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Anyone ever use the Summit SUM-830452 for activating the VVL instead of the MSD version? It appears to be comparable to the MSD 8969 at less than half the price:
Digital readout, 10 RPM resolution, under $50? That seems like a no brainer to me. Wish it had a picture. For that price I'd get two and activate independently!
i dont care for summit ignition products. i got a mallory style coil and it was bad when i got it. they sent me a new one in like 3 days but it died 2 months later and stranded me at work. ill be buying name brand ignition parts from now on.
Yeah, you'd be hard-pressed to call this an ignition part anyway; hell, it's just an electronic relay... Regardless, I can find no reason NOT to use this, given its price and the fact that it's a short-term solution. I'll give it a shot and report back...
Scott, how's yours runnin'? We mine installed but are attending to the myriad of small details (90% done, 90% to go). We did manage to fire it up and verify it runs with no rod knock so I'm satisfied for the short term. It should be on the street in a week or so. BTW, struts worked out great, thanks. - GA
Anyone ever use the Summit SUM-830452 for activating the VVL instead of the MSD version? It appears to be comparable to the MSD 8969 at less than half the price:
Yeah, you'd be hard-pressed to call this an ignition part anyway; hell, it's just an electronic relay... Regardless, I can find no reason NOT to use this, given its price and the fact that it's a short-term solution. I'll give it a shot and report back...
Scott, how's yours runnin'? We mine installed but are attending to the myriad of small details (90% done, 90% to go). We did manage to fire it up and verify it runs with no rod knock so I'm satisfied for the short term. It should be on the street in a week or so. BTW, struts worked out great, thanks. - GA
My car's running great! Got some tweaking left, but for the most part it goes like stink.
For you guys not running the MSS when dose it shut the VVL off? Take my MMS settings. I have my intake cam kick at 6k and then the exhaust kicks at 6400. The VVL stays on unless the revs fall lower than 4800. Dose the MSD or what ever you run work like this?
The 8969 shuts off 300 rpm lower than the setpoint on the way back down. That or you can set the return off setpoint to whatever you'd like, but there is no high "off" point if you do (if that makes sense...).
Yep, depends on the system you use. As Scott described, that's configurable with the MSD-8969 (and, I'm assuming, the Summit part, which we'll find out...)
Keep in mind these devices (called "window switches" because they turn one during a specified "windows" of RPM range) were designed for things like nitrous activation, where the nitrous would kick in at, for example, 3500 RPM than turn off at, say, 6500 RPM. Those two RPM values are configurable by the user.
However, these devices cannot turn "off" at the same "on" RPM, because then you'd get what's called "flutter", where is you ran the car at a constant 3500 RPM (the "on" set point) the unit would not know if you want it on or off. So, they're designed to auto turn off at a pre-selected RPM below the on. This way, it comes on at 3500 on the way up, off at 3300 on the way down, and if you run the car at 3500 (or 3400 RPM) RPM it'll stay on.
For the MSD-8969 that pre-selected value is 300 RPM lower than the "on" point. I do not know what the value is for the Summit unit, but I suspect it's similar.
Now, note above that you can set an "off" value higher than the "on" value. Well, on either the MSD or the Summit you can actually make that "off" value lower than the "on" value, thereby over-riding that default 300 RPM difference. IOW, I can make the "on" value 4000 RPM, then set the "off" to 3500 RPM. The VVL will then activate at 4000 on the way up, stay activated as long as I stay above 3500 RPM, then de-activate when I drop below 3500. Thus, I've configured the unit for a 500 RPM difference rather than 300 RPM.
This last part sounds a lot like what yours is doing; I'm guessing you've set the "off" for 4800 on both. If you get for us the make and model of the unit you're using, I'm sure one of us can figure out if that large value (4800 RPM below 6+) is a pre-configured value, or if it's something you can set yourself. - GA
On edit: You noted "MSS"; is that the Greddy unit? Here's a link to a thread here on the forum that describes how to program it. sounds like you need to adjust your "off value:
Also, you're activating your cams way too high; you should be looking to bring in those guys a lot sooner; you're leaving a lot of ponies on the table between the high-4000 range and 6000+ RPM. - GA
Yep, depends on the system you use. As Scott described, that's configurable with the MSD-8969 (and, I'm assuming, the Summit part, which we'll find out...)
Keep in mind these devices (called "window switches" because they turn one during a specified "windows" of RPM range) were designed for things like nitrous activation, where the nitrous would kick in at, for example, 3500 RPM than turn off at, say, 6500 RPM. Those two RPM values are configurable by the user.
However, these devices cannot turn "off" at the same "on" RPM, because then you'd get what's called "flutter", where is you ran the car at a constant 3500 RPM (the "on" set point) the unit would not know if you want it on or off. So, they're designed to auto turn off at a pre-selected RPM below the on. This way, it comes on at 3500 on the way up, off at 3300 on the way down, and if you run the car at 3500 (or 3400 RPM) RPM it'll stay on.
For the MSD-8969 that pre-selected value is 300 RPM lower than the "on" point. I do not know what the value is for the Summit unit, but I suspect it's similar.
Now, note above that you can set an "off" value higher than the "on" value. Well, on either the MSD or the Summit you can actually make that "off" value lower than the "on" value, thereby over-riding that default 300 RPM difference. IOW, I can make the "on" value 4000 RPM, then set the "off" to 3500 RPM. The VVL will then activate at 4000 on the way up, stay activated as long as I stay above 3500 RPM, then de-activate when I drop below 3500. Thus, I've configured the unit for a 500 RPM difference rather than 300 RPM.
This last part sounds a lot like what yours is doing; I'm guessing you've set the "off" for 4800 on both. If you get for us the make and model of the unit you're using, I'm sure one of us can figure out if that large value (4800 RPM below 6+) is a pre-configured value, or if it's something you can set yourself. - GA
On edit: You noted "MSS"; is that the Greddy unit? Here's a link to a thread here on the forum that describes how to program it. sounds like you need to adjust your "off value:
Also, you're activating your cams way too high; you should be looking to bring in those guys a lot sooner; you're leaving a lot of ponies on the table between the high-4000 range and 6000+ RPM. - GA
I put down the wrong numbers. Those are the numbers I set on Ivans car with the Franklin Stage 4's when he took it to the track. I know how to set the MSS I was just wondering if the MSD guys had the flexibility like the MSS is all.
can the apexi SAFC do these things also ??? like make both cams hit at once ??? or does it only let you change when u want the individual cams to kick in earlier ?
can the apexi SAFC do these things also ??? like make both cams hit at once ??? or does it only let you change when u want the individual cams to kick in earlier ?
Yes but you need to install a new VVL return spring.
Got the switch in. This thing is pretty neat. It weights nothing, and from the photos you can see it's very small. Look closely at the board and you can see that it's got a single LED display, and just to the upper left of the display you can see the one button you use to configure it.
One thing of note is that is does *not* allow you to configure the "off" to be below the "on"; thus, you can save a couple of bucks and get number 830450, which is the same thing but without the upper "off" window (I'll set the upper "off" to something stupid like 12,000 RPM)
I've got an email into Summit to find out how far below the "on" it turns "off" and how many amps it's capable of switching. Will advise... - GA
so I'm satisfied for the short term. It should be on the street in a week or so. BTW, struts worked out great, thanks. - GA
