S5 6 Port Turbo Question
If you had fuel control now, you could take out the t2 secondaries for 720's, and lean out the flow to make the optimal A/F ratio N/A. Then when you get the turbo, you can run more boost than if you had 4 x 550. If you're dead set on 4 x 550 right now, i would still suggest fuel control, otherwise you'll be running rich.
Thread Starter
Wish he had a running rx7
Joined: Nov 2006
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From: Oklahoma City
Ok your saying that if I had 4 550cc that I would be running to rich with the n/a. If I got 460cc and 720cc secondaries I would be running rich for the n/a. I would need a Fuel Control to adjust that. When I do my turbo conversion I can set the fuel control to high or whatever so that I wont be running lean.
SAFC doesn't adjust richness at idle on the FC, so if you're going with a SAFC, you'll leave the idle primaries alone (460cc), then you can tune the secondaries for the amount of fuel you need when you're in boost (over 3800 rpms). If you have a standalone you can tune changes wherever, so it doesn't matter so much.
Ok your saying that if I had 4 550cc that I would be running to rich with the n/a. If I got 460cc and 720cc secondaries I would be running rich for the n/a. I would need a Fuel Control to adjust that. When I do my turbo conversion I can set the fuel control to high or whatever so that I wont be running lean.
SAFC doesn't adjust richness at idle on the FC, so if you're going with a SAFC, you'll leave the idle primaries alone (460cc), then you can tune the secondaries for the amount of fuel you need when you're in boost (over 3800 rpms). If you have a standalone you can tune changes wherever, so it doesn't matter so much.
the fact of the matter is your running a megasquirt. if you run a megasquirt, you can choose any combination of fuel injectors that you want. im running 550/1600 on my setup.
hell you can just run only two 800's and you'll be able to get away with it.
remember, its always easier to subtract fuel than it is to add fuel.
hell you can just run only two 800's and you'll be able to get away with it.
remember, its always easier to subtract fuel than it is to add fuel.
Thread Starter
Wish he had a running rx7
Joined: Nov 2006
Posts: 1,180
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From: Oklahoma City
Ok so to break it down. The easiest way is to just get 720cc injectors and a SAFC. When I get the turbo set up the 460cc will be plenty for a idle and the 720cc will be enough for when the turbo spools up right.
yea, if it's too lean at idle on the 460cc , then richen up the idle mix.
I just realized something. Maybe I am being stupid but, if you buy a pair of 720cc, you can move your 550 to the primaries and get rid of the 460 cc. Then you can run 2 x 550, 2 x 720.....
I just realized something. Maybe I am being stupid but, if you buy a pair of 720cc, you can move your 550 to the primaries and get rid of the 460 cc. Then you can run 2 x 550, 2 x 720.....
Hell, stock 460's NA, you're running rich already! For your setup, an SAFC or some other sort of piggyback, or standalone (recommended) would be good for you.
My AFC Neo can lean out my idle quite a bit......I've always been under the impression that the AFC did adjust AF mixtures at idle.
My AFC Neo can lean out my idle quite a bit......I've always been under the impression that the AFC did adjust AF mixtures at idle.
Try leaning out the idle from 500-1000 rpm range on low throttle to -20%. If it starts to get rough, then you know you can control idle A/F's.
Keep in mind, he's on a budget.
Thread Starter
Wish he had a running rx7
Joined: Nov 2006
Posts: 1,180
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From: Oklahoma City
close to what i'm doing. You have to think about also what i'm using on my n/a street port.
megasquirt
460cc to probably 550cc primaries later but not now.
Trying to find 720cc secondaries.
Already have t2 packs
Walbro is not required for this conversion. Especially 2
I will have to have the t2 fuel rails and I wont have no pulsation dampener crap on it.
Might need the fuel regulator.
I will also do a fmic because the top mounts supposely can go higher than 250hp.
megasquirt
460cc to probably 550cc primaries later but not now.
Trying to find 720cc secondaries.
Already have t2 packs
Walbro is not required for this conversion. Especially 2
I will have to have the t2 fuel rails and I wont have no pulsation dampener crap on it.
Might need the fuel regulator.
I will also do a fmic because the top mounts supposely can go higher than 250hp.
I would throw an upgraded fuel pump on anyway. Saves you the hassle from having to do it later. And you know you'll want to do it later. Walbro or Nippondenso will work fine.
Definitely go FMIC ( I love VMIC's, but FMIC is a close second)
Definitely go FMIC ( I love VMIC's, but FMIC is a close second)
Thread Starter
Wish he had a running rx7
Joined: Nov 2006
Posts: 1,180
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From: Oklahoma City
You probably don't want to go nuts on the boost because you're going to be running NA rotors, so the chance for detonation will be higher if you lean out. The FD fuel pump is recommended for this, along with larger secondary injectors. I haven't heard of porting the exhaust manifold, but you better have a wicked *** die grinder bit and a lot of time on your hands, that thing's solid. A lot of people recommend porting the wastegate though if you're going to be running plus boost, so that you can dump it off quicker.