OSP

Interesting comments! I considered buying a GT or S4, though my S is in such great condition, I feel it would be difficult to find one is the same condition without a huge investment. That said, I am willing to spend about $3 or $4K to achieve stronger performance for urban driving, meaning speeds from 0 to 40. Getting some growl would be a nice too…

I know that the car needs some fine tuning with the AT and perhaps timing, though I am having issues finding a knowledgeable mechanic that is willing to do this type of work. Right now, the car would not lay rubber if my life depended on it... it is even a bit slower with 2 or 3 strippers in the backseat.

So along with the fine tuning, I am thinking about upgrades to increase the off the line performance… I don’t think NOS is the answer and I am not sure about the X pipe as I believe that the 84 has a single exhaust? Turbo could be very interesting, further thoughts?

Thanks for the info guys!

Lizard928

A better exhaust and standalone EFI would be what I would do first.

terry gt

Have 16V cams/heads/header set up for sale . Info and pictures in a thread that starts with 16V performance . Vettes are for Girls ,check my signature

Lizard928

Didn't Brendan want a Vette........





Just sayin.....

danglerb

NOS is HP crack. For less than a grand you get a tank that needs storing someplace, plumbing into the intake, and some kind of controller. Starting with a 220 flywheel HP car you could add around 100 hp, but you only get something like a dozen or two runs per tank of giggle gas. So a small payment to get a taste of HP, then regular payments each time you use up a tank.

The way I drive my Euro, which would still be faster than a 4.5 AT with 100 shot of NOS, I would burn through a tank every day or two.

The answer you don't want to hear is that nothing practical is going to make your early AT fast around town 0-40. Its the reason early AT cars sell for very reasonable prices.

Chances are good the first time you drive a 5 spd or even an S4 AT you will never be happy with less.

That said, exhaust is where I would start, and when I say X I mean X or Y whatever fits your model.

Daniel Dudley

An uncorked 4.7 is a pretty spunky motor. If you register the car in NY, ditch the cat and get a free flow muffler. Shift the tranny manually, and keep it in the powerband when you want power.

Also consider that the transaxle is in the back of the car, over the rear wheels. This is for traction, and it makes it harder to spin the tires. Some people would tell you to keep your foot on the brakes, and rev the motor before launching, but I don't do a lot of that myself.

There are some pretty nice plug and play supercharger kits out there for your car, but you have to pay to play. Speed costs. How fast do you want to spend ?

OSP

I agreee, the free flow and the super charger sound interesting.... As for buning out, it is not that I want to be an *** and lay rubber everywhere, I mentioned it simply as a means to demonstrate how slow the car is off the line. Does anyone know of a mechanic that could do this kind of work within a couple hours of buffalo, ny? thanks

zoltan944

well, $4k isn't getting you a supercharger, but thats okay.
I would go with headers, x-pipe, and dual side exhaust (like the 85-86 and euros)

without shopping around or anything just linking with full pricing:
headers
http://www.928motorsports.com/parts/headers.php
$700
x-pipe to go with headers-
http://www.928motorsports.com/parts/headerxpipe.php
$430

and get a dual exhaust built... That should be 30-50 hp at least and be a substansial gain to what you have

NOS isn't worth it, especially for you. Its like renting horsepower, I would rather save up and get things that gave me a return on investment ALL THE TIME

Brett928S2

Hi

Sorry but you are wrong ....he is NOT going to get 30 - 50 hp from ANYTHING he does to the exhaust system...

He MAY get 15 to 20 MAX....but I doubt even that much with the early engine...

And Nitrous would probably be ideal for him for the occasional blast away from the traffic lights.....

All the best Brett

Landseer

My 84 USA auto burns rubber from a standing start in gear from idle. It has stock exhaust.
The 85 and 86 do not.

I think somebody upgraded the torque convertor on the 84.
It had some weld marks on it.
(Its the red car USA with Euro fenders that Stan Shaw rescued a while back. But all he did was put a new timing belt on it.)

Tampa 928s

My 85 Euro has enough power but when I get into my 86 S/C it's a whole different ball game. The Euro has an X-pipe but thats about it, not sure what else would give a good return on investment.

shmark

I've got the same engine and already going down that path. I preferred the early body style, the 16v engine and the larger 4.7l displacement, which dictated the years I looked for.

1. Cat-back exhaust: $300 or so worth a few hp, but sounds like 400.
2. Y-pipe: $300 and worth a few more, sounds like 500.
3. Cross-pipe: it's an 84, not an option unless you replace everything and even then not a straight fit
4. Headers: $600 and worth more. With all 3 exhaust parts you're looking at 20-30hp gain and a loss in low range torque. But what a sound!
5. Euro intake - throttle body, plenum, pipes, maybe a few hp, not much benefit without the next two.
6. Euro cams - definitely worth it, with the intake 20hp
7. Euro heads - minor improvement after the cams, another 5hp

There's at least one dyno-proven 4.7l car here with the headers, y-pipe and cat-back, euro intake a cams, making 250+ at the wheels. That's a 50hp gain, maybe more.

Or you could just go buy a euro engine, rebuild it carefully and use a modern EFI and ignition system. That should be good for 300+ at the wheels.

If that's not enough there's giggle gas, but then you've got to worry about where to put the bottle and filling it up, just not for me. Next option is supercharging which will cost anywhere from $4-8k depending on what you're doing and how much you can do yourself. Gains 100-200hp. Turbocharging is a bit more money than that with similar gains. The difference is worth pages and pages of debate. Then there's the stroker engine which means you'll need a different block and will cost $20k minimum.

And beyond that is the stroker with ITB, methanol injection, sleeved cylinders, coolers and you name it. Louie Ott just made 595hp with his 6.5l ITB engine, Mike Simard made 640hp with his 7.0l sleeved ITB engine and there's at least one more n/a car making more than that. And I'm pretty sure there are one or two north of 700hp with heavily boosted engines. Now we're talking serious $$$$$$$$.

How much is enough?

911tracker85

sorry for the late posting, not sure it adds anything to the thread. unless I missed it, advancing the timing mentioned in the link is the only item I did not see in the thread. I had seen a posting recently about gas octane ratings based on MY and US vs Euro spec. that included the comment of higher octane if you advance timing on a US spec. so far I have only installed a Y pipe due to an exhaust leak on the cat. once I get some other deferred mainteanc done, will be re-reading this post for affordable Ideas. of course most of my perf upgrade money goes into the 911 DE track car.

http://forums.roadfly.com/forums/por...010538-10.html

danglerb

Early Euro AT came with a 2400 rpm stall torque converter, US is 1950, which would explain a LOT.

928SS

yep, when I had my OEM converter set to 2300 brake stall, it came off the line like it had 50 more hp.

that was after a chipset, exhaust, all the foo-foo tuning stuff. made more diff than everything else combined. was also the cheapest thing I did w/my u boat.