Back to the track 2020!

[Tajefe Couple]

Originally Posted by Chris49066SS

Excellent 60', well done!

My race weight today was 3775 with the 210 lb driver.

Thanks!

Think I figured out my big end problem. Checked logs and car is shifting into 5th before the trap. Maybe need to look at a new intake to be able to turn higher than 6800 rpm before power starts dropping off. Going to send logs to Ryan and see what he thinks. End of season and might take it down to them this winter and get some work done anyway. Maybe go 417 stroker, will see.

Curious if you are liking your LOD?

Again sir!

[Chris49066SS]

Originally Posted by Tajefe Couple

Thanks!

Think I figured out my big end problem. Checked logs and car is shifting into 5th before the trap. Maybe need to look at a new intake to be able to turn higher than 6800 rpm before power starts dropping off. Going to send logs to Ryan and see what he thinks. End of season and might take it down to them this winter and get some work done anyway. Maybe go 417 stroker, will see.

Curious if you are liking your LOD?

Again sir!

Oh yeah, going into 5th is not ideal at all. I am in 4th and right at 7000 RPM going through the traps. The shift is at 7400. They all are except for the 1-2 shift at 7600. Ben Weishar did my tune last time.

I am liking the LOD, its going to shine in the future when the Procharger goes in.

[acammer]

Originally Posted by Chris49066SS

I spun on my 3rd and final run, so here is the best I could do. I popped one of my brand new ET Street Rs yesterday, so I feel that if I had those today, I would've been able to get into the 10s if I had hooked on that launch where I spun.

Man - definitely moving good. That's awful about the new tires, but at least it didn't seem to hurt the 60' much. Congrats on a new PB. That car has great MPH through the 1/8th, I'm surprised it doesn't run out the back harder. I bet with the LOD it would take more gear (or less) tire pretty receptively. More converter too. But, with your plan to go boost down the road, you're probably right where you wanna be with both of those.

[acammer]

Originally Posted by Tajefe Couple

Thanks!

Think I figured out my big end problem. Checked logs and car is shifting into 5th before the trap. Maybe need to look at a new intake to be able to turn higher than 6800 rpm before power starts dropping off. Going to send logs to Ryan and see what he thinks. End of season and might take it down to them this winter and get some work done anyway. Maybe go 417 stroker, will see.

Curious if you are liking your LOD?

Again sir!

Shifting into 5th definitely will kill MPH. Maybe set that shift point out a little further just for the 4-5 and hold it in 4th. Which cam is in the car? I know auto's don't typically need to be pulled as far past peak HP, but in 4th you may need to. Is it a lockup converter?

[Chris49066SS]

Originally Posted by acammer

Man - definitely moving good. That's awful about the new tires, but at least it didn't seem to hurt the 60' much. Congrats on a new PB. That car has great MPH through the 1/8th, I'm surprised it doesn't run out the back harder. I bet with the LOD it would take more gear (or less) tire pretty receptively. More converter too. But, with your plan to go boost down the road, you're probably right where you wanna be with both of those.

Thanks! When I do a TH400 swap I will likely be getting a 6k converter. May leave the 3.91 alone just need a better rearend for the launching I am planning

[Tajefe Couple]

Originally Posted by acammer

Shifting into 5th definitely will kill MPH. Maybe set that shift point out a little further just for the 4-5 and hold it in 4th. Which cam is in the car? I know auto's don't typically need to be pulled as far past peak HP, but in 4th you may need to. Is it a lockup converter?

Yeah shifting to 5th gear with a ratio of .85 not ideal. Wish I would have caught that earlier in the season hitting 5th at about 106-107mph not cool. Totally explains the consistent 118 mph trap speed though. Can't complain about my 60' being in the mid 1.5 range so thinking about leaving 1-2 alone but carrying 2-3, and 3-4th gear shifts out a couple hundred more rpm's. Have tap shifted it as high as 7200-7300 rpm so know the car will hold it no problem. Power just starts falling off around 6800. But probably wouldn't hurt as bad as hitting 5th gear that early. Just need a different intake than the rod mod I think. Guess might find out next season if I keep the same setup.
Stall is a Circle D 5C 4K stall with a GPI SS4 no flycut cam.

[acammer]

Originally Posted by Tajefe Couple

Yeah shifting to 5th gear with a ratio of .85 not ideal. Wish I would have caught that earlier in the season hitting 5th at about 106-107mph not cool. Totally explains the consistent 118 mph trap speed though. Can't complain about my 60' being in the mid 1.5 range so thinking about leaving 1-2 alone but carrying 2-3, and 3-4th gear shifts out a couple hundred more rpm's. Have tap shifted it as high as 7200-7300 rpm so know the car will hold it no problem. Power just starts falling off around 6800. But probably wouldn't hurt as bad as hitting 5th gear that early. Just need a different intake than the rod mod I think. Guess might find out next season if I keep the same setup.
Stall is a Circle D 5C 4K stall with a GPI SS4 no flycut cam.

There is no way that's shifting into 5th with a 28.5" tire and 3.91 gears. With a locked converter that car would only be turning 6200rpm in 4th at 118mph. I think that it's more likely you're feeling the car lock the converter in 3rd, and thinking that's the 3-4 shift, and then the car makes the 3-4 shift a little after that and you think it's a 4-5 shift. 4th gear in a 6L80 with a locked converter, 28.5" (325/45/17) tire, and 3.91's would go 128mph in 4th. Even with the converter unlocked and 10% slippage (it wouldn't be that much at that RPM) it would go 115 in 4th at 6800. Something seems off, or maybe I missed a detail about your setup somewhere. Even with 4.10s it should have enough gear to finish in 4th assuming you have a lockup (with I thought most 6L80 converters were).

As far as the power, it may peak at 6500 or so and start to roll over, but the stock manifold will carry on fairly strong a few hundred RPM beyond that, and a rod mod will extend that a little further. Auto guys don't need to do this as much cause ya'll have torque converters that help out, but stick cars usually need to be pulled significantly past the peak to make their best passes. We need the highest average HP we can get throughout the duration of the gear, if we shifted at peak power we would be selling ourselves short. A rod-mod, IMO, is a pretty good mod for the money, both for the extra peak power, but extending the usable top end a little further.

[Tajefe Couple]

Originally Posted by acammer

There is no way that's shifting into 5th with a 28.5" tire and 3.91 gears. With a locked converter that car would only be turning 6200rpm in 4th at 118mph. I think that it's more likely you're feeling the car lock the converter in 3rd, and thinking that's the 3-4 shift, and then the car makes the 3-4 shift a little after that and you think it's a 4-5 shift. 4th gear in a 6L80 with a locked converter, 28.5" (325/45/17) tire, and 3.91's would go 128mph in 4th. Even with the converter unlocked and 10% slippage (it wouldn't be that much at that RPM) it would go 115 in 4th at 6800. Something seems off, or maybe I missed a detail about your setup somewhere. Even with 4.10s it should have enough gear to finish in 4th assuming you have a lockup (with I thought most 6L80 converters were).

As far as the power, it may peak at 6500 or so and start to roll over, but the stock manifold will carry on fairly strong a few hundred RPM beyond that, and a rod mod will extend that a little further. Auto guys don't need to do this as much cause ya'll have torque converters that help out, but stick cars usually need to be pulled significantly past the peak to make their best passes. We need the highest average HP we can get throughout the duration of the gear, if we shifted at peak power we would be selling ourselves short. A rod-mod, IMO, is a pretty good mod for the money, both for the extra peak power, but extending the usable top end a little further.

My data from HP Tuners says the car is in 5th at 106-107mph, BTW my tires are 28". The dyno pull also shows the power flattening out around 6500 and dropping off around 6800 give or take so your about right on there. Nothing personal but it is whats happening in the real world with my car. I know what should be going on, hence the need for a change and wanting GPI to look at it and give an opinion. Have always suspected a transmission issue though. Guess I'll find out eventually.
As far as the rod mod it is a good intake but want something to carry the power out a bit more.
Snapshot of the log at 110mph right after shifting into 5th. You can see I haven't lifted yet since I'm not through the traps. Hope this helps grasp what I'm dealing with.

[acammer]

Originally Posted by Tajefe Couple

My data from HP Tuners says the car is in 5th at 106-107mph, BTW my tires are 28". The dyno pull also shows the power flattening out around 6500 and dropping off around 6800 give or take so your about right on there. Nothing personal but it is whats happening in the real world with my car. I know what should be going on, hence the need for a change and wanting GPI to look at it and give an opinion. Have always suspected a transmission issue though. Guess I'll find out eventually.
As far as the rod mod it is a good intake but want something to carry the power out a bit more.
Snapshot of the log at 110mph right after shifting into 5th. You can see I haven't lifted yet since I'm not through the traps. Hope this helps grasp what I'm dealing with.

Very odd. I sent you a pm, I'd love to look at a log, something is odd.

[Tajefe Couple]

Originally Posted by acammer

Very odd. I sent you a pm, I'd love to look at a log, something is odd.

Appreciate it sent you a couple logs, just let me know what you think.

[Chris49066SS]

Thats weird. In this video, you can hear me going through the gears. The 1-2 shift happens real quick, then you'll hear the 2-3, then you can hear the rpms drop while the converter is locking up, then you'll hear the 3-4 shift. Then I was at about 6800 on that pass at 119mph.



So yeah I couldn't imagine going into 5th with mine. Wonder whats goin on there with yours.

Shouldn't be much behind me if you get it resolved. We have a similar build, I have the SS4 flycut cam

[Tajefe Couple]

Originally Posted by Chris49066SS

Thats weird. In this video, you can hear me going through the gears. The 1-2 shift happens real quick, then you'll hear the 2-3, then you can hear the rpms drop while the converter is locking up, then you'll hear the 3-4 shift. Then I was at about 6800 on that pass at 119mph.



So yeah I couldn't imagine going into 5th with mine. Wonder whats goin on there with yours.

Shouldn't be much behind me if you get it resolved. We have a similar build, I have the SS4 flycut cam

Yeah can really hear yours shift sounds good!
I was hoping to get closer to the times you run since are builds are so close. I'm not unhappy with the car but I've mentioned to Ryan the car feels like it's leaving a lot on the table. Just need to get with him again.
When Andrew brought it up I did take a little closer look at a couple logs and every gear change is happening way earlier than I want. 1-2nd is right at 6K so it amazes me the car 60's as well as it does. Probably next year before I can get back out, local tracks closed and winter seems to be here to stay already. Hope to have it down to Arkansas before spring though.

[Chris49066SS]

Thanks! Well, Ben did my tune last time, so he could offer some insight on the shift points when you go there. Mine drops to 6.2k on the shifts. Did you say you did your trunnions? Yours has an even better 60' than mine, so I wonder if thats the issue, with the shift points.

[acammer]

I sent Tajefe some thoughts. Doesn't seem to have a lockup, and that's why it's going for the 4-5 shift. It looks like it's spinning in 1st a little, so it bangs the 1-2 a little early as well, and makes the rest of the shift around 6800. The air looks crappy too. It'll go faster - more rpm out the back to keep it in 4th, taller tire, or a lockup.