tehzack

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)



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"

curly

iTrader: (25)

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.

sonofthehill

iTrader: (1)

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?

curly

iTrader: (25)

No, you'd add an "and" condition to the VICS on/off channel. So on <5000 and >5200 if that's what the dyno shows. I'd really suggest doing this on the dyno.

sonofthehill

iTrader: (1)

Thanks for the info!

tehzack

Thanks for the heads up Curly, it'd definitely be a good idea to put this on an actual dyno to dial everything in. I totally forgot to do what you suggested and do a run with it always on, and then always off to see where they cross. I've read that a hundred times on here, doh!

pdexta

iTrader: (17)

Great numbers and sounds like a really fun setup. I've always wanted to build a similar car (light, n/a, with silly short gearing) for zipping around in. Any E85 in your area? I bet with the higher compression you'd find some reasonable power.

pdexta

iTrader: (17)

Great numbers and sounds like a really fun setup. I've always wanted to build a similar car (light, n/a, with silly short gearing) for zipping around in. Any E85 in your area? I bet with the higher compression you'd find some reasonable power.

tehzack

Not within a good distance. Car is my daily so i've not pursued that avenue.