Back to the Texas Mile
08-18-2016, 10:22 AM
#17
Racer
Thread Starter
The ACT is correct but the measurement is taking at peak TQ. 4200-4500 rpm range. At the 6700 the temp is 94. Not bad considering the compressor exit temps are 307 and on a Dyno
An open road pull
AIT 82
ACT 76 at 100mph.
It would be interesting to see how quick the intercooler can heat cycle like in a road race situation.
WOT stuff the intercooler works well. I need to go back to my old Texas mile data log and check
An open road pull
AIT 82
ACT 76 at 100mph.
It would be interesting to see how quick the intercooler can heat cycle like in a road race situation.
WOT stuff the intercooler works well. I need to go back to my old Texas mile data log and check
08-18-2016, 12:12 PM
#19
Rennlist Member
For comparison my post turbo temps were 190 (90 celsius) ish at the end of front straight at the track (150ish MPH) with post intercooler temps 86 (30 celcius) - but on a 68 (20 celsius) ambient day. I've noticed that post intercooler temps were only 3 degrees (celcius) above airbox temp at the start of the straight - 4K rpm in 3rd gear, but didn't think post intercooler temps could be below ambient? Airbox temp fluctuates some by a few degrees but is always above ambient and post intercooler temps always above airbox temp I think? (you have a 75 under ACT). My ignition angle seems to stay 15 -17 degrees ish on race gas (104 octane) under load, have seen it quite a bit lower on 92 octane and have taken to using race gas on the track.
Anyways, having airbox and post intercooler temps very similar under load is pretty amazing.
Anyways, having airbox and post intercooler temps very similar under load is pretty amazing.
08-18-2016, 03:35 PM
#20
Rennlist Member
Well, you've mentioned it twice now with the ACT (post intercooler temp right?) being in the 70's (lower than air box temp) so that must be what you are seeings.
Intercooler efficiency is (T in - T out) / (T in - Ambient or say air box) so from your post #17, (307-94)/307-82) = 95%
during the 100 mph run, (307-76)/(307-82) = 102% efficiency. Most good intercoolers run at about 70% I believe.
Only way I think that could be possible is that there is a moderate pressure drop across the intercooler at full load? where is your temp sensor - in the intercooler before the intake?
Not doubting your numbers just trying to understand. Have you figured out something really interesting in the way you have your intercoolers set up??? The intercoolers are so large that the expansion itself is causing good temp drop? Or am I not thinking about this right?
Intercooler efficiency is (T in - T out) / (T in - Ambient or say air box) so from your post #17, (307-94)/307-82) = 95%
during the 100 mph run, (307-76)/(307-82) = 102% efficiency. Most good intercoolers run at about 70% I believe.
Only way I think that could be possible is that there is a moderate pressure drop across the intercooler at full load? where is your temp sensor - in the intercooler before the intake?
Not doubting your numbers just trying to understand. Have you figured out something really interesting in the way you have your intercoolers set up??? The intercoolers are so large that the expansion itself is causing good temp drop? Or am I not thinking about this right?
08-18-2016, 11:06 PM
#22
Racer
Thread Starter
Air box temps are must not be accurate. My guess is the location of the sensor in the box doesn't get the air flow. When I look at the last Texas mile run, the air box temps was reading 105 but the ambient temp was 80. The ACT was 95 at the end of the run.The air box must be heat soak and the sensor is located in the back corner of the box. Not in the air stream. Next time I pull the engine I will relocate the sensor
Basal, I think I sent you the data log for the mile. You can check it out.
At the current power I can run the the engine for about 30 seconds WOT before the 25 lb chunk of paper thin aluminum gets heat soaked and the tune starts to pull timing. 30 seconds is a long time at WOT
More interesting would be testing on a road course. I believe the intercooler would heat cycle very fast.
200 more not 300
Basal, I think I sent you the data log for the mile. You can check it out.
At the current power I can run the the engine for about 30 seconds WOT before the 25 lb chunk of paper thin aluminum gets heat soaked and the tune starts to pull timing. 30 seconds is a long time at WOT
More interesting would be testing on a road course. I believe the intercooler would heat cycle very fast.
200 more not 300
10-28-2016, 11:13 AM
#27
Tacker,
Do you think your car would go faster without the huge wing on the back of the car? The factory wing puts a ton of down-force on the car especially at super high speeds. Just wondering.
Do you think your car would go faster without the huge wing on the back of the car? The factory wing puts a ton of down-force on the car especially at super high speeds. Just wondering.
10-28-2016, 11:18 PM
#29
Racer
Thread Starter
guys,
having a tough time. I ran 3x today at 24 psi
1/4, 1/2, 1 mile
132,161,192
130,158,190
128,159,189
IIRC slips are not handy
Im having High CHT temps. Bank 1, and Bank 2 are 50 degrees apart. otherwise running good.
I will update soon
having a tough time. I ran 3x today at 24 psi
1/4, 1/2, 1 mile
132,161,192
130,158,190
128,159,189
IIRC slips are not handy
Im having High CHT temps. Bank 1, and Bank 2 are 50 degrees apart. otherwise running good.
I will update soon
10-29-2016, 01:19 AM
#30
Rennlist Member
hmm that's too bad
your numbers were better last time before the last set of mods.
what do you think is going on? odd that head temps are different between the banks.
your numbers were better last time before the last set of mods.
what do you think is going on? odd that head temps are different between the banks.