IFakieZZ

Hey guys!

So I'm thinking about buying a c5 but I can not afford to buy a z06, because overhead cost will make me broke lol. So what modifications are needed to get a regular 6-speed c5 coupe to about 400 horses at the flywheel from the stock 350?
Any other mods i may need to bif Up to hanlde the extra power

Note that i can't turbo, nos or supercharge it!

Signal_Hack

Not sure what otherhead costs you're referring to, but full exhaust, cam and intake with a good tune can see 400 at the wheels

read this....https://www.corvetteforum.com/forums...-400-rwhp.html

Pekka_Perkeles

Well, none, according to SuperChevy Magazine..

" In the baseline dyno run, the stock LS1 surprised everyone by churning out a whopping 400.4 hp at 5,600 and 411.3 ft-lbs of torque at 4,800 rpm."

http://www.superchevy.com/how-to/0701gm-ls1-dyno-tech/

IFakieZZ

Good 😊

IFakieZZ

Thanks!
Where im from tax and Insurance on z06 are almost twice THE normal c5

IFakieZZ

awesome

tblu92

depends om your budget
cheapest way to get close to 400 in order or cost and expected gains
CAI 8-10 RWHP
Cat back exhaust 8-10 RWHP
TUNE 10-12 RWHP
shory headers 10-15 RWHP
LS6 intake 12 RWHP ( if your car does not have one)
1.8 rocker arms 12-15 RWHP

2nd way
ALL the above LESS the rocker arms
mid sized cam - high 220's to low 230's duration at .050 ) lift does not matter LSA 112 25-50 RWHP
Long tube headers 25-30 RWHP
Ported Throttle body 5-8 RWHP

itsslow98

Cold air intake and longtubes will get you there at the flywheel. As long as its an 01+ car.

T5Mika

"Stock" engine with LS6 intake and '98 cam combination, dyno headers, no accessory drive, 101octane fuel with timing locked to 26 degrees.
SAE estimate 335 to 365hp at crank.

FreeC5inAZ

12-15 RWHP from 1.8 rockers? Wow, you must have a very generous dyno.

I'd also like to see the dyno results from a set of long tubes giving 30hp. That is just a ridiculous estimate.

Pekka_Perkeles

Very good point.

No air filter either...and so on..

tblu92

On a STOCK cam it is easy to get 12-15 RWHP with 1.8 rockers there are dyno tests and results alll over the internet Chevy LS1/LS6 Permormance book actually has a dyno test with SLP rockers
Although these were 1.85 rockers they actually made 20 RWHP and 13 lbs TQ . So it is very likely 1.8's will make 12-15 RWHP

As far as LT headers go again there are results from this mod all over the internet and in LS books--They key to getting these results absolutely require a re tune for the LT headers otherwise the gains may be minimal---With LT headers you can increase the WOT timing quite a bit just on the edge of KR
and need to LEAN down the AFR ratio at WOT---The only way to get the AFR's spot on is with the use of a data logger and a wide band 02 set-up--30 is probably the MAX but i would say 20-25 is easy with tuning on a stock cammed engine

FreeC5inAZ

So what you are saying is that LT's PLUS A TUNE will net you 30. That is believable, but that is not what you originally said. You said LT's were good for 30, which alone they are not.

Nice backpedal on the answer, BTW.

Wait, what, did you say you need to lean out AFR at WOT? Are you trying to melt pistons? What is your target AFR at WOT and what is the factory setting?

tblu92

Not a baclk pedel at all EVERYONE knows that with LT headers in prder to ger the full benefit of HP you need a tune--this is common knowledge
As far as leaning out the AFR's at WOT-- again you are mis interpreting what is common knowledge with LT headers--LT's will create a RICHER running engine at WOT which willa ctually make your engine lazy and reduce WOT HP---
As I mentioned using a wide band 02 is the only way to achieve top performance after inatalling LT headers. This requires to lean ot the fueling---Typically all LT headers will make your engine run RICH a WOT with the stock tune--
If you data logged a stock engine after a LT install the WOT AFR will go way rich into the high 10's or low 11's
So leaning it out using a wideband is always needed to get the AFT's back to optimum---
For a dedicated race car you can shoot for something like 12.8-12.9
For a street racer and a D?d car using good fuel you should shoot for something like 12.6 to12.7
For a D/D car I would recc. something more like 12.4 to 12.5 which is totally safe
STOCK GM tuning is in the low 11's pig rich from the factory and after LT;s it becomes even richer into the 10's
The wideband is the true test of what your actual AFR's are
No by leaning out the stock AFR in the 10's you will never hurt your engine by leaning it down-----It absolutely needs it---A wideband will prove these statements

FreeC5inAZ

Wow. Just wow. I'd love to hear the theory on how increasing air flow through an engine causes it to run rich. This should be good. This should be right up there with your theory on why O2 sensors don't work with long tubes and your reasons on why LT's are illegal.

I'm just glad you aren't my tuner.

tblu92

And I am glad you are not my customer--You have no clue what you are speaking of Do you even own any sort of profesional tuning software ? have you ever been trained by GM in computer programming ? I suspect your answers are NO NO NO !!!
\ It's not the increased airflow that causes LT headers to read rich It is the relocation of the front 02 bungs that control all P/T fueling that causes the engines to run rich----If you were a tuner this is common knowledge----Again that is why LT's are illegal in many states as they create rich closed loop fueling I am not going to argue to someone who is un informed-------------------------Spend 20K on profesional EFILIVE commercial tuning software and another 8K in training from both GM and EFILIVE and then tune over 2000+ GM gas cars and trks then I would be willing to listen to your comments otherwise YOUR comments are just un informed BS-----That is a FACT-----

PS Just contact any or ALL LT header manufacturers and they will tell you exactly this NONE of their LS headers are Calif SMOG legal
Includlng :
Stainless Works
Kooks
Hooker
SLP
ARH
Borla
Corsa
PFADT
AFE
B&B
LG
JBA
Of this I am 100% certain -- Before you even step on your dick some more do your homework !!! Then critisize

Pekka_Perkeles

A bit offtopic.

I think I know what you're trying to say, but there is no such thing as rich closed loop, except if there is something wrong with the engine or tune is way off.

Closed loop fueling corrections may be slower because of the location of front narrowband sensors, that I do agree.

But what you're probably saying is the fact that whenever there is a need to add fuel - based on closed loop - and if you at that point go to WOT, then those corrections will carry over. Which ends up overly rich AFR.

Same happens with Cat Overtemp Protection.

As well as stock Power Enrichment ratio.

Anyway, any magazine test without additional data of what was the ignition advance during that particular run, or what was the AFR and if there were any positive LTFT's or anything similar is pretty pointless.

Sad but that's the way how things are with computer-controlled engines.

seebobgo

You will wish you bought a Z06 after you add it up. And it will still not be worth Z06 money.