KrisR

iTrader: (2)

This is in my C5. Just got it tuned. Tuner spent a lot of time getting everything out of it he could. It liked being a little fat, he suspects his wideband was reading a little rich, going off the 02 voltage as a comparison. He tried pulling fuel out of it at high rpm but it lost a bunch of power, so he added it back in.

Stock shortblock has 78k miles on it. The head/cam setup is about 5 years old. I bought the car recently. It had an LS6 manifold and stock TB on it, plus a modded stock airbox with K&N filter and made 402/385 (with the tune that was in the car). The car does have longtubes and an offroad X pipe. I then added the FAST 92mm intake manifold, LS2 90mm TB, and an AFE cold air intake setup, and then had it tuned. I guess I expected maybe 35rwhp from adding this stuff. I was disappointed to only see a 19hp gain.

I guess my stock cube mild setup doesn't need a FAST manifold?

SAE numbers 421/391, STD numbers were 432/401.

venom ws7

iTrader: (13)

What exhaust? why the pull stoped 6200rpm it was pulling maybe take it to 6500-6600rpm?
I really think with better A/F you can get a little more hp & tq.

I like the TQ curve and the numbers are not that far off with mild H/C I guess I expected 430-435rwhp

KrisR

iTrader: (2)

Pull #25 was taken to 6500. It leveled off there as you can see. Tried less fuel and it lost power so it was added back in. I don't know which catback is on it. A friend said it looks like a B&B? It's pretty quiet. A cutout might help.

KrisR

iTrader: (2)

I should add that my MAF was giving us some issues, and it ended up with a smoother curve (both air fuel and performance) with a speed density tune, which is what this is. The MAF is still in the intake tract though....might pick up a couple hp if I removed it?

Johnnystock

iTrader: (6)

You can expect 35rwhp with a FAST/bigger TB/LID..on a happy dyno.

I picked up 14rwhp with a ported FAST 92/92TB tuned from a LS6/ported TB. Your results sound realistic. 19rwhp is pretty good for easy boltons.

But yeah, internet made me hoped my FAST setup would yield 35rwhp LOL

JakeFusion

iTrader: (7)

I think 15rwhp is about average gain for the FAST 92 over the LS6 even with heads/cam. Those heads aren't the greatest ever, but they are decent. 430rwhp sounds about right for that setup. To hit closer to 460, you'd need better heads, milled to hell, thinner gaskets, and all kinds of little tricks (EWP, roller rockers, etc). It adds up to a ton of cash for a few ponies.

I'm guessing the FAST had a better curve throughout (19 peak but perhaps more in the midrange?). Either way, it probably isn't super noticeable...

DietCoke

iTrader: (18)

small cam, small heads. I think you're right where you ought to be.

KrisR

iTrader: (2)

Thanks, you are probably right. I see a lot of setups that make more but they usually have a bigger cam and 243-based heads.

Side note, I stayed ahead of a c6 Z06 twice last night from 50-130.... That was unexpected but fun.

AutoCruzer

I am no expert, but I couldn't help but to chime in.... At approximately 400+ rwhp you are averaging around $80-490 fwhp.... Now I understand that some people are never satisfied, but to have a streetable LS1 putting out that kind of juice you have done rather well.... You may also be pushing the limits of that engines endurance...

If you were able to even keep up with a late model Z06, let alone stay in front of him you have done very well and maybe should look into forced induction next. Please take it easy out there.... that's a serious machine you
are driving...!

HCI2000SS

iTrader: (2)

See this is why I NEVER trust a certain dyno number! OP your dyno said you made 420, but you stayed ahead of a ZO6 (I assume stock) which is every bit of 420 hp, and lighter. Now on "paper" you should lose, but in the real world you didn't...very interesting isn't it

KrisR

iTrader: (2)

C6 Z06 is lighter than my car? I have a 2000 FRC...I failed to mention that.

KrisR

iTrader: (2)

Thank you. My last car was a turbo '99 Mustang GT with just under 700whp so this isn't very fast to me. But I was pleasantly surprised last night.

And it is very driveable...I can lug it down in 6th gear at 55mph (1200rpm) uphill and it doesn't care, just grunts along.

studderin

iTrader: (28)

number look fine. Most budget heads/cam setups make that, there alot of them out there.

The almost 20whp is good from the fast over LS6 in cuz your TB was unported.
35 is not gona happen, the bigger gains are when people do, 5-7 other little things you dont think about, or then dont tell you. That are 5 little 1-3hp changes done also with the "FAST XX and XX Tb " gains on a dyno..... airfilter, intake tube setup, maff, weather, cutouts, tires, clutch..ect changed too.

Uneverknow

iTrader: (1)

KrisR.. I'm also from mn, who did you have tune the car? And I'm surprised you found a car to race this time of year. Anyways was it just a random car or is there some street scene stil happening, I've lost the street scene after porkys was closed.

bestlude

iTrader: (4)

i think you're right where you should be.. i made 430 with a torquer 2 and the same H/I combo with 4.10s ..

anheuserbusch08

iTrader: (11)

go with a g5x3 cam and port the heads and intake. 440+ easily

BrntWS6

iTrader: (7)

I also got 20rwhp from going from LS6 to FAST 92 with H/C.

reeperz28

iTrader: (1)

Car sounds like it runs strong. If you want more power sell the prc heads and get some aftermarket castings (afr, tfs, prc 215,) and a larger cam. The fast intake really shines after 6 grand. If you sold the heads and cam for 1200 and bouht a new combo you might be out a grand plus tuning. For mayby 25 more hp. Not worth it lol.. 100 shot with a tune 500+ rear wheel is a better option.

Bo's 98 TA

iTrader: (4)

Those are some good numbers for a very mild cam.

Exidous

iTrader: (11)

Those numbers look pretty good to me. Your Tq looks better than mine. I only pulled 375rwtp but I was still using dual 2.5" ceramic cats and a 2.5" y to a 3" cat. Stock pulley and water pump. I have since replaced the y and cats but haven't been to the dyno since. Gears make a difference on the dyno too. I'm running a 4.10.