SD Tune Dyno #s
Thread Starter
10 Second Club
iTrader: (4)
Joined: Feb 2004
Posts: 9,448
Likes: 0
From: Marysville, WA
SD Tune Dyno #s Well Bob, it appears you were correct. At least George at Turbo Tech thinks it's the same thing. If 2 of the smartest guys in the business agree, who am I to question it? So I will be ordering some Patriot Gold Ext springs from you soon.
Anyway, after replacing some fouled plugs & trying some things the car made 774.5rwhp & 692.5tq at 14psi @ 6000rpm. We took it up to 7k to prove the point, where it made 16.5psi but only 650hp.
Oh, and it picked up 30hp by removing the air filter.
Anyway, thanks to Bob @ EPP and George @ Turbo Tech for all your help!!!
PS it's a 408 with an F1-C, EPP cam & FMIC, Alky Kit, 4L60E, M9, Nasty Fuel System, 80lb inj's running 20* of timing and it made 704rw with a 1 BAR MAF tune
Mark
Anyway, after replacing some fouled plugs & trying some things the car made 774.5rwhp & 692.5tq at 14psi @ 6000rpm. We took it up to 7k to prove the point, where it made 16.5psi but only 650hp.
Oh, and it picked up 30hp by removing the air filter.
Anyway, thanks to Bob @ EPP and George @ Turbo Tech for all your help!!!
PS it's a 408 with an F1-C, EPP cam & FMIC, Alky Kit, 4L60E, M9, Nasty Fuel System, 80lb inj's running 20* of timing and it made 704rw with a 1 BAR MAF tune
Mark
Thread Starter
10 Second Club
iTrader: (4)
Joined: Feb 2004
Posts: 9,448
Likes: 0
From: Marysville, WA
Indeed, and with George's help we pretty much eliminated everything else - the belt isn't slipping, we removed the air filter & dropped the I-pipe, & the tune is spot on, etc. So the Patriot Gold Ext springs which are desinged for boost (have an extra 100lbs of seat pressure) is most likely the solution.
And it drives pretty good so far. It is a little more finikey (sp?) with SD, adding 10 gal of leaded race gas changed the idle AFR by 1 full point on a cold morning.
And it drives pretty good so far. It is a little more finikey (sp?) with SD, adding 10 gal of leaded race gas changed the idle AFR by 1 full point on a cold morning.
Thread Starter
10 Second Club
iTrader: (4)
Joined: Feb 2004
Posts: 9,448
Likes: 0
From: Marysville, WA
I was wondeirng if that table would help much....haven't played with it yet - PE is at 1.13, that is at 1.0
But I also noticed my MAP goes flat around 8-10psi (155kPa), so all those cells aren't available. I have a new GM 2 BAR MAP (old style).....might need to try a different one & work on those higher cells again after I replace the springs.
But I also noticed my MAP goes flat around 8-10psi (155kPa), so all those cells aren't available. I have a new GM 2 BAR MAP (old style).....might need to try a different one & work on those higher cells again after I replace the springs.
Trending Topics
I was wondeirng if that table would help much....haven't played with it yet - PE is at 1.13, that is at 1.0
But I also noticed my MAP goes flat around 8-10psi (155kPa), so all those cells aren't available. I have a new GM 2 BAR MAP (old style).....might need to try a different one & work on those higher cells again after I replace the springs.
But I also noticed my MAP goes flat around 8-10psi (155kPa), so all those cells aren't available. I have a new GM 2 BAR MAP (old style).....might need to try a different one & work on those higher cells again after I replace the springs.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I know how it works...I was just commenting on your "getting into boost faster" comment.
The pcm uses the richer of the BE and PE table right? PE is by rpm and BE is by boost level.
The Epp cam is a little small for a 408 also, it might be a reason for it peaking a little early also, but it just depends on what your goals are and how much RPM you are wanting to turn with your motor. Over all it looks ok a little more tuning and you will have it. GL!
Thread Starter
10 Second Club
iTrader: (4)
Joined: Feb 2004
Posts: 9,448
Likes: 0
From: Marysville, WA
The EPP cam is too small? (600+ lift & 240+ duration) Damn, I need to get out more. 
Tweaking the BE table might fix one issue. When I'm at part throttle & starting to make boost it goes lean & sputters a little, so raising that would probably be beneficial for launching & road racing & such....
But considering I was planning to set my shift points at 6400, maybe the current setup is just about right (peaks at 6k) for drag racing. It will just nose-over a bit on the top end & not mph the way it could. We'll see.
Tweaking the BE table might fix one issue. When I'm at part throttle & starting to make boost it goes lean & sputters a little, so raising that would probably be beneficial for launching & road racing & such....
But considering I was planning to set my shift points at 6400, maybe the current setup is just about right (peaks at 6k) for drag racing. It will just nose-over a bit on the top end & not mph the way it could. We'll see.
Cam specs are:
Dur @ .050 232 int 240 exh
Lift .595 int .608 exh
Lobe Sep 115.0
Is this the Epp cam you have? I was assuming it was as when most speak of the Epp cam this is the one on there web site and I have used in a few of other peoples builds etc.. I wasn't sure if you were being sarcastic or not cause I don't know you and its the internet lol etc... So I just wanted to clarify it a little so you knew where I was comming from when I said it was a little small for a 408. Nothing bad I was just making a comment. And not telling you how to build your car. But yeah a 232/240 is a little small for a 408 IMO for it will peak at 6-6200. But it will work for sure. I am sure you will get where you want.
Dur @ .050 232 int 240 exh
Lift .595 int .608 exh
Lobe Sep 115.0
Is this the Epp cam you have? I was assuming it was as when most speak of the Epp cam this is the one on there web site and I have used in a few of other peoples builds etc.. I wasn't sure if you were being sarcastic or not cause I don't know you and its the internet lol etc... So I just wanted to clarify it a little so you knew where I was comming from when I said it was a little small for a 408. Nothing bad I was just making a comment. And not telling you how to build your car. But yeah a 232/240 is a little small for a 408 IMO for it will peak at 6-6200. But it will work for sure. I am sure you will get where you want.
Thread Starter
10 Second Club
iTrader: (4)
Joined: Feb 2004
Posts: 9,448
Likes: 0
From: Marysville, WA
Sorry, I keep forgetting how the internet is....I was being sarcastic as usual. And I took no offense. You make intelligent posts, and I appreciate input. 
I have the EPP Stg 2 cam, which is 236/246, 601/613 on a 114. Not a huge cam but bigger than anything I've put in an LS motor. The heads are HOGGED out 6.0Ls so I could probably run a bigger cam, spin it higher & make more power, but it is supposed to be a street car still.
I have the EPP Stg 2 cam, which is 236/246, 601/613 on a 114. Not a huge cam but bigger than anything I've put in an LS motor. The heads are HOGGED out 6.0Ls so I could probably run a bigger cam, spin it higher & make more power, but it is supposed to be a street car still.
Ok thanks for the clarification. Sounds good! I am running a 238/254 in my 346 w/F1R, and had been running a 242/248 cam in the 408 I had in the car and mine are all street cars as well so I was just commenting from what I have tried etc... But it will be a bad *** street car for sure! Keep posted on how the spring change helps you out etc..
