Dynamometer Results & Comparisons - 408 with a glide. I did something wrong.

Stock Ls1 intake
Stock 78mm truck style throttle body
Stock truck MAF to match
42lb injectors
Aeromotive fuel pump and regulator 58psi.
408ci 9.5 to 1 compression
Dart 225cc Pro 1 heads out of the box.
.625/.625 lift Duration @ .050 254/268 114 LSA Degreed straight up ( no advance or retard)
1 3/4" longtubes
28 degrees of timing

355hp/335torque @ 5700rpm and then DROP!

WHAT THE HELL DID I DO WRONG? :bang:

whats wrong...here is the list:

stock ls1 intake/throttle body
stock maf
compression is low at 9.5
1 3/4 headers

being a 408 that thing needs to breathe. i would start with the intake/tb/maf and re dyno.

Is this through a 9 inch rear, how heavy are your rear wheels? Mustang dyno? i see power glide and those dont rob as much h.p as t350/400.

Whats your expectations with the combo?

bout it is right, everything that is your issue is right there, a 408 with a ls1 intake lol you seeerrriiiooouuusss lol

headers should be 1 7/8, the ls1 intake and tb has to go for a fast setup, and thats just to start

I didnt know the intake and throttle body would really make that much difference.

Hell yeah it makes a huge difference. Like sucking air through a McDonalds straw

Super Victor a
Aarons elbow
LS3 throttle body with xlink
and 1 7/8" headers

Is a hundred horse gain or more in there?

[QUOTE=Bout'ItZ28;16195450]

8.8 w/spool 4:10's 3800 stall
New Weld wheels with 26in. slick
Dynojet
450 plus would have been fine.
Now I want to max out the combo.

Is this through a 9 inch rear, how heavy are your rear wheels? Mustang dyno? i see power glide and those dont rob as much h.p as t350/400.

Whats your expectations with the combo?

The glide ate a lot and your compression is really low for N/A. As said that intake setup needs to go.

Better intake fast??!
Bigger headers 1 7/8s
And the compression is low... Did you have the motor built or buy it.. And was your plan to go NA? Is it me or the lobe separation is to high 114? I'm still learning do if some one can help me.. Drew

If I were you, and this is just my opinion. Ditch the N/A idea. Your compression is low enough and it would make that 408 real happy to see some boost (turbo/SC).

If I were you, and this is just my opinion. Ditch the N/A idea. Your compression is low enough and it would make that 408 real happy to see some boost (turbo/SC).

I totally agree!! Youre gonna spend lot of money for intake/MAF/LID exhaust and better cam. Keep all you have and get boost for the same amount$$ but way better gains!!! LS1 intake will be alright for boost while the FAST can crack under boost, not like the LS1/6 intake. Plus you have low comp.

Right now, all your parts are wrong for a 408 N/A. For exemple, I have a FAST 92 ported, 85MAF and 92mm LID for a mild H/C 347ci and I'm hesitating about going with a 102mm complete setup(MAF, LID, intake, TB). I pulled the trigger on 1 7/8 headers and new Y pipe design though!

I would slap a turbo setup with truck manifold or procharger. dont waste your money.

With 9.5 comp a 400 shot would work all day long!

I totally agree!! Youre gonna spend lot of money for intake/MAF/LID exhaust and better cam. Keep all you have and get boost for the same amount$$ but way better gains!!! LS1 intake will be alright for boost while the FAST can crack under boost, not like the LS1/6 intake. Plus you have low comp.

Right now, all your parts are wrong for a 408 N/A. For exemple, I have a FAST 92 ported, 85MAF and 92mm LID for a mild H/C 347ci and I'm hesitating about going with a 102mm complete setup(MAF, LID, intake, TB). I pulled the trigger on 1 7/8 headers and new Y pipe design though!

I would slap a turbo setup with truck manifold or procharger. dont waste your money.

X2 I think a turbo would work well..

new cam and boost that setup lol.

If not thats crazy cam for the compr and the intake will not flow in the spots the heads and cam are looking to. This setup all over the place. If this was mine i would re cam it get a turbo setup hot and cold parts and boost away. you have a solid base for boost.

with the money you would spend to get a fast and recam and up the compres you would have the same money into a easy turbo setup and make more power. just my .02

Not saying the headers aren't too small, but, I have a set of 1 3/4 stepped to 1 7/8 Edelbrocks what used to be an 11-1cr 418 and it made 469rwhp through a unlocked 80E (521rwhp locked).

Now for the Super Vic (I run one on my 418), I would not run an elbow for a NA set up. I run a 4150 adapter and a Dominator TB. I know that won't fit under an F-body cowl, but a Super Vic with a 4150 might. You will see much better results with out an elbow!

As others have stated, that compression/cam isn't the best combo. That cam should peak way beyond 5,700rpm.

Sure the intake set up could be hurting a bit, but are you sure you are not having valvetrain issues? Even with a LS1 intake I would think it could carry more RPM and make more power.

LS1 intake is a piece is sh*t, will not rev at all with his combo. A 224 cam would make ton more power IMO LOL

lol i agree on the turbo, that huron speed kit or whatever seems like a great kit for the price, comes with hot side,cold side, and all that for 2 gand or something

Not saying the headers aren't too small, but, I have a set of 1 3/4 stepped to 1 7/8 Edelbrocks what used to be an 11-1cr 418 and it made 469rwhp through a unlocked 80E (521rwhp locked).

Now for the Super Vic (I run one on my 418), I would not run an elbow for a NA set up. I run a 4150 adapter and a Dominator TB. I know that won't fit under an F-body cowl, but a Super Vic with a 4150 might. You will see much better results with out an elbow!

As others have stated, that compression/cam isn't the best combo. That cam should peak way beyond 5,700rpm.

Sure the intake set up could be hurting a bit, but are you sure you are not having valvetrain issues? Even with a LS1 intake I would think it could carry more RPM and make more power.

i went 10.90's with a stock cube 6.0L, l92 heads, 240's camshaft, GMPP l92 intake and a edelbrock ultra low profile elbow, 90mm tb connected to a slp air lid. 3820lb 6 speed car.....

but I do agree a Victor jr or super victor would be more at home on this. my point is dont rule out running a elbow if your worried about hood clearance and air filtration.

you dynoed on slicks, slicks grow, this will throw your numbers, i lost 40 rwhp when they grew on the dyno!!

^^^^ Dyno #'s should only be used as a tunning tool and that's it!! My Camaro has a LS2 402ci with a th350, full suspension and a 12bolt rearend and my car went 10.39@129mph weighing in at 3540lbs with me in it. What was said on page one was correct though. Either go FI or you need a better intake and more compression. I don't have the best intake on my motor either (ported Fast 90mm and TB) but we leaned on the cam a little more to help reach my goals..

Looks to me that the LSA is a little too large for a short runner (vic jr, super vic) intake. Youd be better of with at Least a ported LS6 or heavily ported LS2 intake and 90mm TB. Look up fasterproms and see if jeremy can help you find an intake for your setup. Compression is your biggest weak point in this combo n/A.

With that monster cam and stock intake, i'm surprised it even made that much power.

Not saying the headers aren't too small, but, I have a set of 1 3/4 stepped to 1 7/8 Edelbrocks what used to be an 11-1cr 418 and it made 469rwhp through a unlocked 80E (521rwhp locked).

Now for the Super Vic (I run one on my 418), I would not run an elbow for a NA set up. I run a 4150 adapter and a Dominator TB. I know that won't fit under an F-body cowl, but a Super Vic with a 4150 might. You will see much better results with out an elbow!

As others have stated, that compression/cam isn't the best combo. That cam should peak way beyond 5,700rpm.

Sure the intake set up could be hurting a bit, but are you sure you are not having valvetrain issues? Even with a LS1 intake I would think it could carry more RPM and make more power.i agree,even with the intake and headers it should have made more power and peaked higher.not saying it doesn't need a better intake and headers,but it should still put more than 355hp to the wheels.and IMO,that cam is wat too big,especially for 9.5-1 CR.

I think add the nitrous and a fast 102 with a 90mm throttle body will help alot.

I was in hopes of a 450hp+ base to spray a progressive 400shot on.

I will swap the intake, throttle body and maybe the maf. (the maf should flow 800cfm, even the throttle body is 78mm should flow 750cfm)

The build is intended for big spray or boost, but i still thought the dyno numbers were low.

Come to find out I also might need to correct the fuel injector data table in the tune. Funky Delphi injectors have given other tuners a little trouble.

I cant wait to bolt on a D1!

Thanks for all the input.

The ls1 intake is beyond killing you but I bet you have some other hardware issue if it only revs to 5700rpm.

Likely valve float is occuring

BES Stroked Nova,

I am just saying to make the most power with a Vic set up (super or not) an elbow holds it back.