WTF! Car wont make boost on dyno..
FWIW dept.... The airflow calcs I've made for your application, result in an airflow requirement of 1391CFM.
I used:
CI=366
RPM=6500
Boost=15psi
I'm not aware of the filter combo you are using, but could it be that you have the same problem I had w/ my Turbo Buick....Not enough airflow capacity in the filter?
The gauze filter industry uses a std set of calcs to determine filter flow, and engine air requirenents.
If you know the size of the filter, you can calculate it's flow. From there, you can deternine what's needed...
IE:
My BUICK was set up w/ a 6x9 cone filter by K&N.
I was experiencing poor accel rate on the engine, and thus poor dyno results.
I did the math, and found I needed 2 filters to get the CFM up to required flow... Once done, the engine put out 850FWHP/840#.
I used:
CI=366
RPM=6500
Boost=15psi
I'm not aware of the filter combo you are using, but could it be that you have the same problem I had w/ my Turbo Buick....Not enough airflow capacity in the filter?
The gauze filter industry uses a std set of calcs to determine filter flow, and engine air requirenents.
If you know the size of the filter, you can calculate it's flow. From there, you can deternine what's needed...
IE:
My BUICK was set up w/ a 6x9 cone filter by K&N.
I was experiencing poor accel rate on the engine, and thus poor dyno results.
I did the math, and found I needed 2 filters to get the CFM up to required flow... Once done, the engine put out 850FWHP/840#.
i replaced the filter with a larger one, but i'm pretty sure i made as high as 852 with the original one
http://www.fastrides.com/photos/mm/i.../original.aspx
http://www.fastrides.com/photos/mm/i.../original.aspx
9 Second Club
Joined: Feb 2002
Posts: 985
Likes: 7
From: Lake Orion, MI
Yep, the stock one had no problems going 9.98s at 140.1mph at 15psi Innovative 80. No collapse or distortion going on yet, but I can see stepping it up over the 850hp mark to remove the potential restriction.
What filter do you have on there now David?
Rick
What filter do you have on there now David?
Rick
hmm good question, i think its 12'' long and the same starting and ending diameter as the original, dont remember the part number. but looked on there website and i figure it is RE-0860
Everyone is forgetting one important thing.. Altitude.. We are up here at 6,000 feet above sealevel, even worse is the DA in the area is usually 8000 feet..
Mecham (earnest) is the only guy I know of that has a turbo car pushing these kind of numbers. It's very possible that the turbo just can't make any more boost. I know it's hard to believe a single T80 can't keep up. But what is the max impeller speed of the T80? At what RPM does it hit this speed? DO turbos just keep making boost or could they run out of air. At these high speeds what is the efficenty factor of the unit?
If there are no boost leaks or exhaust leaks, I would look into a CFM intake problem. Just on the dyno try to have the turbo suck in raw air, just a thought. If you do make more boost then look into getting a dual filtration system like suggested above..
Keep me posted Earnest.. I know what your goals are, I know you will hit them, but you might need to do just a few more things.
Clint
Mecham (earnest) is the only guy I know of that has a turbo car pushing these kind of numbers. It's very possible that the turbo just can't make any more boost. I know it's hard to believe a single T80 can't keep up. But what is the max impeller speed of the T80? At what RPM does it hit this speed? DO turbos just keep making boost or could they run out of air. At these high speeds what is the efficenty factor of the unit?
If there are no boost leaks or exhaust leaks, I would look into a CFM intake problem. Just on the dyno try to have the turbo suck in raw air, just a thought. If you do make more boost then look into getting a dual filtration system like suggested above..
Keep me posted Earnest.. I know what your goals are, I know you will hit them, but you might need to do just a few more things.
Clint
