OK, here is the scoop. I really need some help in this area. I hope this doesn't seem long, but I am hopeing someone can give me some insite.

In 01/01 I dynoed my 95Z. It had the LT4HC, 2800 Vigi,
3.73's(12 bolt), LT's, CAI, 52mmTB, Ed W. tuning, 1.6 Pro Mags, MSD 6A ignition and GM blaster coil. I think that was all that was important. Oh and a cut out, but I never got numbers w/ that open. It yielded 351 rwhp and 381 rw torque. If anyone wants to see the sheet, I can scan it.

THEN, I installed GTP Stage II LT4 heads, LT4 intake, CC306, and tuning by PCM4less. WELL, I had really loved the new mods, b/c it pulled sick when I kicked it! On the way to the dyno, I had to pass a car quick on I40 and kicked hard at about 60mph, and I got a little wheel! I couldn't believe it. It was GONE. Scanmaster said 835 w/ 0.0 retard! I was excited to dyno. It was a different
dyno. A dynojet, just closer. It was a club event. My car was running so good. Then, it started.

My first run was 346 rwhp w/ 321 rw torque. O M G. I thought I would scream. 2nd run, I let the guy running the dyno run it. About the same numbers. THEN, I ran one w/ the cut out open.
That gave me 354rwhp and 343 rw torque. I still was VERY upset.
Where did my torque go? How did I lose 60+ torque. And lose some hp???????????????????????????????????????????????? ???
I was about to get into the fetal position and cry.

I was running a 7.8@86 w/ a 1.6 60' w/ the first set up. I have NOT run since the heads and cam. But I swear, that car eats it up! It LOVES that cam on the road. That 306 pulls like a mother
punching it about 50-60mph. I mean, UNREAL. For NA, I love it!

I can kick it about 40-45 and lose it about 10'!

So tell me WHY that happened.

I do NOT like having my car twisted that high either. This was a 2 hour drive, about 120 miles. I went home, and the scanmaster was showing me 4-9.0 degrees of retard of false knock. It does that, if it is ran hard for a while.

The dyno guy said I needed 8-9 degrees of more timing, and he thinks my tranny is slipping up high. It has 88k on it, hasn't been rebuilt. But if it was slipping, how could it be snapping SO hard when I kick it in the street? Tranny fluid is nice and red, and does not smell.

I check my BLMs regularly, and the fuel on right/left is good. I get 125/124 ish while cruising. Idle it is like 128/160. Right, left respectively. It may not matter, just thought I would throw it in there.

I also have LT1 Edit. I need to check it out I guess.

Just wanted to get some help here. If anyone wants to see the sheets, I can scan them.

BTW, no codes are present.

Thanks yall

 

When you dyno'd with the hotcam, did you have stock heads? If so there is no way in hell you wouldve put down 351 RWHP! Not saying you are lieing but that dyno was definately FREAKED up. With the CC306 camshaft and stage II heads it should be a little higher than it is, but not alot. I would say somewhere around 380RWHP with your current setup. Thats should be close anyways. But the 351RWHP on stock heads with the hotcam is BS.

 

Ok. I can scan the sheet for you, or you can talk to some of my club members. That car had the LT4 HOT CAM kit. And the numbers really blew their minds. It was constant numbers, consistent. That dyno is just fine. We had a dyno day, and everyone had decent numbers.

A little higher than it is now? Yes, You are saying 380rw, I would have loved that. That is more of what I expected. But to lose that much torque? No way.

Don't call BS on me, when you don't know the car. Too many people were there, and seen it. It ran damn good at the track. I never got to find out its consistent point. I went from 8.5's to 7.8's and could have gotten more. That was my last run w/ that set up. It kept getting better, so the true track times, I don't know.

Anyway, I posted for help, and suggestions, not to get called BS.
I have been on this BB a LONG time. I wouldn't come in here talking trash. I NEVER POST UNLESS I AM CONFIDENT of what I am saying.

 

Not sure what happened but this combo should be good for 400++ whp

 

was your first dyno run corrected to standard?
was your second?

 

I don't think he's calling BS on ya, but IMO you aren't going to see a hotcam car with stock heads roll 35X rwhp SAE on a 248c dynojet. Most m6 cars get into the 33Xrwhp range, but that's about it in my experience. IMO your #'s should have been around 320rwhp SAE. Of course with dyno stuff, you have to keep in mind that they can be made to say whatever the operator wants if they know what they're doing. Same reason alot of shops like to only give out STD corrected results, b/c high #'s keep people happy & coming back to that dyno...

The TQ discrepancy is probably from the new operator knowing not to count the converter spike & the first dyno operator leaving it in there/starting the run early... sort of goes along with the trying to give out impressive #'s to get repeat business IMO :-/

350-370rwhp with GTP stuff and a cc306 is about what i'd expect from an auto car... They don't ever seem to make much more than 37Xrwhp with manual stuff in my experience - about like most 25X peak cfm heads with acceptable midlift #'s.

Sorry to hear you're dissapointed with your stuff. FWIW I've seen repeatable dyno #'s come out of Woodbridge Dynotech in northern VA when cars from there went to other 248c's. John (the owner) doesn't screw around & might be worth looking into for a baseline run to compare #'s.

Good luck with it

-Phil

 

let me get this straight--your car feels FASTER and the dyno says it's SLOWER? right?

 

current setup about 380 cuz the 12 bolt. i have lt4 gtp heads ect. ect.ect with hotcam...and u see my numbers below...through a 10 bolt....i also have a 58mm tb and larger injectors...you might not be bringin in enough air or fuel or both....just a thought.

 

Yeah, I was expecting at least 370ish. That really sucked.

 

I don't know. He did over 30 cars that day, and he was very rushed, I didn't like that, but it was $50 a run, and a club dyno day. I wanted to ask a lot of questions. He knows a LOT about LT1s. And I love listening to him explain things. He really knows his stuff. Yall probably know who I am talking about, Jeff Creech, milkman

 

Thank you for your help Phil, I was waiting for your response

 

Yeppers.

Weird huh?

 

You said your current set up is 380? Just wanted to be sure I understood the first sentence. Yes, I have a 12 bolt, and figured that was a small factor. A 58mm isn't going to make the difference I should have had. I have a 52mm on the LT4 intake, it wouldn't be that noticable. I have SVO 30# injectors, and PCM4less said that was fine, along w/ other people, and watching the Scanmaster I am in the good ranges. Except at idle, BLMs are like 128/160! Compared to cruising in closed loop at 125/124.

Good thought like you said though. He mentioned I needed more timing, like 8-9 degrees??

Thanks for helping me out everyone

 

I agree on Jeff, Angela. He's a good guy and I've had a pile of customers go to him for tuning - some who had dynoed before/after at woodbridge as well, and the results were consistent between the two dynos. FWIW, Jeff always uses SAE cf I believe, and what it did at CAM is more than likely accurate.

Was the before dyno at CAM too? You said it was someone else, which is all I was really implying - that the before #'s were skewed/off, and jeff's are realistic/accurate.

Tune it & hit the track .

 

It was Precision Dyno in Belmont, NC. And everyone was really big on him, and he professional, yada yada, been in business a long time, ect. That is why we had it there that year. But since Jeff got this dyno, we started going to him.

He said it needed more timing, a little on the rich side, and I had tranny issues. But it sure don't feel like it on the street! It will snap ya neck!

I haven't been to the dragstrip w/ the new combo. Just the old one and that was the 7.8@87 (I had 86 mph posted at first, but I just went over it, and it was 87). I can scan that too if anyone wants to see it

Anyway, I have been a little nervous about taking it to the Dragstrip.

Anyway, I just know I have more hp than that. I have rode in cars w/ those numbers and they can't touch mine. 354/343? Nope. Won't believe it. Especially the torque. It don't add up.

I want to go to that Dyno in G-boro, but don't want to turn it up so hard again. I hate that part. You know, to get a 2 out of 3 number.

Thanks