Virtual Dyno '90 NA with '99 BP4W
#1
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I recently refreshed my engine so I wanted to see what this rig was doing on the virtual dyno.
Car: 1990 NA; No PS, No AC, Hard dog single diagonal. Weight was a guess at 2150#
Engine: '99 BP4W, Ebay NPR vvt pistons... With head shave I think 10.625:1 comp. Running on 93 Pump.
Head: BP4W shaved .025", NA8 valve springs and BP5A intake cam, intake/exhaust ports cleaned up of casting defects
Intake: VICS with casting defects smoothed to 220 grit finish, 2.5" aluminum tube from there to a K&N behind driver side headlight
Exhaust: riceland header, OBX resonated cat delete, 2.375" enthuza resonated midpipe which is then necked to a 2.25" with a vibrant resonator
Drivetrain: 10# FW, Factory clutch, nb1 6 speed, 4.3 Torsen
ECU: Rev built MS2; MSQ attached.
Conditions: Exact same road, all 3 runs within 45 min of each other. 29.98 in/Hg @ 65F, All pulls done in 4TH gear.
Car previously went 9.15 @ 74.5 mph (1/8th mile, 1.89 60' on 22x8 slicks) on the factory pistons (burning a qt of oil every 225-250 miles)
![Name: 051417%20Baseline%20correct%20tire%20height_zpsrcijz5wf.jpg
Views: 1010
Size: 85.0 KB](https://www.miataturbo.net/attachments/dynos-timesheets-21/180878d1501200084-virtual-dyno-90-na-99-bp4w-051417%2520baseline%2520correct%2520tire%2520height_zpsrcijz5wf.jpg)
Red Line: VICS set at 5200
Green Line: VICS set at 5000
Blue Line: VICS set at 5400
I fixed the lean dip in the red graph and stayed with VICS activation at 5200 as I believe the factory set up is. What should I look toward next to maximize this setup? I've been doing a lot of reading on here and i'm thinking of moving up to a 2.5" exhaust and see where that takes the car. I've attached my **** show of a tune (It's basically a stock 1.6 tune because I don't know wtf i'm doing) if any of you cats have suggestions there.
**Ninja edit, in the interest of providing the most accurate data possible I revised the tire height in VD to a 205/50-15 23.1"
Car: 1990 NA; No PS, No AC, Hard dog single diagonal. Weight was a guess at 2150#
Engine: '99 BP4W, Ebay NPR vvt pistons... With head shave I think 10.625:1 comp. Running on 93 Pump.
Head: BP4W shaved .025", NA8 valve springs and BP5A intake cam, intake/exhaust ports cleaned up of casting defects
Intake: VICS with casting defects smoothed to 220 grit finish, 2.5" aluminum tube from there to a K&N behind driver side headlight
Exhaust: riceland header, OBX resonated cat delete, 2.375" enthuza resonated midpipe which is then necked to a 2.25" with a vibrant resonator
Drivetrain: 10# FW, Factory clutch, nb1 6 speed, 4.3 Torsen
ECU: Rev built MS2; MSQ attached.
Conditions: Exact same road, all 3 runs within 45 min of each other. 29.98 in/Hg @ 65F, All pulls done in 4TH gear.
Car previously went 9.15 @ 74.5 mph (1/8th mile, 1.89 60' on 22x8 slicks) on the factory pistons (burning a qt of oil every 225-250 miles)
![Name: 051417%20Baseline%20correct%20tire%20height_zpsrcijz5wf.jpg
Views: 1010
Size: 85.0 KB](https://www.miataturbo.net/attachments/dynos-timesheets-21/180878d1501200084-virtual-dyno-90-na-99-bp4w-051417%2520baseline%2520correct%2520tire%2520height_zpsrcijz5wf.jpg)
Red Line: VICS set at 5200
Green Line: VICS set at 5000
Blue Line: VICS set at 5400
I fixed the lean dip in the red graph and stayed with VICS activation at 5200 as I believe the factory set up is. What should I look toward next to maximize this setup? I've been doing a lot of reading on here and i'm thinking of moving up to a 2.5" exhaust and see where that takes the car. I've attached my **** show of a tune (It's basically a stock 1.6 tune because I don't know wtf i'm doing) if any of you cats have suggestions there.
**Ninja edit, in the interest of providing the most accurate data possible I revised the tire height in VD to a 205/50-15 23.1"
Last edited by tehzack; 05-14-2017 at 10:38 AM. Reason: Corrected tire height in VD
#2
Cpt. Slow
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You'll really want to visit a dyno. Looks like some decent gains are available through VICS tuning alone. I usually see it in VVT heads, but it looks like you could benefit from multiple VICS crossovers, but it's difficult to tell with just VD.
Do a run with VICS at 1000rpm, then a run with VICS at 9000. Your settings are correct when the next run follows the highest line out of the first 2.
Do a run with VICS at 1000rpm, then a run with VICS at 9000. Your settings are correct when the next run follows the highest line out of the first 2.
#3
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Interesting, the green line suggests there may be some benefit to switching at 4800 perhaps.
Maybe back at 5000 then again at 5200. Would you implement this by simply adding another 2 on off outputs for VICS?
Maybe back at 5000 then again at 5200. Would you implement this by simply adding another 2 on off outputs for VICS?