Thunder Racing 427CI LS6/TH400 Chassis Dyno Results
07-27-2009, 07:04 PM
#1
FormerVendor
Thread Starter
iTrader: (2)
Join Date: Dec 2001
Location: Baton Rouge, LA, USA
Posts: 1,954
Likes: 0
Received 3 Likes
on
3 Posts
Thunder Racing 427CI LS6/TH400 Chassis Dyno Results Well, after fighting this particular combo for the last few weeks (and getting very discouraged!!!) it looks like our R & D finally paid off and we've got this this thing sorted out. The combo is as follows:
98 F-Body
TR 427 LS7 Forged Shortblock (Callies internals)
ETP 245cc LS6 hand massaged by Craig Gallant @ GTP
12.5:1 compression (we have 2 tunes, 1 for race gas, 1 for pump)
Custom 1.250" double valvespring and retainer combo (crazy spring pressure so please don't ask)
T&D 1.7 shaft mount rockers
Comp "R" lifters
TR 25x/26x hydraulic roller .6xx"/.6xx" on an LSA that no one believes would work.
TR Ported FAST 92 w/NW92 TB
Moroso Pan and pickup
American Racing 1 7/8" to 2" stepped headers with 3 1/2" collectors (no extensions for these pulls)
Custom built TH400
Custom built PTC 5000 stall converter (Thanks Lane!)
Moser 9" w/4.30 gears
SD tune by Geoff @ EPS
All pulls were made with C-12 fuel and on 28"X10.5" ET Drags on a Dynojet 224xLC
First pull 581 RWHP SAE
Final pull 587 RWHP SAE
I'll post graphs tomorrow...
Car is headed for the track on Wed (weather permitting.) The pulls today were made during a nasty thunderstorm. I feel like the car could push 600 on a good day.
I just thought I would share, we are pretty stoked because this has been one of those projects that nothing seemed to go right on.
Many thanks to Comp Cams, Craig Gallant at GTP, Lane at PTC and Geoff Skinner at Engine Power Systems. Also thanks to Kenny Brennigar for building a killer TH400.
The tradition of real world R&D continues here at Thunder just like it always has since 1995.
Thanks,
Shane
98 F-Body
TR 427 LS7 Forged Shortblock (Callies internals)
ETP 245cc LS6 hand massaged by Craig Gallant @ GTP
12.5:1 compression (we have 2 tunes, 1 for race gas, 1 for pump)
Custom 1.250" double valvespring and retainer combo (crazy spring pressure so please don't ask)
T&D 1.7 shaft mount rockers
Comp "R" lifters
TR 25x/26x hydraulic roller .6xx"/.6xx" on an LSA that no one believes would work.
TR Ported FAST 92 w/NW92 TB
Moroso Pan and pickup
American Racing 1 7/8" to 2" stepped headers with 3 1/2" collectors (no extensions for these pulls)
Custom built TH400
Custom built PTC 5000 stall converter (Thanks Lane!)
Moser 9" w/4.30 gears
SD tune by Geoff @ EPS
All pulls were made with C-12 fuel and on 28"X10.5" ET Drags on a Dynojet 224xLC
First pull 581 RWHP SAE
Final pull 587 RWHP SAE
I'll post graphs tomorrow...
Car is headed for the track on Wed (weather permitting.) The pulls today were made during a nasty thunderstorm. I feel like the car could push 600 on a good day.
I just thought I would share, we are pretty stoked because this has been one of those projects that nothing seemed to go right on.
Many thanks to Comp Cams, Craig Gallant at GTP, Lane at PTC and Geoff Skinner at Engine Power Systems. Also thanks to Kenny Brennigar for building a killer TH400.
The tradition of real world R&D continues here at Thunder just like it always has since 1995.
Thanks,
Shane
Last edited by XtraCajunSS; 07-27-2009 at 08:23 PM.
07-27-2009, 07:34 PM
#5
Trending Topics
those are great numbers. I want to see a video on the dyno run and some track vids.
07-27-2009, 08:51 PM
#9
FormerVendor
Thread Starter
iTrader: (2)
Join Date: Dec 2001
Location: Baton Rouge, LA, USA
Posts: 1,954
Likes: 0
Received 3 Likes
on
3 Posts
Well, after 2 cam swaps, one lifter change, 2 torque converters, having the trans checked over and many, many dyno and track tests... I am frick'n relieved! The car initially made 513 on pump gas with a much different camshaft. I was happy but the car didn't run well after the 1/8 mile so we knew something was off somewhere. We stuck with it and things finally came together. The owner is very happy and can't wait to get back to the track. The car is a pig so I am hoping for 9.8x's and high 130's to back up the numbers.
Thanks again for all the comments.
Shane
Thanks again for all the comments.
Shane
07-27-2009, 08:56 PM
#10
Outstanding numbers, especially considering the very un-dyno-friendly driveline. Well done for all those involved. 
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
07-28-2009, 10:29 AM
#12
FormerVendor
Thread Starter
iTrader: (2)
Join Date: Dec 2001
Location: Baton Rouge, LA, USA
Posts: 1,954
Likes: 0
Received 3 Likes
on
3 Posts
Unfortunately, I have to keep the cam specs and spring/valve combo off of the internet for now. There are a more than a few reasons why none of our new cam designs are on the website. I prefer to discuss the plusses and minuses of each design with every customer who calls. Many of the cams we sell now are custom ground for each customer and are backed up by years of R&D and experience. All of the cams on our website now (some of which were designed in the late 90's, years before many shops even opened their doors) are proven performers and seem have stood the test of time very well but we are doing more and more custom stuff to suit each customers needs.
In the case of this combo, I will tell you that the valves are not titainium and the springs are commercially available although they have never been used in this type of application (that I know of
) The retainers are custom machined to fit this tiny double spring. For a customer who is interested in turning a lot of RPM with an aggresive hydraulic cam and a BIG heavy set of valves it seems to work well. Valve sizes are 2.16+/1.5x with very long stems.
Thanks,
Shane
In the case of this combo, I will tell you that the valves are not titainium and the springs are commercially available although they have never been used in this type of application (that I know of
) The retainers are custom machined to fit this tiny double spring. For a customer who is interested in turning a lot of RPM with an aggresive hydraulic cam and a BIG heavy set of valves it seems to work well. Valve sizes are 2.16+/1.5x with very long stems.Thanks,
Shane
Last edited by XtraCajunSS; 07-28-2009 at 10:34 AM.
:
