Some datalogs from a 3 car dyno session last friday. enjoy.



19% with Rogue Intake
JCW with Rogue Intake
15% with K&N panel filter

That 19% gets the air pretty hot.

Paul

 

>>
>>Some datalogs from a 3 car dyno session last friday. enjoy.
>>
>>

 

>>>>
>>What? Not satisfied with the free JCW
>> :smile:

Paul

 

Paul,

Where was this temperature taken? After the supercharger, but before the intercooler? I am assuming that the air temp is in Farenheit. Also, what was the outside air temperature?

 

>>Paul,
>>
>>Where was this temperature taken? After the supercharger, but before the intercooler? I am assuming that the air temp is in Farenheit. Also, what was the outside air temperature?

It was 58.65F in the dyno bay. The temp is done by the onboard computer at the intake manifold, post intercooler. We gather this temp using an OBDII datalogger.

Paul

 

Paul,

It appears that the temp got to about 190 at redline with the 19%. Did you notice any computer problems with the temp getting this high? There was some suspicion that the computer would dump a lot of fuel if the temperature got to high.

I am assuming that this was with the stock intercooler also. It would be interesting to see the affects with a larger intercooler.

 

Good info, Paulmon! Extra special kudos for keeping the starting temps the same for all 3 cars.

FYI, the sensor that is reporting the IAT is the black rectangle at the bottom of this pic:



It's located in the intake manifold, roughly across from the #4 intake runner and measures both temp and pressure (it's a TMAP sensor).

I have seen high temps like that on the dyno as well, on the next dyno run, I'll calculate the intercooler efficiency. I suspect it will be very poor (well under 50%) due to the lack of airflow. On the road, I have observed a much smaller difference between 15% and 19%. I'll dig up some graphs to post.

 

>>Good info, Paulmon! Extra special kudos for keeping the starting temps the same for all 3 cars.
>>

Just taking your lead Andy. :smile:

>>I have seen high temps like that on the dyno as well, on the next dyno run, I'll calculate the intercooler efficiency. I suspect it will be very poor (well under 50%) due to the lack of airflow. On the road, I have observed a much smaller difference between 15% and 19%. I'll dig up some graphs to post.

We did a 4th gear pull on the highway after this, maximum intake temp was 125F on a day that was 48F outside. I think in dynoing I'd want a maximum intake temp of 150F. However we'll do more of this in time. I want to come up with a good intake temp average for dynoing the car.

Cheers,

Paul

 

Looking back at several dyno runs with the 15% pulley, starting IAT temps were between 90 and 100F, and by 7,000 rpm, IAT temps were between 155 and 185 F.

 

>>Looking back at several dyno runs with the 15% pulley, starting IAT temps were between 90 and 100F, and by 7,000 rpm, IAT temps were between 155 and 185 F.

That sounds about right. The results were very interesting. We stood there, in front of the dyno, speculating whether a bag of ice or a fan blowing on the IC would constitute cheating. We only used the fan since we didn't have any ice; may be next time.

To sum things up the peak IAT were as follows:

Mike = 167F (158F) on the Dyno
Paul = 174F (167F) on the Dyno
Kev = 192F (174F) on the Dyno

These peaks were reached within two seconds after the throttle was closed after the run. The numbers in brackets are the IAT while still at WOT.

So there are some differences in heat generated. The question became, how representative of the real world would a bag of ice on the IC be? Well, lets find out what the IAT differences on the road would be. To do this I datalogged numerous 4th gear pulls on the road that would mimic the dyno pulls. The results were very interesting.

Kev = 125F (120F) on the road

That basically put, the IC and the hood scoop work. At thenext dyno session, I will bring a bag of ice to see whether I can keep the IAT similar to what would be experienced on the road. I think that the 70F+ IAT drop on the road would be good for another 15-20whp.

Comments?

 

Woudln't first gear be a better choice for road data logging of IAT? Even though a 1st gear pull is shorter than a 4th gear pull, the intercooler will see less air flow in 1st gear so temps will probbaly be hotter.

I believe the WRX, which also has a top-mount intercooler, has boost limited in 1st & 2nd gear for this reason.

 

My car is traction-limited in first gear, so I couldn't do any useful logs.

 

>>My car is traction-limited in first gear, so I couldn't do any useful logs.


Ahhh - good point