question about accelleration

[vandor]

> If its before 78 or 79 (not sure exactly) then it has a 4:10 rear

No, 4:10 was up to 1970. 1971-78 was 4.30:1

[vandor]

> Offline acceleration is just slow to me but on the other hand it will smoke a tire..

That is weird. I wonder if the carb is too big and the engine bogs when the throttle is fully opened at low rpm?
In first gear it should rev up so fast that you have to shift into second almost immediately. Maybe try taking off with 1/2 throttle and going full throttle around 3-4000 rpm? May be had to do in first gear.

[baltobernie]

Mike, you and I have approximately the same engine, judging from your description.



...except yours is 200 cc larger. Mine develops 104 WHP. Properly tuned, yours should produce a little more, maybe 115. That would equate to 130-135 SAE HP, about the same as a new Corolla. The Toyota of course has a much broader and flatter torque curve, with VVT and all the other modern accouterments.

Experienced builders who race our cars can see 175 WHP, but of course these motors are absolutely useless for the street.

The Fiat TC was an engineering marvel for its day, but that day was half a century ago. What we can take pleasure in is that, even bone-stock, the Spider can be driven without complaint on modern roads. Very few of its contemporaries can make that claim. Enjoy your car

[TStark]

Consider that brown plugs are not perfect

Insulators should be white, brown means your combustion temps are low. Its a heat engine, heat means power.

Jet by the width of the soot ring at the base of the insulator, with a plug scope or cut the threads off.

I suspect you have a rich condition.

[mikeb1223]

Holy shit!! I figured out the acceleration problem... My 38/38 was out of adjustment. What was happening was all the way to full throttle was only opening the primary barrel and never touching the second... So I made a few adjustments to the arm and made it open about half way now... And Damn night and day difference 1st 2nd and 3rd laying marks... Thanks guys for pushing me to look deeper into the engine and fuel system.. Now the car is very enjoyable.... Now Kias aren't whooping my ass off the line when they aren't trying lmao

[bradartigue]

I'm sorry its a 1980 .. Stripped also of all the smog stuff ... Makes more since with gear ratios I didn't know it had 3.90 gears

Glad you found the problem - are you using a standard electronic ignition from a 1980? If the vacuum capsule is disconnected then you might find more acceleration by connecting it if the carb has the port for it.

Oh and hey wheel spinning - bad idea - don't be tempted. You have a transmission in a Spider that was made for a 60 HP car and a differential to match.