Brakes not working after sitting over a year.......

[Chevy Fanatic]

Propane is VERY effective at finding vacuum leaks. I would not waste any time on this issue until you put a tune in it. You made quite a few changes in the engine and should not expect it to run properly until tuned. No difference when you swap out a stock cam, car is not going to idle, stall, and all sorts of problems until you upload a tune. I understand your car has a tune in it but that was based off of the previous engine configuration. You changed compression, lift, duration do you really expect it to run properly without making changes in the tune file?

[JusticePete]

The tuner must have a sound engine to tune so Randy should check for leaks first.

[PQ]

Originally Posted by Chevy Fanatic

Propane is VERY effective at finding vacuum leaks. I would not waste any time on this issue until you put a tune in it. You made quite a few changes in the engine and should not expect it to run properly until tuned. No difference when you swap out a stock cam, car is not going to idle, stall, and all sorts of problems until you upload a tune. I understand your car has a tune in it but that was based off of the previous engine configuration. You changed compression, lift, duration do you really expect it to run properly without making changes in the tune file?

Understood. I don't plan on driving the car till I get it tuned.

But Pete is right about making sure it's sound. I'd be shocked to find out that a tune could cause brake issues........ right? lol

Originally Posted by JusticePete

The tuner must have a sound engine to tune so Randy should check for leaks first.

You are quite correct. If fact the guy tuning my car says he doesn't fix cars on the dyno. He tunes them. lol

Fixing is another time.

[Chevy Fanatic]

Originally Posted by PQ

But Pete is right about making sure it's sound. I'd be shocked to find out that a tune could cause brake issues........ right? lol

A small vacuum leak is not going to cause overall low vacuum at the booster. A tune will. Go find a small block chevy with a distributor, retard the timing and see what happens to the vacuum.

[PQ]

Originally Posted by Chevy Fanatic

A small vacuum leak is not going to cause overall low vacuum at the booster. A tune will. Go find a small block chevy with a distributor, retard the timing and see what happens to the vacuum.

hopefully all will be fine once I get it to the tuner.

[Redemption]

What's the word?

[PQ]

Originally Posted by Redemption

What's the word?

The tuners I've talked to just can't get to it right now. So the car is sitting again.

[JusticePete]

I know a guy....

[PQ]

I know you do. haha

[BenningJ]

Originally Posted by PQ

Bypass is opening fully and no leaks on the hose.

Could be this cam with a stock TC and the 1800 stall?

Those pulleys are a bitch while installed. I do have a small serpentine I can possible put on bypassing the front drive pulley of the blower.

Vengeance tuned it last time. They absolutely over looked this issue somehow.

Yup. It really is down to vacuum.

So tune, leak, cam caused, or overdrive pulley caused.

haha, I did propane torch. Seen it work before but not sure how effective.

I do not have my catch can installed yet and my Maggie did not come with one.

I'll try the carb cleaner instead of the propane.

That cam on a naturally aspirated car would require at least a 3200 stall. Not sure if having boost changes that but I could easily see you overpowering the brakes with the stock converter.

[PQ]

Originally Posted by BenningJ

That cam on a naturally aspirated car would require at least a 3200 stall. Not sure if having boost changes that but I could easily see you overpowering the brakes with the stock converter.

Brakes should still hold in reverse but just be hard. Still doesn't explain the low vacuum.

I'm guessing a little of both. It drives fine the way it us untuned. Tuning this week so we'll see. Either way I will have to get a stall. Tuner will tune for the stall at next to nothing once I get it.