Wily, is yours the grey mondial T coupe? Just saw it weds and it looks fantastic!!! Fernando has me on the list of folks interested in an ECU upgrade but said he was debugging things with that mondial first. Keep us posted!!
Wily, you need to get the torque numbers plotted on that graph. The dyno actualy measurs torque, not Hp. Hp is calculated based on a formula. What I want to see is the torque curve at midrange. The 348 engine has a butterfly valve (balance valve) between the upper plenums to balance flow at certain rpm ranges. Maybe yours is not working so well. If the torque curve is pretty flat, then it is and your shouldn't worry about the Hp curve. Also I'd like to see the A/F curve through the rev range to see if you are running rich or lean at places. Its a good start. If you can get the data DLed in raw format, gothspeed can take the data and do the plots.
Very thoughtful. Now we can keep this on topic. I'll probably start a new thread on our project when this one gets too long anyway. Chips discussion is very important so it deserves its own thread, for sure.
Vvassallo, Here is the graph. For reasons I did not fully comprehend, to get the torque real value, you have to divide the number by the ratio, 4.430 in this case. Again, the thick red curve is my Mondial and the two thinner ones are form another “t”, with K&N and Tubi. Mine has the Euro engine, which I understand has a different exhaust cam profile. As you can see, there is a significant drop in torque between 4000 and 5200 rpm. This is the problem I hope the specifically programmed chip will solve. I do not have the AFR graph but I remember that while its was nicely tappered down, it was like 1.0+ too lean all accross the range, like from over 15 to 13.7. Image Unavailable, Please Login
Thanks, I will try to digest this, but first thing I would do is check my MAF's for resistence. If you have a "t", then your motor is like mine and you can do the adjustment. Check to see what your resistence value is. Check my A/F table in this thread for comparison - and we think it is slightly too lean, so yours is pretty lean if the range you quoted is correct.
NoDoubt, Well I do doubt... We have in Holland octane98. Should I set the MAF at a different resistance? I`ve just alterd them to 383Ohm`s but the engine sounds a bit lean: very slow on the return too idle... Thanks for any light on the subject! regards, Ben
98 octane in Europe is different than 98 octane in the U.S. Different calculations are used in each region. 383 ohms on your MAFs is the factory setting for best emissions and gas mileage. You should never have your MAFs set above that value, but you can use lower resistance values (some of which will deliver better performance) to improve your air/fuel ratio at the expense of emissions/mileage.
Nodoubt, Great! Fast response. I see you have no social life (same here) since you are behind your pc right now... I thought ron 98 means, 98 octane... may be I am beening simple? What should the settings be? (no cat`s, 1/2 exhaust, not really environment friendly driver) Regards, Ben.
The freer that your intake and exhaust flow, the lower you should set your MAFs resistance, but it's all trial and error at this point. We don't yet know "how much" lower for the resistance to improve your air to fuel ratio.
keee, I`ll start lowering the Ohm`s by 5 points and do some driving... I`ll let you know! Regards, Ben
