Well like the title says the American Ride went to the Dyno on Saturday and was Basically strapped to it all day. The truck made more dyno runs in one day then I thought possible. What our goal was to make the truck run better.
Mike from KEM sat in the passenger seat all day tweaking things. There was a lot of theorys test and tried.
Jonathan from Swamps brought along some cylinder pressure sensing equipment. This was very useful in knowing how far we could push timing and how it was effecting the engine.
This the first dyno run since everything has been changed to run the higher rpms. On the first fun of the day to establish the base run we found that the truck would make peak hp at around 3500 rpms and drop off dramatically by around 4100 rpms or so. The truck also made considerably lower peak hp then what it made at the last dyno.
After many changes the peak hp went up to about 3700 rpms and the hp curve was then flat out to 5000 rpms. I think if Mike would have turned the RPMS up it would have just continued flat. What we believe that we have found is we are at the limit of this head. It just doesn't have enough cfm to make more power. The only way to make more power is increase the the boost to shove more air through the same restriction. We keep pushing timing and would pick up some power. As timing increased our boost went up. We found that for about every 1 pound the boost went up the truck made like 8 more hp on average. What we ended with was the truck made less peak hp but overall made more power in the band where is is being pulled at.
On Monday Guy took the truck back the same dyno where it did the 690. The numbers at the testing dyno were lower then we would have like to see and thought maybe it was not right. The truck made less hp on this dyno as well. So Guy swapped turbos and put on a big Precision turbo. The truck did make some more hp over the borg turbo but still not 690.
In the end we are let down as the truck just seems to have a restriction in it. It is sure seems to be on the airflow side. With a hp curve that flat you can just see it hit a wall just can't go up any more.
As for results I would say that we all gained a lot of knowledge. We got lots of very cool videos. I hope Guy is going to get them posted tonight. Muj from KEM took some cool ones as well maybe he will post. As Mike tweaked things the truck just sounded better and better. Just seemed to smooth out. It is a long winter to find a way to get more air in this motor.
Mike from KEM sat in the passenger seat all day tweaking things. There was a lot of theorys test and tried.
Jonathan from Swamps brought along some cylinder pressure sensing equipment. This was very useful in knowing how far we could push timing and how it was effecting the engine.
This the first dyno run since everything has been changed to run the higher rpms. On the first fun of the day to establish the base run we found that the truck would make peak hp at around 3500 rpms and drop off dramatically by around 4100 rpms or so. The truck also made considerably lower peak hp then what it made at the last dyno.
After many changes the peak hp went up to about 3700 rpms and the hp curve was then flat out to 5000 rpms. I think if Mike would have turned the RPMS up it would have just continued flat. What we believe that we have found is we are at the limit of this head. It just doesn't have enough cfm to make more power. The only way to make more power is increase the the boost to shove more air through the same restriction. We keep pushing timing and would pick up some power. As timing increased our boost went up. We found that for about every 1 pound the boost went up the truck made like 8 more hp on average. What we ended with was the truck made less peak hp but overall made more power in the band where is is being pulled at.
On Monday Guy took the truck back the same dyno where it did the 690. The numbers at the testing dyno were lower then we would have like to see and thought maybe it was not right. The truck made less hp on this dyno as well. So Guy swapped turbos and put on a big Precision turbo. The truck did make some more hp over the borg turbo but still not 690.
In the end we are let down as the truck just seems to have a restriction in it. It is sure seems to be on the airflow side. With a hp curve that flat you can just see it hit a wall just can't go up any more.
As for results I would say that we all gained a lot of knowledge. We got lots of very cool videos. I hope Guy is going to get them posted tonight. Muj from KEM took some cool ones as well maybe he will post. As Mike tweaked things the truck just sounded better and better. Just seemed to smooth out. It is a long winter to find a way to get more air in this motor.