Desktop dyno run please
Thread Starter
Instructor
Joined: Jul 2008
Posts: 133
Likes: 1
From: Denmark
Desktop dyno run please
I will really appreciate if someone can run a desktop dyno for me?
DD2000 cannot be installed on my new Windows 64bit!
I’m building a new engine for my 68 Corvette.
The engine is a 383 stroker with 6" rods, Weiand dual plane intake, Trick
flow 1st gen twisted wedge cyl heads, app. 9.8 to 10.5 CR, full roller rockers, 1
5/8 in full length headers, 2.5 in dual exhaust W/O cats, 5-speed manual transmission, first gear 2.80, rear diff. 3.73 stock dia. tires.
The heads average flow:
Valve lift In Ex
0.10 66 52
0.20 143 109
0.30 187 147
0.40 221 177
0.50 233 194
0.60 237 204
My initial cam choice is a XR276HR with standard ratio rockers on the intake and 1.6 at the exhaust.
But according to CompCams CamQuest6 I will sacrifice 3 hp and gain 11 ftlb with the XR270HR.
If this is correct I will only gain behavior, economy and a better low end torque for the OD trans on main roads without sacrificing performance.
Interesting, but something I would like to double check.
I should add that I don’t have the means of chancing rocker ratios in CamQuest.
Thanks
Lars
DD2000 cannot be installed on my new Windows 64bit!
I’m building a new engine for my 68 Corvette.
The engine is a 383 stroker with 6" rods, Weiand dual plane intake, Trick
flow 1st gen twisted wedge cyl heads, app. 9.8 to 10.5 CR, full roller rockers, 1
5/8 in full length headers, 2.5 in dual exhaust W/O cats, 5-speed manual transmission, first gear 2.80, rear diff. 3.73 stock dia. tires.
The heads average flow:
Valve lift In Ex
0.10 66 52
0.20 143 109
0.30 187 147
0.40 221 177
0.50 233 194
0.60 237 204
My initial cam choice is a XR276HR with standard ratio rockers on the intake and 1.6 at the exhaust.
But according to CompCams CamQuest6 I will sacrifice 3 hp and gain 11 ftlb with the XR270HR.
If this is correct I will only gain behavior, economy and a better low end torque for the OD trans on main roads without sacrificing performance.
Interesting, but something I would like to double check.
I should add that I don’t have the means of chancing rocker ratios in CamQuest.
Thanks
Lars
Thread Starter
Instructor
Joined: Jul 2008
Posts: 133
Likes: 1
From: Denmark
Thanks Weinh
Really appreciate it.
Seems as the benefit of the larger duration is
Noticed that you have a T45 trans. I'm waiting for Keislers outcome of their new T45 with first gear ratio 2.80
I favor the T45 towards the TKO for the smooth shifting.
Are you happy with your box and which ratio are you running at the rear?
Thanks again
Lars
Really appreciate it.
Seems as the benefit of the larger duration is
Noticed that you have a T45 trans. I'm waiting for Keislers outcome of their new T45 with first gear ratio 2.80
I favor the T45 towards the TKO for the smooth shifting.
Are you happy with your box and which ratio are you running at the rear?
Thanks again
Lars
Advanced
Joined: Oct 2007
Posts: 59
Likes: 0
From: Hockenheim
Hi Lars,
all in all I am satisfied with the T45. I have a 3.70 rear which makes a really short total 1st gear ratio, but it is still usable. The 2.8 1st was not available from Keisler when I placed my order, otherwise I would have chosen that for sure.
I think Keisler meanwhile even offers an offset shifter for the T45 which is great news - I still had to cut the shifter opening to a new pattern.
Only thing that irritates me is an erratic grinding/milling noise in 5th gear - I have to follow up on that after the winter break.
Carsten
all in all I am satisfied with the T45. I have a 3.70 rear which makes a really short total 1st gear ratio, but it is still usable. The 2.8 1st was not available from Keisler when I placed my order, otherwise I would have chosen that for sure.
I think Keisler meanwhile even offers an offset shifter for the T45 which is great news - I still had to cut the shifter opening to a new pattern.
Only thing that irritates me is an erratic grinding/milling noise in 5th gear - I have to follow up on that after the winter break.
Carsten
