ScreaminRedZ

iTrader: (3)

Comparing dynoes never works, even if they are the same type and are corrected to SAE. I'm just looking at the 40 rwhp gain and looking at how the cars lined up previously. The only thing I can think of is that either 40 rwhp doesn't make as big of a difference as we thought, or our test doesn't work for whatever reason (even though it should work fine on paper).

I still want to get out and do a good pull from second to the top of 4th (first is never going to hook up this time of year) and see if the results are different.

PewterScreaminMach

iTrader: (7)

The fact is on a hot, humid day at a slow track, my car traps 117. On a cold day at a fast track, it trapped 121. And those numbers are with the cutout open, which gains me 1 mph (a track tested 1 mph).

With the cutout closed (so 116/120 traps), you did not pull on me anywhere from 60-110 in the same gear, so there's no way you're going to trap higher than I did on similar days. The only thing that might help is that I was running bias-plies and if you run radials of the same height, you might pickup a mph over what I did at the same track in the same weather.

Based on all of that, those traps sound weak to me for a car that was already trapping 115-116 on a hot, humid day at a slow track. Obviously we'll have to get it to the track to test it out, but based on all the tests we've done and having recent numbers from my car, it looks like it only picked up about 1 mph from TFS 215s, which sounds wrong.

Demonicbird00

iTrader: (17)

theres to many varibles when doing highway pulls. youll see the gains at the track.

ron like i said before, you need to get a fast and bigger cam and then youll see the max gains w/ the heads


-brandon

ScreaminRedZ

iTrader: (3)

I agree that the track will tell the story one way or the other. I don't doubt that a FAST and bigger cam will gain, but I shouldn't need to gain more hp to see a difference from the HP I've already gained. Spring can't get here fast enough, haha.

BayAreaSS

iTrader: (10)

I agree, something isn't right. I would be pissed if i was your bro

ScreaminRedZ

iTrader: (3)

On paper the tests we did should be pretty reliable. 4th gear is a 1:1 ratio, the cars have the same rear gear (4.10's), the tires are the same size (I know different brands might be slightly off even when rated the same size, but the difference should be negligable), the cars should be within 50 lbs of each other (I removed my rear seats and belts and my front swaybar, but I have the nitrous kit and I weight 20 lbs more than him). We even topped both cars off with gas before doing it to try and remove all variables. Also, the test was done several times to help eliminate a fluke run.

That being said, it's possible that somehow the test was flawed and that when we get a chance to do a good run through the gears I will pull, or at the track I will have picked up 3 mph. It's also possible that my car just isn't faster than his for whatever reason.

PewterScreaminMach

iTrader: (7)

I'm hopeful that it does pickup a few mph at the track but based on the runs we did, I just don't see that being the case. And even then, you'll have to compare on a similar day to when you've already run at Lebanon. If you go on a colder day, obviously it's gonna go faster. You can't compare cool 60 degree numbers to hot, humid 85 degree numbers, even if at the same track. Let's all cross our fingers when the warm weather arrives.

I believe the last time we ran at LVD was a May rental and it was in the 80s and fairly humid. It might have been a little cooler in the morning. You were trapping 115 most of the day with one or two 116 passes? I don't exactly remember.

ScreaminRedZ

iTrader: (3)

I'm thinking about putting my ET streets on the car so it'll hook up and then lining us up from at least a 2nd gear run. The taller tire will hurt me a little, but if the power is there it should still show up.

BayAreaSS

iTrader: (10)

Do it!

ScreaminRedZ

iTrader: (3)

We're gonna try and get it done in the next few days. I had the car out tonight with the 28" MT radials and it will hook fine in first, so we should be able to get a nice full run in.

BayAreaSS

iTrader: (10)

Nice, i'll be waiting for the results.

PewterScreaminMach

iTrader: (7)

Postponed. We got a ton of snow yesterday and the roads will be shitty for a while now, so I took mine off the road for the rest of the winter. If it doesn't sell first, we'll probably go back out early Spring when the weather warms up a bit and give it a shot.

ScreaminRedZ

iTrader: (3)

I did get around to tossing on the 28" MT drag radials and it makes the spool much more driveable in parking lots etc.

BayAreaSS

iTrader: (10)

Damn that sucks, we've been getting rain damn near everyday out here

ScreaminRedZ

iTrader: (3)

I talked to the guys at Harris Speed Works and they said that I can safely lean it out (on the 100 shot) a bit via correct jetting size. I believe that I will be able to carry my 100 rwhp gains out to the top of the pull by doing this. I also want to get my 125 and 150 jets squared away and see what it puts down.

ScreaminRedZ

iTrader: (3)

Just for the hell of it, I dynoed the car on another dynojet up here near me. The car made 424, then 422, then 424 back to back to back. Here's the graph for the best pull (best by about .5 hp, haha).



After comparing this one to PSM's (still a different dyno, but should be pretty comparable) it looks like the cars make similar power until about 5200 rpm and then mine starts picking up. If you look at his graph with the cutout open then he's definitely beating me under the curve. Looks like it's just a problem of my car being a torqueless wonder, haha. Hopefully my extra hp up top will allow me to run a better number at the track.

BayAreaSS

iTrader: (10)

I'm still trying to figure out where your torque is hiding. i think you are missing roughly 25tq across the board. Have you talked to RPM about that?

ScreaminRedZ

iTrader: (3)

I agree that the torque is low and I really think that's what's holding me back against my brother. The only thing they mentioned is that they recommend more cam and a FAST intake. Both of those mods always seem to gain more in the top end of the power curve though. I don't want to be making 450rwhp and 374 rwtq.

I wonder what the compression is with a stock bottom end, Trickflow heads milled to 59cc, and the GM MLS head gaskets?

BayAreaSS

iTrader: (10)

Yea if i were you i woudn't want to keep throwing money at it without knowing why the torque is low. I don't know what the compression is but i'm sure someone on here can tell you.

Nitroused383

iTrader: (10)

I would do a leak down / compression check, the numbers do seem a little soft. It doesn't sound major but you may have excessive blow by from your nitrous use. Your compression should be 11.42:1 assuming your pistons are .006" above the deck height like my stock motor is.