Intake manifold questions

[Chris49066SS]

+1 for rod mod and ported TB on a ~6700 range combo. SS3 and up you may leave a few hp on the table but take into account torque under the curve, future plans if you eventually want to boost, and get the right converter and gears. So many variables that factor into a decent combo or a great one. Acammer can set you straight on a combo of parts.

[acammer]

When we did our intake test with a stock compression ported head SS4 cam LS3, we observed an average gain of 1whp and 1wtq with a LSXR/102 vs. ported rod mod/stock 90mm throttle body. $1,300 for 1whp is insane, the LS3 intake is just really good, and there isn't much the LSXR can do to improve upon that.

Like these guys said, if you want to spend $1,300 - a converter would wake things up from a dig!

[morepowerjoe]

Originally Posted by acammer

When we did our intake test with a stock compression ported head SS4 cam LS3, we observed an average gain of 1whp and 1wtq with a LSXR/102 vs. ported rod mod/stock 90mm throttle body. $1,300 for 1whp is insane, the LS3 intake is just really good, and there isn't much the LSXR can do to improve upon that.

Like these guys said, if you want to spend $1,300 - a converter would wake things up from a dig!

But did it rev any higher?

[acammer]

Originally Posted by morepowerjoe

But did it rev any higher?

No, with a long runner it's basically on the same curve. As you can see, the peak is 8hp better, but the average from 5000rpm to 7000rpm (a fairly standard operating range for a street driven hydraulic roller setup) is 1hp, and 1tq - essentially nothing. It's a little better at 6500rpm, and a little worse at 5000rpm, but does not run out the top any better than the stock manifold.


https://gwatneyperformance.com//wp-c...102mm-dyno.png

With mid length runners, it would shift the peak up a few hundred RPM, and definitely give up on the lower RPM side of the curve, but carry the top better. Most of your run of the mill street builds are not setup to take advantage of where that operating range would be.

[morepowerjoe]

Thanks a lot for the clarification. You definitely know your stuff. Thanks again.

[morepowerjoe]

So Andrew another question. So with my SS1 cam will it rev any higher (like to 6700 rpm) with the ported rod mod or do I just need a SS3?

[acammer]

Originally Posted by morepowerjoe

So Andrew another question. So with my SS1 cam will it rev any higher (like to 6700 rpm) with the ported rod mod or do I just need a SS3?

The ported rod mod doesn't really shift the power band around much, it just adds peak power, and brings the mid-range in sooner. It does not typically impact shift points. The SS1 VVT is probably making peak power at like 6100 and pulling pretty good to 6700, and I wouldn't expect that to change, it'll just make more power through that range.

The SS3 VVT with a 3600rpm stall would be a really fun next step for your car when you're ready. The SS3 VVT is, in my opinion, one of the best camshafts we offer for guys looking for really good power, while still having great driveability. Keeping the VVT helps us build good torque down low, and an absolutely fat midrange, and then as we retard the cam timing up top that just stretches the power band out. Basically, it acts like our LS3-SS1 down low, but with a bit more overlap, and then as it gets into the upper RPM range it acts more like our LS3-SS3, which will peak around 6500rpm, and pull really well out to 7000-7200rpm.

[morepowerjoe]

Thanks again Andrew for your knowledge. I guess it's about time to start saving up for a torque converter. lol

[1JEWLDSSRS]

Originally Posted by morepowerjoe

Thanks again Andrew for your knowledge. I guess it's about time to start saving up for a torque converter. lol

Getcha one! Depending on how big you go, you're really gonna like that mod!! It will be a whole different animal with a stall..