user 647483

Are you rockers ticking?
I had to readjust mine 1/16 of a turn, now they purr

jimbob65

A cut out and E-pump will add some to those numbers too (especially if there's a bottleneck some where in your exhaust)...Hopefully, you don't have one of the factory blocks with a ".036 down the hole" (piston to deck) That's what mine was originally. Also what size thickness is your head gasket? Along time ago when I still had a 350 LT1, I used a stock factory gasket and it measured .054. That plus .036= No quench or compression....
Just some other ideas for ya

Denny McLain

I had one of those blocks in my 97 SS and couldn't figure out why it wouldn't make 400 rwhp using GTP heads and a 306 cam. After a year of messing with it we finally figured out exactly what you posted. No compression. Expecially with the stock gasket.

There are 50 ways of "screwing up" (not exactly how I say it), your a genius if you can think of 25 when it comes to getting the most out of these cars.

Don't know where to even begin w/o seeing the car and seeing it dyno.

95bamaz

are you getting plenty of fuel ?

Sweetred95ta

Did someone dyno tune the car? Do you know about what kind of timing you're running at WOT? You could spin it higher to get some more power, but your torque would have already peaked, and it's not what it should be. Maybe get the car to the track and see what it runs and we can go from there.

cause4panic

should also think about doing a compression test and a leak down test. just to see if the bottom end is happy

user 647483

Did you ever find your gremlin?

scrmnws6

Just for comparison, here's my dyno run...



I was not too thrilled with the hp #'s as well... 388 rwhp and then the 1.03 correction factor gets me the 400 rwhp. On the day that I dynoed it was about 90 degrees out and the humidity here in Chicago was crazy.

Im still trying to find a few more hp, but I just dont know where to look.

vin1382

i didnt read the rest of the of the thread but it looks like the pull is only to 6000 rpms and i can see the hp is still gaining.

Jon A

Yes. Why on earth are you guys (Kearn, yotaman96) stopping at 6K RPM? We have no idea what those engines are making at their peaks because you didn't measure it.

Denny McLain

Going to make ya feel even worse. Instead of rpm, the dyno chart shows mph and a common dyno trick is to use mph as there is always a spike at the end. You're measuring max hp at the spike which you can control how high it goes by the smoothing factor. Real common cheat trick to get a few extra hp and show bigger numbers. (Not saying you were trying to cheat, as I'd bet a bunch you weren't aware of it)

Corrected is corrected. In other words your actual is lower and the dyno upped it to 388 if the factor was 1.03. Deduct 3% and that was what you really made. Not 3% more.

However, there is a silver lining to this as it appears the engine was never taken to peak hp and needs to rev higher to show its real potential on both the dyno and on the street. Plus, it kills me to see tuning done in just three pulls. Guess someone's a lot better than me as we just keep trying things until the car stops responding positively to anything we do. You can get it somewhat close by flattening out the air/fuel around 13 to 1 but every car is a little different and some like leaner and some like richer. FYI….Pro Stock tunes to 13.7 to 1.

Some like less timing and some like more while others like timing changes at certain rpm's. And then you go back and tweak the fuel again. You not only look at the dyno chart's but log everything to see exactly what's going on to get it right and make sure the car is 100%.

SS RRR

I really really really really really hate dyno numbers.

scrmnws6

Denny- thats interesting. Just curious then as to why FLP would tell me that to take the 388 hp from the sheet and multiply it by 3% to get my true hp reading... the 1.03 was the correction factor... <--- this is what I was told after I took a glance at the dyno chart for the first time and my jaw dropped as I was expecting around 400 rwhp if not more, and after I was told that I felt a little better.

**** **** **** **** ****.

I do think that the car IS running pig rich, and the car seems to me like it WAS tuned in 3 runs. Ill ask FLP tomorrow what they think about your statement.

I was thinking about having the car re-tuned by FLP or looked over rather, but dont know how much that will run me.

Greg

2QUIK6

Hey Denny, I've made alot of progress on finding all the gremlins. Had an opti with worn out bearings, was getting all kinds of knock, had a grinding water pump gear, a few restrictive spots in the exhaust, and the stock convertor was slipping some which probably accounts for a large part of it.
I redid the exhaust with all mandrel tubing this winter, fixed the wp gears, found it was still getting alot of knock from the burst knock tables only for whatever reason. I got a wb and got the AFR to 13.1 steady, got a ram air hood/intake so no more restrictive intake duct. And got a nice convertor..its a little loose for my liking for daily driving. IT drives alot better now and has more power, but still haven't made it to the track, will get its first pass April 6th. Hadn't been back to the dyno yet either knowing that I will not stick with this combo due to drivability with the A4. I want to bring the torque back down in the lower rpms and run a tighter convertor.

Javier97Z28

Agreed. That's why the first place my car is going to is the track.

And if all goes well, that will finally be today.