New Dyno runs with Borla Catback & Toms Filter
05-23-12, 07:13 AM
#31
Most/All modern engine ECUs will pull timing in relation to the IAT. As an example, the Subaru ECU pulls 4 or more degrees of timing when IAT reaches 150is degrees F. That is a pretty big hit on performance. Of course - the purpose is to protect the motor from knocking because of the warmer (less dense) air charge.
05-23-12, 07:14 AM
#32
Lexus Champion
Yes and no I would say everything is at operating temperature since I did 4 passes to 175mph all within 15 minutes except I'm cooling the radiator down for 10 minutes to achieve the best numbers, but also if it was 40 degrees here not 90 and humid I would not have these issues. We are thinking to try putting in a cooler thermostat and run a different coolant mixture with water wetter to see if we can correct this problem of retarding timing after 5200rpms. It's very strange cause when it's cooled for 10min it feels as of it hits another power band @5200 vs falling flat and dull when it's not.
05-23-12, 08:54 AM
#33
Lead Lap
Join Date: Jul 2011
Location: KS
Posts: 746
Likes: 0
Received 0 Likes
on
0 Posts
If its the coolant, have you heard about Engine Ice? I've thought about running this. If your willing to experiment
*A note on modern street automobiles:
Newer model street automobiles are equipped with a massive amount of electronic and computerization equipment to keep your passenger car operating at what the manufacturer wants the engine to operate at. One analogy we use, and we agree it's a bit simplistic, is that even if you filled your radiator with ice cubes, the computer system would hold the thermostat and monitoring equipment until it reaches its pre-programmed operating temperature. Bottom line is, you'll probably only reduce the overall temperature by a couple of degrees due to the thermostat opening and closing or "feathering" in order to maintain its preprogrammed and desired temperature. Keep in mind; we are talking stock, unmodified passenger cars, not racing cars.
05-23-12, 09:21 AM
#35
Lead Lap
iTrader: (1)
Join Date: Jul 2006
Location: Washington
Posts: 639
Likes: 0
Received 0 Likes
on
0 Posts
I think that more accurate data should be collected about coolant temps before putting things in your coolant. The car is designed to operate at a certain coolant temperature and you may hinder performance and be wasting your money buy adding things like that to your coolant. I've always heard adding a drop of dawn dish soap has the same effect as this stuff.
I'm sure the issues are more to do with IAT, and not coolant temps.
I'm sure the issues are more to do with IAT, and not coolant temps.
05-23-12, 09:47 AM
#36
Lexus Champion
Nice Runs JB, I have practically the same mods I'm wanting to dyno my car curious as to what it is making to the wheels. I thought smoothing was set to 5. I will have to check out rage tek. Anyway looking forward to your post headers dyno results. Anyway since you and Slay are local shoot me a PM guys maybe we can all meet up.
05-23-12, 10:01 AM
#38
05-23-12, 10:38 AM
#40
Lexus Fanatic
iTrader: (10)
Join Date: Nov 2004
Location: Under an IS F since 2008
Posts: 13,441
Received 1,063 Likes
on
586 Posts
Trust me I'm not hating.. Just trying to educate members on realistic data for the IS-F
Cooling down the motor during our exhaust R&D in 2008 gave us a 39 rwhp gain...
But I would never state or even mention that our exhaust made almost 40 Rwhp.. LoL ...
The realistic number was and always will be approx 20-22 Rwhp in gains, for a nicely fabricated Full Cat Back exhaust system..
Also, my opinion is just my opinion.. But if the OP wanted, he can easily graph a dyno sheet showing over 400+ Rwhp..
Best Regards,
~ Joe Z
Last edited by Joe Z; 05-23-12 at 10:52 AM.
05-23-12, 10:49 AM
#44
Lexus Champion
