BUILD THREAD 86 GP 2+2~Blown 6.0

[Supercharged111]

What kind of clutch master/slave are you running again? The stock stuff uses orifices and causes shifting issues when you rip on the car.

 

[81cutlass]

What kind of clutch master/slave are you running again? The stock stuff uses orifices and causes shifting issues when you rip on the car.

Master is a 3rd gen camaro T5
Slave is a howe T5 hydro TOB conversion part




So I did some digging and this is the dyno chart of a 6.2 with a maggie and 6psi on 91 with the same BTR stage 2 blower cam.

I can see how Carl the tuner (who has built and tuned dozens of LSA cars) was saying this cam should make peak power at 6600 and to not be a panzy and spin the thing. I am probably giving up 20+hp at the top of the RPM range and at least 30 at the bottom.

I need to stop being a dummy and fix my fuel lol.

 

[Supercharged111]

Master is a 3rd gen camaro T5
Slave is a howe T5 hydro TOB conversion part




So I did some digging and this is the dyno chart of a 6.2 with a maggie and 6psi on 91 with the same BTR stage 2 blower cam.

I can see how Carl the tuner (who has built and tuned dozens of LSA cars) was saying this cam should make peak power at 6600 and to not be a panzy and spin the thing. I am probably giving up 20+hp at the top of the RPM range and at least 30 at the bottom.

I need to stop being a dummy and fix my fuel lol.

Did the 3rd gen use an orifice like the 4th gen in the line? I could see such a thing causing a pressure spike when you pound on the pedal for a man shift. And is this car running a T5?! If so I'd be far less scared of the diff esploding than your 3rd gear. Pardon my ignorance, I thought you had a T56. I put a Tick/Tilton master in my Z06 and it was a game changer for sure.

 

[64nailhead]

So I did some digging and this is the dyno chart of a 6.2 with a maggie and 6psi on 91 with the same BTR stage 2 blower cam.

I can see how Carl the tuner (who has built and tuned dozens of LSA cars) was saying this cam should make peak power at 6600 and to not be a panzy and spin the thing. I am probably giving up 20+hp at the top of the RPM range and at least 30 at the bottom.

I need to stop being a dummy and fix my fuel lol.

I don't know if I would put it quite that way lol.

You're 60's are great afaic for a stick car that is completely streetable. It took me a bit to get consistently below 1.7 with an auto. I think holding the rpms below 6200 is hurting. Let it run to high 6's should help. How much rpm's drop are you seeing in every gear? Are you able to keep it 4800-5000 on the shifts? I know I've asked this before, but I've forgotten.

 

[motorheadmike]

I can see how Carl the tuner (who has built and tuned dozens of LSA cars) was saying this cam should make peak power at 6600 and to not be a panzy and spin the thing. I am probably giving up 20+hp at the top of the RPM range and at least 30 at the bottom.

I need to stop being a dummy and fix my fuel lol.

Notice the EQ ratio curve is the inverse of the torque curve?

You will need slightly different fuel and spark values between MBT and peak power.

 

[81cutlass]

Did the 3rd gen use an orifice like the 4th gen in the line? I could see such a thing causing a pressure spike when you pound on the pedal for a man shift. And is this car running a T5?! If so I'd be far less scared of the diff esploding than your 3rd gear. Pardon my ignorance, I thought you had a T56. I put a Tick/Tilton master in my Z06 and it was a game changer for sure.

I don't know if the 3rd gen used an orifice. Either way, I am using braided -4 hose from my master to the slave cylinder and the only OE part is the master so I don't think that is an issue.

I might be causing some type of a spike, but something for sure changed between Friday and Sunday. Just looking at my logs the clutch pressure peak has increased and the feel is a lot different. I might be at the end of the stroke of my slave cylinder. I need to check.

I do have a t56. It's an LT style so it had the goofy pull clutch. I threw the pull clutch away and put the Howe t5 hydro TOB conversion part in and made a small bushing to close a small gap in between ID of the TOB and the OD of the shaft that covers the input shaft. The Howe TOB has 0.536" of travel. I never checked the relaxed length of the master when I put the new clutch in. I got in a rush and thought It should be fine, LS clutch for LS clutch, no problem. The pressure curve looks like the slave is reaching travel limit.

I might look at a Tilton style master this winter. The stock 3rd gen master is 3/4. I might need a size up.

I don't know if I would put it quite that way lol.

You're 60's are great afaic for a stick car that is completely streetable. It took me a bit to get consistently below 1.7 with an auto. I think holding the rpms below 6200 is hurting. Let it run to high 6's should help. How much rpm's drop are you seeing in every gear? Are you able to keep it 4800-5000 on the shifts? I know I've asked this before, but I've forgotten.

If I shift at 6250 it drops to 4400. So yeah, if I shift at 6750 it should drop to about 4900. It looks like there is about 50hp difference down there. Ive honestly never looked at shift points much so this is a discussion I need to have.

I agree. 1.7 60's are OK. I am happy with that! I can sit there for the forseeable future and have no complaints. What I seem to be loosing out on is that 60-150 ft range. My 330 ft time is a lot down compared to similar builds with less power (and less weight). I attribute that to the RPM being so low in that 60-150ft range because the clutch is fully coupling below 3500ish RPM.

Notice the EQ ratio curve is the inverse of the torque curve?

You will need slightly different fuel and spark values between MBT and peak power.

Mind sharing some info on EQ ratio past MBT? I know timing is supposed to go up, but I have no idea what my EQ should be doing. I know 10.8 is bad, but should it actually be leaning up? 12 or more?

Mr. Pro Tuner said with the level of boost I am on leaner than 11.5 is OK. He suggested 11.5 is what he targets for an LSA setup but I am just not making the boost the LSA stuff does.

For some reason this M122 doesn't have the pop the LSA blowers have. I assume because LSA people seem to get high teens boost but I am tapped out at 11.5. The GT500 is a Gen V rotor and the LSA is a TVS Gen VI rotor from what I understand and there is a big improvement from the gen V to gen VI rotor pack.

 

[Supercharged111]

The way that motor keeps hanging on, I wouldn't shift before 7000. The single cone syncros may not be all that thrilled.

 

[81cutlass]

One of the other DW'ers posted a video of his run. I am in the other lane. You may or may not be able to open it.

This is only the second pass I made and WAY before my slipper valve was dialed in. 1.8 60 ft and a 12.0 pass. 3600 on the 2 step and hard bog to 1500RPM with trash AFR

The car damn near pulls the front tire off the ground. I am 90% sure if did pull the front wheel off the ground on other passes considering this launch was probably one of my worst and I went from a 1.8 to a 1.62.

I also need to get some tighter front shocks because the front end comes up right away before the car even starts moving. I need to tighten it up a lot.

https://www.facebook.com/video.php?v=2916084405280123

 

[81cutlass]

Had some errands to run CONVENIENTLY in the town where my favorite salvage yard is (how odd!, lol), so I stopped at the salvage yard. Funny how those things work! I only have a few days left of 'Jake is selectively unemployed for a month between his Master's schooling and starting work again' time off so I wanted to get in a run before winter.

Grabbed a good drivers door mirror since the one on the car is all floppy, I'll save and swap when the car is painted. Some seat belt bolt trim covers, a trim piece for the Rainier I broke, and a Saturn Vue compass/thermostat rear view mirror that I plan to swap this fall or spring.

Did a thorough view of all 73/4 Omegas to see if I can find enough good parts to piece the lightly wrecked one I found out in SD last month.

 

[Texas82GP]

Had some errands to run CONVENIENTLY in the town where my favorite salvage yard is (how odd!, lol), so I stopped at the salvage yard. Funny how those things work! I only have a few days left of 'Jake is selectively unemployed for a month between his Master's schooling and starting work again' time off so I wanted to get in a run before winter.

Grabbed a good drivers door mirror since the one on the car is all floppy, I'll save and swap when the car is painted. Some seat belt bolt trim covers, a trim piece for the Rainier I broke, and a Saturn Vue compass/thermostat rear view mirror that I plan to swap this fall or spring.

Did a thorough view of all 73/4 Omegas to see if I can find enough good parts to piece the lightly wrecked one I found out in SD last month.

We don't have yards like that here.