Now that I have your attention.
Here's a before and after pair of runs. First run is with the Alta @ 180 hp and 157.0 lbs/ft. Second run is with the Webb HDI 185.4 hp and 157 lbs/ft.
3 hrs between runs and it was 12º warmer for the second run.
Also had the Powerflex yellow inserts installed. Part of the 3 hr delay.

Let the games begin.
First graph is the Alta vs HDI runs. AS noted 3 hrs between runs and 12º warmer.


Next day 20º colder. No other changes. No changes in mods the only difference is the comparison between the day before best run(2-25-06)RED and my best run on a cold day(2-26-06)BLUE.


EDIT: Added HDI pic

 

Excuse me but what are they?

 

Sorry.
They are the urethane inserts for the large diameter motor mounts.
Did not do the purple inserts for the smaller diameter side of the mounts.



New washer comparo

 

Stock +intake or any other mods to reach those #s can I assume ALTA = blue Webb HDI = red

 

Nice Obe

Any impressions beyond dyno numbers? Change in tone etc?

Thanks for posting

I think you've got those reversed.

 

holy crap... Those are awesome numbers.

 

I think it is the other way around.

 

Yeah, looks like the HDI faired pretty darn good. obehave, what intake tube were you using with the hDI? Also, did it have the "larger" filter?

 

there's a larger filter?

 

Edited my post and hopefully cleared up some confusion.
Sorry about that.

I was intentionally vague since this isn't really a thorough comparison. Just some befores and afters. Just wanted to stir conversation
The guys at Abacus were great but they had not done any MINI runs before so they learned on the fly. Did a nice job of it too.

Intake impression?

I like it. Well made, simple install.
It does reduce the intake sound you get in the cabin. Not very much though. One interesting point, the "Alta Whistle" is not just an Alta phenomenon. I still have it.
WOT sound? Slightly reduced but still very nice. Good stuff.

Butt dyno? Seems to pull a bit better sooner.

In a nutshell;
Another very good option in the induction kit arena.

 

thanks for posting your findings....it once again illistrates what I too have found....it's not about which one you SHOULD get....but more about what you like...

4 HP and or 5 ft lbs of tq are not enough to feel or even matter....

good stuff...thanks again!

 

I too don't understand which are which...?

 

Used the ALTA tube. Saved some money and the Webb tube wasn't in stock at the time.

I'll take a side bt side when I get time. If I knew the part numbers maybe we could get a surface area comparison.

Random uninformewd thoughts;
The Alta filter has girth, the HDI Uni filter has length

I actually like the longer filter, more time for the air column to straighten out.

 

Yep. We'll see as more people test and post. If my results are the norm then it does make a difference when you stack it with other incremental improvements.

I mean how many posts have we all read about how great the 63mm throttle body is? Even on stock cars that shouldn't even be running one.
This is much cheaper than a TB and probably showed as much gain.
So why bother getting a TB?
Why bother with headers that don't do much more?
Why bother with a cat back that doesn't do much more?
Why bother with lighter wheels/tires that don't equate to much more?
Why bother with a larger IC?

To say 4-5 HP doesn't matter is just wrong.

 

I think Tuls is right in that 4 hp by itself doesn't mean much -- but only if that's the only increment you add. If you do all of the other things you listed, then yeah, 4 hp does matter, because added to the others, you're adding 15-20 hp.

 

I agree. But you can't minimize it by saying it doesn't matter as a blanket statement. That's wrong.
0 HP doesn't matter.

 

Please clarify the graph chart colors, which is which.
Blue =
Red =

 

Obe, Your comparison is vs the Alta intake, not stock. So 4 hp over the Atla's previous increase is actually......what a total of 6-8hp? I'd take 8hp anyday.

Have you done the hp per dollar comparison. HDI sounds like a pretty inexpensive way to get 6-8 real horse power.

 

and a clean with the Webb, the numbers will be skewed.

If you do very, very carefull testing, the repeatability of HP measurements is 2-4 hp peak.

If you do 5 runs in a row, you can get a bit better statistics.....

But it's a pain...

Matt

 

Red= Morning run. Car as it was.

Blue= Afternoon run. HDI intake and Yellow Powerflex motor mounts. Ambient 12º higher.

 

we are talking about intakes right...SO

what yo uare missing is that that 4-5 HP will always be 4-5...you are not going to get MORE than 4-5 between intakes...and I am sorry but if my dyno reads 295 or 300....well if I want that extra 5 I can spray the intercooler before my next run....that's my point....the sum of parts matters....yes...

Again...with intakes...it's doesn't matter WHICH one...adn with the amount of parts I have tested...I have seen it over and over...every combo of itake pulley and exhaust I tested resulted in the same amount of HP gain give or take 3-5 hp...and when you get down to the nitty gritty...you'll never miss it and it's not enough to make a difference...we are not driving formula cars on a track where that 5 hp will give us a one tenth lead....

 

Absolutely right Matt.
Didn't have the money for one thing

Yea there were variances that keep this from being ideal.

The Alta was cleaned well about 2K miles ago. All urban traffic so it wasn't dirty.

TBH the original post was to post my dyno figures, which were about what I expected, and start another dyno flame thread

 

Actually, brand new filters flow less than filters that have a couple hundred miles on them. The amount of oil that comes on both the Alta and the Uni makes it hard to flow at the maximum rate. Just something to think about...

-Brian

 

Like I said earlier. I agree with the point you're making.

I only said, and you agreed, that it does matter as an increment.

 

werd