balancer installed, shift points raised
04-15-2019, 04:39 PM
#51
Senior Member
Thread Starter
well as I was reading earlier, the gen II motors have bigger valves and different intake ports than the gen I and flow better, so it would make sense that spinning a gen II motor in a higher rpm range would be beneficial. with the gen I heads and 410 gears, probably keeping the rpms lower and shifting sooner to keep it more where it's able to accelerate at a greater rate would work better. It sort of makes sense (at least to me) that spinning the gen I motor didn't gain the better elapsed times I was hoping for (in retrospect). if I can add power with a smaller pulley and still keep the shift points down some, I think I could still gain a couple tenths form the best so far of 11.98....I think...anyway i'm saying the powerband is lower on my motor than the gen II's. I was able to do better 60' times than Chad and Ecks (and they're both 4wd). IIRC our 1/8 mile times were identical, but Chad would pull away and run more mph and better et's on the back half
Last edited by rojizostang; 04-15-2019 at 04:45 PM.
04-15-2019, 05:01 PM
#53
Senior Member
That’s why I said to use you dyno chart to help guide you in shift point selection, that might mean pulley down/ rev higher and see what power does
04-15-2019, 05:10 PM
#54
Senior Member
Thread Starter
yes, 12:1 vs your 10.5:1
really it be come a head flow isssue, you will reach a point where power will fall if you try and stuff too much in.
call vmp and ask what the highest boost you can run is.
I won’t use them for tuning but they can tell you which one to get and sell it too you
ask about fuel also and get back on the dyno
really it be come a head flow isssue, you will reach a point where power will fall if you try and stuff too much in.
call vmp and ask what the highest boost you can run is.
I won’t use them for tuning but they can tell you which one to get and sell it too you
ask about fuel also and get back on the dyno
as far as the dyno is concerned, it apparently isn't 100% indicative of what's going on at the track. Yes, it's still making power at 6900 rpm, but my theory is that it's already passed its maximum acceleration zone (my terminology), even though the horsepower part of the graph is still climbing. but the dude at 5star agreed that it's not as effective to spin the gen I motor as high as the gen II. so for now i'll depend on the 410 gears and increased boost to accelerate more in the 1/8 mile and just kind of hold on in the back half...just my theory, no science to back anything up.
04-15-2019, 05:13 PM
#55
Senior Member
good idea. I couldn't get ahold of vmp, but I did 5star. he said 12-13lbs is still doable on the gen I motor, stock long block, on 93 octane
as far as the dyno is concerned, it apparently isn't 100% indicative of what's going on at the track. Yes, it's still making power at 6900 rpm, but my theory is that it's already passed its maximum acceleration zone (my terminology), even though the horsepower part of the graph is still climbing. but the dude at 5star agreed that it's not as effective to spin the gen I motor as high as the gen II. so for now i'll depend on the 410 gears and increased boost to accelerate more in the 1/8 mile and just kind of hold on in the back half...just my theory, no science to back anything up.
as far as the dyno is concerned, it apparently isn't 100% indicative of what's going on at the track. Yes, it's still making power at 6900 rpm, but my theory is that it's already passed its maximum acceleration zone (my terminology), even though the horsepower part of the graph is still climbing. but the dude at 5star agreed that it's not as effective to spin the gen I motor as high as the gen II. so for now i'll depend on the 410 gears and increased boost to accelerate more in the 1/8 mile and just kind of hold on in the back half...just my theory, no science to back anything up.
04-15-2019, 05:24 PM
#56
Senior Member
Thread Starter
well I can't argue with anyone about who to talk to, however I spoke to Chris at 5 star and he says I could swap to the 72mm pulley and still keep the 47lb injectors and the stock fuel pump. That's pretty good news.
We also spoke about the issue with the slower et's at the track with the higher shift points and he agreed that while the truck is still making power at 6900 rpms, it may not in its ideal zone for accelerating, so to speak. This is good news from pretty much every stand point. I feel like I can go to the 72mm pulley without doing anything accept a minor tweak on they dyno and a little datalogging.
sweet.
We also spoke about the issue with the slower et's at the track with the higher shift points and he agreed that while the truck is still making power at 6900 rpms, it may not in its ideal zone for accelerating, so to speak. This is good news from pretty much every stand point. I feel like I can go to the 72mm pulley without doing anything accept a minor tweak on they dyno and a little datalogging.
sweet.
04-15-2019, 05:41 PM
#57
Senior Member
well I can't argue with anyone about who to talk to, however I spoke to Chris at 5 star and he says I could swap to the 72mm pulley and still keep the 47lb injectors and the stock fuel pump. That's pretty good news.
We also spoke about the issue with the slower et's at the track with the higher shift points and he agreed that while the truck is still making power at 6900 rpms, it may not in its ideal zone for accelerating, so to speak. This is good news from pretty much every stand point. I feel like I can go to the 72mm pulley without doing anything accept a minor tweak on they dyno and a little datalogging.
sweet.
We also spoke about the issue with the slower et's at the track with the higher shift points and he agreed that while the truck is still making power at 6900 rpms, it may not in its ideal zone for accelerating, so to speak. This is good news from pretty much every stand point. I feel like I can go to the 72mm pulley without doing anything accept a minor tweak on they dyno and a little datalogging.
sweet.
04-15-2019, 05:54 PM
#58
Senior Member
Thread Starter
04-15-2019, 06:05 PM
#59
Senior Member
edit: I searched and see he is having engine problems
Last edited by TX-Ripper; 04-15-2019 at 06:12 PM.
04-15-2019, 06:13 PM
#60
Senior Member
Thread Starter