Drivetrain Test Results Of Removing Pre Cat On Stock Header
6th Gear
Joined: Nov 2005
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From: Houston
I'm not too sure that it matters too much that you're using the gt-1. It might not be accurate, but the measurements before probably weren't accurate either. The deltas are what matter here. Sounds like this will be a good pairing with the webb exhaust.
5th Gear
Joined: May 2004
Posts: 1,088
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From: out and aboot
ohh... okay... i was just curious... i know some dyno's have a 1/4 mile feature...
Yeah... just so as long as people don't go spouting off those numbers as actuall 1/4 mile times... im good with it...
i think its great for comparison for mods and thing like that though... when you are comparing it to your car and only your car... i think you have a good idea
Yeah... just so as long as people don't go spouting off those numbers as actuall 1/4 mile times... im good with it...
i think its great for comparison for mods and thing like that though... when you are comparing it to your car and only your car... i think you have a good idea
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2nd Gear
Joined: Oct 2005
Posts: 106
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Originally Posted by isellem
ohh... okay... i was just curious... i know some dyno's have a 1/4 mile feature...
Yeah... just so as long as people don't go spouting off those numbers as actuall 1/4 mile times... im good with it...
i think its great for comparison for mods and thing like that though... when you are comparing it to your car and only your car... i think you have a good idea
Yeah... just so as long as people don't go spouting off those numbers as actuall 1/4 mile times... im good with it...
i think its great for comparison for mods and thing like that though... when you are comparing it to your car and only your car... i think you have a good idea
cheers
Accelerometers can be very accurate..
Especially on time to distance. Things that will screw up the numbers are any staging settings that can go into them, and pitch (the amount the car leans while accelerating). The HP numbers are a bit more suspect, as they are calculated based on measured acceleration, and the vehicle mass.
There was an article in one of the car mags where they were getting the G-Tech to agree to the 1/4 mile times within a tenth.
Oh yeah, the other screw up source is altitude changes where you run. Slight downhill=more HP!
But the best thing is that you get real world airflow with these suckers. No more worrying that the fans are too big or too small.
And yes, the deltas are what's most important.
Matt
There was an article in one of the car mags where they were getting the G-Tech to agree to the 1/4 mile times within a tenth.
Oh yeah, the other screw up source is altitude changes where you run. Slight downhill=more HP!
But the best thing is that you get real world airflow with these suckers. No more worrying that the fans are too big or too small.
And yes, the deltas are what's most important.
Matt
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2nd Gear
Joined: Oct 2005
Posts: 106
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yes, i agree with that, what i am doing is one thing at a time to find what works and what does'nt work. i hope i can find another stock header to to make a straight piece to replace the whole run between the flex joint and the main cat, then test it against this one. this header looks 100% stock, i would like to see the smog police find that this stock header has been tampered with,it would take a x-ray to find that it has been altered. this thing fits perfect, basicly the same sound level, and makes better power. i will post pics and results when i do the next one.
cheers
cheers
6th Gear
Joined: Nov 2005
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From: Houston
Make sure to take good pictures and remember what you do because I'm probably going to want to copy you. It doesn't help that I can't visually tell the difference between the original header and your modified one. 
Isn't that the point?
Originally Posted by MINIotaple
Make sure to take good pictures and remember what you do because I'm probably going to want to copy you. It doesn't help that I can't visually tell the difference between the original header and your modified one.
The little doo-hicky is gutted! To use the technical term....
Matt
6th Gear
Joined: Nov 2005
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From: Houston
Originally Posted by Dr Obnxs
This round is the totally stealth, undetectable by inspection, low cost exhaust mod!
The little doo-hicky is gutted! To use the technical term....
Matt
The little doo-hicky is gutted! To use the technical term....
Matt
Originally Posted by willy69
i started with a gt-1 made by passport, basicly a gtech copy. i will be the first to say the actual numbers may not be correct, but the differences in the numbers i believe to be true. i have not changed any parameters in the box since i started this test. the first time i had before any of the mods i have done was 14.65@96.7mph, this is with a 15% pully, cai, 2.5 dia exhaust. the best time i have had since adding the mods is13.50@108mph , i am running consistantly in the 13's according to the box. again not sure how accurate the box is. i will post the mods and increases i have seen from the beginning. as far as the header mod goes, i saw about a 4hp-6hp gain with out changing the ecu file, i am still waiting for the new file from mth. as far as the sound it may be alittle deeper but i don't notice it too be any louder.
cheers
cheers
Google and ye shall find!
Originally Posted by Bahamabart
How are you measuring this 4-6hp gain?
Matt
Originally Posted by Dr Obnxs
Once you have acceleration....
Originally Posted by Bahamabart
I didn't think the escort measured HP but I see that it does.
Matt
Originally Posted by Dr Obnxs
All you need is mass to do power. And RPM to do power vs RPM. It's just math.....
Matt
Matt
- here in the Bahamas, we need more 
Would love to somehow compare to a header - to determne which is a better bang for the buck - this mod or an OBX header (as an example).
yep
Originally Posted by TonyB
Slightly OT... I found a guy parting-out a Cooper about 45 minutes south of me. Are the headers the same (as compared to an S)? Thanks much.
Matt
Yep
Just checked realoem.com
up to 2/03 both used 1840750281
up to 9/03 both used 1840755274
No information on what was different between the two, but they both used the same number for the same times. Looks like the part was upgraded (who knows why, maybe it worked too good! ) but at the same time for both cars.... I didn't check all years and the like,
Matt
up to 2/03 both used 1840750281
up to 9/03 both used 1840755274
No information on what was different between the two, but they both used the same number for the same times. Looks like the part was upgraded (who knows why, maybe it worked too good!
) but at the same time for both cars.... I didn't check all years and the like,Matt
There's no difference in the photos...
Originally Posted by TonyB
Very interesting Matt. This guy says that his is an 02, so finding-out the difference would be nice to know. Looks like I'll need to do some research tonight
Probably the parts that you're planning to gut are what's different....
Matt
Did you do your Unichip tune yet?
I really couldn't tell...
But I didn't look at all years, and see if the gaskets changed, or if the cat back system did. But for the two parts I did look at, the head gasket was the same.....