APTEN Results!
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Joined: Oct 2003
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The difference between the two is that the base pull was on a JDM race tune (20 degrees timing). We did an after pull on the same tune first and it made 441RWHP. But then we backed it down to the street tune and it made in the 430's range. The street tune has 15 degrees. We then did some testing and picked up another 8rwhp with one of our upcoming bolt-ons.
There was some control on the testing, we made sure that the truck was up to the same temperature and heated up.
Brian
There was some control on the testing, we made sure that the truck was up to the same temperature and heated up.
Brian
Last edited by Apten_Tech; Mar 10, 2004 at 11:31 AM.
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Joined: Sep 2002
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From: Ottawa, Canada
Originally posted by Apten_Tech
The difference between the two is that the base pull was on a JDM race tune (20 degrees timing). We did an after pull on the same tune first and it made 441RWHP. But then we backed it down to the street tune and it made in the 430's range. The street tune has 15 degrees. We then put another one of our prototype parts on and picked up another 8RWHP.
There was some control on the testing, we made sure that the truck was up to the same temperature and heated up.
Brian
The difference between the two is that the base pull was on a JDM race tune (20 degrees timing). We did an after pull on the same tune first and it made 441RWHP. But then we backed it down to the street tune and it made in the 430's range. The street tune has 15 degrees. We then put another one of our prototype parts on and picked up another 8RWHP.
There was some control on the testing, we made sure that the truck was up to the same temperature and heated up.
Brian
If I read it right then.. WOW!!
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Joined: Sep 2002
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From: Ottawa, Canada
Originally posted by Apten_Tech
I believe the 438RWHP was the last pull where our other new product was being tested in addition, and it was more like 430RWHP with the timing lowered just with swapping the blower.
Brian
I believe the 438RWHP was the last pull where our other new product was being tested in addition, and it was more like 430RWHP with the timing lowered just with swapping the blower.
Brian
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Joined: Jul 2001
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From: Florida
These are the best gains I've seen so far for a mildly modified L.
I see almost a full point change in A/F in the upper rpm range. Is this strictly due to the port job?
I really like how the torque curve flattened out.
I see almost a full point change in A/F in the upper rpm range. Is this strictly due to the port job?
I really like how the torque curve flattened out.
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Joined: Oct 2003
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the porting usually does lean it up a bit because it rasies boost. I don't think there's 20HP in the fact that it leaned up a half point, but anything is possible. The main point was just to show the customer's results with the same tune, same day, same temp, etc. This isn't the first one I've seen with this type of gain with a 4lb lower, but we will still continue to advertise conservative results 
Brian
Brian
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Joined: Oct 2002
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From: Central Joisey
I’m not trying to take anything away from these numbers because they look great. But there seem to be a lot of variables that keep coming out piece meal. Just as an example, the before pull after driving 5 ½ hours could have been done with a lot of heat soak in the engine. The from testing some stuff at JDM, I had noticed that any slight change in A/F ratio, Timing, or Intercooler temperature would severely skew our results on what we were doing. Again, I’m not trying to take anything away or say that anything was done wrong. It was just an observation. I have no doubt that this porting works and I’ll most likely be going in this direction.