Dyno tune first 3 pulls
Thread Starter
Race Director
Joined: Feb 2001
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Dyno tune first 3 pulls
HI,
Just got back from the tuner. The red line is the first pull with the Mail order tune and the 3rd pull is where the car is now after changing a few things. He will continue tuning monday... I should be making around 400 to 410rwhp. He said I would make more power if I had 3inch exhaust all the way back.
SDPC 383 short block
GM 847 cam
SDPC Stage III heads (LPE machines the heads for SDPC)
LPE LT4 manilfold.
58mm TB
EM long tubes
PowerEffects
Just got back from the tuner. The red line is the first pull with the Mail order tune and the 3rd pull is where the car is now after changing a few things. He will continue tuning monday... I should be making around 400 to 410rwhp. He said I would make more power if I had 3inch exhaust all the way back.
SDPC 383 short block
GM 847 cam
SDPC Stage III heads (LPE machines the heads for SDPC)
LPE LT4 manilfold.
58mm TB
EM long tubes
PowerEffects
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Wow very nice gain; looks like about a 10% boost from tuning.
I tend to agree that with about 470-490chp you should be running 3" true duals. You need about 2.2cfm/chp or about 1,100cfm in your case. A 2 1/2" pipe can flow about 560cfm or 1,100cfm with duals. Which would would put you just about at the limit of a set of 2 1/2" duals.
I tend to agree that with about 470-490chp you should be running 3" true duals. You need about 2.2cfm/chp or about 1,100cfm in your case. A 2 1/2" pipe can flow about 560cfm or 1,100cfm with duals. Which would would put you just about at the limit of a set of 2 1/2" duals.
Pro
Joined: Sep 2000
Posts: 599
Likes: 0
From: Tampa,FL
Nice numbers! Congrats on the results. I would look into the exhaust a little deeper. dual 2.5s are sufficient for 500CHP so I would go dual 2.75 max unless you plan on doing more for HP. Keep in mind it's good to have little back pressure...little being key word. Only certain cam profiles warrant NO back pressure at all and I am uncertain of yours. Good luck 
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Nice torque bump there on the chart. Do you have an X-pipe on the car right now?
That first run it was definitely running lean, over 14 all the way. Some here might comment that you can go way richer but John doesn't seem to take it beyond the low 13s. Difference of opinion. And then he backs up the data log by pulling a plug and reading it. If you get a chance, can you ask John which side of the engine is # 1 and # 2 on the chart? I have the same divergence between the two and think my driver side is richer.
I saved the jpgs and hit them with some gamma correction. It brings out the lines a lot better.
That first run it was definitely running lean, over 14 all the way. Some here might comment that you can go way richer but John doesn't seem to take it beyond the low 13s. Difference of opinion. And then he backs up the data log by pulling a plug and reading it. If you get a chance, can you ask John which side of the engine is # 1 and # 2 on the chart? I have the same divergence between the two and think my driver side is richer.
I saved the jpgs and hit them with some gamma correction. It brings out the lines a lot better.
Drifting
Joined: Nov 2000
Posts: 1,276
Likes: 0
From: Ft. Worth Texas
St. Jude Donor '11
Originally Posted by SurfnSun
The Power Effects are 2 3/4. Im running the same ones on my car. I agree tho...its time to upgrade. I need to as well.
jeff
Thread Starter
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by 65Z01
Wow very nice gain; looks like about a 10% boost from tuning.
I tend to agree that with about 470-490chp you should be running 3" true duals. You need about 2.2cfm/chp or about 1,100cfm in your case. A 2 1/2" pipe can flow about 560cfm or 1,100cfm with duals. Which would would put you just about at the limit of a set of 2 1/2" duals.
I tend to agree that with about 470-490chp you should be running 3" true duals. You need about 2.2cfm/chp or about 1,100cfm in your case. A 2 1/2" pipe can flow about 560cfm or 1,100cfm with duals. Which would would put you just about at the limit of a set of 2 1/2" duals.
The mail order tune wasn't working at all for my car. I had problems keeping the car running. If I stoped at a stop light I would have to keep my foot on the gas to keep the car from stalling. Now after john looked at it she runs and sounds good... I went by the shop today and he thinks I should see around 420rwhp with 3inch exhaust all the way back. the mail order tuner said there had to be something mechanically wrong.
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Thread Starter
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Joined: Feb 2001
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by SurfnSun
The Power Effects are 2 3/4. Im running the same ones on my car. I agree tho...its time to upgrade. I need to as well.
I'm going to use the power effects mufflers but cut out all the 2 3/4 pipe....
Thread Starter
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by jerkyboy
Nice numbers. I take it John is back on his feet?
Thread Starter
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by ~db~
Nice numbers! Congrats on the results. I would look into the exhaust a little deeper. dual 2.5s are sufficient for 500CHP so I would go dual 2.75 max unless you plan on doing more for HP. Keep in mind it's good to have little back pressure...little being key word. Only certain cam profiles warrant NO back pressure at all and I am uncertain of yours. Good luck
Thanks... I'm going to take John's advice and go 3inch all the way.
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by FELNGR8
Nice torque bump there on the chart. Do you have an X-pipe on the car right now?
That first run it was definitely running lean, over 14 all the way. Some here might comment that you can go way richer but John doesn't seem to take it beyond the low 13s. Difference of opinion. And then he backs up the data log by pulling a plug and reading it. If you get a chance, can you ask John which side of the engine is # 1 and # 2 on the chart? I have the same divergence between the two and think my driver side is richer.
I saved the jpgs and hit them with some gamma correction. It brings out the lines a lot better.
That first run it was definitely running lean, over 14 all the way. Some here might comment that you can go way richer but John doesn't seem to take it beyond the low 13s. Difference of opinion. And then he backs up the data log by pulling a plug and reading it. If you get a chance, can you ask John which side of the engine is # 1 and # 2 on the chart? I have the same divergence between the two and think my driver side is richer.
I saved the jpgs and hit them with some gamma correction. It brings out the lines a lot better.
John said he would add more fuel to the program. Take out a little down low and add a lot more up top.
I asked him which side was which but now I can't remember.
sorry... He starts talking about all these numbers and setting... Its hard to keep it all straight in your head; I've never tuned a car before. He did say the passenger side O2 is reacting slower then the driver side. The passenger side O2 is a year or two old and the driver's side is brand new. I went out and bought another O2 and john is going to replace the older one to get the two lines to come together.
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by GS345
I took my car with Power Effects to a muffler shop, had them build it all 3" from header collector/ 3" cats/ x-pipe all the way to the Power Effects capsules. Sounds Wicked
jeff
jeff
Do you have any pictures?
Thread Starter
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by steve40th
Whos your mail order tuner?
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by Bluewasp
I'm using the EM long tubes with 2.5 inch pipes with the power effects 2 3/4 muffler system. There isn't a X-pipe only a resonator. Should I cut out the resonator and install a xpipe???
You do have one advantage over my setup. You can crank down the noise level in your power effects for cruising. My setup is static and when it's too loud I just have to put up with it. A low speed uphill pull in my car gets to be too much.
Thread Starter
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
I'm going to call robert monday and make an appt. to have him work on the exhaust. Does he fab and install everythig in one day or do you have to leave the car there for a few days?
As for the x-pipe, I thought the resonator acts like an x-pipe.. ??
robert
As for the x-pipe, I thought the resonator acts like an x-pipe.. ??
robert
Thread Starter
Race Director
Joined: Feb 2001
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by Bluewasp
I'm going to call robert monday and make an appt. to have him work on the exhaust. Does he fab and install everythig in one day or do you have to leave the car there for a few days?
As for the x-pipe, I thought the resonator acts like an x-pipe.. ??
robert
As for the x-pipe, I thought the resonator acts like an x-pipe.. ??
robert
The resonator mostly tones down the sound. It doesn't really have an open flow like H-pipes or X-pipes to get reflected pulses going to the other side.
