S5 6-port BP EFI hesitation question
#1
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S5 6-port BP EFI hesitation question
So, I have an S5 Bridge-port that was originally carb'd when I got it. I took the liberty of swapping the carb setup with S5 TII port-matched intake manifolds, 465cc primaries and 720cc secondaries. I'm still trying to get the timing adjusted for more efficiency, but no matter where I position the timing, I get a sputtering/hesitation from 7k to 8k rpms. When it was carb'd, it went up to 9k rpms. Don't get me wrong, there's a huge acceleration/throttle response difference, but it's really annoying to have lost about 2k rpm "redline." I am running a stock N/A S5 computer and that might be the problem, but I figured there might be something else I can try to gain a higher rpm reading. Anyone with ideas, let me know.
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#2
87 SE WITH S5 T2 SWAP
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if i was you i will go back to the carb setup,with a nice holley,demon,webber carb it will run way better that with the stock sistem,s5 computer,flow meter,map sensor and ecu are holding you back,you can try advancing the timing to the point that the cas wont move anymore,higher fuel pressure and adjust the flow meter a little,i seen a couple of BP on stock ECUS and this changes help a little,your best choice will be getting a standalone of some sort in order to run the engine the right way.
#4
87 SE WITH S5 T2 SWAP
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here you go
you are gonna need some kind of aftermarket fuel pressure regulator and the flow meter has a a adjusting screw that is covered with a small black cap,remove the cap and play with the screw and see if that helps,the only bad thing about playing with the meter is that it will affect the complete fuel timing map so you need to find the sweet spot.
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Do you know which way to turn the screw to allow more air? B/c I think the sputtering has to be from running rich with the 720cc secondaries at high rpm.
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Well I'm hoping to just be able to make adjustments to accomadate the injectors as is. I did notice a hp increase when putting on 720cc after trying out my buddies 550cc's. I just need to find out what to do in order to compensate for the increase in fuel. That's why I'm considering adjusting the airflow meter. I want my BP at full potential as an N/A before I turbocharge it.
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ok......well I'm asking about ideas on helping my situation, not how what I have is a bad idea. I bought the car as a carb'd BP. So the BP was already done and I'm not a fan of carbs so I swapped to a TII S5 manifold that I ported and polished. So for stock manifolds, its the best I can get. Now, do I need to get an MSD ignition....or megasquirt....or standalone...or what...?
#12
i believe bad83 did good with a s4 ecu
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