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LS6--->LSX Intake Bolt-On Dyno Results

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Old 03-26-2004, 02:40 PM   #1
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Angry LS6--->LSX Intake Bolt-On Dyno Results

I did a before/after back-to-back test going from the ls6 intake to the lsx to see the results and here they are.

I lost 1hp and 1 torque switching from the LS6 intake to the 78mm LSX Intake.

Here's the graph comparing the best runs, ignore the spike with the LSX and watch the curves at a peak of 5600rpm the hp is down about 1 from the ls6 intake.
http://www.cobraeater.cz28.com/cgi-b...20VS%20LSX.JPG

Here's the ls6 intake runs.
http://www.cobraeater.cz28.com/cgi-b...yno%20Runs.jpg

The lsx intake runs.
http://www.cobraeater.cz28.com/cgi-b...yno%20Runs.jpg

So, it looks like at the all bolt-on level the engine just doesn't need any more air than the ls6 intake provides.

BTW, I gained 7hp and 10 torque going from the ls1 intake to the ls6 intake.
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Old 03-26-2004, 02:49 PM   #2
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You need a good set of heads and a big cam to really enjoy it! Spend the money!
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Old 03-26-2004, 02:52 PM   #3
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You could send me the LSX intake! It would be an upgrade from stock for me, then we could compare notes.


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Old 03-26-2004, 04:07 PM   #4
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Dam that Blows , sorry to hear that. Im not impressed with the results ive been seeing, Glad I picked up an LS6 intake used for 300.00 shipped instead of the LSX.
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Old 03-26-2004, 06:20 PM   #5
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Quote:
Originally Posted by Cobraeater
I did a before/after back-to-back test going from the ls6 intake to the lsx to see the results and here they are.

I lost 1hp and 1 torque switching from the LS6 intake to the 78mm LSX Intake.

Here's the graph comparing the best runs, ignore the spike with the LSX and watch the curves at a peak of 5600rpm the hp is down about 1 from the ls6 intake.
http://www.cobraeater.cz28.com/cgi-b...20VS%20LSX.JPG

Here's the ls6 intake runs.
http://www.cobraeater.cz28.com/cgi-b...yno%20Runs.jpg

The lsx intake runs.
http://www.cobraeater.cz28.com/cgi-b...yno%20Runs.jpg

So, it looks like at the all bolt-on level the engine just doesn't need any more air than the ls6 intake provides.

BTW, I gained 7hp and 10 torque going from the ls1 intake to the ls6 intake.
If your stock heads flow 230cfm and you r ls6 intake can flow almost 280, Why would you think you would gain alot your intake already out flows the heads by a large margin. You might gain a little velocity but with stock heads it wont help much. That is just my .02. If it is even worth that.
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Old 03-26-2004, 06:35 PM   #6
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did you do any tuning after the lsx swap?
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Old 03-26-2004, 06:57 PM   #7
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Looks like the LSX did lean out your A/F a bit.Same thing happened to me.We then richened it up and gained 5-10 across the rev range.
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Old 03-26-2004, 07:49 PM   #8
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Quote:
Originally Posted by Cobraeater
I did a before/after back-to-back test going from the ls6 intake to the lsx to see the results and here they are.

I lost 1hp and 1 torque switching from the LS6 intake to the 78mm LSX Intake.

Here's the graph comparing the best runs, ignore the spike with the LSX and watch the curves at a peak of 5600rpm the hp is down about 1 from the ls6 intake.
http://www.cobraeater.cz28.com/cgi-b...20VS%20LSX.JPG

Here's the ls6 intake runs.
http://www.cobraeater.cz28.com/cgi-b...yno%20Runs.jpg



The lsx intake runs.
http://www.cobraeater.cz28.com/cgi-b...yno%20Runs.jpg

So, it looks like at the all bolt-on level the engine just doesn't need any more air than the ls6 intake provides.

BTW, I gained 7hp and 10 torque going from the ls1 intake to the ls6 intake.
With a simple tune you should gain around 10hp/10tq. From what I've seen about 80% of the people who get the LSX gain the HP in the tune. Others just get lucky and get most of the gain right away based on thier set-up. Not to mention, as others have suggested, there is probably more power left on the table from the LSX with a cam and/or head swap.

Also, did you check the TB problem many people have been having? Just checking to be sure. Good luck with your purchace. If you end up not liking it I'll take it off your hands from ya.
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Old 03-27-2004, 12:51 AM   #9
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I had a full LS1 Edit tune done right after the lsx intake swap.

The a/f was set to 13.0 all across the rev range and it still made the same power.

The 98-99 throttle body cams open 100% with the lsx since they're smaller than the 00-02 tb cams, so I didn't need to grind on it or anything.
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Old 03-27-2004, 02:50 PM   #10
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That sucks man but thank you for sharing the info.
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Old 03-27-2004, 02:57 PM   #11
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Quote:
Originally Posted by Cobraeater
I had a full LS1 Edit tune done right after the lsx intake swap.

The a/f was set to 13.0 all across the rev range and it still made the same power.

The 98-99 throttle body cams open 100% with the lsx since they're smaller than the 00-02 tb cams, so I didn't need to grind on it or anything.
Ouch...Well I guess all I can say is either wait until you go into the engine to see if there are any gains or try to resell the intake to get some of your money back. Sorry to hear about your luck.
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Old 03-27-2004, 02:59 PM   #12
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Quote:
Originally Posted by Revelation222
Ouch...Well I guess all I can say is either wait until you go into the engine to see if there are any gains or try to resell the intake to get some of your money back. Sorry to hear about your luck.
Oh...Is it possible that the Shaner TB that you recieved back in place of your old TB was of a newer design? It's a long shot but im just trying to look at it from every angle.
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Old 03-27-2004, 06:01 PM   #13
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Quote:
Originally Posted by 9T9BlueTA
That sucks man but thank you for sharing the info.
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Old 03-27-2004, 07:04 PM   #14
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Quote:
Originally Posted by Cobraeater
The 98-99 throttle body cams open 100% with the lsx since they're smaller than the 00-02 tb cams, so I didn't need to grind on it or anything.

So you are still using the stock throttle body?
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Old 03-27-2004, 08:22 PM   #15
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Quote:
Originally Posted by Revelation222
Oh...Is it possible that the Shaner TB that you recieved back in place of your old TB was of a newer design? It's a long shot but im just trying to look at it from every angle.
No, it was just another 98-99 tb like what was on my car expect Shaner ported it.

GM made the throttle body cams for 98-99 smaller than the 00-02 for some reason.
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Old 03-27-2004, 08:29 PM   #16
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that blows bro..
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Old 03-27-2004, 09:24 PM   #17
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Quote:
Originally Posted by Cobraeater
I had a full LS1 Edit tune done right after the lsx intake swap.

The a/f was set to 13.0 all across the rev range and it still made the same power.
Well, it IS pretty obvious from your grath that your A/F ratio have gone up with the LSX.
If you are saying that your graph is BEFORE the tuning, and tuning didn't change much, then I would still check if, f.e., the timing is right. Why don't you post the graph after tuning?
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Old 03-28-2004, 01:40 AM   #18
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Quote:
Originally Posted by Iv_z28
Well, it IS pretty obvious from your grath that your A/F ratio have gone up with the LSX.
If you are saying that your graph is BEFORE the tuning, and tuning didn't change much, then I would still check if, f.e., the timing is right. Why don't you post the graph after tuning?

The dyno graphs above were all done on the stock tune.

I'm going to MMT/HPE probably on Monday, so I'll post the tuned dyno graphs late Monday or Tuesday.

The timing was bumped up from 24-26* in the midrange to 27* and in the upper rpms it was 28* with the stock tune and ls1 edit.
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Old 03-29-2004, 12:19 AM   #19
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Damn I was really hoping the LSX intake would be our savior intake. I am a little confused though was your car actually tuned after the above dynos that you posted to correct for it being a tad leaner? It sounds like it was but that your graph looked the same as before the tune with the leaner a/f ratio. Did I understand right?
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Old 03-29-2004, 12:23 AM   #20
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I had the car tuned after the graphs above to a 13.0 a/f and I'll post those tuned graphs tomorrow or Tuesday.
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Old 03-29-2004, 12:23 AM
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