Like Buttah! [Sharktuning success story]
#16
Three Wheelin'
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Well, the WOT map is useful when you are reaching the limits of the injectors. Of course the correct solution is to get larger injectors, but for now I need a short-term solution. I guess I could always fool the LH into thinking it has smaller injectors on the fuel parameters menu...
Dan
'91 928GT S/C
475hp/460lb.ft
Dan
'91 928GT S/C
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#17
Race Car
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Check your injector duty cycle. You can set the RPM where the LH goes from injecting once per revolution to once every other revolution with the ST. That will give you some extra time to keep the injectors open. If you are getting high injector duty cycle using the main map, the WOT map won't really help since the injectors can only be open for so long. I don't like the WOT map because it has no load input. If you are at 475rwhp, then you are beyond the load measuring capability of the standard MAF so you are basically just throwing fuel at it without regard to the air it is using.
Dan
'91 928GT S/C
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#19
Three Wheelin'
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Yep, this is what I have learned from my time with the ST2. At WOT the EZK load is at 100% all the time and the injector duty cycle hits 100% at around 5k RPM. 30lb injectors and my standard MAF are not up to the task. Now, if I could just find my spare MAF so I can have John SuperMAF it...
Dan
'91 928GT S/C
475hp/460lb.ft
Dan
'91 928GT S/C
![EEK!](https://rennlist.com/forums/images/smilies/eek.gif)
#20
Three Wheelin'
Thread Starter
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Hi Louie,
Is the 424 the size Andy used?
Do the GT cams help or hinder forced induction? I think maybe there's more overlap which might not be advantageous?
What I'm trying to get at, of course, is whether 500 rwhp is replicable on my setup, which at first glance it would appear to be.
Is the 424 the size Andy used?
Do the GT cams help or hinder forced induction? I think maybe there's more overlap which might not be advantageous?
What I'm trying to get at, of course, is whether 500 rwhp is replicable on my setup, which at first glance it would appear to be.
#21
Three Wheelin'
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Hi Louie,
Is the 424 the size Andy used?
Do the GT cams help or hinder forced induction? I think maybe there's more overlap which might not be advantageous?
What I'm trying to get at, of course, is whether 500 rwhp is replicable on my setup, which at first glance it would appear to be.
Is the 424 the size Andy used?
Do the GT cams help or hinder forced induction? I think maybe there's more overlap which might not be advantageous?
What I'm trying to get at, of course, is whether 500 rwhp is replicable on my setup, which at first glance it would appear to be.
It appears that the GTs with SC do a little better than S4s with similar setups. However, almost none of the TS SC installations are the same and other things would enter in to cause differences. I remember I did a comparison between the conical K&N air intake Andy supplied mounted close in front of the MAF, and the flat stock 928 filter I put in front of the radiator. Andy's air intake lost 15hp compared to the 928 (paper) filter in the flat box in front of the radiator. I also port matched the SC mount/intake to the cylinder ports and chamfered the openings for better air flow. Hopefully, that helped.
#22
Race Car
#23
Three Wheelin'
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John will supply a MAF to SuperMAF converter box for $225. The hangup on the MAF converter boxes is the difficulty in getting the MAF plugs and of course the time to make the things.
#24
Rennlist Member
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Louie usually has a SMAF in stock. I can send him one by the end of this week. It will take about 1 week to him. As he says, I much prefer to modify a stock MAF rather than supply the seperate box. But I will supply them, it just takes a few days longer.
#26
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He's something that might be of use to the twin-screw guys in particular and maybe some of the CS guys too.
I am using DR's "Power Boost Module." It's basically a pressure switch that is activated as soon as you hit boost. You splice it into your LH's WOT line. So, whenever you go into boost, it tricks the LH into going into the WOT enrichment mode. For me, it eliminated any and all tip in and drops you into the right fuel range as soon as you hit boost.
Now as for tuning. I found that all I needed to tune was the cruise map and pretty much leave the WOT enrichment values as they were (they're easy enough to tweak as they're only RPM based).
Just a thought if you're still struggling with transitions into boost (and WOT).
I am using DR's "Power Boost Module." It's basically a pressure switch that is activated as soon as you hit boost. You splice it into your LH's WOT line. So, whenever you go into boost, it tricks the LH into going into the WOT enrichment mode. For me, it eliminated any and all tip in and drops you into the right fuel range as soon as you hit boost.
Now as for tuning. I found that all I needed to tune was the cruise map and pretty much leave the WOT enrichment values as they were (they're easy enough to tweak as they're only RPM based).
Just a thought if you're still struggling with transitions into boost (and WOT).