So I've had my FD for probably 15 years and have never done much with it. I'm trying to fix up all the old hardened hoses under the bonnet and have 2 questions. First is, is there any way to clean up the engine bay to make things simpler to work on? Can any of that spaghetti be removed? I know it was packed under there but now I've removed some stuff I've realised it's even worse than I ever thought. Second question is, is there somewhere I can buy a hose kit to replace all those hundreds of little hoses that are everywhere? I remember rx7store.net had a kit for $70 or something that had everything that was required but I can't see it there any more. I have changed the radiator hoses already so just need all the small stuff.

Thanks

 

Most people will say just convert it to single turbo, as it will simplify everything and remove a whole lot.

 

Not exactly certain on an AUS spec car. On a North American Spec, if you're on the stock ECU and have emissions, there's not a lot you can do to simplify. And unless you're having boost issues, leaks or other problems...I would leave it alone.
Going single turbo will all but eliminate those hoses and is VERY simple. But will require the turbos, special manifolds, fuel, programmable ECU and other supporting mods, which sort of off-set the simplification.
Keeping the stock twins, if you're able/willing to install a programmable ECU and remove emissions, you can remove about half of the vacuum lines and solenoids. And it's a logical step to replace the hardened rubber vacuum lines with quality silicone versons.
From FAQ sticky in the 3rd Gen. Tech:

https://www.rx7club.com/3rd-generati...l-links-68640/

https://www.rx7club.com/3rd-generati...our-fd-904277/

https://www.rx7club.com/3rd-generati...-turbo-749702/

 

+1

 

People really get carried away with the rat's nest and how complicated it looks. Really, it doesn't make the car hard to work on per se. If you are having problems with the sequential system you will be in there doing some troubleshooting, but most maintenance tasks on the car don't involve the rat's nest in any way.

For all the complexity under the intake manifold, there's the benefit of many common things being VERY easy to replace or work on. I've done my share of alternators on front wheel drive cars and fought for hours to get it out - on an FD, it takes maybe 5 minutes. Many Hondas require removing the entire upper intake manifold to get to the starter. On an FD, 5 minutes. My old SC300 required removing a whole bunch of the top end of the engine to get to the spark plugs. FD, 5-10 minutes. These are the things that you really are doing over time.

I've said it many times, the vacuum lines that are baked on down deep in the rat's nest, leave them be. They are cooked on and not going anywhere. Any lines that are loose or are commonly removed (like going to the upper intake manifold) replace with silicone.

You can remove and simplify stuff by removing emissions, but without an aftermarket ECU, the stock ECU won't be happy and the car won't run right. Big one is the airpump - remove an airpump with a stock ECU and the car will idle rough and be rough on/off throttle. Easily fixed with a PowerFC.

Dale

 

^Just as a side-note...a quick 'thank you' to DaleClark for taking the time to do that thread I linked to. As indicated in my sig, I simplified several years ago, removing all emission. But if his diagram was there then, I'd forgotten about it until looking up stuff for the OP. It's being printed as I write this and will be laminated for the wall of my shop for reference in the event of issues (yeah...I'm old school )
Sometimes it surprises me the stuff I re-learn when trying to answer someone else's question.

 

Go to Autobarn and get silicone vac hose 5m bag and a knife and zip-ties. Are you still on stock ecu?

 

Thanks everyone. Answering everyone's questions
ECU is still stock and most stuff is stock. Just have after market exhaust and extend port.
I am having some boost issues, sometimes there is a delay with the second turbo kicking in and sometimes it doesn't seem to boost fully in first gear.

BTW, my question wasn't just related to the rats nest (I think that has been answered, leave it alone unless you get an aftermarket ECU), are there any other changes that will simplify things, eg intake, radiator, intercooler etc?

 

Not much that I can think of. If you want to keep it as simple as possible, resist things like turbo-timers (which do little good anyway), aftermarket alarms and stereos which add potential electrical gremlins. Depending on the series of your FD, an Efini 'Y' pipe eliminates the stock rubber coupler to the cross-over.

 

Delete ABS and fabricate new lines that are hidden away from view. Go single turbo, delete air pump, air con and power steering....pull loom and remove all wires that are no longer in use bonnet catches and remove bonnet latch and cable. Simplify cooling system by deleting AST and also throttle body coolant hose...etc etc. Extreme but hey how far you willing to go for a clean simple bay