[Ian SS]

Originally Posted by PRAY

What I said above was focused at the A8 cars but in my mind applies more to the M6 cars. The fact that a huge tq loss is more felt in a straight drive that you have to manually select the gear for anytime you want to apply power. And one that doesn't have as many gears to chose from as the A8 nor the RPM recovery after shift that the A8 has. Then there is the fact that the MSD makes more power than my ported stuff no where, it just holds a lesser power number for longer. In side by side runs starting at 4,500 and higher the MSD car I have run against that makes identical HP has not out run me. If we are talking about driving around curves and not just a straight line then power under the curve and exit speed and pulling tq are very important. You are not spending all of your time over 5,500. In a drag race you are not launching these cars at 5,500+ either. IMHO the MSD is more detrimental to the M6 with it's gear splits than an A8 by far. But that is just me looking at numbers. I don't have a M6 so I can't speak from first hand experience. I see that you have an MSD on your car so I would like to hear where you launch the car at the strip, drive the car under normal conditions, and spend most of your rpm time on the track that has corners. I would also like to know where your rpm recovery falls with lets say a 6,500 rpm shift.

I am not trying to antagonize you in the least. I am just trying to find a good application for the stock MSD and I haven't been able to yet nor justify the price over the stock pieces from GM. I would really actually like the MSD to work. In ported form I may back to back one on my car at the track just to see what happens. I have already done my dyno home work. It could be interesting. So please don't take my above statements as a slight. I am just an analytical person that deals in numbers and data.

Thanks.

I don't have any data.

Like Fraxum I got the MSD really early on when it was the only option (also the reason I have the CAI CAI). I got a really good deal on it as well.

My car pulls strong up top but I did not notice any considerable loss of tq below the curve. In fact when I race people its my power under the curve that lets me pull away.

I launch the car at about 2500 RPM with my Mickey et s/s and ran a 7.9 with a 1.8 60ft on a lightly prepped surface in 1000 DA.

I have thought about switching over to your ported IM as mine is still sitting in the garage collecting dust and spiders but I just don't see where I could have lost almost 40 rwtq in some places.

[PRAY]

Two identically modded cars except the MSD vs. my ported stuff.

[PRAY]

Same car, same day 20 minutes apart. My ported IM/TB vs. my ported MSD IM/TB.

[PRAY]

Originally Posted by Ian SS

I don't have any data.

Like Fraxum I got the MSD really early on when it was the only option (also the reason I have the CAI CAI). I got a really good deal on it as well.

My car pulls strong up top but I did not notice any considerable loss of tq below the curve. In fact when I race people its my power under the curve that lets me pull away.

I launch the car at about 2500 RPM with my Mickey et s/s and ran a 7.9 with a 1.8 60ft on a lightly prepped surface in 1000 DA.

I have thought about switching over to your ported IM as mine is still sitting in the garage collecting dust and spiders but I just don't see where I could have lost almost 40 rwtq in some places.

The normal loss of tq is 25rwtq ish. On the cam car is was almost 50rwtq down low. I will get that graph. It was really bad on the cam car.

You are in it to win it now brother. I would just have your MSD ported at this point. The MSD needs the TB ported as well for velocity and overall air flow capability.

[Megahurtz]

The MSD is a monster on the LS7's. Not so much on stock heads/cam LT1's. PRAY is speaking truth.

[PRAY]

Originally Posted by Megahurtz

The MSD is a monster on the LS7's. Not so much on stock heads/cam LT1's. PRAY is speaking truth.

You just spoke truth. My last three LS7 H/C cars all put down over 630rw N/A with my ported MSD, ported factory heads, and my custom cam. It is a beast on the LS7.

[hamilton2008]

im runn a ported msd intake on my head cam car. went 10.86 at 126 on this set up on the 3rd pass. 1.48 60ft.. the car just wasnt making power past 6200 rpms but now make power up to 7500. Also was haveing issues with the converter unlocking in 3rd. the intake picked mine up 25 hp. we are aiming for sub 10.5.... results will be posted

[PRAY]

Originally Posted by hamilton2008

im runn a ported msd intake on my head cam car. went 10.86 at 126 on this set up on the 3rd pass. 1.48 60ft.. the car just wasnt making power past 6200 rpms but now make power up to 7500. Also was haveing issues with the converter unlocking in 3rd. the intake picked mine up 25 hp. we are aiming for sub 10.5.... results will be posted

That's awesome, glad you are getting it worked out. I am curious to see how fast you go. What was causing your power loss over 6,200? You are a 10th better on the 60ft than my stock converter times. I am hoping for 1.4x's with a stall.

What's the rest of the combo? I am guessing 1SS, 4K stall, drag pack etc. Race weight? How much tq did you lose going to the MSD down low on your combo? What was the DA of your first passes?

I would figure you would see more than 25rw with a ported MSD over stock on your combo. Sounds like a fairly large cam to spin to 7,500 in a 376. I am glad to see your short block is keeping up at those speeds. I gained 17/16rw with my ported stock IM/TB over stock and another 3-4rw peak with the ported MSD. You are just tapped out around 300cfm with the stocker no matter how you port it. A MSD will be a must at a certain point regardless of the tq loss down low. But I guess that is what they make big converters for.

Can you post up your stock IM to the MSD dyno graphs. I am really curious to see what kind of power past peak and where you peaked with both manifolds is. That will tell the story.

Keep at it man and report back. I am very interested.

[RideZX6R]

After seeing what I've on dynos and such... Even with the head/cam setup I plan to run, I'll probably do everything as far as mods before I drop cash to get the MSD IM and port it. Likely will use ported stock one and ported stock TB for a while.
The car will be mainly road course use (and a 6MT), so I was as much under the curve as possible and to keep my tq in the mid-range as long as I can.

What will be interesting to see will be any interesting results of the air velocity the heads/cam package will create... I'll be running an experimental setup with a GEN5 5.3L head that will be ported and have valves. SPS Cylinder heads will be doing the work and using my heads as the guinea pig to get the right mix of velocity and flow so I can make good peak power but have a nice fat powerband.