LT1-LT4 Modifications 1993-97 Gen II Small Block V8

What will I dyno and run?

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Old Apr 15, 2006 | 02:41 PM
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Default What will I dyno and run?

I hate these type of threads as most do but I had to ask. Here are all my mods:

-Engine-
Eagle 4340 383 stroker kit
SRP 5 cc pistons
Upgraded oil pump
Vented Optispark conversion (Dynaspark)
Cloyes Double Roller Timing chain
LT4 ported intake manifold
ATI crank pulley
Moroso deep sump oil pan
Meziere electric water Pump
PCM4Less tune
AFR 190 Lloyd Elliot port and polished 217cc heads
Lloyd Elliot / Bret Bauer custom cam
Comp 977 dbl springs and Ti retainers
Crane energizer series non slef aligning Rocker arms
AFR guide plate
AFR one peice chrome moly pushrods
Racetronix 37lbs injectors
Racetronix fuel pump with harness
Taylor spark plug wires
Hypertech 160 thermostat
BBK 58mm Throtle Body
Moroso Cold air intake
MSD 6AL ignition
MSD blaster coil
4 bolt block
NGK Plugs
LT1 Scanmaster
PLX A/F ratio gauge
LT4 KM in the mail
The static CR is 12.23:1, with 5 cc pistons, a 0.039" gasket and assuming 55 cc chambers on the resurfaced AFR heads.
The IVC at 74 deg ABDC so that should put the DCR at 9.01:1

-Suspension-
BMR relocation brackets
LS1 brake upgrade
BMR Adjustable lower control arms
BMR adjustable panhard bar
BMR Sub frame connectors
BMR Shock tower brace
C/E Adjustable Rear Drag Shocks
Poly Torque arm mount

-Drivetrain-
Pro Built race rebuild kit
Sonnax intermediate servo
Superior / Fairbanks Maximum Overdrive Servo
Transgo shift kit
3500 Yank torque converter
4.10 gears
B&M supercooler w/fan
Trans temp gauge

-Rims and Tires-
Chrome ZR1 rims 17X11 rear 17X9.5 front
BFG drag radials 315/35/17

So with these mods what do you think she will make on the dyno and run in the 1/4? This a 1994 Z-28 A4 convertible BTW.
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Old Apr 15, 2006 | 05:42 PM
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My combination is similar. You have a few more goodies though. With a good tune maybe 380 to 410 rwp on the dyno. Actual output will probably be more but I'm learning that a dyno does not like autos with loose converters. On a good day with good traction probably around 12.4s in the 1/4 mile. Less as time goes on and you start to tweek your combination. Good luck!

Mec
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Old Apr 15, 2006 | 11:26 PM
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Yeah. Ive noticed the dyno is unforgiving to auto Camaros. I'm sure it's because most people dont stay in 3rd and lock the converter.
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Old Apr 15, 2006 | 11:30 PM
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Well you didn't list cam specs AFAIK and that will make a HUGE difference on what you dyno...

I had way less stuff than that when i did my 355 LT1 and it ran 11.62@119 on motor with a T56.... on motor....

and dynoed 422RWHP/405RWTQ..... you should make at least in that neighborhood if your tune is good and your cam isn't wimpy... good luck...
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Old Apr 15, 2006 | 11:35 PM
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Here are more specs:

Cam:
23x/23x 10x lsa

Head flow#
.2 138/107
.3 194/143
.4 242/178
.5 274/199
.6 285/211
.650 288/214



Originally Posted by OutlawZ
Well you didn't list cam specs AFAIK and that will make a HUGE difference on what you dyno...

I had way less stuff than that when i did my 355 LT1 and it ran 11.62@119 on motor with a T56.... on motor....

and dynoed 422RWHP/405RWTQ..... you should make at least in that neighborhood if your tune is good and your cam isn't wimpy... good luck...
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Old Apr 16, 2006 | 07:34 AM
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Anything over 400 unlocked is gravy..with that combo....
You have everything needed to get 420-440 easy (especially with a stock rear and good converter)!

My combo works very well.....
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Old Apr 16, 2006 | 10:24 AM
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Originally Posted by jimbob
Anything over 400 unlocked is gravy..with that combo....
You have everything needed to get 420-440 easy (especially with a stock rear and good converter)!

My combo works very well.....
Where is Speed Secrets and could you tell us more about your intake? You have a pretty unique combo there.
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Old Apr 16, 2006 | 10:50 AM
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Monroe Washington....
Twofast4lv is the owner...

The manifold is basically just an LT4 with welding above the injector bosses (so you can port and raise the intake port maybe 1/4 inch...). We cut the intake top off, ported the inside, and raised the top about 2 inches. Got rid of that damn cross over tube bump in the process...we use a fuel line welded from one side of the fule rail to the other...

I can't find any good pictures of the manifold, but in this video you can see it a little....
http://video.ls1tech.com/search/lt1/...3F6A98F0D3.htm
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Old Apr 16, 2006 | 11:03 AM
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Originally Posted by jimbob
Monroe Washington....
Twofast4lv is the owner...

The manifold is basically just an LT4 with welding above the injector bosses (so you can port and raise the intake port maybe 1/4 inch...). We cut the intake top off, ported the inside, and raised the top about 2 inches. Got rid of that damn cross over tube bump in the process...we use a fuel line welded from one side of the fule rail to the other...

I can't find any good pictures of the manifold, but in this video you can see it a little....
http://video.ls1tech.com/search/lt1/...3F6A98F0D3.htm
That was great. Very nice numbers youre making.
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Old Apr 16, 2006 | 10:23 PM
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yeah with those flow #'s and a good tune you should be making 430-440ish....

probably 11.50's with the right launch and tire/gearing setup right....maybe faster depending on you..

I had a slighter bigger cam 236/242 .556/.576 112lsa..... big cam for a lil 355... and your heads flowed way better than mine.... 258cfm peak on my Stage II heads..... but then we can get into the velocity discussion again... but based on what you've told me i'd say again 430+....
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Old Apr 17, 2006 | 01:20 AM
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Awesome. Thanks for the advise. Should be on the dyno soon after this tranny is done being built.
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Old Apr 17, 2006 | 03:05 AM
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Originally Posted by Honda Hunter
That was great. Very nice numbers youre making.
I think there's another 15-20 in the air intake (forward of t-body), with maf deleted and something along a ls1 line, lid and lower section. I would think that on a stock 10 bolt with manual 480-490 is possible now, if I can find just a little more with those air intake mods.......
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Old Apr 17, 2006 | 05:25 AM
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Originally Posted by Greaseymec
My combination is similar. You have a few more goodies though. With a good tune maybe 380 to 410 rwp on the dyno. Actual output will probably be more but I'm learning that a dyno does not like autos with loose converters. On a good day with good traction probably around 12.4s in the 1/4 mile. Less as time goes on and you start to tweek your combination. Good luck!

Mec
Dude, cam only, stock bottom end LT1's are doing that. If I did all that and I only ran a 12.4 I would shoot myself
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