I just bought a 87 tpi harness and ecm+prom for $15 at the boneyard.Right now I have the lathargic 85 ecm and prom.What will I have to do to convert my 85 harness to an 87 ecm?I can change the harness but a conversion would be a little less work.The 85 and 87 harness apears to be the same, cold start injector,ac,iac etc.The 87 harness did'nt seem to have a oil pressure fuel pump cut off and the dist clip is different.

 

http://www.eecis.udel.edu/~davis/z28/ecm_swap/

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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Raptor 700R4 Tranmission, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Hooker Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project

 

For all the work to do that, you might consider just going ahead and switching to the 90-92 MAP system. In the above URL, they have a 165 to 730 adapter (or used to), and then you could really be *state of the art*. There is lots of info archived on this.

 

Formual5, if I recall, you have a 406 with a TPI and stock L98 cam. While that setup is not a "high revver", you do run the risk of maxxing the MAF at fairly low rpms.

Right now, I am helping a friend with a 383. While his setup is a bit more radical than yours, we are already finding that his engine is well into the 200+ gm/sec flows @ only 4,000 rpm. His engine isn't broken in yet, so he cannot rev it out, but it looks like his MAF is going to max out somewhere at 5,000 rpm and he isn't even into his power band. So we will be converting to SD because after 4,800 rpm, you cannot adjust for extra fuel with MAF if the MAF is maxxed past 255.

With your engine even being larger you are most likely going to max your MAF even lower. With the stock TPI on your 406, you MIGHT be able to compensate if the MAF doesn't max out much lower than 4,800 rpm. But you definitely won't be able to take it much beyond. And if you ever upgrade your TPI (or heads and/or cam) which enable you to rev beyond 5,000 rpm then you definitely will have a mixture problem.

I agree with Bruce and I would seriously reconsider a swap to SD. It isn't that much more difficult than swapping to a 165 and it will allow you to tune your mixture to 6,400 rpm. SD's VE tables tune to 5,600 rpm and the PE (WOT tables) allow you to tune up to 6,400 rpm.

Don't let people scare you about tuning the VE tables, it's a little time consuming but the method is very easy and the results are great. Once you get the hang of tuning the VE tables, it does go much quicker and it is a very direct and easy method.

I am finding that MAF at a specific flow (but at different rpms) can be lean at some rpms and rich at others; thus you end up compromising with it never really being right at the specific rpm you want. With SD you alter a specific RPM/Load factor and it affects nothing else, so you end up getting them ALL tuned right.

 

I do like the speed density setup.Unfortunatly there's not enough sd f-bodies in the salvage yard.I have a very limited budget.Right now the mas is'nt really close to 255.It's actually a 400 sbc not a b&s 350.After I change the heads,l98 cam and intake components the mas will max out.The only thing is that my car is for street and does'nt really need to go over 5000-5500 rpms.Considering its a 400 thats probaly were she is going to rev anyways.It's going to be a while until all the mods get done.The reason I got the 87 ecm and harness is there is no 350 prom for 85.The 87 ecm is quicker and a 350 prom would be closer to a 400 calibration.That would be more easy out of the box to make changes to the prom.Speed density is in the future though.On a side note what would 19lb injectors be at 50 psi?

 

And from what I understand tunercat can't be used w/ 85 bin?

 

Glenn,

Could you give some specifics on your friends 383 combo. I've just received my PP2 burner and am waiting on my AT29c256 chips to start burning my own proms. I'm just curious as to how radical his application is compared to mine and whether I might need to switch to SD in the near future (going to a bigger cam early next year). I am going to modify the ARAP code to begin with to see what I can get out of my current setup.

Sparks a flyin'

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1989 L98 IROCZ, Bored .030 over,400 Crank,Dart PRO 1 Heads 200cc intake,ZZ3/ZZ4 Cam,Crane 1.6 RR,Edelbrock 3860 Hiflo TPI Manifold, AS&M LTRs, Edelbrock 58MM TB, Ported Plenum, TCI Reverse Pat Man Valve Body, SVO 24# injectors,TCI Streetfight Stall Converter, 3.23 Gears on Auburn Pro Posi, Some Suspension Mods

 

Yes, it can.