131mirafiori forum

hi every one,
me car is a 1978 fiat 131 1600tc 4 doors, current top speed 200km/h running with a dcnf 40 carb, using 4 2 1 exhaust manifold and a bit port and polish on a cylinder head. can you guy tell me how to make it faster maybe up to 220km/h or more. is it need a fast road cams and dcoe carbs.
your ideas are welcome and thank you very much.
selem.

get a diff with longer ratio. from diesel preferably.
or bigger diameter wheels

BIG turbo will do the job.  Then maybe good for 250km/h!

You also can drive it on the TGV, saves fuel and you reach over 300!

AS the American's say 'you can't beat cubes' (or cc in euro terms)

A basically stock, 30+ year old Fiat 1600 that indicates 200Kph road speed. I'd be looking for a more accurate speedo!

Or is there a 1300 rear axle mounted? Just asking... ;)

yeah, that might be it!

Why? What a rear axle from a 1300 has to do anything with the speedo?

Have that axle under my Abarth replica together with tuned 2000 TC and Racing gearbox. Very fast acceleration, the revs go up, but top speed is 160.

Speedo is mounted on gearbox. Every 131 has it's own speedo wich is in line with engine, gearbox and rear axle.

I know that but he says that he reaches 200. So what effect a 1300 rear  should make?

and number of teeth on speedo pinion in gearbox is matched to number of teeth on diff.
1,6 standard diff must have longer ratio than 1,3 diff so if you install 1,3 diff and leave 1,6 speedo pinion in the gearbox you'll get higher than real speedo reading for pecentage that 1,3 diff is shorter than 1,3 diff.
example:
standard lada 1,5 diff is 39/10
standard lada 1.2 diff is 43/10
diference between the two is roughly 10%
installing a 1,2 diff into 1,5 car will give 10% higher speedo reading, although real max speed will be 10% lower.
result - speedo is showing 200km/h and you're actually going 180.

OK.Now I get it ;) Thank you djape

oh, one more thing: you'll need 10% more engine revs for same speed.
if original 131 1600 was capable of 180km/h on 6.000 revs, now it would need 6.600 for same speed.

i've had 43/10 diff in my fiat powered lada for a while and it would do max around 170km/h but on 7.000rpm

wheel size is also a factor
with bigger than standard wheels you get lower speedo reading than real speed ad vice versa

I have a 10/39 on my auto 1600 TC. I think that in the cars specs is the the one that is supposed to be. But I,m not sure since the car was third hand to me. Can you find out if its the right one?

no idea. if it was 132 i would know but i'm not expert on 131

Anyway thank you for trying. Back to the main theme. Selem maybe some competition camshafts and bigger twin carbs should do the trick...

There's a lot you can do to get more Bhp from your engine. I know it's possible to get 230 from a Ritmo 13o TC engine. It was done here in Holland. Just for information, I drove the car and it was a drag to handle. It was spinning in 3th gear. Front was all over the road, to say. Anyway, you shouldn't have that problem since the Abarth cars had as many horsepower.
You'd have to exchange a lot of parts to get that far. And it will be expensive too.

Hay selem,

           Do you have to keep to the 1600?  everything you do to the 1.6 will fit the 2.0Ltr and give you far more usable torque. Head, cams, carbs (need re-jet)  If you decide to change the engine, remember the pistons from a 1.6 when put straight into a 2Ltr raise the compressions = more power for free, and make all your other stuff work even better.

           Regards

                    Roger.............

P.s  done this, you should get 130mph+  and it will push a 3.5 diff

ya I think so competition camshaft and twin carbs is a easy trick.
toad,
in year 2000 I've already put 2 liter engine but have bad luck the engine always trouble than after few year already fade up and thrown away and put 1600tc till now.
from my experiance 2 liter engine doesnt match with 1.6 rear diff and feel like not enough gear to running :) somemore cornering feel not stable cos of heavy nose but this not big issue ;D
thanks all for info.

Selem,

Try to get hold of a 1800 TC. That's the best one they made. Problem is only that there aren't that many as 1600's or 2000's. You can push the 1800 harder.

Use the 3.5 diff and make use of the 2Ltr Torque,  or run the engine to 7500- 8000,  and run a 4.1   A good big'n will always beat a good little'n

 Catch you later

P.S  Toad went up against an 1800124 sport(Lighter weight)  with its 2Ltr

                   He Lost. ;D

See ya

     Roger..............

the 3.9 diff is the better one i found on 1600tc and also 2000tc

will consider your suggestion. already found 1800TC engine from 132gls ;D will updated the progress later.
thanks.

So have you done 280km/h yet with the 1800? :-\