suggestions 408 engine gurus 2slow? build sheet inside
your car is a pig like mine it sounds like. with a cage and sound system, 2 bottle n20 kit it is loaded down. and with the restrictions in the intake track it is not breathing well. free up the intake/tb and it will help but . 10* or so bigger on the cam will also help quite a bit if the heads are worked. but you will need to do both the cam/ intake tb change with a tune to get where you want it to be imo.
Have the heads opened up, Total Engine Airflow is a sponsor here, they do great work, I'll never use anyone else. With a 225 or 235cc runner you can run a smaller cam and make power, the Heads on the LSx's are the way to go, look at all the top engine builders there's one thing in common with the fastest cars "great heads", you want to flow at least 320 intake 280 exhaust, then play with the cam latter, plenty of guys makeing power with a MS3 cam which is similar to yours.
Get a used FAST 92/92 to open up the top end, the engine needs to suck some air too. Less than $1k used.
Get a used FAST 92/92 to open up the top end, the engine needs to suck some air too. Less than $1k used.
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AFR 205's/408 lq 9 Talked to LG motorsports yesterday and they told not to worry about over caming my heads.They said they have had good results w/205's(ported) and sometimes better results than the 225's.I guess this may be because they may have a wider power band and make more torque @ a low rpm ?He really didnt have time to explain.I ran 11.71 @ 115.5 last weekend....4.11 gears and 26 in dr's.The car was taching 6500 through the traps .I have some 27 in. hoosiers coming.... ....hope to pick up some mph in my quest for a 11.0 pass.
Last edited by Lacajun; Sep 10, 2010 at 12:56 PM. Reason: add text
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Pigs are nice your car is a pig like mine it sounds like. with a cage and sound system, 2 bottle n20 kit it is loaded down. and with the restrictions in the intake track it is not breathing well. free up the intake/tb and it will help but . 10* or so bigger on the cam will also help quite a bit if the heads are worked. but you will need to do both the cam/ intake tb change with a tune to get where you want it to be imo.
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You should run at least a 242/244 cam in that 408, maybe even a 248/252. Also +1 on the 102mm FAST intake and tb. Then you should be making around his claimed 525rwhp.
I would leave the heads right now and see where that would put you first before getting some AFR230s or something and spending a lot.
I would leave the heads right now and see where that would put you first before getting some AFR230s or something and spending a lot.
Last edited by camz28arro; Sep 11, 2010 at 11:24 AM.
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thanks 
I'll be another to say that topend needs out of there and go bigger. If you want a straight up drag car then put the biggest thing you can in there. If you want a street car that will perform then cam it in the low to mid 240s teetering on .600 lift.
I don't think that car made 525 truthfully, my car at sea-level with a cam bigger than that through a 6 speed made 508hp/478tq. Can't say it didn't because it could be a happy dyno. But that 408 should run faster than that, and that topend seems way mis-matched for that car. Truthfully I am in the same boat and need heads like its my job, but you should have nothing smaller than 225cc heads if you want a performer along with atleast a ported FAST92 or FAST102 combo.
I'm ashamed for posting my times but made only 2 runs I made with my 408, the fastest was my 2nd run:
60'-2.4
1/8-9.0@90
1/4-12.1@122 although the 32mph between the 1/8-1/4 shows power
That was with a massively bogging 60' and hitting the rev limiter in 2nd and 3rd. Your mph compared to my crappy run should be a tad higher or match it I imagine if your making 525whp. Something is definitely up somewhere in your powerband fella.
Although it's not as fast as you wanted, congrats though fella. Its still a respectable car
I don't think that car made 525 truthfully, my car at sea-level with a cam bigger than that through a 6 speed made 508hp/478tq. Can't say it didn't because it could be a happy dyno. But that 408 should run faster than that, and that topend seems way mis-matched for that car. Truthfully I am in the same boat and need heads like its my job, but you should have nothing smaller than 225cc heads if you want a performer along with atleast a ported FAST92 or FAST102 combo.
I'm ashamed for posting my times but made only 2 runs I made with my 408, the fastest was my 2nd run:
60'-2.4
1/8-9.0@90
1/4-12.1@122
although the 32mph between the 1/8-1/4 shows powerThat was with a massively bogging 60' and hitting the rev limiter in 2nd and 3rd. Your mph compared to my crappy run should be a tad higher or match it I imagine if your making 525whp. Something is definitely up somewhere in your powerband fella.
Although it's not as fast as you wanted, congrats though fella. Its still a respectable car
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respectable car Thanks...yeah I no but I got my heart set on low low 11's......thinking of doing a victor jr. and t/b....because of the cost of a fast 90 or 102 set up.Just got a set of billet secialties and a pair of 27x 11.50's.This should help some being they are not as heavy as my zr1's.Going w/skinnies on the front 2.
if you are wanting to change cams ptv shouldn't be an issue. your pistons have pretty big reliefs in them. heck even a stock motor can handle a fairly large stick without reliefs.
Thanks...yeah I no but I got my heart set on low low 11's......thinking of doing a victor jr. and t/b....because of the cost of a fast 90 or 102 set up.Just got a set of billet secialties and a pair of 27x 11.50's.This should help some being they are not as heavy as my zr1's.Going w/skinnies on the front 2.
I'm watching this thread as my motor comes thursday, I'm going with a little TSP V2 cam on a 404 LQ9, 3400 Circle-D Stall, but I have a great set of TEA LS6 Stage 2 heads, FAST 92 / NW 92... could care less about the dyno numbers, I want to see 11.3 in the quarter !
Last edited by KC&97TA; Sep 13, 2010 at 09:17 PM.
Something is very wrong. There are cam-only LS1 cars trapping higher then what you are.
Are you sure it's even a 408?
Either the car is loaded to hilt and weighs 4,000lbs with a huge stereo system, extremely bad tune, or the motor is shot.
A 408 even if limited with AFR205/Fast 78/Medium cam should trap more then 115mph. I'd run a compression test.
Something doesn't make sense. Your 60' is decent... Trap speed seems way low to me.
Are you sure it's even a 408?
Either the car is loaded to hilt and weighs 4,000lbs with a huge stereo system, extremely bad tune, or the motor is shot.
A 408 even if limited with AFR205/Fast 78/Medium cam should trap more then 115mph. I'd run a compression test.
Something doesn't make sense. Your 60' is decent... Trap speed seems way low to me.
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10-4 yeah car is 3840 w/me in it + the last time it was tuned it was tuned for n2o...I figure it has some time n pulled....I sold a 99 that ran 11.90's w/a 383 so i wasn't too happy w/the 408.......the car seemed like it was running out of gear @ the big end.
Put that girl on a diet!
