hi! welcome to the forum

the 90hp version was only available in the early grande punto, the difference between the 75 & 90 version is a variable geometry turbo, aparrantly the 90 has a lot of turbo lag.
the 75 can be remapped to about 100hp.

Thank you for the warm welcome and the information. I have been searching the forum and found a lot of interesting threads. But I cant fined many people that have pushed these engines past a general remap. Does any one have any recommendations when tuning these? I am guessing that if you want to go over 100bhp your looking at a larger turbo. How about the charge cooling? What is it like on these?

PS sorry for got to ask what brand of turbos do these use? Thanks

they can go past 100hp on the standard turbo (i don't know what make they are) but they then smoke heavily, and ind kit and uprated exhaust would reduce this,
there isn't much info on tuning the engine as most go for the 1.9 model

you can remap a MJ 90 up to 115bhp quite safely, the diesels also loosen up with mileage so don't start with a showroom model (you could also pick up a MJ 90 with the 6 speed gearbag). The early ones are getting close to the end of there warranty so these might be a better bet to start messing around with. I know once mine is out of it's warranty it will be off for a remap.

Also remember the MJ engine is also provided to other car makers so if you are looking at doing more than a remap then you might want to check if people have done with other makes

Im pretty certain the turbo in my GPS 130 is a Garrett model. I should think the turbo on the smaller engines is also manufactured by Garrett.

As for the VGT 1.3 having bad turbo lag it should still be better than the standard geo model (75bhp).

You can get the GPS 130 model for good prices these days so why not go for one of those and remap it to 170bhp?!

Thomas Hougham said:

Hello. I am totally new to this fiat thing but not new to tuning at all. I am contemplating having a play with one this year and so have a few questions. I am just wondering if any one knows what the difference is between 75bhp models and 90bhp models to make there difference in power. For example is it the turbo spec or cam profile or whatever. Is it possible to swap parts from one engine to another to upgrade it? Or how hard are full engine swaps? If you are planning on tuning it further does it really matter what engine you started with?

Many thanks

Click to expand...

Please see the ItaliaSpeed website which indicates that the fixed vs variable geometry turbo is not the only difference between the two engines. The website is well worth a look in any case.

http://www.italiaspeed.com/new_models/2005/fiat/grande_punto/engines.html
http://www.italiaspeed.com/new_models/2005/fiat/grande_punto/technical_specification.html

Enjoy!

Mad Mike said:

Please see the ItaliaSpeed website which indicates that the fixed vs variable geometry turbo is not the only difference between the two engines. The website is well worth a look in any case.

http://www.italiaspeed.com/new_models/2005/fiat/grande_punto/engines.html
http://www.italiaspeed.com/new_models/2005/fiat/grande_punto/technical_specification.html

Enjoy!

Click to expand...

Ooops! Having examined the text more closely, I think the differences quoted are of the engine developed for the GP compared to the previous 1.3 diesel engine. The detailed spec. of the 75 and 90 BHP versions appears to be the same except for the turbo.

Sorry about that.

you will want to try and get hold of the 90bhp variant with the 6 speed box then as this has better ratios and I would hazard a guess is stronger.

ahhh another 1,3 tuner
have been looking into this for years now!
im going to upgrade turbo on the 70/75hp model (kkk kp35)
also im installing a front mounted intercooler.
further more i needed a better clutch and got one made special (sintermetal)
im furter more trying to contact bosch for more info about the injectores can handel around 130hp...

well i have been asking around alot ...
the difference on the 2 engines are more than the turbo:
Larger injectores
another fuel pump
VNT turbo (bv 35) (as i recall not the 39)
Reshaped combustion chambers
lowered compression
and of corse another ECU

the problem i think were facing is that the engine cant blow anything up largere than a tea cup ;-) so an aftermarked turbo like the GT2554R would still be to big (or so they say) have been making some compressor maps over the turbo and what kind of exhaust the 1,3 engine makes. And it does not look so good...

well every company "almost" say its almost imposible... but what the fu.. im gonna try it anyways.. im installing a GT1749V (vnt style turbo) from a 136hp HDI or 110hp its the same turbo. hope to see 130hp and hmm 200+ NM (limmited by the transmission) they say the transmission can only hold about 150nm... (this is for the panda 1,3)

have alot more info but if you want to know more catch me on my messenger( polle999@hotmail"."com) remove the ".

Really a lower compression ratio on the 90? that might go some way to explaining why the 90 suffers poorer off boost performance than the 75

Which series are you looking to run this in - guessing it's some form of motorsport if there are regs to stick to.

Just found this thread and I'm unearthing it again!

I've got the 90bhp 1.3 MJ Grande Punto and the lack of punch below about 1700rpm is quite annoying! It has loosened up a bit as the miles go on but it could still be a whole lot better...

I've also read on local forums (in Portugal) that although the turbo fitted to the 90bhp is a variable geometry model, the 1.3L engine can't produce enough exhaust flux to get the thing spinning properly below 1700rpm so all you're left with is the crap torque of a non turbo 1.3L diesel engine!

People who've had them remapped to 105-115bhp with 230NM+ (unfortunately, beyond the gearbox's spec!) torque say that this does improve the bottom end but the engine belows out quite a bit more smoke.

What were Fiat thinking when they dumped a big turbo like this on a small 1.3L engine?!

TheJackal said:

Just found this thread and I'm unearthing it again!

I've got the 90bhp 1.3 MJ Grande Punto and the lack of punch below about 1700rpm is quite annoying! It has loosened up a bit as the miles go on but it could still be a whole lot better...

I've also read on local forums (in Portugal) that although the turbo fitted to the 90bhp is a variable geometry model, the 1.3L engine can't produce enough exhaust flux to get the thing spinning properly below 1700rpm so all you're left with is the crap torque of a non turbo 1.3L diesel engine!

People who've had them remapped to 105-115bhp with 230NM+ (unfortunately, beyond the gearbox's spec!) torque say that this does improve the bottom end but the engine belows out quite a bit more smoke.

What were Fiat thinking when they dumped a big turbo like this on a small 1.3L engine?!

Click to expand...

I had a Dynamic 90 Multijet and loved it to bits. The turbo lag didn't bother me once I was used to it. In the UK this 90bhp engine is (sadly) no longer available for the GP in the UK but there are other Fiat models using it. The engine is also good enough for Vauxhall who put it in the Corsa.

I'm glad you have picked up on the gearbox spec. Judging by the experience of others on this site who have put larger diameter wheels on their GPs, gearboxes are not indestructable!

The Grande Punto model I've got is called, over here in Portugal, the "Grande Punto 1.3MJ 16v Sport" which means its equipped with the 17" wheels plus a whole load of other extras like ESP. This if course stupidly impacts overall performance because of the larger wheel size's rotating mass!

The 90bhp 1.3MJ engine produces around 200NM of torque whilst the 6 speed manual gearbox which is mated to this engine can handle a "recommended" maximum of 230NM so you can't push it too much when it comes to a remap:

M20
Center Distance: 181 mm
Configuration: W-E, 3 axys
Max Input Torque: 230 Nm
Lenght: 332 mm
Mass: 45 Kg
Reverse synchronized

What breaks in the gearbox on the 70-75hp models? I know the rated NM is about 150nm on these in the panda.! but what do you think the rating on the uno turbo was? i dont know but i recon fiaqt would have said WAY less than the tuned uno`s have today.

do you have any curves over the 110hp+ remaps i can see?

i have desided to change turbo.. first off i was going for a gt1749V but the exhaust housing is gigantic, now i have a 1,9 105hp turbo 1544H. so om going to make alot more power (i hope) was looking at a punto gearbox and i think its about the same(not the part that connects with the engine) but the small box at the end with all the mecanics inside! maby changing over for one of thoes.

more air and cooler air should eliminate the smoke.

How fast do a remaped 1,3 to 110hp go? 0-100.. and who did the remaps?

fraguzz said:

What breaks in the gearbox on the 70-75hp models? I know the rated NM is about 150nm on these in the panda.! but what do you think the rating on the uno turbo was? i dont know but i recon fiaqt would have said WAY less than the tuned uno`s have today.

do you have any curves over the 110hp+ remaps i can see?

i have desided to change turbo.. first off i was going for a gt1749V but the exhaust housing is gigantic, now i have a 1,9 105hp turbo 1544H. so om going to make alot more power (i hope) was looking at a punto gearbox and i think its about the same(not the part that connects with the engine) but the small box at the end with all the mecanics inside! maby changing over for one of thoes.

more air and cooler air should eliminate the smoke.

How fast do a remaped 1,3 to 110hp go? 0-100.. and who did the remaps?

Click to expand...

Much of the original spec. can be seen here.

http://www.italiaspeed.com/new_models/2005/fiat/grande_punto/technical_specification.html


I think there is little point in remapping a 1.3. The engine already delivers respectable power for a 1.3 diesel. There will always be a delay before the turbo kicks in and the 1.3 non-turbocharged performance will be relatively poor. You would be much better off investing your money in a more powerful, standard version.