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Old 10-13-2012, 02:03 PM   #1
subbi7
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Default intercooler efficency

hi !
while i was tunning my car i saw that the air temp after the intercooler on wot was 158f and the ambiant temp was 85f .

is it ok?
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Old 10-13-2012, 02:09 PM   #2
the suicidal eggroll
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How were you measuring the air temp after the intercooler?
What turbo/boost/other mods?

In general, no, that's horrifically hot. That said, you've given us absolutely no information to work off of, so who knows.
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Old 10-13-2012, 02:30 PM   #3
subbi7
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sorry for the miss of info...
it gt30 bolt on turbo with "big" top mount intercooler on 1.4 bar of boost.
i run haltech ecu and the air temp sensor located after the intercooler.
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Old 10-13-2012, 03:02 PM   #4
the suicidal eggroll
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gt30 is too big for a TMIC IMO, and you're seeing why. Unless you're running water injection or something else to help cool it back down, TMICs just don't have the necessary air flow from the hood scoop to cool that much charge air.

For comparison's sake, I'm running a rotated gt30 with a Turbo XS FMIC and my IAT/MAF located in blow-through. At 20 psi WOT and 85 deg atmospheric, my post-IC IAT is around 90, 95 if I'm coming right off of a heat-soaked idle. 90 deg air is 11% more dense than 158 deg air. That means 11% more air at the same pressure, and close to 11% more power, even ignoring the fueling/timing compromises you'd have to make to keep 158 deg air from preigniting.

Last edited by the suicidal eggroll; 10-13-2012 at 04:47 PM. Reason: typo
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Old 10-13-2012, 04:39 PM   #5
NSFW
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OMG, an intercooler thread with actual temperature measurements.

Kudos to both of you.

Sounds like a GT30 really does need a FMIC.
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Old 10-13-2012, 04:42 PM   #6
subbi7
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so what is youre whp/tq?
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Old 10-13-2012, 04:51 PM   #7
the suicidal eggroll
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Quote:
Originally Posted by subbi7 View Post
so what is youre whp/tq?
Don't know. Last time I was on a dyno it made 340whp at 16.5 psi on 93 octane and the stock motor at close to sea level. I'm now running a hair over 20 psi (more once I get a new MAP sensor) on E85 at 5300 ft with higher compression and head work. So your guess is as good as mine.
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Old 10-13-2012, 04:54 PM   #8
subbi7
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how boost is safe in 93 oct?
p.s tanks for the help
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Old 10-17-2012, 10:40 AM   #9
DerekB707
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What TMIC are you running?
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Old 10-17-2012, 03:15 PM   #10
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I'm interested what top mount you are running too. Also was this measured on the road? If so what gear? Are you running any sort of a splitter?
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Old 10-17-2012, 03:22 PM   #11
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Quote:
Originally Posted by Big_DeWeY View Post
Are you running any sort of a splitter?
^this is key!!
YOu need a splitter/seal to direct as much air as possible over the TMIC
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Old 10-17-2012, 07:01 PM   #12
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Quote:
Originally Posted by Paul View Post
^this is key!!
YOu need a splitter/seal to direct as much air as possible over the TMIC
Totally agree. Air will always take the path of least resistance. If there isn't a splitter then the path if least resistance is over the back of the intercooler and down the firewall. This is why there is a MASSIVE misconception to what you can and can't run with a top mount.
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Old 10-19-2012, 09:33 AM   #13
thisisntjared
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Quote:
Originally Posted by DerekB707 View Post
What TMIC are you running?
i would like to know as well...
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Old 10-19-2012, 12:35 PM   #14
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Quote:
Originally Posted by the suicidal eggroll View Post
Don't know. Last time I was on a dyno it made 340whp at 16.5 psi on 93 octane and the stock motor at close to sea level. I'm now running a hair over 20 psi (more once I get a new MAP sensor) on E85 at 5300 ft with higher compression and head work. So your guess is as good as mine.
Where are you taking tour post intercooler temp measurement and with what type of sensor?
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Old 10-19-2012, 04:56 PM   #15
1QUIKV6
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You can actually make good short term power with one of the upgraded TMIC's but keeping that power thru multiple pulls is near impossible. There just isn't enough real estate and airflow. Providing you aren't trying to road course the high(er) temps with a TMIC aren't the end of the world on E85 as knock isn't an issue. You just take a slight power hit when you've been n the gas for awhile.

158F is kinda crappy though. My ETS TMIC in 100F ambient (AZ) will hit around 138F post IC during a 4th gear 2000-7500 rpm pull at 26 psi and 3000' altitude (3.0XT-R). Although the retune/checks are done I haven't paid attention to WOT IAT's since I moved to KS a few weeks ago. Been digging seeing <70F IAT's while putting around though.
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Old 10-20-2012, 09:58 AM   #16
the suicidal eggroll
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Quote:
Originally Posted by kellygnsd View Post
Where are you taking tour post intercooler temp measurement and with what type of sensor?
As I mentioned in post #4, I'm using the stock IAT in blow through.
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Old 10-20-2012, 12:35 PM   #17
subbi7
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its custom top mount very big.
im running the splitter+water spray on it...
and still high temp..
im really didnt want to go with fmic (because of turbo response)
but it seems that i have no other options...
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Old 10-20-2012, 01:16 PM   #18
the suicidal eggroll
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Quote:
Originally Posted by subbi7 View Post
im really didnt want to go with fmic (because of turbo response)
On a gt30 it's not going to make much, if any difference.

Last edited by the suicidal eggroll; 10-20-2012 at 06:13 PM. Reason: typo
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Old 10-20-2012, 04:40 PM   #19
aboothman
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Agreed. You will learn to roll into the throttle quickly enough anyway. My 30r w/ fmic is responsive enough to be fun... Unless I expect to go WOT at 2500 RPMs and move instantly. It actually changed the way I drive turbo vehicles I'm general... Whether my swapped GC, or my work f450 or International
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