, so thats taken care of. Entire AIR system is being removed.

Once I get the old engine out the oil pan and oil pickup will be swapped over as well as engine mounts.

I have the ESC from the L98 Corvette, I'd think that will work here? I also have a L98 knock sensor.

Am planning on swapping over things like coolant temp, fan switch, and oil pressure from my old engine, hopefully the aluminum heads have the same provisions.

I have to figure out how to mount the external coil for my car since the L98 in the corvette had the old style HEI dizzy and i'll be using the 1987 F body one.

I have to figure out the memcal situation, I have a re-writable eerpom and a chip burner, but no 1987 L98 F-Body calibration to write to it. I have the memcal from the corvette but I doubt that will work here.

Right now I have Ford/Bosch yellow top injectors on the LB9, are those good enough for a L98? not sure. Either way I have the original injectors from the L98 hopefully those are good yet.

So what do I have right, wrong or am I missing before I start this? Thank you in advance

 

I didn’t see mention of oil pan and oil pump/pickup replacement.

since they are 19#hr might as well upgrade your injectors now.
the coil bracket can be u Shape ground to fit the Vette intake base.

 

I did mention that, but yes those components will need to be swapped over.

Thanks for the information on the coil bracket

 

if your tight on funds this would test and clean your 22#hr injectors , Southbayfuelinjectors’s has 22s on their site for a reasonable price.

 

The ks is 100k just limit torque to 14ft lbs if you have the Vette esc use it if not the lb9 should be okay.

 

I am just listening in and request an explanation of the above statement. Also, the Amazon link provided me an Amazon page with no FI Cleaner kit, or the like.

Thank you, Mike C

 

what are you wanting to know about the comment ?

 

That seems like an interesting tool and with a ultrasonic it would be pretty useful at least for quick and dirty cleaning.

I think to start I'm going to use my yellow tops, at 43PSI they ought to be flowing closer to 22lb , honestly probably a bit big for the 305 that they've been on. But I know these work well. I need as few problems as I can have for the initial stage of getting it running.

I looked into using the Vette Memcal, it looks like they had an oil temp sensor that can possibly throw a SES light, not the end of the world to get started but If I can find a factory 87; L98/Auto calibration I'm going to go with that. Engine is dead stock.

When pulling a engine out the top, how much a concern is not smashing the heater box in one of these? It looks like. space is a bit tight there. Its been many years since I pulled a RWD engine.

 

I would not use the Corvette Memcal. Since the L98 is stock, you should be able to get it up and running with the 305 injectors and Memcal.

I didn't have an issue pulling the motor with the heater/AC box in place. It will come out with the exhaust manifolds still on it. You said you were using headers. Going back in, headers will need to go in after the motor. Leave the motor mounts loose, may need to raise the motor a little to slip the headers in, then put the motor mount bolts in.

For the remote coil, here are some photos of how I made it work. Flatten the existing mounting bracket in a vise and then mount to the back of the passenger side cylinder with some steel spacers to clear the valve cover.

 

I think you mentioned having ability to tune ? Just use arap if 128 heads and vats delete with fan sw changed and your set.,you don’t have to worry about the engine oil temp that went to the ip on the Vette.

 

In theory I have that ability, however the last time I messed with writing PCMs has been many years. I have a old Moates chip burner, a re-writable eeprom in a Moates adapter.

But I'll be honest past that I have forgotten anything I did know about it. I'll have to fire up my old tuning laptop and see what I have installed on it, Probably a old copy of TunerPro Rt and TunerCat

the Corvette memcal I have is APYZ, is there a repository of factory calibrations I can refrence?

 

apyp was superseded to arap, if you need arap gear head efi has it in the $6E section

 

I think, at this point I looked it up. my rear axle ratio is 3.23 and a L98 car would have a 3.27, which should be probably close enough. My goal is at the moment to find a factory 1987 L98 calibration to write. I can go with something else after the fact. At this point I don't know what I don't know so since I'm stupid I'm gonna keep it simple. Did register an account at GearHead EFI so once thats approved hopefully I'll have access to a bin repository.

 

Are you focusing on passing emissions? The difference in rear gear ratio will not affect the running .

 

https://www.gearhead-efi.com/Fuel-In...Information-6E

 

Or if your wanting to stay $32B

https://www.gearhead-efi.com/Fuel-In...nformation-32B

 

Doesn't the 87 camaro and C4 use the same distributor? Or when did the camaro go to divorced coil? I know firebird was earlier.

 

Yes both large cap, spark latency is slight different between divorced coil hei but not worth worrying about

 

No, no need for me to worry about that. In fact I'm deleting the AIR system but keeping EGR

At the risk of being a dummy what is $6E and $3B this is a world I really don't know much about. I'm really a noob to these older computers so feel free to take me to school if you need.

Once the guys at Gearhead EFI approve my account I should be able to see those links.

Starting in 87' was the small cap dizzy on F cars but the Y cars kept the large cap awhile longer.

Thanks for the help, much apprechiated

 

The 1227165 is capable of using what’s called masks. Different binary code. The 89 $6e is the latest for tpi maf. 86 $32 and 87-88 $32B. All 16k file sizes but slightly different how the maf tables are and 89 doesn’t necessarily need the cold start injector.