Heading back to the Dyno
Originally Posted by MalibuJack
Look in the car configuration editor in Data Log Lab.. I actually used a basic calculation I had found online to measure the frontal area and calculate the CD (coefficient of drag) however I later found those values for the Evo7 and used those instead.
Keep in mind that your CD values will be different if you have a spoiler or not, and a front splitter or not.. since the additional downforce helps high speed stability, but increases drag pretty significantly..
You'd be surprised that you can pick up MPH at the drag strip by removing your spoiler before you go but the rear of the car feels alot lighter at high speed.
Keep in mind that your CD values will be different if you have a spoiler or not, and a front splitter or not.. since the additional downforce helps high speed stability, but increases drag pretty significantly..
You'd be surprised that you can pick up MPH at the drag strip by removing your spoiler before you go but the rear of the car feels alot lighter at high speed.
1. The Evo curb weight is listed @ 3263 lbs. What does that number include? Does it include the gas in the car? Or is it for the car dry? How accurate is that number?
2. I imagine that the content weight is for one person in the car. It is set @ 200 lbs. Since I weigh around 170, then I should set mine to that. Correct?
3. There is a radio button labeled "known characteristics" and it has two little windows with 110 hp and 115 mph in them. What are those? Should I modify these?
4. Are the listed coefficient of drag and frontal area numbers listed accurate? What did you use in yours MJ?
Thanks for helping me with this
Thread Starter
Evolved Member
iTrader: (17)
Joined: Aug 2004
Posts: 3,275
Likes: 0
From: In da streetz
Originally Posted by MalibuJack
your moving a different mass on the dyno than when you drive the car, but I'm assuming you meant the torque numbers on your road tuning sessions were way off.. There are a few variables at work, and every car is a little different.
Your dyno #'s don't suck for an 04 with stock cams. I say peak numbers provide no guarantee for speed, and furthermore the graph you posted looks wide to me and 12.4 ET is not bad at all.
There still is some power to tap with the hotside mod if you get cams. If 24 psi was run on pump gas, the torque might will be low from knock. FMIC wont really help untill more air is flowing (turbo, cams, 27 psi) and sometimes you lose efficiency.
I'd say send this off to the turbo/drivtrain threads for review
There still is some power to tap with the hotside mod if you get cams. If 24 psi was run on pump gas, the torque might will be low from knock. FMIC wont really help untill more air is flowing (turbo, cams, 27 psi) and sometimes you lose efficiency.
I'd say send this off to the turbo/drivtrain threads for review
Thread Starter
Evolved Member
iTrader: (17)
Joined: Aug 2004
Posts: 3,275
Likes: 0
From: In da streetz
well last night at the track I got some of the proof I was looking for, although it wasn't 100% conclusive because I was using race gas...
The first pass I made was with the tune I generate on the dyno which yeilded me the highest output of 319hp & 308tq. I went 12.5 @ 110.3 with trap of 85 in the 1/8th. This is about the average speed my car runs in the 1/4. Although I usually run a 24psi spike this time my boost peaked at a maximum of 22.4psi in 4th gear and the A/F's were in the high 10s for most of the pass due to the 103 octain fuel.
Second pass I missed second gear so it didn't count.
Third pass I loaded my 'street tune' back into the ECU. I turned the boost up a full turn on the MBC, trying to take advantage of the race fuel, but it only netted me a peak of 23.88psi in 4th. On that run I went 12.5 again but got my highest trap ever, 86.8 in the 1/8th & 111.08 in the 1/4!
I know this isn't a true apples to apples comparison because I was on race gas instead of 93 octain like I usually run, and my boost wasn't the same on both passes. But in my eyes it shows me that even though I gained 18hp on the dyno it didn't translate into a REAL gain on the street. And the tune that I came to the dyno with, which was actually less powerful then when I left the dyno back in June, made the most power on the track. If that makes any sense.
I'm still going to get back to the track for more pump gas runs but probably not for another few weeks.
The first pass I made was with the tune I generate on the dyno which yeilded me the highest output of 319hp & 308tq. I went 12.5 @ 110.3 with trap of 85 in the 1/8th. This is about the average speed my car runs in the 1/4. Although I usually run a 24psi spike this time my boost peaked at a maximum of 22.4psi in 4th gear and the A/F's were in the high 10s for most of the pass due to the 103 octain fuel.
Second pass I missed second gear so it didn't count.
Third pass I loaded my 'street tune' back into the ECU. I turned the boost up a full turn on the MBC, trying to take advantage of the race fuel, but it only netted me a peak of 23.88psi in 4th. On that run I went 12.5 again but got my highest trap ever, 86.8 in the 1/8th & 111.08 in the 1/4!
I know this isn't a true apples to apples comparison because I was on race gas instead of 93 octain like I usually run, and my boost wasn't the same on both passes. But in my eyes it shows me that even though I gained 18hp on the dyno it didn't translate into a REAL gain on the street. And the tune that I came to the dyno with, which was actually less powerful then when I left the dyno back in June, made the most power on the track. If that makes any sense.
I'm still going to get back to the track for more pump gas runs but probably not for another few weeks.
Thread
Thread Starter
Forum
Replies
Last Post
tscompusa
Evo Dyno Tuning / Results
4
Aug 14, 2017 10:14 PM
evodave
Drag Racing
41
Oct 3, 2005 01:14 PM
