Nice...

 

With that reply from the mail order tune I feel safe in assuming who did your tune. Proabbly the mail order tuner with out a dyno to work with doing numerous combo's...but its mechanically wrong when they go bad.


Great numbers!!!!!!!!!!!! You should hit 410+ rwhp

 

somebody said 2.5 inch pipe is good for 500hp? is this flywheel or rearwheel? what is 2.75 rated for? isnt powereffects 2.75 inch? are some of you guys running bigger than that with PE? how? are you running big pipe untill you get to the mufflers? wouldnt that creat turbulence? im sorry for so many questions. just trying to understand

 

the car starts right away now, and idles good. Very nice... I happy with the results so far.

yes, "mechanically wrong" His thought was bad O2 or injectors, vac leak, etc… I think the tuner made a mistake in the tune because my VIN wasn't inputted correctly. I plugged in my scanning software it came back with a different VIN. If he entered the wrong VIN then he might have made another mistake someplace or he mixed up computers and sent me someone else’s tune?????? Don't know. All I know is the car wouldn't run. Gray smoke, black smoke... I had to pump the gas pedal to get the car to run and I had to play with the throttle to keep the car from stalling.

It seems mail order tuning is a hit or miss. Sometimes it works and other times it doesn’t.

 

 

never assume!! This mail order tuner HAS a dyno and he suggested I bring the car to him. The distance and the fact I don’t have a truck to tow, I decided to take it someplace closer.

 

The person with the 3inch back to the power effects sent me pictures. I'm not sure if I'm allowed to foward them on or post them. If he says it's fine I post or foward them to you.

 

Interested in your results when you pick the car up...keep us posted!

 

post them if you want. I would, just dont have nowhere to store them.

jeff

 

what are 2.75 inch pipes rated at then if 2.5 are rated at 500. is that flywheel? rearwheel? somebody help clarify all this for me

 

I went by the shop today and the max rwhp was 395. The rwhp moved up a little around 3000 rpm. John said with 3inch exhaust all the way back I would make another 15 to 30rwhp with this setup...

Car starts great now, idle is good. The exhaust Doesn't smell like a gas can anymore. Black smoke/ dark gray smoke is gone.

John will tweak the tune once I get the exhaust worked. Doesn't make sense to tweak the program if I'm going to change things.

 

Good deal. That's more HP than a lot of 383s produce, including Lingenfelters. Of course starting with an LT4 base gives you a leg up but that's a strong engine. Now you'll wish you were back in Germany to run the autobahn and the Nurgburgring with it.

 

Yes I really WISH, I bought the motor to drive overseas but things change. Maybe I can ship the car over for a few weeks!!

I have an appt with Robert for next month. i hope to find some extra power with the new exhaust.

As for which side is which on the dyno sheet, AF. The red line #2 is pass and the blue line #1 is driver.

Robert

 

That's interesting. My chart looks like your first pull, except mine start out equal. The driver side is leaner and less erratic than the passenger side. I wonder why the difference? I replaced both O2s when I installed the headers.

I'm getting a tweak in Va Beach on Monday so this should be corrected on mine.

 

Robert -- Very impressive numbers! And thanks for posting those photos to the GSR Photo Gallery.

I'm interested in your project since I have just undertaken a similar stroker project based on a 396. Mike Norris is building mine to be complete by the end of the month. I'm hoping for similar results... CNC heads & intake, 30# injectors, 58mm TB, Comp 306 cam, Lunati race crank, H-beam rods, JE pistons (~ 11.25 CR), Meziere HD elec water pump, Fidanza alum flywheel, MSD 6AL, TPIS long tubes, Random Tech bullet cats, Power Effects, 4.10 gears. Whatcha think???

How about sharing those dyno results with your Grand Sport brethren? You know we have our own Dyno Page.

It is commendable that you don't want to start a flame war over your mail order tuner. The one I'm thinking of does very good work but let's face it, nothing can beat an on-site dyno tune!

Are you still in Germany or back stateside yet?

Jeff -- You are welcome to post exhaust photos on the GSR Photo Gallery. Do you really think a 3" exhaust that narrows down to the 2.75" PowerEffects capsules at the rear would have any benefit over an all 2.75" system? Just wondering if it would be worth the expense.

 

On Friday during the first 3 pulls I had a new Bosh O2 on the driver's side and an older AC O2 on the pass side. John replaced the old o2 with a new AC O2 and the lines moved closer together.

On the passenger side the little gray plug that holds the front o2 to the piece of metal on the block broke and the 02 wiring harness burned on the headers. This happened a few years ago. I cut off the damaged wire on the wiring harness and used a GM O2 harness repair Kit.

Most likely there is a wire resistance issue from the repair which could be why one side is different. having the same brand of 02 might help as well.

John said a .5 split or less is ok. I have .5 or less across the board. He said another possible cause for one side different then the other is injectors.

 

Robert -- Very impressive numbers! And thanks for posting those photos to the GSR Photo Gallery.
---thanks... I was hoping for numbers closer to 500 at the flywheel but I think I can get close with a 3inch exhaust.

I'm interested in your project since I have just undertaken a similar stroker project based on a 396. Mike Norris is building mine to be complete by the end of the month. I'm hoping for similar results... CNC heads & intake, 30# injectors, 58mm TB, Comp 306 cam, Lunati race crank, H-beam rods, JE pistons (~ 11.25 CR), Meziere HD elec water pump, Fidanza alum flywheel, MSD 6AL, TPIS long tubes, Random Tech bullet cats, Power Effects, 4.10 gears. Whatcha think???
--- I think your heads will flow a little better then mine and with more cubic inches you will easly make the 500hp mark.

How about sharing those dyno results with your Grand Sport brethren? You know we have our own Dyno Page.
---Sure, My car is already up there with 355rwhp from a stock 350 with a LPE top end kit.


It is commendable that you don't want to start a flame war over your mail order tuner. The one I'm thinking of does very good work but let's face it, nothing can beat an on-site dyno tune!
--- IM me the mail order tuner's name.

Are you still in Germany or back stateside yet?
---I moved back 3 months ago... I've been really busy working on the car, new house, new job, etc... I would like to attend the C4 bash next month but not sure if I have time....

You are welcome to post exhaust photos on the GSR Photo Gallery. Do you really think a 3" exhaust that narrows down to the 2.75" PowerEffects capsules at the rear would have any benefit over an all 2.75" system? Just wondering if it would be worth the expense.
---In my case I bought the EM long tubes, and random cats with 2.5 inch pipe for a corsa system. I didn't know corsa used 2.5inch were the stock is 2 3/4!!!! Since I have to change all of that i might as well go 3 inch all the way back. I just ordered power effects 3inch flanges for the PE mufflers.

 

Hmmm....that got me thinking so I called Power Effects and talked to Joe. I am getting some 3" adapters sent to me so when I get it changed I will let you know. Along with the 3" pipe, I also went from 2.5" cats to 3" cats, ditched the resonator for a x-pipe....it made it ALOT louder and seems better on throttle response. I will send over my dyno sheet and exhaust pics to the Registry , your list on your 396 is alot like my build.



jeff

 

How much of a power increase did you see from the 2.5 inch cats to the 3 inch cats with the x-pipe. thanks

 

After I had the exhaust work done, I went back for some more tuning and went from 391 RWHP/393 RWTQ to 413 RWHP/399 RWTQ. Look in my corvette photos<------ I have my dyno sheet there.

jeff