Corvette Z06 Forum banner

1 - 20 of 33 Posts

·
Registered
Joined
·
238 Posts
Discussion Starter #1
Has anyone out there run a Dyno stock and then with some type of induction (Halltech, Blackwing, K&N, etc)? I'd like to compare notes. So far, my unconfirmed results (to be confirmed on 1/28) are like 6 horsepower increase. Surely this is low. Also, curious about any change in Air/Fuel ratio. Mine is running way rich (11.4/1).

Hoping that this is a fluke and that I shouldn't have to start all over.
 

·
Registered
Joined
·
5,414 Posts
AF Ratios

gnoub,
you're ratios should be around 12.5/6 and then they would be near perfect...........you have some power left there....that needs to be addressed........
And, contrary to popular belief......most intake only mods only net around 10rwhp.....so, get you're head up Mr.!!!!!!!!!!!!;)
 

·
Registered
Joined
·
238 Posts
Discussion Starter #3
AF Ratios

Yes Sir!

I'll take 10. Anyway, any suggestions on how to get the ratio's into the 12's?

Gary
 

·
Registered
Joined
·
5,414 Posts
gnoub

I would think the Dyno facility would have the equip neccessary to do the adjustments..........check with them.
 

·
Registered
Joined
·
837 Posts
Optimizing the AF ratios takes either a MAF translator or custom PCM tuning. Brent EB06, a member of this forum has used a (Ramcharger) MAF translator to good effect; believe he said Cartek installed it and got it properly dialed in on their dyno. Butcher did much the same; I'll see if I can dig out the thread....

Ranger
 

·
Registered
Joined
·
638 Posts
As far as I know, you will need a MAFT. You can use this with other mods that will effect AFR also. I did the install myself and tuned via a Ease scanner. You can't tune in one shot on an dyno. I have three diff. settings tried so far and just settled now. The tuning takes more than a 30 sec. dyno run to kick in.
 

·
Z06 Power Adder Authority
Joined
·
3,265 Posts
My '02 was richer than yours on the 3 pulls I did. Granted, the thing was still "learning" as I had very few miles or WOT pulls on the car before dynoing it.

I am going to try and get back over to the dyno this coming week. I have installed the Vortex Rammer airbox. We'll see. I'm hoping this will lean out the A/F ratio to the mid-12 range, if not 13.0:1. For a N/A motor, ratios like this are great.

If it doesn't lean it out, then I may consider modifying the MAF harness and installing the MAFT. Right now its not a "plug and play" on the '02 cars...and I'd like to wait for that, but may not have the patience to.
 

·
Registered
Joined
·
469 Posts
gnoub

hey...getting the a/f ratio right is critical....my car on the dyno was 377 rwhp no maft...
then while on the dyno we installed the maft. tuned to 8% lean at wot. and bam!!! 392 rwhp SEA corrected...
i was following butchers threads to see where to set the maft. after 5-6 pulls on the dyno thats what the results were.....
 

·
Registered
Joined
·
238 Posts
Discussion Starter #10
Brent - Those are sum incredible numbers! My goal would be to achieve the same, provided my checking account doesn't run dry soon.

Ranger - Thanks for the link to Butcher's thread. A lot of this is over my head (man, I have a lot to learn), but it's obvious that I need to look into the Ramchager option and find a good tuner. Any recommendations? Would you go with the balance of the T1 Kit? What was you AFR on your last pull?

Gary

PS. This site is great. It would take months to learn what you can in a few minutes. I love my Z and the Internet.

PSS. Ranger, I was out today trying to get a little launch practice. Not many police free zones here, but for sure 55 degree temps help a lot. I did prove to myself that I need more practice!!!!
 

·
Z06 Power Adder Authority
Joined
·
3,265 Posts
brent EB02 said:
gnoub

hey...getting the a/f ratio right is critical....my car on the dyno was 377 rwhp no maft...
then while on the dyno we installed the maft. tuned to 8% lean at wot. and bam!!! 392 rwhp SEA corrected...
i was following butchers threads to see where to set the maft. after 5-6 pulls on the dyno thats what the results were.....
Brent,

I thought you used Halltech's AFR Calibrator and not a MAFT?

If you're using the MAFT how was the install as far as splicing the wiring?

From my years of tuning hot-rods, I _know_ that tweaking the full throttle A/F ratio will yield good gains ... both in power and driveability... BUT, finding the right tools to do it with is critical. :)
 

·
Registered
Joined
·
837 Posts
gnoub said:
Ranger - Thanks for the link to Butcher's thread. A lot of this is over my head (man, I have a lot to learn), but it's obvious that I need to look into the Ramchager option and find a good tuner. Any recommendations? Would you go with the balance of the T1 Kit? What was you AFR on your last pull?....
Gary, I've tried to see what I could do nearly bone stock (just the Tric). My AF ratio right now is running very rich (11.3) at WOT on the dyno. I'll probably go the MAFT route once I get the car into the low 11.8s as it is, hopefully that could occur this spring.

The cheapest addition from where we both are is a MAFT translator (less than $200 for the part), not expensive to install. And perhaps two hours (or less) of dyno time to get it dialed in. Tony's could do the install and the dyno guy at Altered Atmosphere, whose name I think is Roger, could easily do the dial in.

Just keep in mind that you can cool the engine down between dyno runs by idling the engine with the AC OR defroster set to max and the fan switch at max. That's a Vette thing that the operator won't tell you.

On an 01, your injectors are big enough, so the balance of the T1 package would seem unnecessary.

Finally, keep on practicing those launches. Capitol will open someday.

Ranger
 

·
Registered
Joined
·
238 Posts
Discussion Starter #13
Ranger - 11.8's in an '01 with a big filter. WOW. I hope I'm there to see. Guess this means that it will have to be MIR. Does this mean like 11.5's with MAFT and some headers?

Going out right now to practice shiftin'. Just hope I get into the 12's on my first run. Hope we don't have to wait until March!

Gary
 

·
Registered
Joined
·
5,414 Posts
Ranger........

Interesting thought.................
What WOULD/COULD a MAFT do for an '01???.
Do you think the % of net gain/s would be in line with the '02 #'s...........or ?????
You're input....................:-?
I (For some reason) have always assumed the MAFT tools/techniques were specific to the '02's because of the changes...............dunno??/
 

·
Registered
Joined
·
837 Posts
Re: Ranger........

ZO6LS6 said:
What WOULD/COULD a MAFT do for an '01???.
Do you think the % of net gain/s would be in line with the '02 #'s....
ZO6LS6,

A properly dialed in MAF translator should lean out the over-rich condition at WOT on an 01 too. Percentage gains should be similar to what Brent EB02 obtained on his 02. More power and better fuel economy. What a concept.

I'd do it tomorrow if I didn't have another tenth to find where I am now. But a MAFT and a set of the LG Motorsport long tube headers would make me nearly swoon.

Ranger
 

·
Registered
Joined
·
5,414 Posts
Ranger......

I can dig it........Roger Ramjet has brought up a very salient point.......and, that is as WE adjust these #'s, the PCM is / can / will be redialing the original #'s right back into the car.......

If so, ( and I think yes), how do you STOP this from occuring??.

Constantly having to adjust a MAFT, would seem to be a tedious and tiring thing..........am I all wet or what??
 

·
Registered
Joined
·
837 Posts
Z06LS6,

I missed that post by Roger Ramjet. Gotta link to it? Would like to read what he said.

Since the MAFT is hardwired in and makes its corrections all the time, not sure how the PCM at WOT would do what you're saying.

Ranger
 

·
Registered
Joined
·
5,414 Posts
Ranger

PIT ROAD.........
Thread,
WOT Fuel Trim

Help me out, are you saying the MAFT ONCE hard wired in..........makes the corrections WITHOUT you're input.......on a continual basis??.:-?
 

·
Registered
Joined
·
837 Posts
Re: Ranger

ZO6LS6 said:
PIT ROAD.........
Thread,
WOT Fuel Trim

Help me out, are you saying the MAFT ONCE hard wired in..........makes the corrections WITHOUT you're input.......on a continual basis??.:-?
From that thread

WOT Fuel Trim

Roger Ramjet said: "Thanks C4C5 for the information.

I thought that LTFTs 1 through 19 were for part throttle operation but LTFT 22 was didicated to WOT. If that is true, is cell 22 only a fixed power enrichment value or does it get updated via some algorithm?"

c4c5 Specialist replied: "I do not know what cell is used for the WOT pulsewidth programs. It is always a fixed value, and is not updated, unless you have an updated calibration value installed by reprogramming the PCM."


c4c5 Specialist went on to say: "You see, when you are WOT, your engine is in power enrichment, and defaults."

Thus, the MAF translator will make its "constant correction" and, assuming it's properly dialed in ONCE, will maximize rwhp thereafter by achieving a near ideal AF ratio.

Ranger
 

·
Registered
Joined
·
5,414 Posts
Ranger

Thanks for the interpolation............sounds almost too good to be true.
With a couple of mods, even the '01's should pick up an additional 20-30 rwhp..........:eek:
LGM LT's.......pretty, and Expensive...........and, good.:)
 
1 - 20 of 33 Posts
Top