#8 or #10
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Senior Member
Joined: Dec 2001
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From: down south
with the eaton ,how much boost is safe on a stock motor with a well tuned chip and everything correct. i have a #2 upper and a #8 lower on my 99 and had a #2 and #6 for a long time before that with no detonation or problems ever.
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Joined: May 2000
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From: SoCal
Re: Buick V6
Originally posted by SVTED
A good friend of mine has a 1986 Buick T Type Turbo, pushes 21 LB of boost. 80,000 mi stock block. Are you people saying a 1986 V6 Buick has a stronger bottom end then our Lightnings? Ed
A good friend of mine has a 1986 Buick T Type Turbo, pushes 21 LB of boost. 80,000 mi stock block. Are you people saying a 1986 V6 Buick has a stronger bottom end then our Lightnings? Ed
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Joined: Jan 2001
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From: La Habra, CA
It would be interesting to see where that compressor map ends up at 15 lbs of boost, and 20,000+ RPM. On a logrithmic scale, I'm guessing somewhere north of 400 degrees. Can you say detonation!
The stock blower rpm on our trucks is just under 14,000 RPM at 5,200 RPM. That puts the Delta T ar about 250 degrees at the stock redline and boost.
On top of that, the cams and cyl. heads cannot keep up. You are going to need some serious work at 14-15 lbs and up to make significant further gains.
Like Tim said, you should be looking into other mods than more boost. Boost is just pressure with nowhere to go.
Case in point. My son has a blown, 383 powered Chevelle. We built the motor using Dart Sportsman heads. The thing lost 3 lbs of boost, and gained about 55 hp. That's because the air flow increased. No longer was it backing up into the manifold creating boost. We pullied it back to 7 lbs of boost, but it still didn't make the Hp we had hoped for (360). I did make over 510 lbs of torque. Looks under cammed to me, even though we had a "blower cam".
We changed the cam to a non-blower, solid lifter type. It had fairly tight centerline, and tons of duration, too. Lost 2 more lbs of boost, but ended up with over 400 Hp. We keep losing boost, but make more HP in the process. That's because the pressure is turned into airflow, allowing more volume of fuel and air.
We changed the cam to a non-blower type, with tight centerlines, and lots of duration.
The stock blower rpm on our trucks is just under 14,000 RPM at 5,200 RPM. That puts the Delta T ar about 250 degrees at the stock redline and boost.
On top of that, the cams and cyl. heads cannot keep up. You are going to need some serious work at 14-15 lbs and up to make significant further gains.
Like Tim said, you should be looking into other mods than more boost. Boost is just pressure with nowhere to go.
Case in point. My son has a blown, 383 powered Chevelle. We built the motor using Dart Sportsman heads. The thing lost 3 lbs of boost, and gained about 55 hp. That's because the air flow increased. No longer was it backing up into the manifold creating boost. We pullied it back to 7 lbs of boost, but it still didn't make the Hp we had hoped for (360). I did make over 510 lbs of torque. Looks under cammed to me, even though we had a "blower cam".
We changed the cam to a non-blower, solid lifter type. It had fairly tight centerline, and tons of duration, too. Lost 2 more lbs of boost, but ended up with over 400 Hp. We keep losing boost, but make more HP in the process. That's because the pressure is turned into airflow, allowing more volume of fuel and air.
We changed the cam to a non-blower type, with tight centerlines, and lots of duration.
