Double06

iTrader: (1)

Was this the same dyno as the 680 hp 545 tq you did last year. If so, what would you attribute the bigger gains too you picked up 75 hp and 40 tq (assumes same dyno etc.). For example the heads were 50% of the gain with the cam and compression the other 50% etc.

Che70velle

iTrader: (6)

Hub dyno always reads higher than a conventional drum dyno, but I’m sure this car would put down a big number regardless.

grubinski

Why is that? Tire slippage on the drum?

02EBC5Z06

iTrader: (1)

Correct.. Slippage, deflection and lost energy through the tire. Etc.

rkupon1

iTrader: (3)

Rotating mass and friction of the contact patch

Che70velle

iTrader: (6)

Yes. The wheel/tire combo on the rear end is at least 50 lbs and when you buckle the rear tires to the barrel with the straps, it creates a lot of extra friction.

Ryans99ls1

iTrader: (16)

Congrats on hitting the goal! It's gonna roll out.

Are you still on factory computer? I figured it would pull well beyond 8 but not sure you are limited.

02EBC5Z06

iTrader: (1)

He has a Holley Terminator in it.

spanks13

iTrader: (5)

Is that the hydraulic roller giving up above 7500, or the tuning of the hi-ram?

jayyyw

I was able to get the graph to flatline on the run prior. It didn't like the extra fuel after 7500 on the pull in the graph. I even pulled timing down a few degrees in that area too. Peak power didn't move but it held on over 8000 with a little leaner AFR after 7500. Rather than to continue to beat on the car, I called it good and reverted to the last file.

The intake setup on the car will really shine over 120mph. So I have no doubt it will "make more" power on the street.

jayyyw

Not always. Really depends on the way the dyno is loaded. On these Dynocom dynos, you can really swing the numbers both ways. I did slower/heavier loaded pulls while I was tuning the car and then had the owner set it to his "normal" load numbers for the final pull.

Whatever the case, everything went well. Motor is solid, made great numbers, and should last a long time. I didn't get aggressive with it in the tune. Actually took slightly less timing than the previous setup. Probably some power switching to a TR7 plug over the 8s I have in the car, but again, I don't want to get aggressive with it. yet, at least...

Ryans99ls1

iTrader: (16)

No reason to run it on the ragged edge for 10-15whp. The air quality will affect you more than that. its gonna take cars with 850-1000whp to run with you at your weight, that is a win. Throw some nitrous in the mix and you are a very tough match up on any night.

jayyyw

Pretty much exactly right. Just gotta see what it can do now.

jayyyw

Missed this one. Its not the exact dyno I used but its the same brand dyno. Roughly same time of year. Shop was 100+ degrees this time, where the other shop was running the a/c.

I would say the heads and lift of the new cam contributed to most of the gains that were realized. Duration of this cam is slightly less both intake and exhaust. Compression was only .07ish more. Bore is .005" over.

Cesar wants to try to get more out of the setup. Kinda pondering what changes we can make, if any.

DualQuadDave

iTrader: (6)

You have a killer setup, and I think you are close to maxing it out. That being said, small gains can be made. I would try a spacer on Hiram and see how it responds. If you really want to get sophisticated, you can play with the taper on the intake runners. Have seen some setups really pick up when you get that right you may need to talk with a prostock/super stock builder to get insight into that. Beyond that, slap a CID intake on it, but it will probably pickup at peak and carry higher, but lose some middle.

helicoil

iTrader: (104)

Nice combo, great NA power!

jayyyw

Took the car out for a rip over the weekend. Had a few issues pop up but was able to get some data.

Seems like the clutch solenoid was somehow activating and cause the clutch to slip during the shifts. I changed the settings around to not let it engage over ~30mph and I opened the valve all the way, so even if it does activate, it shouldn't slip. If it continues to do so, I'll just pull it out.

2nd gear doesn't look like it will hook at all, with the gearing I have. As soon as I got into it, it kicked the car sideways. I'll likely be going back to a Z06 ratio trans and this should help "soften" that hit.

Ended up filling the catch can up on the first hit, which has never happened before. On the second hit I did, it spit oil out all over the pass side of the car. I moved the vacuum port to the front of the pass VC instead of the back of the driver side VC. I also let it engine brake after the pull and have a feeling that is why it filled the can, so I will no longer be doing that, lol.

Other than that, the car sounds great and feels great. Definitely some potential there once the bugs are fixed. I don't know if it will be as fast as I hoped but it will be close.

There's a video on my IG that I posted a few posts up.

logan2ss

Definitely heard the clutch grabbing hard on the shifts. Btw - time looks great factoring in how long the mph was still between each gear change.

Fwiw if you could get some kind of comparison on a dragy from 2.97 to 2.66 gear sets from 60-130/100-150 that would be doing a big service as well.

Car is going to give a lot of people a hard time.

jayyyw

We are talking about trying all 3 transmissions. 2.97, 2.66, 2.29. Lots of work but will definitely be some good data.

For what that pull was, it was faster than the last setup's "official" dragy time. Even spinning, it did a .054 60-70. So it was still moving forward pretty good.

logan2ss

lot of work but a big payoff.

That’s cooking. I have no doubt it’ll be getting down there given good gear changes and good air.