FIXED 469hp/600tq: (boost leak)YSi numbers low on Stock L99 with Holley Mid-Ram

[RaiderSS]

Originally Posted by grocerygetter

Just curious...why did you buy a ysi kit vs a 1500? Ecs stock 1500 kit should make 10 psi on your combo. Or close.

Had the ECS-YSi kit for a bigger LS block I'm building but it will be a while before I can finish it.... In the meantime wanted to grow this setup to +650 for another year or two then put The the L99/6L80 drive train in a 70 Camaro which will also be a while to finish....

[stevieturbo]

Originally Posted by RaiderSS

Tuner and I both agree the MAF seemed restricted and he saw the logs were it was spiking erratically... I thought because of ducting but he said it was more than that but I don't see how unless something small went bad during install.

MAF's are very particular about smooth airflow, post a picture of the setup.

And anyone who says a YSI cant work at low boost is full of shit. Yes there may be better options out there if it's a dedicated low boost setup, but the YSi will still work superbly.

I first used my YSi on a totally standard ( aside from headers ) 5.7 LS1 10 years ago.
This was with 8.25" crank and 4" blower pulley. And it was superb everywhere ! and made about 10psi at 6000rpm on that build.

But as per other thread, if the MAF was showing spikes and erratic behaviour, it should be blatantly obvious it is not happy with how airflow is passing through it. If the tuner doesnt understand that, that alone should raise concerns

Find a new tuner who can either tune correctly, or diagnose correctly.

[Pro Stock John]

IMO if you are buying parts with an eye to a big build in the future, I would just fix the tune and be satisfied with soft results.

Blowers shift up the power band but you are running lifters and valve springs that won't support that.

[RaiderSS]

Originally Posted by Pro Stock John

IMO if you are buying parts with an eye to a big build in the future, I would just fix the tune and be satisfied with soft results.

Blowers shift up the power band but you are running lifters and valve springs that won't support that.

Thats almost where I am now except I would like to spin it up a but more and maybe try a waste gate...

[grocerygetter]

Originally Posted by RaiderSS

Thats almost where I am now except I would like to spin it up a but more and maybe try a waste gate...

If you want to raise the rpm limiter or target upper 500whp or higher (ysi=both of those)..I would change lifters.

[RaiderSS]

Originally Posted by grocerygetter

If you want to raise the rpm limiter or target upper 500whp or higher (ysi=both of those)..I would change lifters.

The limiter is lowered because of stock lifters. They are being replaced as soon as engine builder can get me in....probably late spring

[RaiderSS]

Made a pressure tester and found some leaks....
At the bottom of the red silicone reducer was a huge boost leak at the charge tubbe
At the pcv spout on drivers side crank case with a real fine vac leak at the break booster T

[RaiderSS]

After fixing those the pressure held up to 30psi when I plugged the crank case vent tube that's feeds back into ecs filter....

When unplugged it slowly bled off air, that should be the case correct?

[RaiderSS]

So if that was my Issue the boost will be higher than what it was tuned for... will call tuner to see if that safe. I've got dual aeroforce gauges in route to read boost on the way but will have to wait to start car.

[stevieturbo]

I'd highly doubt the leaks are the problem.

New tuner.

[RaiderSS]

The leak was a huge gap between silicone reducer and charge tube after the MAF before the throttle body.... I'm sure it was a big part of the problem causing no port velocity. Blower was moving air but the gap prevented this big ass manifold from pressurizing. Also found a substantial vac leak.

I have seen cars from this tuner set records at wanna go fast he knows what he is doing but if fixing these issue still doesn't get car to 500hp minimum with the current 3.47 pulley, I will have another tuner look at his work....

[stevieturbo]

Originally Posted by RaiderSS

The leak was a huge gap between silicone reducer and charge tube after the MAF before the throttle body.... I'm sure it was a big part of the problem causing no port velocity. Blower was moving air but the gap prevented this big ass manifold from pressurizing. Also found a substantial vac leak.

I have seen cars from this tuner set records at wanna go fast he knows what he is doing but if fixing these issue still doesn't get car to 500hp minimum with the current 3.47 pulley, I will have another tuner look at his work....

If there is a leak around the MAF, then that will screw things up.

But then that goes back to what I said about the erratic MAF readings. When the tuner seen this why were they not investigated ?

As for causing no port velocity...LOL

Air leaks are never good, small leaks on the pressure side, not a major issue.

Air leaks after a MAF, always an issue, but then you said the tune went MAFLess in which case the leak would have less of an impact.

Either way, it sounds like shoddy work.

[RaiderSS]

After fixing all the air leaks car has a lot more power and low end torque back. Trying to get tune adjusted Friday or Saturday I think I found the source of the super low numbers....

Thanks to those who actually suggested troubleshooting techniques.....

[Rdunn]

I run a F1X on my stock l99. No problems at 16psi and 800+whp