Camaro LT5

[clill]

Apparently


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[Spiffav8]

Originally Posted by clill

Apparently


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Approved. This should be fun to watch.

[jeff71]

If that was an even trade for Apex I would say mark won that deal. Because nobody likes a white 69 Camaro except Charlie.......

[Ketzer]

Originally Posted by clill

Apparently


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This is very awesomesauce....

[JD67SS]

Originally Posted by Ketzer

This is very awesomesauce....

Awesome as it stands right now... please don’t paint it white

[thedugan]

Mark, a lot of people with supercharged motors run hydro boost setups or now the huge electric masters. You look to be using the DSE booster and master setup. How do you make that work with all of the track driving you do and having vacuum for the brakes? The reason I ask is I don't want to use a hydro boost or an electric master on my future procharger setup. Want to stick with my DSE setup.

[Stielow]

Originally Posted by thedugan

Mark, a lot of people with supercharged motors run hydro boost setups or now the huge electric masters. You look to be using the DSE booster and master setup. How do you make that work with all of the track driving you do and having vacuum for the brakes? The reason I ask is I don't want to use a hydro boost or an electric master on my future procharger setup. Want to stick with my DSE setup.

I have run normal brake boosters on all my projects. I have never had an issue, but I’m not a left foot braker. If you like to drive 2 footed, one foot on the gas and one foot on the brake pedal I could see a use case where you could deplete the vacuum in the booster.

I have driven turbo cars and have left foot braked. You can deplete the vacuum in the booster very easily.

I have never used or driven a vehicle with a ProCharger. My applications have been positive displacement blowers. When you drop throttle they immediately build vacuum. I also have not run wild camshafts that do build vacuum at idle.

Also it depends on if you are DI or PFI.

Sorry for the long reply. So the short answer is it depends on your set up.

On a side note I have driven hydraulic brake boosters on police cars on track. The brake feel was poor but that was 10 years ago.

Mark


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[srode1]

You brought up the PCV topic in the Hobbs camaro build but I didn't want to ask the question about your system on the LT5 there and corrupt that build conversation, so I'll ask it here. Other than the vent on your oil tank on that build, what did you do if anything to modify the stock PCV system on this engine? And for the oil tank, did you use the air inlet tube as a source of clean air for that side?

[Blown353]

Originally Posted by thedugan

Mark, a lot of people with supercharged motors run hydro boost setups or now the huge electric masters. You look to be using the DSE booster and master setup. How do you make that work with all of the track driving you do and having vacuum for the brakes? The reason I ask is I don't want to use a hydro boost or an electric master on my future procharger setup. Want to stick with my DSE setup.

While I'm not Mark, GM does use an auxiliary electric vacuum pump on the ATS-V to supplement vacuum for the brake booster when the engine is under boost... it works great. There's a vacuum sensor right at the inlet of the brake booster and the ECM will cycle the auxiliary electric pump as needed if the brake booster vacuum drops while the engine is under boost, something which can happen if you're a heavy left foot braker.

The factory electric vacuum pump on the ATS-V is made by Hella, and they're obviously OEM quality and reliable. Hella makes several vacuum pumps with different volumes and duty cycles; many hybrid cars use them as well as the sole source of brake booster vacuum when the car is running in straight EV mode.

The ones I've had very good luck with is Hella # 8TG-012-377-701, it's one of the heavier duty, higher volume, higher duty cycle pumps for hybrids and the like. The one GM used on the ATS-V is a much lower volume, lower duty cycle unit only meant to supplant engine vacuum very occasionally, and the OEM ECM has some logic to limit the vacuum pump duty cycle to prevent overheating it. I've used the larger, higher duty cycle 8TG-012-377-701 on both turbo cars and cars with big cams and poor idle vacuum and also on a couple of rock crawlers where guys didn't want to use a hydroboost but also where losing vacuum to their power brakes would be a real problem if the engine died while all crossed up on some rocks. They pull vacuum very quickly, are quiet while doing so, and are very reliable.

[thedugan]

Originally Posted by Blown353

While I'm not Mark, GM does use an auxiliary electric vacuum pump on the ATS-V to supplement vacuum for the brake booster when the engine is under boost... it works great. There's a vacuum sensor right at the inlet of the brake booster and the ECM will cycle the auxiliary electric pump as needed if the brake booster vacuum drops while the engine is under boost, something which can happen if you're a heavy left foot braker.

The factory electric vacuum pump on the ATS-V is made by Hella, and they're obviously OEM quality and reliable. Hella makes several vacuum pumps with different volumes and duty cycles; many hybrid cars use them as well as the sole source of brake booster vacuum when the car is running in straight EV mode.

The ones I've had very good luck with is Hella # 8TG-012-377-701, it's one of the heavier duty, higher volume, higher duty cycle pumps for hybrids and the like. The one GM used on the ATS-V is a much lower volume, lower duty cycle unit only meant to supplant engine vacuum very occasionally, and the OEM ECM has some logic to limit the vacuum pump duty cycle to prevent overheating it. I've used the larger, higher duty cycle 8TG-012-377-701 on both turbo cars and cars with big cams and poor idle vacuum and also on a couple of rock crawlers where guys didn't want to use a hydroboost but also where losing vacuum to their power brakes would be a real problem if the engine died while all crossed up on some rocks. They pull vacuum very quickly, are quiet while doing so, and are very reliable.

Great info. I don't want to hijack Mark's LT5 thread which I kinda did. It might be worth its own thread under brakes on how it works, wired, what to use, etc. Sounds like an excellent option for us boosted guys.