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Went to the dyno to tune the afc..need help

Old 04-12-07, 12:15 PM
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Went to the dyno to tune the afc..need help

So I went to the dyno last weekend, put down 300+whp, which is great. But.. I was going lean at 5500rpm due to an momentary boost spike. Now this is off the wastegate alone no boost controller. After trying to rich the mixture up at 5500 rpm we hit a "wall" with the s-afc. It would not richin it up any further. So after doing a pull on the dyno and watching the afm signal on the s-afc screen, we figured the afm was "bottomed" out. Meaning it was being sucked in by the turbo to it's limit at around 5500rpm's. I verified this by taking the air filter off and pusing the afm cone by hand and having someone watch the afc screen to see the volt range..so my question is has any one else had this problem and how do I fix it rather than going standalone.
Bigger secondary injectors?FPR? Btw the s-afc worked fine at other rpm increments and light-load tuning, and my car is running very smooth now

My mods are: td06 turbo kit
walbro pump(rewired)
4x720cc injectors
fmic
S5 stock eng.(lots of miles)
Attached Thumbnails Went to the dyno to tune the afc..need help-scan0002.jpg  
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Old 04-13-07, 11:41 PM
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**** anyone read this forum?
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Old 04-14-07, 10:30 PM
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pretty good numbers on a safc, how many psi??? also i really don't know how to help you about the afm but 300whp is insanely good, i would be happy to have thos numbers on my fc.
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Old 04-14-07, 10:33 PM
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im shooting for 270-280whp, my mods are: walbro 255fp rewired, aeromotive fpr, turbosmart bov, turbosmart boost controller, racing beat turbo back, safcII, T3/T4 turbo, spalm e-fan, koyo radiator, tid mod.
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Old 04-14-07, 10:34 PM
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forgot to add, 800cc secondarys
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Old 04-14-07, 11:57 PM
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[QUOTE=rx7legend]im shooting for 270-280whp, my mods are: walbro 255fp T3/T4 turboQUOTE]

I thought the T3/T4 turbo was to small(exhaust side) for an rotary? If I were you I would upgrade your primary injectors also, the 720's work well.

**** it, I 'm gonna try 1000cc secondary's and see if the s-afc can tune those down better than it can tune the 720's up.
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Old 04-15-07, 12:08 AM
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Originally Posted by rx7legend
pretty good numbers on a safc, how many psi???
Here ya go, You can see the spike at 5500rpm and the corresponding lean a.f.r.
Attached Thumbnails Went to the dyno to tune the afc..need help-scan0003.jpg  
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Old 04-15-07, 02:03 PM
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[QUOTE=SupSai7]
Originally Posted by rx7legend
im shooting for 270-280whp, my mods are: walbro 255fp T3/T4 turboQUOTE]

I thought the T3/T4 turbo was to small(exhaust side) for an rotary? If I were you I would upgrade your primary injectors also, the 720's work well.

**** it, I 'm gonna try 1000cc secondary's and see if the s-afc can tune those down better than it can tune the 720's up.
the exhaust side is .84a/r that's pretty big, with this turbo i can push upwards 300whp but i don't have a standalone to do that so im not going to go crazy on ths psi, maybe 11psi max. also with upgrading my secondarys only to 800cc im ok till 320hp or so, after that i have to go to 1300cc or bigger, deppends on what im going to do, but for now im sticking to the 270-280whp mark. also your boost spike is not to bad. it spikes from 12 to 14???? try porting your wastegate that would help your boost spike.
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Old 04-29-07, 11:43 PM
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hey man, just wanted to ask you, you did this on pump gas or race gas???? also i was looking at your dyno chart and your afr were quite lean for a tII, 12.6 is too lean try going for 11.1 or so that will help you and as i said port your wastegate it will help your spike problem.
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Old 05-01-07, 12:51 PM
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Originally Posted by rx7legend
hey man, just wanted to ask you, you did this on pump gas or race gas???? also i was looking at your dyno chart and your afr were quite lean for a tII, 12.6 is too lean try going for 11.1 or so that will help you and as i said port your wastegate it will help your spike problem.
It was done on pump gas, and yea I have an external wastegate so I'm sure it's big enough.
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Old 05-08-07, 12:25 AM
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Thumbs up update

Went back to the dyno! and belted out about 340rwhp 300+ ft/lbs!, as stated previously I went for the 1000cc secondary's(as the only change) and they worked like a charm. The S-AFC worked great at lowering these injectors down. I even got to turn on my ebc as the lean spot was gone and turned it up to 15psi. My goal was 350hp w/ this setup and I came real close, I think I'm going to put on an meth/h20 kit and try to get it up past 350rwhp on the stock ecu and s-afc.
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Old 05-15-07, 10:06 PM
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impressive man, i think you are one of few if not the only one that has go that far with a safc and be succesfull, are you retarding your timing in any way????? im really curious if you haven't touch your timing. all in all good work man.
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Old 05-15-07, 10:40 PM
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Originally Posted by rx7legend View Post
impressive man, i think you are one of few if not the only one that has go that far with a safc and be succesfull, are you retarding your timing in any way????? im really curious if you haven't touch your timing. all in all good work man.
Thanks man, I never touched the timing. With the right injector combo I think the s-afc is very useful and worth the money, as for the stock afm thats the problem. As it requires you to put these large injectors in.
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Old 05-19-07, 06:26 PM
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So Did U Do Ur Own Tuning????
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Old 05-23-07, 01:24 AM
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Originally Posted by SSDTURBO2 View Post
So Did U Do Ur Own Tuning????
No Steven Burkett at:http://tuxedoparkracing.com/index.html did the tuning. Well it was kind of an team effort, I watched some guages and worked the s-afc while steve told me how much fuel to add or subtract, and we both learned how to use the profec-b right on the dyno .
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Old 05-23-07, 02:06 AM
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Dyno Chart actually 339 hp and 306 ft/lb torque peak. I have an another one but it will not upload it shows before and after tuning. So basically I went from 292 hp untuned 10-12 psi to 339 hp tuned @ 15psi. and torque went way up at 5000 rpm's from 240 ft/lbs untuned to 300 ft/lbs tuned!
Attached Thumbnails Went to the dyno to tune the afc..need help-supsai7-01.jpg  
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Old 05-23-07, 05:59 PM
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i actually just had this same problem when i went to the dyno a few weeks ago. i have a medium streetport, stock s4 turbo , full exhuast 3inch, 3inch tid, 800cc secondaries and 550 primaries, and an afc2.

i ran into the same problem at 5600 rpm also it would just go lean and there was nothing that could be done about it, steve (kan) told me that it was the injectors that were maxed out, so theonly thing i can think of is that someone sold me injectors that were smaller than 800cc for my secondaires. so im going to go with the more expensive cure and go with the haltech e8, and upgrade to s5 turbo with ported wastegate. and also buy 4 brand new 800cc injectors from rc engineering. but i wasnt too disappointed with the numbers it made 248whp and 237 wtrq, so i know i have a strong motor just need the fuel for it
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Old 05-24-07, 07:55 AM
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great numbers,

but i'm just curious

i'm assuming ur ecu is chipped since u are running the 720's in the primaries on stock ecu and not hitting fuel cut ?

if it's a stock ecu, does your car have trouble starting? does it flood easy? the Ecu ignores the AFC during cranking/starting.. and has a tendency to flood


FYI.. if you go with an aftermarket ecu and remove your airflow meter and tweak the timing u'll probably gain another 30-40hp... at the same boost..
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Old 05-24-07, 02:02 PM
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Originally Posted by tuns0ffun65 View Post
i actually just had this same problem when i went to the dyno a few weeks ago. i have a medium streetport, stock s4 turbo , full exhuast 3inch, 3inch tid, 800cc secondaries and 550 primaries, and an afc2.

i ran into the same problem at 5600 rpm also it would just go lean and there was nothing that could be done about it, steve (kan) told me that it was the injectors that were maxed out, so theonly thing i can think of is that someone sold me injectors that were smaller than 800cc for my secondaires. so im going to go with the more expensive cure and go with the haltech e8, and upgrade to s5 turbo with ported wastegate. and also buy 4 brand new 800cc injectors from rc engineering. but i wasnt too disappointed with the numbers it made 248whp and 237 wtrq, so i know i have a strong motor just need the fuel for it
Stand-alone is definatly the way to go,but pricey, and since you not have an afm to worry about, you should have enough fuel. I believe I could have easily reached my horsepower w/ my original 720ccx4 inj. combo, w/ an stand-alone ecu. I wouldn't mess w/ the stock turbo unless it's an hybrid if your hp goal is anything above 300hp, an streetported motor needs something bigger.
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Old 05-24-07, 02:07 PM
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Originally Posted by Ottoman View Post
great numbers,

but i'm just curious

i'm assuming ur ecu is chipped since u are running the 720's in the primaries on stock ecu and not hitting fuel cut ?

if it's a stock ecu, does your car have trouble starting? does it flood easy? the Ecu ignores the AFC during cranking/starting.. and has a tendency to flood


FYI.. if you go with an aftermarket ecu and remove your airflow meter and tweak the timing u'll probably gain another 30-40hp... at the same boost..
No my ecu has not been chipped, but i do have an FCD. The car has no trouble starting and does not flood, your thinking of s4 cars.
I know about the advantages of an aftermarket ecu, but just showing what can be done w/ a simple s-afc w/ a good inj. combo
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Old 05-24-07, 04:11 PM
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i only have hp goals of 300 t0 315 or so, so the s5 turbo and bigger injectors along with the haltech should do me just great, good job with your car though
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Old 05-25-07, 12:22 AM
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Originally Posted by tuns0ffun65 View Post
i only have hp goals of 300 t0 315 or so, so the s5 turbo and bigger injectors along with the haltech should do me just great, good job with your car though
If your talking rwhp, and dead set on an stock S5 turbo make sure the turbo is fresh ly rebuilt to handle huffing that much air, and have an decent intercooler or aux. injection to handle the super heated air that turbo will be pushing out. good luck w/ your setup
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Old 05-26-07, 03:34 PM
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nice numbers.. I cant believe the timing is being ignored... Awsome.

To make the horsepower ur making Im paying a lot more=P
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