Would i need to buy an fcd if i got an Corksport reprogrammed ecu? IT says it raises your fuel cut, but would it be a good idea to get one aswell?

I will be running a Corksport cat back, somekind of downpipe, midpipe, and a 3" TID, ported stock wastegate, stock turbo, MBC, and necessary fuel upgrades (i.e 720 primes, 950 seconds, and a walboro). I want to push around 10-12 psi with minimul to no creep at all. Is this possible, or is this a school boys dream?

 

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The Cork Sport ELP comes with fuel cut capabilities.

Were it my car, I would keep the boost to 10psi or less, and use the smallest injectors possible. I think your planned injectors are too large. Contact Cork Sport to see what injectors you can run with their ELP. Keep in mind that tuning by email isn't exactly optimal, and you would be better off with something more tunable like an S-AFC and a good local tuner, but I understand that your budget or resources may not allow for this.

 

what would be the difference in using the smallest injectors possible vs safe larger ones. oh yeah, i also have an SAFC.

 

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Smaller injectors allow for more accurate fuel injection. There's alos no point in replacing injectors when the stock ones are adequate. With a stock turbo there is no need to run injectors bigger than stock. The Walbro and (dyno-tuned) S-AFC are all you need.

You will also not need a boost controller, since you're more likely going to have trouble keeping boost down, not up. Porting the wastegate will be imperitive. Have a bigger flap fitted too, as the stock flap is not big enough to cover a wastegate port of the required size.

If the reprogrammed ECU raises the fuel cut to above your planned boost, then there's no need to an an FCD. The higher fuel cut will give you protection from out-of-control boost.

 

I don't agree entirely with that statement. Yes, you can run 10-11 pounds with a walbro and be fine...I did the same thing and my a/f numbers were in the mid 11's all the way to redline.

Try and run .9-1bar of boost on the stock injectors and I think you're going to lean out. Running 13 pounds and more is kicking the **** out of your turbo, but there is a tiny bit more power to be made as we all saw from the recent 268 rwhp dyno of the stock port/ic s4 @1bar.

 

He said stock turbo. The stock turbo shouldn't be taken past 12psi, because the stock intercooler can't cope with the heat and the bearings can't cope with the shaft speed. I'd never suggest anyone boost the stock turbo higher than that, so the stock injectors are fine with the stock turbo, if you keep the boost at a sensible level.

If you have a problem with boost creeping above that, sorting out your boost control is smarter in the long run than using very rich mixtures to keep detonation at bay.

 

Do you have a link to that? Couldn't find it through a search.

 

https://www.rx7club.com/showthread.p...highlight=dyno