Why is my SD so FAST?
 

I Just did a 0-60 test on as level a ground as I could find. it's a little up hill actually. and it turned out 9.55 seconds?:eek: I thought these cars were supposed to be in the 12-18 seconds. it takes a second or so, to really get moving, then it PULLS HARD and shifts solid, when I get up to 40 it really gets LOUD and then poof I am over 60 MPH. now I know the overboost is disconneted, and my transmission is JUST rebuilt, but I am suprised at the time.
I can also easily pull 85 (*as fast as my 82 Speedo goes) on the highway. I have never had any problems passing anything, and my fuel economy is pretty good.
any ideas why it's so fast? :D
possible speedo off? I will verify on mile markers on the highway soon. I also have GPS on the laptop, so I can see what it thinks I am doing.
John

I once saw a guy take off like a rocket ship in new york state once with one of those. What was suprising is there was not even a lot of smoke. He was on a parking lot next to a highway. I initially thought he must have been a gas car. But the right label was on the trunk. Anyways the help to slow it down is available here for the asking. I would get the overboost functional. No sense taking risks. It could evolve into a head trip. Edit: sorry I was reffering to an 86 or 87 with the alloy head. I just automatically thought that was what was meant.Until I re read the post.

It's physically impossible for an SD with a 617 to achieve 9.55 seconds in a 0-60 run.

You'd need to have about 165hp or so.......more than a 603........and there is NFW you have it.

I recently ran the SD with a G-Tech Pro and achieved 12.7 seconds in a 0-60 run......and that's a decent time for an SD.

The SDL's run about 10.75 seconds.........or so.

A 603 with an intercooler and the fuel turned all the way up can dip down to about 8.5 seconds or so. This engine has an output of 200 hp.

that is more what I was thinking,
 

so do you think my speedo is off that much? I will report back when I get the GPS online and see what it says.
thanks,
John

.........well, it's either the speedo, or the stopwatch........;)

For all you guys know the PO extensively modified the IP and is running massive boost.

.........a definite possibility..........you'll get about two runs to 60 mph before a hole appears in one or more piston crowns...........:mad:

Maybe a km/h speedo :)

Sixto

What size tires do you have on it?

14" 205 70r
 

I don't belive it has been modified for massive boost, but it sure does pull!

How did you time the run? The speedo is probably off. Unless you have an intercooler and have tuned the heck out of the thing, that time is impossible.

Their is NO way to get one of these cars in the sub 10 second range without an intercooler. Sorry can't be done, you would melt the pistons.

sorry, i agree tech error or speedo error imho

unless you are running a 390 rear.

tom w

congrats
 

congrats, i love it when someone does the impossible...
good for you... i believe you....

Best I have done on my 300D turbo is 11 seconds (tried this 3 times and came out consistent). But that's with a slightly modified linkage. Turned it back to the way it was and I'm back at 13/14. Same with the fuel consumption from 22 (modified) to 25 (normal) in mostly city driving.

There's a thread somewhere on how to check if the overboost protection relay is working or not.

My SD can pull to 60 in around 12.1 seconds max on flat ground, and easily hits the max speed of about 113mph.....but to do it in 9 seconds would be intense, our van has a 170hp gasser and it can barely lug itself to 60 in 10 seconds without blowing rods @6700rpm and having parts fall off. ;) :D :eek:

Our '83 hauls harder to 60 than my SD (has a bit stronger engine), but it has a slower takeoff in the first 10mph or so (alda probably) and I estimate it about 12.3-12.5 seconds to 60. It also has the modded tranny that does the "slipshift" during the 1-2 gear change, so it looses some acceleration time there, mine is the older style and just SLAMS it in. :D