ROJO99

My baseline dyno was a 99 MN6 LS1 with only engine Mod being a Blackwing. I just dyno'd the car after the change of intake being the only engine change. I do need to mention that the last dyno was on the BFG DR's mounted. Since I have changed to the F1GSD3's for the winter season. How much can this effect the outcome? Not much I believe.

I started at an average of 315.3HP and 323.1TQ. My average of 5 pulls after the LS6 intake swap is 322.9HP and 329.3TQ. This is a net positive gain of 7.6HP and 6.2TQ. Not bad but I was hopeful for more. I did not do the coolant bypass on the Throttlebody. Long tube headers would likely really compliment the new intake.

One special note. During back to back pulls I removed the tube that connects the TB to the passenger side valve cover (PCV). The resultant tube on the TB was capped. This net another positve gain of .6HP. I have re-connected the tube and will be thinking of adding a filter on the tube to permenantly remove the hot vapor from the TB.

Here's my report so what do you think?

davered00ss

iTrader: (4)

Good information. I did the ls6 intake swap, but have not dyno'd since.

Patrick G

iTrader: (14)

Nice gains. Add headers and some cam duration and you'll see another 10 rwhp from the intake alone...easy.

Not too many people report seeing gains on a bone stock motor. Glad you did. This confirms why '01-02 F-bodies make a little more power than ''98-00 models, even though they have smaller cams. The intake does help. A 2000 model with the bigger cam like the '98-99s and the better manifolds like the '01-02s would make the most power of all years, but it's nothing compared to what any model can make with long tubes and a bigger cam, LOL.

TheBowtieboy

iTrader: (6)

You might look into a better exhaust/muffler.
.....cheap way to free up some HP

ROJO99

I have hought about a Cat Back, but decided to channel the funds towards LT's.

luv2spd

iTrader: (1)

Go with the longtubes and cutout.

TheBowtieboy

iTrader: (6)

You will definitely see much better results from a set of long tubes and a cut out.....be thinking about a tune as well for best results

dug

iTrader: (10)

Dont forget about a 2000 car with the 241 heads. It would be interesting to see how strong a car with a 2001 intake, 241 heads, and the 98-00 cam and 2000-02 exhaust manifolds would be.

Add a loudmouth and lid it might be the proverbial factory freak.

jlrz28

iTrader: (7)

Yeah here is what I did with Macs and catted y pipe

Casperws6

what's so special about the 241 heads? just curious because i have those heads.

dug

iTrader: (10)

Nothing much. They just flow a lil better than the older castings. I read the old heads are sand castings where the newer ones are mold castings. The mold castings is supposed to be smoother.

black00TA

iTrader: (3)

and if i have a 2000 then i have this "241" head?

Patrick G

iTrader: (14)

I have a 2000 WS6 built in Feb. 2000 and it has 853 heads.

JEB99TA

iTrader: (32)

I don't think you can pin it down accurately unless you have your car tuned on the same dyno 9same weather conditions) before and after the swap. Once you do the swap, you'll need to tune it again to determine an accurate gain. I say this because the additional airflow should throw off the A/F by .2 - .3. That's only one factor.

I've seen dyno sheets that show the LS6 swap has yielded nearly 30 RWHP gains. Typically, I believe 12-15 RWHP is about right. With a cam of very large duration, and full bolt-ons, I think you could see 25RWHP.

JEB99TA

iTrader: (32)

Plus, being a 1999, it might cause you to run your 26.6 injectors near/at their 80% load cycle capacity by the PCM pulling too much fuel because of the extra air intake. I don't know much about this ****, so, it's only my opinion.