Cam Help for my 408.Please!
07-22-2004, 05:12 PM
#1
Cam Help for my 408.Please! Its a gtp 408 iron block Forged everything. GTP stage 3 heads jessel shaft mount rocker arms comp double springs good to 650 lift. ls6 intake, ported tb,electric water pump,fluid dampner . sits between a front and mid motor plate . jethot lt's (soon to be 1 7/8) its a th400 /12bolt, 4.10 spool. this is a drag car nothing else comes in @ 2900 lbs w/o driver. we had it out 2 times with no traction and it went 126 mph but the et was low (11.0) It currently has a 242 242 hydr. lunati in it. I need some opinions on some stuff. i was thinking 252 258 620 620 108 xer intake xe exhaust. help me out guys. i knw most quick guys here don't want to let there cat out of the bag but im just looking for an opinion.
07-23-2004, 10:55 AM
#7
Originally Posted by ShiznityZ28
its a little depressing my h/c 346 went faster 
if you mph is up, but ET is down, then it sounds like you don't have the right converter. what was your 60'?
What did you put down on the dyno or are you street tuned on a portable wideband?
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07-23-2004, 02:10 PM
#11
Originally Posted by Ragtop 99
Steve:
if you mph is up, but ET is down, then it sounds like you don't have the right converter. what was your 60'?
What did you put down on the dyno or are you street tuned on a portable wideband?
if you mph is up, but ET is down, then it sounds like you don't have the right converter. what was your 60'?
What did you put down on the dyno or are you street tuned on a portable wideband?
i know we had a bad convertor at first (built for 200 shot) but its a 5000 stall in there now. havent made a full pass yet because the car was running like crap. the cam has +4 in it so the motor stops making power @ 6000.
07-23-2004, 02:56 PM
#14
Has the car been tuned correctly?
There is no reason for you to stop making power with that cam at 6000 RPM's.
With that much duration it would take a lot more than 4 degrees built in to stop making power after 6000.
I thing you are asking a good question but to the wrong people.
You need to get those heads flowed and make a custom cam based on the heads.
This is defentially a better way then just guessing.
With GTP Stage 3 heads I am guessing a the cam you are thinking of should be pretty close but that is just a guess.
If you are into racing you should have kept the flow sheets GTP sent you. This could really help.
Call Cam motion and fax them your flow sheets, or Allan Futural, that would be a good start.
Have you dynoed the car?
You say it stops making power at 6000 RPM's how do you know?
There is no reason for you to stop making power with that cam at 6000 RPM's.
With that much duration it would take a lot more than 4 degrees built in to stop making power after 6000.
I thing you are asking a good question but to the wrong people.
You need to get those heads flowed and make a custom cam based on the heads.
This is defentially a better way then just guessing.
With GTP Stage 3 heads I am guessing a the cam you are thinking of should be pretty close but that is just a guess.
If you are into racing you should have kept the flow sheets GTP sent you. This could really help.
Call Cam motion and fax them your flow sheets, or Allan Futural, that would be a good start.
Have you dynoed the car?
You say it stops making power at 6000 RPM's how do you know?
07-23-2004, 03:05 PM
#15
Originally Posted by JZ'sTA
Has the car been tuned correctly?
There is no reason for you to stop making power with that cam at 6000 RPM's.
With that much duration it would take a lot more than 4 degrees built in to stop making power after 6000.
I thing you are asking a good question but to the wrong people.
You need to get those heads flowed and make a custom cam based on the heads.
This is defentially a better way then just guessing.
With GTP Stage 3 heads I am guessing a the cam you are thinking of should be pretty close but that is just a guess.
If you are into racing you should have kept the flow sheets GTP sent you. This could really help.
Call Cam motion and fax them your flow sheets, or Allan Futural, that would be a good start.
Have you dynoed the car?
You say it stops making power at 6000 RPM's how do you know?
There is no reason for you to stop making power with that cam at 6000 RPM's.
With that much duration it would take a lot more than 4 degrees built in to stop making power after 6000.
I thing you are asking a good question but to the wrong people.
You need to get those heads flowed and make a custom cam based on the heads.
This is defentially a better way then just guessing.
With GTP Stage 3 heads I am guessing a the cam you are thinking of should be pretty close but that is just a guess.
If you are into racing you should have kept the flow sheets GTP sent you. This could really help.
Call Cam motion and fax them your flow sheets, or Allan Futural, that would be a good start.
Have you dynoed the car?
You say it stops making power at 6000 RPM's how do you know?
I did not get any flow numbers from GTP. I am going to call craig and see if i can get them. We dynoed it with a tight 3400 stall. and it was done making power at 6000 i don't have the graph. we are going to redyno it early ext week. but i want to get a new cam on its way asap.
07-23-2004, 03:29 PM
#17
Steve did the car weight 2900 w/o driver when u ran the 11.17@120 pass
What were the weather conditions,Reason I ask is u are going 6 MPH quicker than the H/C setup.
If u take the summer pass and compare it to your winter pass it looks like this 408 is well over 8MPH+ better than the H/C setup.I'd play with the susp. first and wait for good air before changing cams.I think that verter is alittle to big too,might be over powering the tires,I'd step it back to around 4000 to 4200.
Thats a BIG MPH increase..
Your making good power w/that baby....
What were the weather conditions,Reason I ask is u are going 6 MPH quicker than the H/C setup.
If u take the summer pass and compare it to your winter pass it looks like this 408 is well over 8MPH+ better than the H/C setup.I'd play with the susp. first and wait for good air before changing cams.I think that verter is alittle to big too,might be over powering the tires,I'd step it back to around 4000 to 4200.
Thats a BIG MPH increase..
Your making good power w/that baby....
Last edited by JS; 07-23-2004 at 03:34 PM.
07-23-2004, 04:00 PM
#18
More info needed to help out further.
Give us some more details on your track pass.
Car weighed 3100 lbs or so I assume.
Had the 5000 stall converter in it or the 3400?
What was your 60 ft?
You time being 126 isn't bad, but that is probally 4 MPH less then what you were hoping for being a full race car and summer time.
What was your peak HP and Torque number? And at what RPM's?
Also if you can remember how much HP were you making 500 RPM's past peak?
EX, If peak was at 6000, what did you make at 6500?
Give us some more details on your track pass.
Car weighed 3100 lbs or so I assume.
Had the 5000 stall converter in it or the 3400?
What was your 60 ft?
You time being 126 isn't bad, but that is probally 4 MPH less then what you were hoping for being a full race car and summer time.
What was your peak HP and Torque number? And at what RPM's?
Also if you can remember how much HP were you making 500 RPM's past peak?
EX, If peak was at 6000, what did you make at 6500?
07-24-2004, 12:32 AM
#20
Originally Posted by Ragtop 99
Steve:
Are you saying the car peaked at 6000 rpm or that you peaked several hundred rpm earlier and were seeing it really dropping by 6000 rpm?
You had 4* advance; what was the LSA? Knowing you, I assume it is 108 - 110
Are you saying the car peaked at 6000 rpm or that you peaked several hundred rpm earlier and were seeing it really dropping by 6000 rpm?
You had 4* advance; what was the LSA? Knowing you, I assume it is 108 - 110