Looks like about 5600 to me, which is still a little higher than stock. Stock curve would not be smooth to 6250 like that either.

Stock M6 makes ~270 rwhp on a dynojet. 1.6 rr + shorties + tuning would give you probably 30 rwhp and move the hp peak up a little, so that's my guess as to what he has.

Still, without knowing what is actually under the valve covers I'm surprised that the tuner would raise the limiter to 6250. You'd think since he's charging 2-3x the going rate for a dyno tune that he'd be more experienced/careful than that...

 

Why raise rev-limiter to 6250 when peak is in the mid 5s? I'd like to know what the AFR is. Looks like its getting close to 14.

 

I think your numbers are that of a very healthy stock rebuild, unless you have a very mild cam on the "383" the guy "put in" and "proved" to you with "receipt."

I'd be pissed off in the event I pulled the heads to find out I didn't get what I paid for.

But you Vette is a very beautiful one. I'd be proud of what I have, epecially for 10k!

Here, there are C4 Vettes all around here for sale and the one with the lowest price is 14k. Its an 88 with a rare "ratty *** interior" and the custom clear coat flake off paint job. Its a POS but I'm sure people with more money than brains would still buy them.

 

I recieved this email from my friend who owns and runs www.speedengineeringanddyno.com and just yesterday did my custom tune with a few hours of dyno time also, I thought it was good information that I should probably post here as well:

Who wants to shift at the power peak? You have to go past it for the best ET.

It's all about area under the curve. More RPM = more area.

6250 is simply not a problem even on a stock LT1.

The revlimiter is like a safety net. Not something you use daily. Just there to catch the revs if you miss a shift or spin past your shift point.

Look at the dyno curves and tell me which one you think is more complete.

I have turned bone stock LT1's to 6800 rpm without issues. I don't recommend it and the stock valvesprings won't last if you do it on a regular basis, but the fact is it can be done.

Air Fuel ratio is at 13.2

Who does dyno tuning for $50/hr??? No one!... Well, maybe the guy that got THREE hp. LOL

 

6800?

When I spoke to Lloyd at Eportworks, he explained the differences between the LS1 and the LT1 and didn't seem real keen on jacking the limiter up too high. I don't recall what he suggested, but 6800 seems high.

 

Looks like a good tune to me, and you should feel the difference based upon the curve.

I would say money well spent.

 

6250 is where mine is now set with the custom tune, very safe. He said he has done 6800 on stock LT1's and it is fiesable, but probably not reccommended with stock springs.

 

My LT-1 is pretty much stock, it has LT headers and 52mm TB. With a custom tune, I netted 291rwhp and 332rwtq. My rev limiter is stock.

I also say money well spent. Only reason to dig any further is to sue. But you got a helluva deal looks like.

 

You might have a small cam but your crank is bone stock.

What a rip, I'd be pissed.

 

There's so much I could say....

 

I agree Diel.

 

Ron............

Would you take what you paid for it???
Plus what you paid for the mods you've done to it??

Let me know.

 

Have fun with your 383 and your $1k tune from the guy who tunes bone stock LT1s to 6800 rpm with no issues. If you are ever in the market for oceanfront property, I can offer you several acres in the Pittsburgh area for cheap...

Seriously though, you got a decent near-stock 94 for $11k, which is not a bad price.

 

Its sad, but sometimes "false and deliberate advertisment" on the engine size and hp of a certain car can cause it to sell faster and more than likely, yield more money. I've known a few dealerships to do that. When I was shopping around the place for my second Integra, the salesman was claiming it was a 2.3L Prelude motor put in by the "original owner". It even said it on the ad...WTF??? Maybe it was the red JDM valve cover...

When I checked the engine code stamped on the block, it said B18B, which is basically a factory non-VTEC DOHC 1.8L motor. I was knowledgeable enough to differenciate between a smaller B series Honda motor and a "big block" H series motor.

No wonder many people hate buying cars from used car dealerships. The cars they sell supposedly have much bigger engines than the new ones.

I bet many people in the past were screwed when they bought a 3rd gen F-body from a guy claiming it had a rebuilt 350 swapped in, while in reality, it still had the original old and tired 305 in it. After all, a small block Chevy looks just like any other small block Chevy because they are mostly identical in physical size...

A guy selling his Camaro can even claim it has a rebuilt 406 in with so and so options in it but really its still a regular base Camaro with a 305. When you test drive it and are disappointed from the lack of performance, you'd know right away that you were a potential victim of "rape."

RAGE ON!!!

 

Looking at the first duno run, and the A/F graph that goes with it, I can tell a couple things:
1, the HP #s look like a close to stock LT1 350
2, the A/F is almost exactly what a bone stocker would blow
3, if it were a 383 with a 350 factory tune, I dont see the A/F #s staying the same
Question; Did the tuner program it as a 350 or 383? The reason I ask is if it is programmed for the wrong size CID or injector flow rate it takes alot more manipulating the VE and PE tables to get it to run right and get the A/F where you want it. The guy tuning it should have known pretty quickly if those 2 settings were right.
Ps the tune was obviously a good one to have that kind of improvement.

 

I believe after taking into consideration the dyno pull previous to going to the tuner man, he made the judgement that it probably was not a 383 stroker, so I'm guessing that he was custom tuning for a 350, but I'm not sure, I gave him all the reciepts and previous dyno runs and told him everything else that I knew and thought might be of importance, and told him to do what he knew had to be done, I drove the Vette through all the 14 pulls in the almost four hour visit at his shop, while he made adjustments.