KorbenDallas

Yup, another "xxxHP with brand x mods" post. I've done my homework on the forum and I think it's possible with the mods below, but I'm wanting some feedback pls! I'm trying to get an idea of hp/cost on C5:

o Vortex/Vararam +10hp
o Borla Stingers +8hp
o FLP system with cats +18hp
o LS6 Intake +7hp
o Dyno tune +10hp

EDIT: I've ruled out power coupler, ported throttle body, higher cfm maf, fuel pressure regulator, etc. mods since they haven't consistently proven to be reliable hp gains from what I've read in the archives. HP/Dollar is the key here.

Baseline dyno on a '99 C5 is ~300rwhp. I was being conservative with the hp above, so would ~350rwhp for the mods listed above? Or would ~340rwhp be more realistic?

Factoring in hp/$ it comes out to be roughly 1hp/$70 for about $3700 invested! :eek: A supercharger comes in roughly at 1hp/$50 but with $8000 invested. Nitrous comes in at the best bang for the buck at 1hp/$10 with about $1000 invested; refills not included!

Obviously I want to keep a factory (extended) warranty or I wouldn't have spent so much time on researching breather bolt-ons. I would consider nitrous, but I'm not very confident about removing the system everytime warranty work is needed.

I'll be in a C5 in a couple of months which is why I posted this. Thanks everyone! :cool:


[Modified by FroDaddy, 12:21 AM 8/1/2002]

kp

I'll let you know in a week or so. Doing:

FLP headers, stock cats have 76K on them so I figured I would just replace the whole mess.

Corsa indy, I like the pro tips :)

LS6 intake, found one off a wrecked 2002 Z28 for a steal :)

TB bypass, worthless to most but I have a dozen or so of those aluminum 5/16" couplers in my toolbox - may as well use one.

Usual TR-55 plugs/magnacore wires left over from my camaro.

180 stat, had it laying in the junkbox. HPP3 just for fans and shift points.

MAFT, should get me close enough on the dyno with so few mods.

Blackwing filter.

I leaked the motor down last week, looked pretty good. No oil in the intake and I have put about around 1500 miles on it and havent used any oil I can see on the dipstick. I'll probably put some new (LS6) valvesprings on to be safe as well. Big investment here was the FLPs, I like the idea of just replacing everything, when I sell the car its easy enough to swap the old stuff back on. I will also be doing a vig3000 converter whenever it cools off out here :/

Should be done by the end of next week, waiting for a kwiklift.

Nate@CorvetteGarage

340rwhp is average for the mods you listed.

thats funny, you won one set of the Baer rotors in our hp contest! i replied to your question minutes ago, and came back!
i thought, FroDaddy? thats sounds familiar! congrats! you dont have a C5 yet??? these rotors dont make good frisbees!

Nate


[Modified by Nate@xtreme, 2:12 AM 8/1/2002]


[Modified by Nate@xtreme, 8:22 AM 8/1/2002]

WALLstAL

Who knows, I had 355 rwhp and now down to to 340! Add new gears and T/C and thats the story?? All I can do is look at et's. :)

Mean Green

I'm hoping to hit that range with the addition of headers, LS6 intake and possibly an UD pulley. Current #s are 326/326 :D with a 12.564@110.21 :D

Of course, I also hope to be deep into the 11s with the above mods and gears/converter/tires :D

ncvetteman

Maybe around ~340rwhp, I think you will probably get more than 10hp from the Vortex/Vararam, but probably less than what was mentioned for the Headers/cats, LS6 Intake, and Dyno tune.

Face

If you get a M6 it's very possible. But with a A4, you'll be around 330-340.

kp

Yes the 3.73s and ST-3500 will show less rwhp on a dynojet then 3.15s and a stock converter. That is if you didnt lock the converter on the dyno, the taller gear will show a little less on its own as well. 15rwhp seems like a little much but conditions change.

Skeeter1

:yesnod:

KorbenDallas

This would be on a M6. Thanks for the replies!

You're right, they don't make good frisbees! These rotors will be my first mod on my C5 when I get it! I've never won anything before, so this is really :cool: (I left a voice mail for you Nate and IMed you as well.)

jimman

337 is the best I've seen, I think if you dyno with that mustage one in FL somewhere you'll probably get it, they are usually 10 to 20 high.

roddog

somebody has the hp itch, get ready and hold on,,,,,just remember on what you are trying to accomplish, quarter times or dyno #'s :)

KorbenDallas

My C5 will be a daily driver so no dyno/garage queen here. So have I picked the easiest & cheapest route to 350rwhp or is there a better way? I think that the LS6 intake would be one of the last mods; if it were put on at all. EDIT: I think I could get close to 350 without it since I think I'm understating the FLP system by about 7rwhp.

Thanks for the replies thus far!


[Modified by FroDaddy, 4:37 PM 8/1/2002]

kp

I'm not going to waste the time dynoing the car stock but I will dyno it after the headers/intake and other stuff. I would be thrilled with 340hp but I have been pretty unlucky with LS1s so far, my best one stock (with just an airlid) was 297 and that was an '01 6 speed car so I'd be happy to see 325.

I plan on doing a blower or heads/cam if the car holds up so I thougt I would get everything I needed to get the most out of either of them first. I paid 150.00 for the LS6 intake, figured it was worth that :)

John's vette

I will hold those rotors for you :yesnod: , it is the least you can do since I helped inspire you to get a C5 and my car was the first you rode in. :)

Horsepower

Where are you buying a 100shot NOS system for 1000 bucks???

JWSchmidt3

My '98 coupe, with 50k "hard" miles, dynoed 340rwhp, 350rwtq with RK Sport headers, Corsa exhaust and Twin-flo, pinging it's a$s off from a GMS MAF and leaking air bridge. I've replaced the MAF with a stock MAF, replaced the Twin-flo with a Blackwing, and replaced the Corsa's with PRT's and I can feel a noticeable difference, but haven't dynoed, but would have to say I'm probably up 10-15 in both categories. Since then, I added 3.90 gears, which I know will lower dyno #'s, but I can run straight up with stock '02 Z06's, on runflats. :cheers:

4DCYKEY

Horsepower increases are not necessarily additive. The combined total will be less than what you have stated for each component. I was hoping for 340rwhp when I made my mods to my M6 (see sig), but only hit 331rwhp and 338rwtq SAE. Good luck.

Viprklr

I am at 330rwhp and 335rwtq minus the LS6 intake and underdrive pulley. I think I could maybe get to 340rwhp with the addition of the two items above and a little tuning. Not sure about 350rwhp. :crazy:

KorbenDallas

We might be able to work something out ... if there's cash involved :p:

I didn't want to get too far into it, so I just threw out a round figure that was accurate. For reference, http://www.xmotorsports.com/performance/ but that's not the Holley NOS system you spoke of. I wouldn't consider Holley NOS brand since the rate their power gains at the flywheel (from what I've read). TNT nitrous systems rate their systems where it counts: at the rear wheels. If I had to think things through, I would guess the system would cost more like $1500+ since you'd want to get a fuel pressure regulator, upgrade your plugs and wires, buy a couple of solenoids for redundancy, guages, maybe upgrade your fuel system (but an LS1 should be okay to a 100shot without it), etc. etc. Hope this helps! :)

Thanks for the replies everyone! So IF I happened to get a strong LS1 6sp and did those mods; it would be more optimistic to say 340rwhp. That sounds fair to me, but it makes the hp/$ go up to 1hp/$90 :crazy: Now I see why nitrous is such a popular add-on!

I was looking through the archives and found a member with a '99 or '00 LS1 with a blackwing (I think) and stingers... and made 330rwhp!! :eek: His HP ratio would have been about 1hp/$23 with about $700 invested since stingers were $500 at the time. But I think he had his MAF screen removed and some spark plugs and wires thrown in there too. FLPs are typically good for 18rwhp, so that COULD have put him close to 350rwhp. But as 4DCYKEY said, hp #s aren't cumulative so probably 340rwhp or mid 340's been more realistic? That was the true inspiration for this thread!

I guess there's only one way to find out if those #s are possible! Hopefully KP can shed more light on this with his dyno. In the meantime, I'll dig through the archives in my spare time to try and find someone who has already done these mods with dyno #s!
:cheers:


[Modified by FroDaddy, 9:10 AM 8/2/2002]