[Goertz]

Powerfab Autosports Houston finally got a chance to test our intake manifold out on one of their C7 Vette.

Stock, MSD, G1Pro Intake

Now before I go posting up
Stock intake manifold has a 8.5" long primary, MSD is roughly 7" primary, mine are 4.5" Primary.

The length of the primary shifts trq to either higher or lower rpm, shorter primary = higher rpm manifold (the other sheet metal intake out there has a much shorter runner so it would be shifted even higher that ours meaning even less mid/low end).

I designed my intake manifold for big boost engines, big cubic inch engines, big cam engines, big rpm engines (basically anything needing big flow), not necessarily a bone stock engine, smaller blower and low boost engine. So with that being said when it straps down on something willing to rev to 7500rpm (where I have mine built to shine) or bigger engine or bigger boost I guarantee the gains will be even more substantial.


With all that said here are the charts.

notice 4000-5400rpm we lose 10wtrq over stock intake manifold then we gain it all back and would continue to gain if the person was willing to rev the engine a little higher. This was stock cam 7 psi (3.6" pulley) procharger setup. The reasoning for why my intake is showing 9lbs of boost is the map sensor is shrouded on the stock and msd type intake manifolds. With all the runners in the plenum and air pickup closer to the middle of the plenum rather than the plenum side walls it creates a low pressure zone on the plenum side walls.

The test was done keeping af's all the same to a degree without tuning and timing the same. Note in the mid range where mine lost power it also ran quite a bit leaner here so had they bumped it back into range it should have picked up some of that lost power. Also note this the where the msd ran richer and the trq chart relates this with it being higher here...

As far as questions about heat soak there was none, the plenum is roughly 2" over the valley which allows nice airflow to keep it from heat soaking, yes the bottom 2" of the runners and the flange are warmer than your plastic manifolds will be however the air is moving near the speed of sound and the amount of heat transfer back into the air there is negligible. If it is really a huge concern we can have a phenolic heat spacer made however you'll likely see zero gains.


We are looking to strap it onto a much more willing motor very soon revving 7500-8000rpm (all motor car running mid 10's 131mph) then again later on a bigger cube engine and bigger boost engine.


Other things to take into account is the plastic manifolds aren't going to be so happy with big boost setups. The msd we had access on a Procharger vette at Boostworks was leaking boost anything over 17psi.... I don't know about you guys but I don't like having limits on my power.



Tomorrow I will have a proper msd/g1 overlay chart in mean time here was cell cam pic (pink is g1, yellow is msd) showing 10loss mid range and 10 gain right at the red line, unfortunately as these cars approach rev limiter the cars start pulling timing so it makes numbers on the big end all wonky, just wait to get it on a bigger rpm car that already is running a 10.45 @ 131mph all motor and we see the big rpm gains

[Goertz]

Intake manifold will next being going to allmotor car setup as so:

Cam heads converter exhaust msd e85
10.45 at 131