98Z28CobraKiller

iTrader: (17)

OP, I'm guessing that your red line is torque on the graph. If so, it could be a drivetrain problem. Slipping clutch or blowing thru the converter.

Tell us about the drivetrain.

pm2630

Tothe guy with the harrop supercharger-- Im a buyer at the right price but yuo just need a shorter pushrod,you will still have the same problem with any set up until you do as I sugested. You will be satisfied.Im making 751hp@4800rpm and holds that until 6100.,with787lb tq from2600 to5100 10lb of boost.Had it at830hp and860lb 12lb of boost but it did not like it after 3 minutes@ wot.I have 1.875 headers now but is makes 775hp with 2.00 headers and the same yune. I run a 29 foot boat with 2 of these motors. Glad I could help Paul

pm2630

Tothe guy with the harrop supercharger-- Im a buyer at the right price but yuo just need a shorter pushrod,you will still have the same problem with any set up until you do as I sugested. You will be satisfied.Im making 751hp@4800rpm and holds that until 6100.,with787lb tq from2600 to5100 10lb of boost.Had it at830hp and860lb 12lb of boost but it did not like it after 3 minutes@ wot.I have 1.875 headers now but is makes 775hp with 2.00 headers and the same yune. I run a 29 foot boat with 2 of these motors. Glad I could help Paul

ryarbrough

iTrader: (18)

Do you know something about his motor that we dont? Sounds like you're making stuff up.

OP... Do you have any logs?

pm2630

Got my dyno sheet out Im bad its755tq @ 2700rpm and 791@4300 andholds it till4800 and then starts to fall off. hp holds 751 from 5300 till6600 stoped the pull. had the same problem he had or has. mine is FIXED that is exatly why I know EXACTLY what is wrong. It was a twin to mine and that is how I fixed it Dont need to make any thing up just trying to help as he asked

ryarbrough

iTrader: (18)

I know you are trying to help, but nobody has enough info here to say anything about the cause if the problem. No need to jump to conclusions about pushrods when there may be easier issues to fix.

pm2630

Dont you think he has already tried everything else, not ony him but his dyno men and friends.I spent a fortune looking for my problem,cam ,springs,comp.,timing,fuel,coils , Imean everything.Ill say it again .050 shorter pushrod. sorry I dont have any post WIFE got mad and erased everything.She has to do everything on the comp. for me I can bearly turn tis thin on ,sorry for the double post ,didnt mean to. paul

Hank Peabody

iTrader: (2)

The original poster hasnt replied lately maybe he gave up I bet it is something simple like the pushrods, might as well rule that out since Paul had that same problem with the same symptoms, if you havent given up! If you figure it out let us know I am very interested, sounds like an awesome setup, or could be if this one little thing is figured out.

corvette_uae1

hey pm thanks for sharing these infos well what i know if u have a shorter or wrong lent pushrod u will hear some noice but no noise in my car ! however i would like to try i spend more money trying to figure out my problem so why not try a 90 $ pushrod change !

and yeah sorry to mension i have a blower cam in my engine .

94 slow

To the OP,

Where are you located? I'm sure that everyone here can point you in the right direction of a tuner that can figure this out, and get you driving that beast.

NEVERTWOFAST

iTrader: (6)

I had the same problem with my turbo Ta. It was my exhaust not letting enough out. I am open down pipe now . May try open headers !

4SFEDSS

iTrader: (19)

Dont just take a guess and put a .050 shorter push rod in. Check your geometry with the push rod you currently have and if its not optimum use an adjustable push rod to figure out what length you need.

Fb0dy0nly

iTrader: (10)

yeah agreed, an adjustable pushrod checker is like $25, use that first to see what SHOULD be in the engine.

pm2630

best tuner i gnow is jesse bubb warshaw ind #5742673630 cell5745279567 I flew him in couldnt find problem in a day and half so flew him back home and shiped motor eto Lingenfilter where Jessy fixed it manypulls and cams and dyno time If the push rod is to short it will be loose you dont have very mush to play with a hyd lifter GO for .050 it will work paul Oh Jesse was the #4 tuner the main problem was defected mechanic. easy mistake .020 off block .020 off head and .010 thiner gasket and BAM .050 off and it did show up paul

pm2630

matt k will you or someone else tell me how to post it keeps asking for my URL..........
http:// (?) now matt in a little while or tomorrow Ill email you some stuff ,dyno sheet ,pictures and tell you a little about myself Im proud of you for wanting to better yourself and striving to get there. paul

ls1_chevelle

iTrader: (9)

sorry about the wait. This is Pauls dyno where the engine fell flat on its face.

I was talking with Paul via email and he was very certain that the .050 shorter will fix the issue. So much that if it doesn't he will buy the pushrods off you.

-Matt

pm2630

Pauls final dyno sheet on ls9 boat motors,very impressive!!

pm2630

Pauls dyno sheet LS9 early stages testing, take a look and compare to final graph above...