chasgiv3

iTrader: (1)

Well I'm a little disapointed but here are the numbers:
491.0 RWHP
482.9 RWTQ
My MAF was pegged at 58.1 lbs when this happened the O2s went through the roof. Off the scale it went....It was less than 10:1 on the Wideband O2.

Does anyone know what this would do to the power? My timing was down to 16.5 at the higher RPMs....I wish I had LS1 edit to modify some stuff.

Another issue was my boost controller. I thought the thing was not right when we installed it and the thing didn't have a stop on it. I bought a new one be we never installed it.

So 6lbs was the max boost. We were looking to crank it up to 10lbs. Big thanks to Pugs for bringing me the 5 gallons of 100 Octane..
That stuff smells good!

So it's back to the drawing board for now. Fix these issues do a little testing and back to the dyno to check things out.

Time to go look for a trailer me thinks.

Cool28

iTrader: (2)

IF you have a stage 1 why you disappointed? I finally got my runing good tonight. See my post. 16.5 isn't bad. with turbos your better off running that kind of timing.

y2khawk

iTrader: (5)

well first, do you have tuning at all?

i would assume you do if you're using 42# injectors. And based on the upper RPM timing numbers.

Built motor?? With teh pegged flow numbers at only 6 psi i would guess so.

You can get more airflow measurement. If your tuner has any creditibilty they can extend the MAF range. I see near 64 lb/min at 10 psi, and peg it at 67 lb/min on 12 psi.

If you're runnning a 10:1 motor still, 16* is about right. I run about 15* at peak torque, and ramp that back in to 21 at 6200. I'm set to run 7 psi on pump gas and that timing. putting down about 460 RWHP on a mustang dyno. Pushing to octane up to about 100, lets me run 10 psi and put down 570 RWHP.

what's you setup like motor wise??

I wouldn't be disappointed at all <img src="images/icons/smile.gif" border="0">

chasgiv3

iTrader: (1)

This is a heads and cam car. I thought the timing was a bit low but maybe not....

The PCM was programmed by Ed Wright and was supposed to include the extended range on the MAF. I think there may be a problem with it. I'm sure Ed will take care of things no problem.

I have the 42.5lb Lucas injectors. The compression ratio is close to 10.5:1 with the GTP stage 3 heads. Cam is a 232 232 .568 116 LSA.

I guess it ran pretty well considering all the problems. Just have to work through the issues.

Below is a log of one of the dyno runs...

http://www.ls1turbo.com/logs/CG3dynorun5.htm

y2khawk

iTrader: (5)

Judging by the first post, you were running 100 octane. Good <img src="images/icons/smile.gif" border="0">

With the CR up as high as it is, and the cam looks like it will still give you alot of mid range cylinder pressure, the timing is pretty good. But, i'm betting w/ the octane and timing, you could bump it up a few psi w/o problems.

Now the MAF thing. I've seen and heard the "extended MAF range" thing on a few cars already. They do it wrong every time. Usually the fix is bumping up the threshold that sets the HIGH MAF SIGNAL SES. But they never bother to fill in the upper air flow ranges.

Once corrected, you will eventaully hit the limits of the PCM not the MAF. The MAF has enough range to take you up to 67 lb/min. Which happens to be about 512 g/s. Sounds like a software limitation to me, max values that fall on binary number boundries are notorious. like 256, 512, 1024, etc.

The pulse widths seem ok, i'll have to dig out one of my logs w/ the 42's. I'm running about 12:1 so they will be less for sure.

Call Ed again, and tell him what's up. We can feed you enough info so he doesn't screw it up again <img src="images/icons/smile.gif" border="0">

chasgiv3

iTrader: (1)

Harlan, sounds good.

I'll send Ed an email and see when I can send him the PCM. I'll let him know that he needs to fill in the ranges.

But just a question....if LS1 edit is available do you think I would be better served just getting that? Or do you think there are too many limitations with that?

Let me know and thanks

1HoTTZ28

Get it tuned. I have a stock motor car, running 93 octane at 7psi of boost and I'm making what you see in the sig. Remember, your 12 bolt and 4.11's aren't helping much either.

[ November 25, 2001: Message edited by: 1HoTTZ28 ]</p>

chasgiv3

iTrader: (1)

Sounds like I'm in the ballpark. Anybody think I can hit 550RWHP with 6lbs and perfect tuning?

Some people think so...I'm not so sure. I'm hoping I can get this done before Winter sets in.