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11-29-2008, 02:32 PM
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#1 | | Teching In
Join Date: Jun 2008
Posts: 47
|  Low 408 results?
Car is a 98 TA M6 3.42 gears stock 10 bolt.
HKE 408
Probe Pistons
Stock 241 Heads Ported/Polished
Stock Compression
238/242 112+2 Custom Cam
Ls6 Intake
42lb injectors
Put down 440/435 on a dynojet.
Seems low for a 408.. any thoughts? Oh and rev limiter is 6600 they only brought it like 5800  | 
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11-29-2008, 02:50 PM
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#2 | | TECH Enthusiast
Join Date: Jun 2002 Location: Kuwait
Posts: 721
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i saw 3 things in your 408 :
1- are your 241 heads realy flow good with high port velocity?
2- stock compression around 10:1 you should be 11:1 to 11.8:1 to make more power.
3- your cam is a little on the low side, it should be more like 244/248 to 248/254 or so.
__________________
Abdullah
2000 green M6 Z28 Mods: SLP flow pac, self ported LS1 heads with stock valves, TSP 233/239 cam, QTP 1-3/4" long tube headers, Borla cat back, Fast 90mm intake, NW 90mm throttle body, BMR adjustable panhard rod, BMR adjustable LCA's, BMR strut tower brace, BMR boxed SFC's, Koni Single Adjustable shocks, ES hyperflex bushings kit.
394 rwhp/370 rwtq SAE corrected dyno tuned. | |
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11-29-2008, 03:00 PM
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#3 | | TECH Apprentice
Join Date: Aug 2005 Location: Ottawa, IL
Posts: 334
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I agree with Zaccagnini, you need to at least port your 241s, bump your compression up to around 11:1, change the can, and you could also ditch the LS6 intake for a FAST setup.
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2000 SS M6 Sebring Silver
SLP Lid | Fast/NW 92/90 | Pacesetter LTs w/ORY | Mufflex 4" w/Spintech Muffler
Speed Inc. SI5 Cam 231/237 .589/.595 112LSA | Full UMI Adj. Suspension | Built T-56 (Six Speed Inc.) | Mcleod RST TD w/Tick Adj. M/C
Moser 9" w/a Spool, 35 spline axles, & 3.89s | Black ZR1s (Street) and Billet Specialties (Strip)
402rwhp and 375rwtq (Tuned by Speed Inc.)
12.10@115 w/1.69 60' (Still working on launching the car) | 
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11-29-2008, 03:01 PM
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#4 | | TECH Regular
Join Date: Apr 2008 Location: Delaware?/South Carolina:)
Posts: 422
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Did you have the 241 heads flowed?
__________________ M6 06 GTO with the RaceProvenMotorsports mod  | |
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11-29-2008, 03:12 PM
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#5 | | Teching In
Join Date: Jun 2008
Posts: 47
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heads sheet...  | |
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11-29-2008, 03:32 PM
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#6 | | TECH Fanatic
Join Date: Aug 2005 Location: Sunny London, UK
Posts: 1,259
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Yeah your heads and intake are holding you back. Probably mainly your intake and TB at present. Put the fast92/92 on and you should gain a good bit. Heads are probably 5-10% off the pace, but Im betting your intake and tb are the biggest bottle neck.
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11-29-2008, 05:13 PM
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#7 | | TECH Regular
Join Date: Mar 2006 Location: Rolesville, NC
Posts: 466
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what are you running for headers and exhaust?
1 3/4" or 1 7/8" or stock ?
IMO 241s are too small of a head for a 408. More like AFR 225s or larger | |
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11-29-2008, 05:35 PM
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#8 | | TECH Apprentice
Join Date: Aug 2004 Location: DFW
Posts: 345
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Quote:
Originally Posted by AU N EGL  what are you running for headers and exhaust?
1 3/4" or 1 7/8" or stock ?
IMO 241s are too small of a head for a 408. More like AFR 225s or larger | I would do Fast 9X/9X and 1 7/8 headers (if you don't already have them) first and see where that puts you. If your power is still not where it should be I would look at a nice set of heads!
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2004 Z06 | Tuned by Quality Motorsports
LME 402 11.5:1 | AFR 205's | Ported Fast 90/90 | Haltech CAI | 244/250 112+4 | Kooks 1 7/8 LT's | Kook's 3" OR-X | Borla Stingers | Ram DD Clutch | 3.90 Gears
512HP 483TQ | |
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11-29-2008, 11:44 PM
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#9 | | Hurricane Season Mod
Join Date: Nov 2001 Location: Tampa Bay
Posts: 9,299
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if the dyno operator stopped the pull at 5800 on purpose, they dont know what they are doing with these cars.
ls6 intake is holding you back no more than 25 rwhp based on that cam/compression | |
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11-30-2008, 02:00 AM
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#10 | | TECH Enthusiast
Join Date: Apr 2006 Location: OKLAHOMA
Posts: 701
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i think fast 92/92=20-30 ,1 7/8 LT's=10,better heads 10-20,bigger cam 15-25
so anywhere to 50-80 more rwhp in that combo
__________________ 98 Z28,408-E.T 255's,big cam,sheetmetal intake,wilson 105mm,1 7/8 LT's,3" td's,moser 12 bolt,asp ud pulley,spohn adj ta,spohn lca's,TH400,3600 stall,1 nx kit,
5 stars with 26" et streets
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11-30-2008, 08:21 AM
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#11 | | 11 Second Club
Join Date: Jul 2003 Location: EARTH
Posts: 3,044
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IMO The numbers are great for your mods still have a lot left on the table.
compresstion, heads, intake , TB , cam, headers, RPM and tune.
wih these mods 490+rwhp shouldnt be a problem.
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11-30-2008, 09:25 AM
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#12 | | 11 Second Club
Join Date: May 2007 Location: southwest Wisconsin
Posts: 316
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i have very similar cam, and tsp ls6 stage 2.5 heads, with a fast 90/90 #s in sig. I just got some arh 1/78" long tubes to get ready for bigger heads and cam after next season. buying things slowly. I should jump to over 500rwhp with better heads, cam, exhaust. YOu are right on track with what you have now. The power is there uncork it when you get the money.
__________________ 98 T/A M6 a few mods 11.23@124 stock motor on n20,new 402, fast90/90 tsp ls6 2.5 heads, comp 238/240 605/609 (small cam) full weight 12 bolt 3.73, too much else 469rwhp 445 rwt n/a 619/658 150 shot  | |
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11-30-2008, 10:03 AM
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#13 | | TECH Enthusiast
Join Date: Jun 2002 Location: Kuwait
Posts: 721
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Quote:
Originally Posted by Abdullah i saw 3 things in your 408 :
1- are your 241 heads realy flow good with high port velocity?
2- stock compression around 10:1 you should be 11:1 to 11.8:1 to make more power.
3- your cam is a little on the low side, it should be more like 244/248 to 248/254 or so. | oh yeah, i forgot ditch the LS6 intake and add Fast 92/92 to the mods above.
btw Zaccagnini, your dyno numbers look good for the mods you have.
__________________
Abdullah
2000 green M6 Z28 Mods: SLP flow pac, self ported LS1 heads with stock valves, TSP 233/239 cam, QTP 1-3/4" long tube headers, Borla cat back, Fast 90mm intake, NW 90mm throttle body, BMR adjustable panhard rod, BMR adjustable LCA's, BMR strut tower brace, BMR boxed SFC's, Koni Single Adjustable shocks, ES hyperflex bushings kit.
394 rwhp/370 rwtq SAE corrected dyno tuned.
Last edited by Abdullah; 11-30-2008 at 02:07 PM..
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11-30-2008, 10:41 AM
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#14 | | Teching In
Join Date: Jun 2008
Posts: 47
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Cool thanks for the help guys, going shopping!  | |
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11-30-2008, 12:47 PM
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#15 | | TECH Regular
Join Date: Mar 2006 Location: Rolesville, NC
Posts: 466
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Quote:
Originally Posted by GMCHammer I would do Fast 9X/9X and 1 7/8 headers (if you don't already have them) first and see where that puts you. If your power is still not where it should be I would look at a nice set of heads! | ABSOLUTELY Fast 9x/9x and 1 7/8s headers | |
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11-30-2008, 01:52 PM
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#16 | | TECH Addict
Join Date: Jul 2002 Location: Somewhere I Belong
Posts: 2,794
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Quote:
Originally Posted by gator's 99TA if the dyno operator stopped the pull at 5800 on purpose, they dont know what they are doing with these cars. | 
As they stated above gettin the right stuff and you'll be happy all the way  peace
__________________ 2004 Corvette Z06
- Bone Stock -
Dyno'd : 365rwhp & 358rwtq SAE Thanks to MTI 'n Hany aka Houston999 | |
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12-01-2008, 08:27 PM
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#17 | | LS1TECH Sponsor
Join Date: Jun 2002 Location: Atlanta
Posts: 519
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Get a set of Trickflows and a Ported Fast and hold on. Next time on the dyno rev that car out till hit bangs.
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12-01-2008, 10:36 PM
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#18 | | Launching!
Join Date: Jan 2006
Posts: 273
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need to lose those heads...
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2001 SOM Camaro SS M6
405/390 | |
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12-01-2008, 11:41 PM
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#19 | | TECH Fanatic
Join Date: May 2004 Location: Mesa, Arizona
Posts: 1,566
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A little bump in the compression (11:1 is a perfect mid point) by either changing head gaskets or swapping to a different cylinder head thats been milled would be a great starting point. I'd look into a "premium" set of cylinder heads if the money is available OR even a great "budget" head like TEA or ETP ported 243 castings if you're trying to save a little coin.
I'm sure that cam is just fine. There's no reason to try and stick a donkey dick cam in there. You'll just wind up being disappointed with the results. Also, there is NOTHING wrong with 1 3/4's on a 402/408 motor. Again, you'll go through all that hassle and spend all that time and money on nothing more than a "few" ponies upstairs and possibly negate all gains made by losing a shit load down low.
Heads and a little bump in compression. After that, see where you're at and then start considering the fast 90/90 or 92/92
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12-02-2008, 12:18 AM
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#20 | | LS1TECH Sponsor
Join Date: Apr 2003 Location: Chicago
Posts: 1,657
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Thats about the same power my boost 402 was making pre turbos, 10.3:1 compression, stock Dart heads flow 300cfm, 236/242 cam, it made 451rwhp, so I put turbos on it and haven't looked back.
Those pistons must be dished? need more compression, cometic gaskets with tighter quench, depends on how those pistons setup, if they are at 0 deck, I would go with .040" gasket. Mill the heads down to 60cc.
and FAST intake
but pulls only went to 5800 or am I reading that wrong?
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Last edited by Fraser@SpeedInc; 12-02-2008 at 12:24 AM..
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