I'm testing my EGT gauge in 5 gear at 4500 rpm 190km/h make 870ºc. It's normal? My car is a grande punto 1.9mjtd 8v upgraded with KKKBV50, actually runing at 1'4 bar boost and 80mm3 ( tuning map for old gt1749MV) Egt sensor is fitted on exhaust manifold like the photo. What do you think? what is the maximum EGT temperature for KKKBV50 ? The new tuning map going to do 1'9bar boost and 100mm3 of fuel, rail presure 1750 bar and lamdba 1'05.
EGT temperature
1 - 20 of 30 Posts
Joined
·
1,951 Posts
In ECU software, EGT is controllable by AFR, injection timing and injection timeframe length. Each of these has it's own pros, cons and limits. Often EGT lowering methods go against power requirement. So the goal is to find good compromise.
I've heard the limit temperature of Garrett GT1749V turbos is 850ºC. Don't know what's the BV50 one, but I suppose it's higher as the BV50 VGT turbos are also used by petrol Porsche's.
There are some videos/stories around on the internet of higly tuned diesels, where EGT went upto almost 1000ºC.
I've heard the limit temperature of Garrett GT1749V turbos is 850ºC. Don't know what's the BV50 one, but I suppose it's higher as the BV50 VGT turbos are also used by petrol Porsche's.
There are some videos/stories around on the internet of higly tuned diesels, where EGT went upto almost 1000ºC.
Thanks, What is the correct AFR? Actually runs with 1'05 lambda and 1'5bar full boost to 5000rpm but at hig rpm the boost cut I supose with lambda factor. My first data log:
Joined
·
1,951 Posts
There is no simple answer for "correct AFR". You need to read some textbooks about liquid hydrocarbon fuel combustion. Stoichiometric ratio (λ = 1) is 14,8 (kg of air to 1kg of fuel). For clean (sootless) diesel combustion you have to keep on at least λ = ~1,18.
Joined
·
2,313 Posts
Yep, around 17:1 is OK on most cars (if car smokes with AFR above 17:1 there is most probably something wrong with it, like boost leak, or bad injector).
But keep in mind that in Alfas ECUs fuel is measured in mm3 and air in mg, so first you need to "recalculate" fuel from "volume" to weight when calculating AFR.
But keep in mind that in Alfas ECUs fuel is measured in mm3 and air in mg, so first you need to "recalculate" fuel from "volume" to weight when calculating AFR.
Joined
·
1,796 Posts
870ºc seems high for these figures. In most cases this is caused by too much injection retard.
What you can do to lower it is increase rail pressure (make duration shorter) and advance the injection timing. But be aware, too much advance raises your peak cylinder pressure and can lift your head.
Hi
Actually runs with 1'7 bar to 4300rpm with 1.9bar of a peak, 1'45 to 5000 , lambda 1 , 1720bar rail presure, 1º advance, and 65mg of fuel. EGT 730º
.Next step 1'9 bar to 5000rpm, 85mm3, fuel rail 1750bar, te escalation of my injectors 80mm3
how to do to make 100mm3? mi ecu is edc16c39. I think actually inject 80mm3+avance = 72-74mg Enough for 220 hp?Mmmm 85mm3+1750bar rail presure not enough?
85mm3=72mg Mi brother runs 72mg of fuel on his 2.0tdi 16 v and make [email protected] with gt2256.
Joined
·
1,796 Posts
190 ?
I had 160 hp (+/- 170 uk bhp) with 78mm^3 from my JTD 8v...
To get close to 200 HP you will need something in the range of 100 mm^3.
80 mm^3 is more a stock turbo figure.
Joined
·
2,313 Posts
JS I agree with you... My estimation was based on 16v engine, which can (optimistically) produce close to 190 with 80mm3, (but not on "dutch" dyno ).
His engine is a bit newer with higher fuel pressure, also his turbo is less restrictive than the one you used, also he must be running with some very high AFR at the moment, since his injection is limited to 80mm3... All this helps for a bit more power, but it is definetely still less than 190 (and that is very opyimistic to begin with)...
Vic that TDI does not produce 240bhp with that injection quantity, or maybe it does if duration maps were properly massacred with tuning... But in that case you cant compare anything, since you dont know his realistic injection quantity...
As JS said you will have to raise injection up to at least 100mm to achieve 220bhp.
As you probably know user yan.ko injects well over 100mm3 and he says that his car should produce around 220... Now compare that to your figures
).His engine is a bit newer with higher fuel pressure, also his turbo is less restrictive than the one you used, also he must be running with some very high AFR at the moment, since his injection is limited to 80mm3... All this helps for a bit more power, but it is definetely still less than 190 (and that is very opyimistic to begin with)...
Vic that TDI does not produce 240bhp with that injection quantity, or maybe it does if duration maps were properly massacred with tuning... But in that case you cant compare anything, since you dont know his realistic injection quantity...
As JS said you will have to raise injection up to at least 100mm to achieve 220bhp.
As you probably know user yan.ko injects well over 100mm3 and he says that his car should produce around 220... Now compare that to your figures
My brother's car in a 60-200 km vs mazdaspeed 2010 version running the same. In my car the Italian tuners make 230hp with OEM injection sistem. When my car it's fine I'll post results at the dyno :thumbs:JS I agree with you... My estimation was based on 16v engine, which can (optimistically) produce close to 190 with 80mm3, (but not on "dutch" dyno
His engine is a bit newer with higher fuel pressure, also his turbo is less restrictive than the one you used, also he must be running with some very high AFR at the moment, since his injection is limited to 80mm3... All this helps for a bit more power, but it is definetely still less than 190 (and that is very opyimistic to begin with)...
Vic that TDI does not produce 240bhp with that injection quantity, or maybe it does if duration maps were properly massacred with tuning... But in that case you cant compare anything, since you dont know his realistic injection quantity...
As JS said you will have to raise injection up to at least 100mm to achieve 220bhp.
As you probably know user yan.ko injects well over 100mm3 and he says that his car should produce around 220... Now compare that to your figures
My brother dyno pull and acceleration in 3th gear (2 person on board):
2.0 TDI BKD+Gt2256 2XX Cv Pruebas circuito - YouTube
Attachments
Joined
·
2,313 Posts
Well, from the video I can see that it takes him almost 9s from 100-160...
My car has about 190BHP and 400Nm (injection is [email protected] and [email protected]) and it does 100-160 in just under 10s.
I'd say what we see here is some 10% too optimistic dyno.
My car has about 190BHP and 400Nm (injection is [email protected] and [email protected]) and it does 100-160 in just under 10s.
I'd say what we see here is some 10% too optimistic dyno.
Joined
·
59 Posts
Yes pretty puss, check this video. This is in fourth gear(not third), and does it in around 6-7 seconds.
http://www.youtube.com/watch?v=Pm9m1MlhrvE
http://www.youtube.com/watch?v=Pm9m1MlhrvE
1 - 20 of 30 Posts
