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Thread: VVL Switch Point Question - Dyno Graph

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Posts: 1-10 of 15
2009-07-03 14:24:15
#1
VVL Switch Point Question - Dyno Graph
I know there are other isues with this graph as discussed in another thread but

1. Looking at it, does it seem the vvl switch point is too high as pointed out by my friend?

2. Would lowering the vvl point get rid of the kink and give more USABLE hp?

Thanks.



Peace
2009-07-03 16:14:31
#2
As you can see from my first runs (red), it really jumped at my switch point. I lowered my switch point from 5600 to 5100 (green) and picked up a bunch of area under the curve. I later lowered it further to 5000, and now there isn't as much of a "kick" when accelerating. It's more of a nice steady pull that just keeps on growing as the revs climb.

2009-07-03 16:37:52
#3
Thanks Happynole.

The issue is that mine was at 5100 on the graph and not so sure how much lower I could go. I put them at 4600 the other day (not on a dyno) and the car felt very good but I have them now at 5000 for fuel economy purpose.

Guess I would need to dyno to find out the lowest I could go. I think lowering vvl swicth points too much affect the power band and peak hp? But can someone please explain?

Peace
2009-07-03 16:44:47
#4
no it wont affect peak power, just more power down low
most people with std cams swap around 4200-4800rpm
your aiming to get the power curve as smooth as possible
2009-07-03 17:01:07
#5
Originally Posted by lonewolf
no it wont affect peak power, just more power down low
most people with std cams swap around 4200-4800rpm
your aiming to get the power curve as smooth as possible


So Lonewolf,

For sr16ve cams in the sr20ve where do you suggest I set them if I should drag race b4 I get to sort it out on the dyno?

Rest of my set up in my signature. And I dont have cam gears.

I am guessing the car may be at 170+hp and 140tq.


Thanks

Peace
2009-07-03 18:00:25
#6
Originally Posted by happynole
As you can see from my first runs (red), it really jumped at my switch point. I lowered my switch point from 5600 to 5100 (green) and picked up a bunch of area under the curve. I later lowered it further to 5000, and now there isn't as much of a "kick" when accelerating. It's more of a nice steady pull that just keeps on growing as the revs climb.



so am I seeing that right the ssac made more HP and Torque than the ASP
Makes me think I should have spent that $ on N1 cams,instead of the ASP.
2009-07-03 19:23:55
#7
Originally Posted by happynole
As you can see from my first runs (red), it really jumped at my switch point. I lowered my switch point from 5600 to 5100 (green) and picked up a bunch of area under the curve. I later lowered it further to 5000, and now there isn't as much of a "kick" when accelerating. It's more of a nice steady pull that just keeps on growing as the revs climb.



Thanks for sharing Happynole, pretty similar results like Lonewolf's.
2009-07-03 19:54:49
#8
Happynole: Can you post full mod list? Thanks
2009-07-04 04:48:56
#9
At the time of those dyno results:
- stock VE bottom end
- N1 cams with BC springs & retainers
- CS cam gears at +5, -5
- OEM intake with e60 maf and JWT popcharger
- 2.5" custom mandrel catback
- JWT flywheel, pp, and disc
- JWT ecu with SAFC-2 used for afr adjustment

The first run was with an SSAC with the 2.5" collector, the second run was with the ASP 4-2-1 merge to a 3" collector. The car had more midrange with the ASP header, but seemed to run out of breath above 6000. I have since upgraded the exhaust to a 3" OEM catback and it now screams to redline. I haven't had the chance to redyno as I am waiting for my Calum realtime, but I'm going to guarentee it is more than 185. The 3" really let the ASP header come alive.
2009-07-04 04:56:15
#10
Originally Posted by eggman
so am I seeing that right the ssac made more HP and Torque than the ASP
Makes me think I should have spent that $ on N1 cams,instead of the ASP.


Yes and No. The SSAC was done before I had the SAFC, and the car was real lean uptop - typical of JWT tunes I've seen. We tuned with the SAFC to be 100% safe at the track at WOT, I knew it would be driven hard at Roebling. I was willing to trade a little HP off the top to keep the afr's on the safe side. The torque results are the same.

The ASP def helps in the midrange, which is what Charles told me it would do.
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