Specifics:
I have a full *long block* (all manifolds, injectors, OMP etc) S5 motor that I'm dropping into an S4 chassis.
This is for an ITS race car so don't worry about accessories (PS,. A/C, emissions, etc.) To go with the engine I also have a 91 ECU and fuel side wiring harness and the AFM.

My question is what problems am I going to run into on the ignition side?

It looks to me like the distributor runs to the drivers (ignition)
side harness. This worries me. Any compatibility problems with the dash?
I plan on keeping the S4 alternator (I'm too cheap to buy an S5 one)

Help me.
TIA
Crispy.

 

Thanks for the heads up from my post, I will keep an I on this one as well. 10 days with no response. I have to have mine done by Memorial day weekend for a regional triple so I'll have to learn it the hard way. I'll let you know how it goes.

Jamie

 

Yeah....bunch of slackers

Crispy

 

If you're going to do it legally you'll need the whole shooting match. There's no mixing and matching of components. Aside from that it's also much easier in a practical sense to purchase both harnesses and do the swap correctly. The CAS loom is the deal breaker as you've found as well as the harness plugs being different between series at the ECU and AFM. All the S5 components are preferred so it's a no brainer to do a complete swap.

 

Also. Head over to improvedtouring.com and ask these questions. It's a much more focused group and an easy way to weed out the people that don't really realize what you're trying to accomplish.

 

I'm over on the It website daily, just alot more activity here.

 

Can you clarify this no "mixing and matching" thing.

I agree but try finding someone willing to dig out all these harnesses for me. It's been a royal PITA getting any one to follow through with a sale. I've got 3 emails out for offers to buy and none seem to respond to my emails....very frustrating.
Crispy

 

You can't create a model. All parts must be swapped in assemblies. Meaning, to the letter of the rule, you can't use an S4 intake with an S5 AFM. You can't run 4 piston brakes on the front and the solid rear rotors for example. You most definetly can't rig the S4 wiring to use everything else from an S5. There are probably guys that have done and get away with it. But that doesn't make it legal.

They're a bit more expensive than finding an individual seller but Mazmart will have what you want. www.mazmart.com And you need to be able to beat around the local junkyards to find the stuff you need as well. Your car will get bent from time to time and you'll need to know quick and inexpensive places to find parts.

 

So how do folks get away with S5 internals in an S4 motor?
Or using S5 intake manifolds on an S4 shortblock?

Mazmart will have it yes but they are just plain STUPID expensive.

I am trying to do the S5 complete wiring harness, really I am
Crispy
- looking for some clarity

 

Lots of people do things they shouldn't and damn near everyone of them gets away with it. Tech in SCCA at the regional level consists of rolling across the scales and nothing more. I just don't want you to set yourself up for a protest with a brand new car. There is a hugely slim chance it would come to that but I just wanted to make you aware of the fact.

 

LOL Thanks for the concern but I doubt I will be a threat to anyone and fully expect to be bringing up the rear of the pack....at least for my first few races

So by your interpretation of the regs are S5 internals in an S4 block illegal?
Kinda follows my S5 motor in a '88 chassis would be a no-go also. Damn!

Regards,
Crispy