LS6 vs FAST 90mm on a FMS 434 motor
05-25-2004, 12:12 AM
#1
LS6 vs FAST 90mm on a FMS 434 motor Finished up an upgrade to a customers solid roller 434 motor. Switched to a Darton wet-sleeve block, lowered the CR .5 pt, swapped from 5.3 heads to FMS-LS6 RACE heads and installed slightly more aggressive cam profile 259\266-112 (.672"\.673")-yes solid again.
Last dyno was at TR 2 yrs ago and made 550\508 open headers, short belt on same drivetrain,and dynoed 539\514 before teardown through cutout. New setup made 584\535 with LS6 intake and ported T\B, then dynoed with the FAST 90mm intake 605\544
The FAST 90mm intake was port matched, installed and dynoed with NO TUNING changes, the dip at low RPM is a lean tip-in, then the A\F went right to 13.0 (same A\F as the LS6 intake), needless to say the customer was happy after the 21 HP gain
and will be getting one soon. Also had a little RPM signal loss at the beginning of the pulls.
Dynoed through 12-bolt w\4.10, stock driveshaft, short belt, open cutout after Y-pipe, no air filter and on stock WS6 rims w\275\40-17 DR's with 103\93 mix gas.
Last dyno was at TR 2 yrs ago and made 550\508 open headers, short belt on same drivetrain,and dynoed 539\514 before teardown through cutout. New setup made 584\535 with LS6 intake and ported T\B, then dynoed with the FAST 90mm intake 605\544
The FAST 90mm intake was port matched, installed and dynoed with NO TUNING changes, the dip at low RPM is a lean tip-in, then the A\F went right to 13.0 (same A\F as the LS6 intake), needless to say the customer was happy after the 21 HP gain
and will be getting one soon. Also had a little RPM signal loss at the beginning of the pulls. Dynoed through 12-bolt w\4.10, stock driveshaft, short belt, open cutout after Y-pipe, no air filter and on stock WS6 rims w\275\40-17 DR's with 103\93 mix gas.
Last edited by Futral Motorsports; 05-25-2004 at 01:45 PM.
05-25-2004, 01:25 AM
#3
TECH Addict
Join Date: Jan 2002
Location: Magee MS
Posts: 2,950
Likes: 0
Received 0 Likes
on
0 Posts
Wow I can't wait to see that booger on the track again!!!! I though he decided to go with a C5R this time. Those are great numbers! I might have to give you guys a call sometime soon and check up on a 408.
Josh S.
Josh S.
That is one BAD *** setup!!! I've got to have a sick *** solid roller soon 
Trending Topics
05-25-2004, 10:50 AM
#12
I can shift faster than you.
iTrader: (21)
Join Date: Nov 2001
Location: Baton Rouge, LA
Posts: 5,133
Likes: 0
Received 0 Likes
on
0 Posts
Damn good numbers, especially through a 12-bolt/4:10s and a cutout! Just imagine what it would have done with open headers and a more aggressive tune. 
I don't know too many places (if any) that have two LS1/LS6 600rwhp n/a cars sitting in the shop at one time (this car and Gordon's). That was pretty cool to see.
Jason
I don't know too many places (if any) that have two LS1/LS6 600rwhp n/a cars sitting in the shop at one time (this car and Gordon's). That was pretty cool to see.
Jason
05-25-2004, 12:58 PM
#13
Originally Posted by Mike K.
Damn thats awesome, Thanks for the comparison. Maybe I do need a Fast 90mm intake. What type of TB was used?
Originally Posted by VINCE
It Must Be Nice!!!! This is an AWESOME comparison. Both with the swap of heads and intake. FMS never cease to amaze me.. What kills me is this car was tuned with ls1edit.
Originally Posted by gomer
Man, I actually got "excited" after reading that That is one BAD *** setup!!! I've got to have a sick *** solid roller soon
Originally Posted by mikey
Thanks alot Allan. My FAST goes on shortly. Did you port either manifold?
.....must....get..money....
05-25-2004, 03:53 PM
#16
TECH Fanatic
iTrader: (1)
Join Date: May 2002
Location: Hot Rainy Humid +2000 DA South Florida
Posts: 1,396
Likes: 0
Received 1 Like
on
1 Post
OMG!
605\544 NAThats what I'm talkin about!
I know there was alot of ppl waiting to see the #'s of the 90mm intake and TB on a big cube motor. Awesome job Alan!!
Lee
