Ok Guys...I guess..they did finish most of what needed to be done, except the computer edit and one more retune after the computer is reprogrammed....The results before the tuning are not to my expectations...but they are not bad i was told he would be able to get them higher once he has the all tools to edit the computer....He metioned something about timing being 14 degrees or something...and that needs to be adjusted as well....He also recommened i go with 42lbs injectors as well...He's hoping with the edit and new tuning i will be between 375-380 range

The car is going in next week for a final run and then hopefully it will be complete
Well here is the dyno sheet......



http://home.comcast.net/~progrmrgui/...Procharger.jpg


[Modified by LT1Vetteguy78, 5:50 PM 7/2/2004]


[Modified by LT1Vetteguy78, 5:51 PM 7/2/2004]


[Modified by LT1Vetteguy78, 6:31 PM 7/2/2004]

 

Those #'s look pretty good. But, the dyno curve looks a little choppy.

Oh, weren't these guys almost guaranteeing 400 rwhp?


[Modified by STL94LT1, 6:13 PM 7/2/2004]

 

No they never guarinteed me 400hp, they said they have vettes with those kinda numbers...he let me see the Dyno files on tons of cars.....I saw older Vettes putting down those numbers.....ANyways hopefully after the tune..the numbers will increase and the Dyno sheet will look prettier

 

You should definatly see 400rwhp. That dyno curve is all over the place. And 42lb injectors are way too big. 42lb injectors can support an engine with 800hp. For a nice 450-500hp engine all you need is 30lb or 36lb max. I hope you trust these guys to tune your engine, there are alot of hacks out there. Also did you get an air to fuel ratio graph with the dyno, are they using a wide band O2 to help with the tuning?

 

No i don;t have the A/F sheet, i will try to get it tommorow.....And i have no idea if they are using wide band 02....

 

Dont get me wrong, those are pretty good numbers, it just hit me funny that he recommended such large injectors. The spikes in the curve could be the sign of a weak spark also. Plug gap and a good spark are critical to making good power under boost. Keep us posted on their progress. I plan on getting a procharger for mine in the future or a turbo setup. I'ved owned alot of boosted cars and love the feeling.

 

Looks pretty good! I think 30lb injectors would be plenty for your car. Looks like he's getting quite a bit of knock around 5k or so that's why it kind of dips down (that's my guess anyway). You'll pick up at least 25 rwhp with a good tune which would put you real close to that 400 mark you're looking for!

Are you happy thus far with the results?

 

Good news!

Looks like your close to being done

 

I'm not happy with the 361 no.....my expectations were atleast. 375 minimum......But there is alot of tuning to be done...The spark plugs are brand spanking new..they just put them in...I had Denso Iridiums in there but he went with a lower temp spark plug that ran cooler....I only had like 3k on the Denso's.....I was driving the car today...it pulls really nice.....but still for what i paid my expectations are higher....the potential to run 400rwhp is there i just need the right tune....hopefully they get me close....

 

Could someone go over wqith me real quick, comp ratio in rrelation to boost and how it works.....I thought cause my LT1 had a high comp ration the boost is low...Is this correct>???

 

What PSI is that? Maybe my math is wrong, but those numbers at the real wheels = 400/430 respectively give or take a few.....

What were you hoping for 400 at the wheels which is 450 at the crank!

That is 100/100 increase over stock which is not bad, and yes those injectors are big enough to run FI cars.

 

 

Looks like your on your way,
I'll try to explain,
Even though I'm not an expert I do understand how it works. Lets start with the compression ration, I'll make it simple.

Higher the compression ration, higher the risk of detonation.
Lower the compression ration, lower the risk of detonation.
The reason their is a risk of detonation is because compressed air warms up and if the air becomes warm enough it will pre-ignite the mix of air/gas being compressed before the spark plug fires. This is call Knock or Ping, and this is part of the reason why we have a knock sensor on our cars, and this explains why diesel engines do not need a spark plug to ignite the air/gas mixture, they have VERY high CR, its like 20 to 25 to 1.

I'm sure you've heard all about this before, so I won't go into much more details.

Now, imagine having a supercharger witch will bring up your usual, example 5.7 L of air coming into the into to engine TO lets say 8 L, it only makes sense that if you have more air to compress that the air will HEAT up even more and chances of pre-ignition are even greater. This also explains a bit why Turbo charged cars have Intercoolers to cool down the air before it is compressed into the engine. "Imagine forcing already HOT air into the piston chamber and then compressing it to make it even warmer".... can you say BOOM !!!!

So there you go a simple explanation, hope it makes sense and if someone can add on, please do so.... Like I said I don't pretend being an expert.





[Modified by TheStef, 7:12 AM 7/3/2004]

 

But, I would also add that higher cylinder pressures are more likely to detonate too. High comp. + high boost = very high cyl pressures. The parts affected by detonation are; Pistons, usually broken ring lands but as much as holes through piston tops, and rods/bearings. The rod can be deformed from trying to push the piston up in the bore while pre-ignition tries to force it back down (before top dead center- counter rotation). This is also why pre-ignition or detonation causes such a loss in power. Its fighting the rotation of the engine internals. This is also hard on the rod ends and hard on the rod bearings too.

 

One more thing....

When a cylinder pressure is high enough, has fuel added, and is hot enough it will ignite. Thats exactly how a diesel engine operates, and why it doesnt even need spark plugs. The glow plugs are only used until the engine is up to temperature.

 

I am no expert but maybe you should check around about the fuel injectors. I run 30lb injectors on my 396rwhp/400rwtq - 396cu in NA motor.

A couple of guys at work run boost cars (3rd Gen RX-7 TT and Mustang 4.6 TT). They are pretty knowledgable and have been trying to talk me into going to boost. They have been saying that boosted cars need more CAPABILITY on the injectors than a NA car for the same amount of HP.

We did the numbers a couple of times and they were suggesting 36lb-42lb on my motor with 8lbs of boost.

You've got a good start now. Get the tune on it and get that wideband O2 reading. Good luck!

 

Sorry if I just didn't see it in your sig file, but you have an aftermarket ignition box? That dyno curve is up and down like crazy, one possible cause being ignition problems. With the increased cylinder pressures it may be blowing out your spark.

It could be pulling timing too. Whatever is doing it can be fixed, and when it is it'll drive like a whole different car.

 

Just a short note...I been driving the car around...It run really good...It makes noise under the hood though, like squeaky belts..and also a high pitched sound......But it pulls really fast off the line....Definitly a huge difference....i'm actualy impressed...but still want higher numbers for what i paid($6800)

 

The noises you are hearing are normal for a Procharger. They are probably the loudest supercharger on the market. Don't worry about the #'s right now, when they put a good tune on it next week you'll get the #'s you were hoping for.

 

That noise is used to warn other cars.