Cam only LS7 dissapointing dyno numbers
05-27-2015, 09:53 PM
#22
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You have alot goin wrong wrong here. But even with all the wrong it should've made more power than that. We made a little over 450whp with that cam back in 03 or 04 with just a 346 and a ls6 intake. Car had shitty mac 1 3/4 mid length headers to.
05-27-2015, 10:55 PM
#23
That 3.5" intake tube is doing you no favors. You need to upgrade to a 4" and use as big a radius bend(s) as possible. As asked, what size throttle body?
I would try to have only one 90 degree bend. Maybe angled up so the air filter will clear the rear bar or even straight up.
I would try to have only one 90 degree bend. Maybe angled up so the air filter will clear the rear bar or even straight up.
05-27-2015, 11:03 PM
#24
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That 3.5" intake tube is doing you no favors. You need to upgrade to a 4" and use as big a radius bend(s) as possible. As asked, what size throttle body?
I would try to have only one 90 degree bend. Maybe angled up so the air filter will clear the rear bar or even straight up.
I would try to have only one 90 degree bend. Maybe angled up so the air filter will clear the rear bar or even straight up.
05-27-2015, 11:51 PM
#25
I pulled it apart and verified that the cam was installed dot to dot. I do not have a degree wheel. I suppose the cam grind could be off from the manufacture. The valve springs are the originals. Not sure how many hours are on them. Sand cars have no odometers so there is really no way to tell.
05-28-2015, 10:13 AM
#28
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Thank you for the insight. I wish I would have thought of asking for the map readings. Next time I get it on the dyno I will. Going to pull the heads and get them inspected/freshened up. Might get a cam designed specifically for the LS7 from one of the vendors here. I will build a new 4" intake tube before I do anything else.
05-28-2015, 04:19 PM
#30
Thank you for the insight. I wish I would have thought of asking for the map readings. Next time I get it on the dyno I will. Going to pull the heads and get them inspected/freshened up. Might get a cam designed specifically for the LS7 from one of the vendors here. I will build a new 4" intake tube before I do anything else.
05-29-2015, 08:42 AM
#33
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Its the Cam! It couldnt be more wrong for the application!!!
Seriously! There is nothing wrong with any other part of your engine! At least nothing that will hold it back real bad,
Id get a grind like this 244in 254ex .640 lift 114 LSA
You would gain a Ton everywhere!
Seriously! There is nothing wrong with any other part of your engine! At least nothing that will hold it back real bad,
Id get a grind like this 244in 254ex .640 lift 114 LSA
You would gain a Ton everywhere!
06-02-2015, 01:45 AM
#36
Ls2 90mm TBs have a large step cast into them that disrupts airflow. That 90* bend is also killing power. Run a straight shot style intake that gets the coolest air possible. I'd also get that TB ported before changing cams. A FAST102 is definitely worth power over the stock ls7 intake... But will be $1k once you change the fuel rails out to make it work. The headers are also rather small.... But try the ported TB/straight shot 4" intake first! K&N ls7 air filter on my last setup. I made a disappointing 520rwhp/472rwtq on my LS7.. But it did go 111mph 1/8 best and 138mph with mods similar to yours. 1 7/8" primaries and 243/256 cam though.
06-02-2015, 08:22 AM
#37
Ls2 90mm TBs have a large step cast into them that disrupts airflow. That 90* bend is also killing power. Run a straight shot style intake that gets the coolest air possible. I'd also get that TB ported before changing cams. A FAST102 is definitely worth power over the stock ls7 intake... But will be $1k once you change the fuel rails out to make it work. The headers are also rather small.... But try the ported TB/straight shot 4" intake first! K&N ls7 air filter on my last setup. I made a disappointing 520rwhp/472rwtq on my LS7.. But it did go 111mph 1/8 best and 138mph with mods similar to yours. 1 7/8" primaries and 243/256 cam though.
06-02-2015, 05:30 PM
#38
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Change your valve springs.. I bet it's floating the valves..
06-03-2015, 02:42 PM
#39
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I am pulling the heads and sending them out for cnc porting, valves/guide upgrade. I will also have new springs/keepers installed for the Kartech Torquer 110 cam I just picked up. When I get it back together my son will fab a 4" intake tube and then I will get it back on the dyno.
I will post up the results this fall when it's done.
I will post up the results this fall when it's done.