rklessdriver wrote:
I don't think the air filter assy or MAF are an air flow problem right now. I know a couple of cars that are making more power with the same set up. Don't get me wrong, it's a restriction - as any plumbing infront of the TB is going be after a certain distance but plenty of folks are still running the stock stuff and making more power so I'd look else where.

I also don't think you have to have a 58mm TB at this point. However TB's are pretty cheap and really easy to change. If you want to try a 58mm TB, PM me and I'll loan you one I have sitting around.
Will

BrianCunningham wrote:
careful on the RPM with the stock bottom end

your already over what I'd rev it to.

BrianCunningham wrote:
from "over there"

[QUOTE]Weav's Vet;
Could it something on the other end, the exhaust? I had the cutouts closed when I made this WOT run. How about cats? Partially plugged maybe? Headers 1 5/8, maybe 1 3/4 would be better. I mean the air has to get out as fast as it's coming in, right?[/QUOTE]

could be the cats

how old are they

what did you install? (I see longtubes in you sig)

BrianCunningham wrote:
next time you dyno, yank the filter all together and see what happens.

Did you descreen the MAF?
It's really there to straighten the flow on F-body cars, which have a 90 bend in their air track

sounds kinda silly, but did you check and make sure the throttle blades are openning all the way?
don't laugh, it's happened.

what are the specs on the springs?
Seat pressure etc.

Josh wrote:
98 KPA is within reason for WOT. I don't think I see 100 in my car every time I floor it. Most of the tables in the tune go from 95-100 KPA, so at 98 you are using the WOT settings.

What is the elevation where you are? When I lived at elevation (4500 ft) the KPA readings on the car got a little whacky.

dan0617 wrote:
Have you looked at the datalog yourself? What MAF gms are showing? I don't think 94 MAP is very far off. Easily could be TB blades not fully tightly open. Carpeted floormat can cause that, I had that problem once. Might just need to adjust the throttle cable bracket a hair.

Maybe you could attach your datalog for a few of us to look at, or export it to a CSV file and open it with microsoft excel and look at it that way. I'm just not so sure you have a problem at all.

Josh wrote:
Doesn't the MAF max out in the tune at 255 GPS? I thought that was the limitation of the hex code used to write the software.

I would take the MAP sensor off and look at the hole it, see if there is some crap or something in there. Also, what does the data logger show the MAP reading is when the car is not running? If you aren't seeing 100 KPA there, the MAP sensor is probably bad.

That is where I would start. I don't think you'll see more than 255 out of the MAF sensor, and I think there is something wrong with the MAP sensor. I can't imagine that you'd be seeing enough of a restriction via intake tract to significantly decrease the power.

Aboatguy wrote:
Looks like in only hit 300+ in one cell....seems like most of the high flow was 280ish ....so looking at the AFGS readings I have to agree with your tuner something is amiss ...unless you didn't have the heavy air (..using your words) or your heads/intake...etc are not flowing what you think... do you have the approximate DA from datalog time, are your intake manifold lined up with the intake ports, are the headers/gaskets...lined up with the exhaust ports.....

Weavsvet wrote:
Quote:

Aboatguy wrote:
Looks like in only hit 300+ in one cell....seems like most of the high flow was 280ish ....so looking at the AFGS readings I have to agree with your tuner something is amiss ...unless you didn't have the heavy air (..using your words) or your heads/intake...etc are not flowing what you think... do you have the approximate DA from datalog time, are your intake manifold lined up with the intake ports, are the headers/gaskets...lined up with the exhaust ports.....

Density Altitude: 1430 feet
Relative Density: 95.88 %

The intake ports looked pretty good to me. The exhaust ...as you know the SW headers are D port so there is a slight mismatch there. I was told by someone at AFR a while back that they would be fine though. What else could I go by........

Steve40th wrote:
Back in post 13 you said your catalytic converter rattled? That is not good, it is broke if it is rattling. I would definitely look at it with the exhaust open so you can see if it is clogged/busted etc.

Steve40th wrote:
A busted catalytic converter can cause problems with Knock Sensors, and can be a flow restriction. If it is feasible, I would look into them to see if it is broke.
My 93 broke one at rockingham and it ran rich. I have a VHS tape from years ago where my we saw the difference at Rockingham when it broke.

Aboatguy wrote:
are your intake manifold lined up with the intake ports, are the headers/gaskets...lined up with the exhaust ports.....

Josh wrote:
I probably missed it, but what kind of power did it make? I assume the tuner discovered these issues on the dyno, right?

Aboatguy wrote:
I'd be more concerned with the fact that the headers/gaskets...blocking part of the exhaust ports..


I posted this on the other site...
AFAWIK blocking part of the exhaust port is going to hurt your performance... IMO time for headers that fit ....IE header opening are same size or larger than exhaust port...
Mike

Steve40th wrote:
I took my 1 3/4 headers and port matched them to my exhaust pots on my CNC heads so they would have no restriction. Mine are DRM stainless, so they are strong and a little grinding didnt hurt.
Mike, take a breather and do one thing at a time. That way you are sure whatever you did was correcting the problem.

Steve40th wrote:
Do you have pictures of your header gaskets up against the heads?

Weavsvet wrote:


I've asked this question before and the answer usually was I don't need different headers. But I also included the phrase "should I get 1 3/4 instead of 1 5/8 like I have now"". But getting 1 5/8 headers to match up with the size of the AFR port may be difficult. To me it would seem having the exhaust port match the header would be just as important as the intake matching the head. But what do I know.........

I also asked the question about the intake being the problem and the answer was that it was not because of one of these pressure readings. I'd have to go back and find which one though. I may be mistaken but I swear I read on AFR's website that they recommend the LT4 Air Gap as the preferred intake with these heads I have.

Weavsvet wrote:
You guys have got to listen to this. Is this normal?

I installed a PP 58mm tb on the car this morning. All in all idle is better or at least smoother. Throttle response is really nice but...........it sounds like a damn vacuum cleaner in the front of the car......at idle!

rklessdriver wrote:
Quote:

Weavsvet wrote:
You guys have got to listen to this. Is this normal?

I installed a PP 58mm tb on the car this morning. All in all idle is better or at least smoother. Throttle response is really nice but...........it sounds like a damn vacuum cleaner in the front of the car......at idle!

My 92 sounded the same way at the air cleaner when I had the 58mm on there. You should hear it now with the AS&M Mono Blade....
Will