GIFO3 Sidebar: MattRoberston's Gibson Header results

[CoolVanilla]

MattRoberston had his headers installed 10/10/05. Download the raw data and reader here: https://mydata.datadepositbox.com/SS/SharedStorage.asp?id=484c2c8725190fa5411926c52ae03 b0d26c5345421b848ad321b00852e94 (enter your username, no password is required)

Here is a summary of the results:




Take a look at this chart. Notice that with the GSM modification turned off, we get a nasty dip in hp and torque when the tranny shifts.


With the GSM modification turn on, that dip is greatly reduced:


Here they are, overlayed:

I could not define separate colors for torque and hp, and between runs. The higher line for a color indicates torque, the lower hp. The point here is just to show the difference the GSM mod made.

And, to show the difference in acceleration. Take a look at the differential up the power curve; looks like an increase of 10/10 or so in some places!


It should be noted that, of the 4 dyno runs with the GSM modification turned on, this is the only one that shows a reduced dip; all others show a similar plot to the stock. I'm not sure why this would be the case, but we'll be checking into this soon.

[MattRobertson]

At a guess, wheel weight isn't much of a factor if at all on speed. Remember my track times at the first GIFO and the dyno numbers at the second. I was right there with you stock wheel guys on the dyno, and had 2nd-best track time by a teeensy hair :-) ... and my wheels weigh 38 lbs.

EDIT: Now that I have stuck the wheels on a scale I find that what the mfr told me was wrong. They weigh only 30 lbs.

[SilverMagRT]

If you can't find a loaner Volant, that you can get without shipping, I can put my stock intake on [I'll miss all the added horsepower ] and ship my Volant to you, I'll pay shipping both ways.

[magnumdude]

Deanna says "awesome!!"

[RTracer]

Alright, if this comes together I am definetly comming. GIFO I missed due to not knowing it was in Nor Cal...GIFOPE I missed cause I extended my Florida Vacation..Now this one I really want to make.
Calabahn...Do you still have the 6 disk?

[CoolVanilla]

All, Josh at HighHorsePerformance has done it again; he and I are currently working together to provide a set of Gibson headers and Magnaflow High Flow cats for this test. I can't say it enough; Josh has gone above and beyond what anyone might hope for from a distributor or vendor. He really deserves your first look when you consider any aftermarket modifications to your LX. I don't have to tell you how important it is to support those that support us; but I do feel like Josh deserves that extra pat on the back. Without his encouragement both verbally and financially, we would not be having this discussion.

Please review the rewritten first post. With the original set of test ideas as well as the addition of MattRobertson's test results, we really stand to gather a ton of good information this go around. We've got a good distance to go, though, financially. Lets make it happen folks!

[snickle]

Way to go Josh.

I am paypaling money now for the fund.

[MattRobertson]

Hey all, FYI:

My header install and dyno runs are not a part of any donations you make to GIFO3. Contributions are only going to the CVMobile's runs, where CV will be running his usual rigorous testing on multiple intakes. I planned my install myself and wanted the dyno runs so I had them priced in. Its just a lucky factor of geography (and the fact that I trust the folks at SVS after spending two days there looking at what they do and talking to Bob) that I happen to be doing my install at the same dyno facility that we've been testing at.

If I have enough time I'll also be testing with Fuse 17 pulled (to see if it affects the power dropoff during shifts).

Another point of interest will be the fact that I'm using ultralight 20" rims now. We have dyno runs of my car at GIFOPE running my heavier 18" chromed alloys, and 1/4 mile times with them that both showed I was right up with everybody else in both HP and time. Will be interesting to see if we get any differences on my pre-install runs, where the only difference will be the wheels (and the temp/humidity, but hopefully we can figure out how to correct for that).

So my first run should be useful in determining the affect, if any, of the light wheels. We can compare that to CV's first pre-install run with his somewhat heavier 20" wheels and see if we learn anything useful on that score.

So if you guys were thinking that the bar was a double-set of dyno runs, it ain't. Step up, people. You can't lie to the dyno, and we'll all benefit from this.

[CoolVanilla]

Thanks Matt. I'll update the original post.

Thanks to Matt's willingness to pay for his dyno tests, we can lower the required fundage. I think we should shoot for $400; that will cover the dyno time and track runs. We're half way there people!

[IDSmoker]

Matt or CV: Are either of you planning on getting the new GSM Traction/Fan mod done before the dyno runs?

[MattRobertson]

Matt or CV: Are either of you planning on getting the new GSM Traction/Fan mod done before the dyno runs?

maybe. I don't want to be the first one to jump on it. I want to see other installs and testimonials.

[jarrod]

Do The Nos!!!!!!!

[hyperbolic]

After two rounds of intake tests I don't see the point of another round. Tests of the just headers and cats would hold some interest.

Good luck with the project anyway.

[MattRobertson]

After two rounds of intake tests I don't see the point of another round. Tests of the just headers and cats would hold some interest.

I think its morphed beyond simple intake at this point. Its more of a general 'breathing' test.

We'll be seeing what happens when you have put an intake and exhaust on, and then toss on the reasonably-priced Gibson headers (both with hi-flow cats and stockers). CV's tests will be with the hi-flow cats so you'll be seeing best-case results coupled to a few intakes, which will be helpful to the various folks out there who have one intake or the other.

From me, you'll see the po' man's install with the stock cats coupled to an intake/exhaust. Just one intake from me.

Plus the both of us will have different wheels, so you can draw some comparisons from that as well. Should be neat. We're coming up with a hell of a lot of standardized info. All coming from the same cars and the same dyno.

[BrilliantBlackHemi]

The traction mod should do nothing on the dyno since the reading is usually taken in one gear with no gear change. The traction mod removes the engine power drop during gear shifts to make it softer.