Disappointed - Need other thoughts
11-20-2012, 11:04 AM
#1
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Disappointed - Need other thoughts Initial - LS6 intake, stock cam, stock heads, upgraded FAST 36 (41+lb) injectors, T56, lid, cat-back... 354/367
DYNOJET 248X ---
Now - GMPP intake, Aarons elbow w/stock TB, 317 cast CNC'd heads, Lunati 55008 (.600/.601,238/242,112+4LSA), FAST 36s, TH400, lid, 1 3/4"LTs... 384/322???
DYNOJET 224 ---
I didn't get a AFR w/the dyne this time, but my narrow band said rich and the guys agreed it seemed so. Obviously more tuning is needed, but what about the HP curve seeming 70 or so short along the same RPM points? Also, I used to run out of HP at about 5500, now it keeps climbing to 7K...
Thanks,
D
DYNOJET 248X ---
Now - GMPP intake, Aarons elbow w/stock TB, 317 cast CNC'd heads, Lunati 55008 (.600/.601,238/242,112+4LSA), FAST 36s, TH400, lid, 1 3/4"LTs... 384/322???
DYNOJET 224 ---
I didn't get a AFR w/the dyne this time, but my narrow band said rich and the guys agreed it seemed so. Obviously more tuning is needed, but what about the HP curve seeming 70 or so short along the same RPM points? Also, I used to run out of HP at about 5500, now it keeps climbing to 7K...
Thanks,
D
11-20-2012, 11:11 AM
#2
Why disappointed? The TH400 swap cost you a **** ton of power for sure, the 317 heads are lower compression unless they have been milled to hell, and it looks like the graph was still climbing when the pull ended (which seems a little odd to me considering the cam is a 112+4...I would expect it to peak earlier). Not familiar with the GMPP intake but if it's a single plane that will also cost under the curve power over a dual plane or plastic type intake.
Is there a chance the cam might be installed with retard?
Is there a chance the cam might be installed with retard?
11-20-2012, 11:20 AM
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Heads milled a tad but don't have the specs. Cam is straight up installed and forgot to add TCI Street-fighter torque converter that starts pushing the front end (w/wheels locked) about 2450 rpm). GMPP is a single plane. I think the stock throttle and elbow are choking it out.
Closest 1/4 mile track is about 4 hours away
11-20-2012, 11:58 AM
#6
How tight is the turn on the elbow? Some of those low profile elbows are reported to cost a lot of HP. A stock size tb is probably costing a little upper end power too.
Trying to compare a T56 car with a factory type intake to a th400/TCI brand stall car with a single plane is going to be comparing apples to hot dogs. They don't even belong in the same section of the store.
Not sure what you are going for with the setup, but a single plane intake and huge cam and lower compression heads combined with a low stall converter sounds like a fairly mismatched combo to me, but I might be wrong.
Trying to compare a T56 car with a factory type intake to a th400/TCI brand stall car with a single plane is going to be comparing apples to hot dogs. They don't even belong in the same section of the store.
Not sure what you are going for with the setup, but a single plane intake and huge cam and lower compression heads combined with a low stall converter sounds like a fairly mismatched combo to me, but I might be wrong.
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11-20-2012, 03:04 PM
#8
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TCI 241002 Super Street-fighter is the TC - Says 3500-3800 stall speed... Designed for rough idle cams
Lunati 55008 Spec'd at .595/.595 (mic'd at .600/.601) - 3000-6500 rpm band, 298/301 duration.
The elbow is fairly sharp w/the bend but I doubt thats as detrimental as the stock throttle. Thats one of my next changes.
Apples and hot dogs huh?
I'm still trying to find a good description as to what 'locking up' of the TC is. One thing I did is to disconnect my kick-down when I did the dyno (pulled switch for electric kick-down on throttle). Had good new spark plugs, fresh oil and tried for good gas (91 octane).
Again, I'm going to have to get it tuned better but with the hp drop clear between the two at comparable rpm ranges, would the TH400 account for that? I thought autos lost about 22% and sticks about 16-18%?
My goal is consistent drag strip results. I loved the T56, but missing the shift or floating clutch pedals got on my nerves.
Thanks again!
D
Lunati 55008 Spec'd at .595/.595 (mic'd at .600/.601) - 3000-6500 rpm band, 298/301 duration.
The elbow is fairly sharp w/the bend but I doubt thats as detrimental as the stock throttle. Thats one of my next changes.
Apples and hot dogs huh?
I'm still trying to find a good description as to what 'locking up' of the TC is. One thing I did is to disconnect my kick-down when I did the dyno (pulled switch for electric kick-down on throttle). Had good new spark plugs, fresh oil and tried for good gas (91 octane). Again, I'm going to have to get it tuned better but with the hp drop clear between the two at comparable rpm ranges, would the TH400 account for that? I thought autos lost about 22% and sticks about 16-18%?
My goal is consistent drag strip results. I loved the T56, but missing the shift or floating clutch pedals got on my nerves.
Thanks again!
D
11-21-2012, 05:30 PM
#12
I dont see why you are disappointed when you lost compression and went to a much heavier drivetrain. 400s don't have lock up as they are a 3 speed transmission. I have seen a manual car lose 60rwhp when going to a big converter 400 tranny. Just because it doesn't dyno well doesn't mean it doesn't do well. Run the car at a track and see how it does.
11-21-2012, 06:48 PM
#13
Yeah i dont get it,it feels faster now but your disappointed,your numbers are not going to be all that well with that setup,but i guarantee your 1/4 times will be much much better than previous, dyno numbers dont mean anything especially on that kind of setup,like what has been said the 400 will drain your dyno number,but the only number that counts is at the track,i have seen car make 100 or more less hp on the dyno but totally destroy me on the street/track,if your wanting to build a fast car i think losing the t56 was a smart move,dont start 2nd guessing untill ya get track times,and if your still unhappy add some boost lol
11-21-2012, 10:07 PM
#15
Since no one has pointed it out.
Your first dyno sheet is STD, and the second is SAE. The first sheet would have been at least 5hp lower, maybe even 10hp.
Seen guys post STD numbers on here so they can say they made just over 600rwhp or what ever. I always ask for the files to my email when I go to the dyno. If it is a dynojet, you can go to dynojets website and download the Winpep software, then you can look at the information any way you like. That is why I know the what the difference between STD vs SAE are. It is a simple click of a mouse. My last pulls that were in the mid 500s, gained over 15hp going from SAE to STD. So if someone is running around toting they made just over 500, 600 or what ever, if it is STD, they are full of crap. They made less.
Anyway, you gained a bit more than you think.
Your first dyno sheet is STD, and the second is SAE. The first sheet would have been at least 5hp lower, maybe even 10hp.
Seen guys post STD numbers on here so they can say they made just over 600rwhp or what ever. I always ask for the files to my email when I go to the dyno. If it is a dynojet, you can go to dynojets website and download the Winpep software, then you can look at the information any way you like. That is why I know the what the difference between STD vs SAE are. It is a simple click of a mouse. My last pulls that were in the mid 500s, gained over 15hp going from SAE to STD. So if someone is running around toting they made just over 500, 600 or what ever, if it is STD, they are full of crap. They made less.
Anyway, you gained a bit more than you think.
11-21-2012, 10:10 PM
#16
How tight is the turn on the elbow? Some of those low profile elbows are reported to cost a lot of HP. A stock size tb is probably costing a little upper end power too.
Trying to compare a T56 car with a factory type intake to a th400/TCI brand stall car with a single plane is going to be comparing apples to hot dogs. They don't even belong in the same section of the store.
Not sure what you are going for with the setup, but a single plane intake and huge cam and lower compression heads combined with a low stall converter sounds like a fairly mismatched combo to me, but I might be wrong.
Trying to compare a T56 car with a factory type intake to a th400/TCI brand stall car with a single plane is going to be comparing apples to hot dogs. They don't even belong in the same section of the store.
Not sure what you are going for with the setup, but a single plane intake and huge cam and lower compression heads combined with a low stall converter sounds like a fairly mismatched combo to me, but I might be wrong.
