How slow is my car?
Thread Starter
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
How slow is my car? Had my first ever track outing tonight. The evening started off pretty hot but eventually cooled down and I got one OK pass in. Car felt good, just seems like I am down on power somewhere.
'84 fox body, full interior, no weight removal
5.3 ~9.5:1 compression
Stock 241 Heads w/ Lunati single spring
TFS 216/220 cam
S475 1.10 A/R, 83mm
TH400
Running on 110 octane and 18psi/11-12 degrees. Tune looked good. I know the 60' sucked but I still think I should trap quite a bit more. Converter slip was only 7%. The only thing that looked weird in the log was the IAT. I have a big Precision A2A cooler and there was about a 70 degree rise throughout the pass from 105-175*F. Seems to be using fuel, about 80% peak DC on the 80lb injectors in 3rd.
Best pass was of the night was
60 - 1.60
330 - 4.35
1/8 - 6.61 @ 109
1/4 - 10.23 @ 135
How far off am I?
'84 fox body, full interior, no weight removal
5.3 ~9.5:1 compression
Stock 241 Heads w/ Lunati single spring
TFS 216/220 cam
S475 1.10 A/R, 83mm
TH400
Running on 110 octane and 18psi/11-12 degrees. Tune looked good. I know the 60' sucked but I still think I should trap quite a bit more. Converter slip was only 7%. The only thing that looked weird in the log was the IAT. I have a big Precision A2A cooler and there was about a 70 degree rise throughout the pass from 105-175*F. Seems to be using fuel, about 80% peak DC on the 80lb injectors in 3rd.
Best pass was of the night was
60 - 1.60
330 - 4.35
1/8 - 6.61 @ 109
1/4 - 10.23 @ 135
How far off am I?
Thread Starter
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
The image didn't come through as good as I hoped, boost is the red 18.00 near the center. It left on 23* and just slopes down to the 11-12* from there.
Last edited by svslow; Sep 21, 2016 at 10:49 PM.
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Verdad Gallardo Thread Starter
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
Thanks! It was way too hot early on. I pretty much leave off idle. No trans brake and my brakes aren't good enough to hold the car back.
Need to get the weight of the chassis to guess... Trap speed won't be affected much by a poor track surface...et will. I'd guess you have some MPH hidden in that combo for sure. Keep an eye on your converter slip and sneak up on the tune a degree at a time watching MPH and plugs.
Sure you're still at 9.5:1 with the larger 67cc 241 heads and LS9 gasket?
for comparison I believe I went 143 at 3000lbs on 17lbs with a very similar combo... only 2900lbs though... Also 175 is pretty darn high IAT wise. I'm under 130* at 20lbs on my combo with temps starting in the 100* range similar to yours. Using the 1200hp treadstone core.
Sure you're still at 9.5:1 with the larger 67cc 241 heads and LS9 gasket?
for comparison I believe I went 143 at 3000lbs on 17lbs with a very similar combo... only 2900lbs though... Also 175 is pretty darn high IAT wise. I'm under 130* at 20lbs on my combo with temps starting in the 100* range similar to yours. Using the 1200hp treadstone core.
Last edited by Forcefed86; Sep 22, 2016 at 08:41 AM.
I was thinking the timing was kind of low for 110 also-reading the plugs would help, but its hard at a track, limited passes, and you need to pull them right after a pass for an accurate reading.
You are not far off from a 9 sec pass though-what plugs are you running
You are not far off from a 9 sec pass though-what plugs are you running
Thread Starter
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
The motor is 9.5:1 with Wiseco pistons. I'm just using LS1 MLS head gaskets. I will go back out again here in the next couple week when it's hopefully cooler outside. Maybe try a hair more timing.
Thread Starter
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
br7ef
I’d look into the IAT thing, somethings off there. Maybe test your sensor or try another? What are the IC dimensions? Even when I ran the cheapie ebay cooler (32x12x3) I only saw 170 at 25+ lbs when it was 90* or so ambient. (same turbo as u run on a 5.3)
You usually go by ambient temps VS IAT, not the heat soaked under hood temps reported by the IAT while staging. So if it was 80* ambient, that’s a 90* rise. Do you have fresh air supplied to the turbo? or is it sucking in hot engine bay air? My under hood temps and starting IAT are similar to yours always. But as soon as I start the run they drop down, then start to climb.
You usually go by ambient temps VS IAT, not the heat soaked under hood temps reported by the IAT while staging. So if it was 80* ambient, that’s a 90* rise. Do you have fresh air supplied to the turbo? or is it sucking in hot engine bay air? My under hood temps and starting IAT are similar to yours always. But as soon as I start the run they drop down, then start to climb.
Had my first ever track outing tonight. The evening started off pretty hot but eventually cooled down and I got one OK pass in. Car felt good, just seems like I am down on power somewhere.
'84 fox body, full interior, no weight removal
5.3 ~9.5:1 compression
Stock 241 Heads w/ Lunati single spring
TFS 216/220 cam
S475 1.10 A/R, 83mm
TH400
Running on 110 octane and 18psi/11-12 degrees. Tune looked good. I know the 60' sucked but I still think I should trap quite a bit more. Converter slip was only 7%. The only thing that looked weird in the log was the IAT. I have a big Precision A2A cooler and there was about a 70 degree rise throughout the pass from 105-175*F. Seems to be using fuel, about 80% peak DC on the 80lb injectors in 3rd.
Best pass was of the night was
60 - 1.60
330 - 4.35
1/8 - 6.61 @ 109
1/4 - 10.23 @ 135
How far off am I?
'84 fox body, full interior, no weight removal
5.3 ~9.5:1 compression
Stock 241 Heads w/ Lunati single spring
TFS 216/220 cam
S475 1.10 A/R, 83mm
TH400
Running on 110 octane and 18psi/11-12 degrees. Tune looked good. I know the 60' sucked but I still think I should trap quite a bit more. Converter slip was only 7%. The only thing that looked weird in the log was the IAT. I have a big Precision A2A cooler and there was about a 70 degree rise throughout the pass from 105-175*F. Seems to be using fuel, about 80% peak DC on the 80lb injectors in 3rd.
Best pass was of the night was
60 - 1.60
330 - 4.35
1/8 - 6.61 @ 109
1/4 - 10.23 @ 135
How far off am I?
Thread Starter
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
I’d look into the IAT thing, somethings off there. Maybe test your sensor or try another? What are the IC dimensions? Even when I ran the cheapie ebay cooler (32x12x3) I only saw 170 at 25+ lbs when it was 90* or so ambient. (same turbo as u run on a 5.3)
You usually go by ambient temps VS IAT, not the heat soaked under hood temps reported by the IAT while staging. So if it was 80* ambient, that’s a 90* rise. Do you have fresh air supplied to the turbo? or is it sucking in hot engine bay air? My under hood temps and starting IAT are similar to yours always. But as soon as I start the run they drop down, then start to climb.
You usually go by ambient temps VS IAT, not the heat soaked under hood temps reported by the IAT while staging. So if it was 80* ambient, that’s a 90* rise. Do you have fresh air supplied to the turbo? or is it sucking in hot engine bay air? My under hood temps and starting IAT are similar to yours always. But as soon as I start the run they drop down, then start to climb.
