LS7/L92 Results

[JerzBadSS]

Here's the results of my combo on a Mustang dyno. My compression is about 10:5.1. The vid is kinda long so start 4:35 into it to skip through all the BS.
http://videos.streetfire.net/video/Tune-Time-Performance-SS_169138.htm

[willyfastz]

Is the drivetrain loss that high in a Trail Blazer? Or was it just due to being on a Mustang Dyno?


Sounds bad ass though.

[JerzBadSS]

Is the drivetrain loss that high in a Trail Blazer? Or was it just due to being on a Mustang Dyno?


Sounds bad ass though.Thanks. Theres a little more left on the table, its not done being tuned yet. You are correct, those numbers are due to the Mustang Dyno. The rollers have a drag which is set to the curb weight of the vehicle which in this case is 4600lbs. To get Dyno Jet numbers just add 1.135% which comes out to 500rwp/488rwtq. Awd TBSS's have a higher drivetrain loss though. Mine was originally awd but I converted it to rwd.

[willyfastz]

Gotcha, how did you come up with the 1.135% figure?

[JerzBadSS]

Gotcha, how did you come up with the 1.135% figure?Research and comparisons. My tuner also confirmed the figures. If I'm not mistaken the Mustang Dyno has the capability to show the differences too.

[willyfastz]

It deff. sounds like more than 440rwhp:drool:.

That's funny that Mustang would put a Dynojet corection factor in their software.

[JerzBadSS]

It deff. sounds like more than 440rwhp:drool:.

That's funny that Mustang would put a Dynojet corection factor in their software.I can easily be mistaken on that. Heres a quick clip from the Media section...
http://www.hardcorels1.com/vbulletin/showthread.php?t=1535

[wkmcd]

It deff. sounds like more than 440rwhp:drool:.

That's funny that Mustang would put a Dynojet corection factor in their software.

You can put any correction factor you want in an MD adjusting vehicle weight, etc. It's all up to the integrity of the operator. I'm not a big fan of people who say my car made xxx on an MD or xxx through 4.10's so it really makes 50 more rwhp. The numbers are what the numbers are - a reference that is only good on that dyno under those conditions. Way too much dyno number BS going on nowadays and people are putting way too much stock in comparing one dyno and operator to another dyno and operator.

[JerzBadSS]

You can put any correction factor you want in an MD adjusting vehicle weight, etc. It's all up to the integrity of the operator. I'm not a big fan of people who say my car made xxx on an MD or xxx through 4.10's so it really makes 50 more rwhp. The numbers are what the numbers are - a reference that is only good on that dyno under those conditions. Way too much dyno number BS going on nowadays and people are putting way too much stock in comparing one dyno and operator to another dyno and operator.You said it perfectly, well put. I don't particularly care for the whole "how much horsepower" thing either. Now a days its like dynos are nothing but a tool for publicity and deception used for increased profit. All a dyno really is is a luxury testing/tuning tool to observe and make the proper changes. To tell you the truth if I owned a performance shop I wouldn't even announce any numbers, I would just put my decal on the vehicle and make sure my builds rape every car or truck in its class. Numbers don't mean **** once that 3rd light comes on :icon_bigg.

[willyfastz]

My dyno sure isn't a good advertisment tool. As a few up here knows already it seems to be the lowest reading dynojet on the east coast. But like Jerz said when my cars go to the track they nornally rip the heads of most the cars from some of the other high reading dynos. That's all that counts in my book also.

[JerzBadSS]

My dyno sure isn't a good advertisment tool. As a few up here knows already it seems to be the lowest reading dynojet on the east coast. But like Jerz said when my cars go to the track they nornally rip the heads of most the cars from some of the other high reading dynos. That's all that counts in my book also.Thats all that matters brother :cheers:. Now back to the topic. Heres my thoughts on my combo. The truck pulls like a freight train in 3rd gear and makes pretty decent power down in the lower rpm's too, but I think it can do alot better off-idle to 6000 if I change the heads. I think these L92's are a great F/I head or better for a lighter vehicle. The other problem is that theres no option what so ever for a manifold. I think the mistake I made was choosing my heads according to .600 flow numbers. I'm looking at either AFR 225's or the new Trickflow 235's and bringing the compression up to 11-11.5:1, then adding a ported FAST 92. I'm not sure on changing the cam but maybe just advancing it 4*. All of the above should gain me a decent amount of TQ under the curve rite? Or should I just add the nitrous first and see how it reacts? I'm no pro at this so fire away. :headshot[BTW: I did 3 shakedown runs at the track on stock tires. 85* and DA was 2800ft. My best run was a 12.37 @ 109.59. Best 60' was 1.73 and that was on stock Goodyears. Also this was my first time running since converting to RWD.

[Black_Knight]

converting to RWD.

What's up with that?

[JerzBadSS]

What's up with that?That was a long painful thought out decision. This was my conclusion...AWD= less power to the ground, 300lbs heavier, and hell on the trans. 4 drag radials 4 race rims= twice the $$$. Putting down big power to all 4 and hooking will quickly lead to a broken transfer case ($2700) or the front diff ($900), or both ($3600). F**K THAT! RWD's hook damn good and still launch hard as hell due to weight distribution, just look at my 60' on stock 20" rims and tires. AWD's are 60ing 1.8xx's. Don't get me wrong I "LOVED" the AWD but not for the new realm I'm taking this truck into.

[BraemerZ28]

Just wondering - why not just trade the truck for a 2wd? Sounds like a lot of work to convert.

[willyfastz]

Out of the box AFR's are good but not as good as you need for your 427ci's. The Trickflows are better (imo) than the AFR's but for the money you have to spend on them by buying new rockers and such you could get a better set of heads from Bret B. Pm Bret and ask him about his 245cc Darts you would be very pleased with the performance you pick up.

[JerzBadSS]

Just wondering - why not just trade the truck for a 2wd? Sounds like a lot of work to convert.Not alot of work at all. The trans was out and apart anyway. All I needed to change was the tailshaft, tailshaft housing, and out-put shaft, and then I needed a longer driveshaft which I got a custom billet one with 1350 U-joints made practically for free. I spent $600 on the parts. As far as the rest goes it was just removal which took about 45 minutes with the motor & trans already out. Then I sold the complete AWD set-up for $2000.

Out of the book AFR's are good but not as good as you need for your 427ci's. The Trickflows are better (imo) than the AFR's but for the money you have to spend on them by buying new rocks and such you could get a better set of heads from Bret B. Pm Bret and ask him about his 245cc Darts you would be very pleased with the performance you pick up.I'm not sure who Bret is, I really don't know anyone yet. I never considered Darts, I was never really a big fan of Dart but I'm open to suggestions.

[willyfastz]

Not alot of work at all. The trans was out and apart anyway. All I needed to change was the tailshaft, tailshaft housing, and out-put shaft, and then I needed a longer driveshaft which I got a custom billet one with 1350 U-joints made practically for free. I spent $600 on the parts. As far as the rest goes it was just removal which took about 45 minutes with the motor & trans already out. Then I sold the complete AWD set-up for $2000.

I'm not sure who Bret is, I really don't know anyone yet. I never considered Darts, I was never really a big fan of Dart but I'm open to suggestions.


His screen name is sstrokerace. The Darts have done very good on the stroker engines we've done here.

[wkmcd]

My dyno sure isn't a good advertisment tool. As a few up here knows already it seems to be the lowest reading dynojet on the east coast. But like Jerz said when my cars go to the track they nornally rip the heads of most the cars from some of the other high reading dynos. That's all that counts in my book also.

I don't think Ed Hutching's dyno is any better...but his numbers are real and repeatable.

[Ed Curtis]

The AFR 235/240 heads are close.... Maybe before PRI?

Sorry... but no TFS stuff for me... ;)

Ed

[Black_Knight]

Putting down big power to all 4 and hooking will quickly lead to a broken transfer case ($2700) or the front diff ($900), or both ($3600). F**K THAT!

Ah I see. Yeah for some reason they don't build the AWD systems to hold another 100+ hp than it comes with. Short-sighted if you ask me.

[SStrokerAce]

My dyno sure isn't a good advertisment tool. As a few up here knows already it seems to be the lowest reading dynojet on the east coast. But like Jerz said when my cars go to the track they nornally rip the heads of most the cars from some of the other high reading dynos. That's all that counts in my book also.

Yeah I like the story of two 408's making the same power on your and another local dyno but the guy on your dyno runs a 1/2 sec quicker at the track :diablos[1

[willyfastz]

Yeah I like the story of two 408's making the same power on your and another local dyno but the guy on your dyno runs a 1/2 sec quicker at the track :diablos[1

Yeah like wkmcd said, they're real #'s