408ci redynoed and tuned!!!
408ci redynoed and tuned!!! As u may all know I got my 408 dynoed by Hpe last saturday with Chuck,with semi good results.I went to my local perfromance shop which has Dynojet,cranked up HP tuners and plugged in air/fuel meter.Right off the bat we did a baseline we got almost the same 434hp and 380tq air fuel was lean at 14.4.We added some fuel got it down to 13.8 we went 440hp and 398tq.Next run we pulled 3 degrees of timing down to 24deg car put down 443hp 408tq,next run we added more fuel, air/fuel was right at 13.4 car pulled 447hp 414tq.We stopped there as it was already late,all these runs were the converter unlocked Ill post the gragh later,we have a small dip at about 6000rpm then it starts up again gragh is the same from 5000rpm 445etc...drops at 6000rpm for a 150rpm range then continues back up where it left off,peaking at 6600rpm.Over all it went good for a ameture tuner,Ill be going to the track tonight and see if those extra 13hp and 34ft/lbs do any good!!
My friend blue SS we gained 18hp up top and 25ft/lbs.We just took fuel away as it was rich in our baseline at 12.1afr.Leaned her to a good 13.3 18hp and 20ft/lbs,took away 2 degrees of timing down to 25degr no luck but little bit rich at 12.9 added more back the timng Same hp but 5ft/lbs more.We ended up with 398hp and 375tq.Increase of 18hp and 25ft/lbs,all with converter unlocked,car idles way better,very smooth.
Overall wasnt bad at all as a ameture tuner, did a good job!!All keep u all posted tonight!!!!
My friend blue SS we gained 18hp up top and 25ft/lbs.We just took fuel away as it was rich in our baseline at 12.1afr.Leaned her to a good 13.3 18hp and 20ft/lbs,took away 2 degrees of timing down to 25degr no luck but little bit rich at 12.9 added more back the timng Same hp but 5ft/lbs more.We ended up with 398hp and 375tq.Increase of 18hp and 25ft/lbs,all with converter unlocked,car idles way better,very smooth.
Overall wasnt bad at all as a ameture tuner, did a good job!!All keep u all posted tonight!!!!
447 and 414 sound good for your auto, but power under the curve is where it's at and that is where your 408 will shine. Confused on why your power was dipping though, I'm interested to see this graph when you post it.
Originally Posted by marine02ss
We have a small dip at about 6000rpm then it starts up again gragh is the same from 5000rpm 445etc...drops at 6000rpm for a 150rpm range then continues back up where it left off,peaking at 6600rpm.
For what it's worth, 6000 rpm is probably too high of a coupling point for your combination. Sounds like your engine torque is blowing right through your converter. Might be time to examine your stall.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
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2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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Originally Posted by marine02ss
As u may all know I got my 408 dynoed by Hpe last saturday with Chuck,with semi good results.Right off the bat we did a baseline we got almost the same 434hp and 380tq air fuel was lean at 14.4.
Nice results!!! I had my original tune done by HPE also, but when I got to a local dyno I had the same problem, i was lean around 14.5 got my HP tuner dialed in the AF and messed with the timming and picked quite a bit of power. Dont know if its thier AF meter thats off or if its a altitude/weather issue between Houston and where I live. Anyhow nice #'s.
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Verdad Gallardo Thats what I was thinking also that,it has to be a converter issue since we logged the run, we went back to look at the vcm scanner,we didnt see any knock or anything weird happen,no misfire etc......The converter is a TCI 3500,do u really think were blowing right threw it,Cause any lower stall would probably not help.I have a yank PT4000 that I used to run in my 91rs LS1 powered camaro,I lost almost 8 tenths when I switch over to the TCI in that car.What should I do?I know the yank rocks and my 408 would love it,but I put in the TCI in my 408 reason being I drive it everyday.Is therer anyway I can have the shift extension of the PT4000 but feel tight as a 3500,I know I want my cake also,but what can be done?Suggestions
Keep the lower one. Where pulling my Vig 3800 and shipping for a restall. Think I`m going back to a 3200 which is what it was when I bought it. The 408 makes so much low TRQ. You don`t need to go real high with it. Then spraying will flash it higher. My 3800 is killing me right now! Good luck and let us know you new numbers at the track!
Originally Posted by marine02ss
Thats what I was thinking also that,it has to be a converter issue since we logged the run, we went back to look at the vcm scanner,we didnt see any knock or anything weird happen,no misfire etc......The converter is a TCI 3500,do u really think were blowing right threw it,Cause any lower stall would probably not help.I have a yank PT4000 that I used to run in my 91rs LS1 powered camaro,I lost almost 8 tenths when I switch over to the TCI in that car.What should I do?I know the yank rocks and my 408 would love it,but I put in the TCI in my 408 reason being I drive it everyday.Is therer anyway I can have the shift extension of the PT4000 but feel tight as a 3500,I know I want my cake also,but what can be done?Suggestions
wow good feedback patrickg....well i was there on saturday when marine02ss re-dyno tuned his car with Dmoney's HP tuners at our local speed shop "modern street performance"....and man was i impressed with the gain the he got with that 408 and also with the gains my buddy got in his blue 02 ss.....all in all i would recommend HP Tuners to anyone....it is a great program!!!!....Dmoney is a good guy and did some great tuning on the 408 popcorn machine and the blue ss....but yeah i would just recommend marine02ss convert his 02 ss to a 6 speed then to have to be dicking around with all this converter b.s. ....but that just my .02 
www.modernstreetperformance.com
that is where we had the cars re-dynoed at
p.s. dmoney likes men
www.modernstreetperformance.com
that is where we had the cars re-dynoed at
p.s. dmoney likes men
Good gains.
From what I have read, it seems that Chuck doesn't want to purchase new sensors for his Wideband, so he uses other methods to calcuate the AF.
Dont know if its thier AF meter thats off or if its a altitude/weather issue between Houston and where I live. Anyhow nice #'s.
Originally Posted by Jimmy P
Good gains.
From what I have read, it seems that Chuck doesn't want to purchase new sensors for his Wideband, so he uses other methods to calcuate the AF.
From what I have read, it seems that Chuck doesn't want to purchase new sensors for his Wideband, so he uses other methods to calcuate the AF.
I can't imagine why his car was running rich, when it was first tuned HPE didn't even use a o2 sensor 
duh. Im glad to see you got your car putting down some good numbers, even after it was tuned by a proffesional. Good luck with the stall.
duh. Im glad to see you got your car putting down some good numbers, even after it was tuned by a proffesional. Good luck with the stall. 
ya dyno numbers are not evreything, but in the last thread most were dismayed at the lack of customer service. most people thought he could get some more out of his car, and now he has proved that. maybe he might be hitting the 10's now.