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Post by dani4JB1T on Jun 16, 2004 13:17:14 GMT 11
that`s AMAZING !!!!!!.....Our Isuzu`s are very very Great !!!..... definitively they do not let surprise to me....I don`t know what to say anymore....Just Thanks Isuzu !!!!!
PD: but still think that 620 Nm it`s roo much !!!..maybe it can be an error on the Nm`s scale. I think that it would be 320 Nm.
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Post by Witchdoctor on Jun 16, 2004 16:55:05 GMT 11
Sorry to be negative on this.  Spoke to an old deisel mechanic about the figures, his first words impossible 600Nm of torque 61 Kw just do not work in his experience. Porsche Cayenne 331 Kw 620Nm petrol t/turbo 4.5Lt Ford F-350 175 Kw 684Nm deisel turbo 7.3Lt Jeep Cherokee 110 Kw 360Nm deisel turbo 2.8Lt His next thought was that maybe the dyno needs recalibrating. Is there a deisel mechanic in the club that can set me straight on this. Dave |
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Post by pig75 on Jun 16, 2004 18:44:33 GMT 11
depending on what gear you are in the torque will change. power doesn't change with gearing. try low first and see what the torque does  |
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Post by Graham on Jun 16, 2004 21:36:56 GMT 11
WitchDoctor, where do you get 600Nm from? The dyno says it's in lb/ft of torque. a Quick check for an on-line converter found: hemsidor.torget.se/users/b/bohjohan/convert/conv2_e.htm600 lb/ft = 800Nm !! You might be right about the dyno being out, and that is quite common. It's OK to compare different dyno results, but I've been advised to always take them with a grain of salt. Different story if they are accurately calibrated or testing on the same dyno. regardless of the numbers, a 50% increase in Torque is amazing! Just think, I raced a P-Plater in an old Ford Falcon Ute last night and was 2 car lengths in front at 60kph. With a new exhaust, I might be able to race a real car!  Cheers! Graham. |
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Post by Witchdoctor on Jun 16, 2004 22:21:07 GMT 11
I think that alot of people look into the graphs for something? The secound printout shows 620Nm@44Kph in 3rd gear 61Kw@ 60+Kph.
Every day this little deisel blows me away with its performance. Go the MUUUUUUUUU ;D
Dave
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Post by Bruce on Jun 17, 2004 7:50:44 GMT 11
When they were tuned was the injector pump fuel rate increased and the turbo boost increased?
Does anyone know what the black thing with the four wires is on top of the injector pump? It looks like it can be adjusted.
Just reading the local rag and they have an article on the new Disco, it now has a V6 2.7 litre turbo diesel and has 140 kpw and 440 nm, the 4.4 V8 220 kpw and 425 nm, unbelieveable what they can get out of small diesels now.
Cheers Bruce
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Post by francesco on Jun 17, 2004 16:44:29 GMT 11
Hi all, Well seems that this is creating some interesting discussion. Look, I dont know much about what these figures mean, or how it compares, but I can tell you 1 thing THE MU NOW GOES !!! ;D I drove a stardard 3.1 today, and I tell you....mine growls at it. For the cost of the work done, and the amount of increase....shes worth it. In my opinion, must things to do. 1) 2.5" or 3" exhaust off the turbo 2) snorkle 3) Dyno, and block the EGR's if you can afford the extra, 4) Locker in the Back (this is 4th for me because I like to do more speed on dirt tracks - rally style ;D otherwise I would put this at 3) 5) Intercooler Well this is my schedule anyway  |
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Post by mudgrip4 on Jun 17, 2004 17:45:16 GMT 11
Justa couple of questions - what exactly are EGR's and what do you do to block them? Also what does the dyno actually tune to help give this level ofperformance increase.
It's true calibration from machines can vary. I know you can get up to 25% variation measuring compression leakdown from different companies. But even if these figures for torque and hp are on the high side, it's the level of increase on each vehicle that's amazing.
Doing my 2.5" shortly, but can you possibly check Francesco just how they altered the tuning and how many lbs they adjusted the turbo up? May well have been advancing injection timing that has contributed. The word I have is when you combine this with the bigbore, the benefit of the bigbore is much more. Thanks - Mike.
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Post by geeves on Jun 17, 2004 20:14:02 GMT 11
EGR = exhaust gas recirculation. otherwise known as anti polution. You can just put a gasket between the 2 valves on the inlet manifold and the manifold but its better to remove them completely and weld up the pipe that comes from the exhaust to them PROVIDING this is ok with your local emmision laws. I dont know if its true but I have been told that 12psi is standard for the 2.8 turbo.
The advantage of tuning on a dyno is you can tune for results not just to the adjustment marks that mr isuzu put there
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Dave M
Isuzu Baby
'89 Bighorn 2.8 LWB
Posts: 22
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Post by Dave M on Jun 17, 2004 20:43:23 GMT 11
2.8 boost pressure is usually 11 psi. As for the dyno figures, remember it was done in 3rd gear plus going through another 4.3 reduction of the diff. These multiply the torque hugely. Manufacturers quote power and torque at the crank, not wheels. An average 2.8 is around 225NM at the crank.
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Post by Graham on Jun 17, 2004 20:51:16 GMT 11
Apologies for my earlier post - the middle dyno sheet is Nm & kW while the other 2 are lb/ft & hp. Looks like an 80% gain though which is amazing. Certainly increases the timetable for my 2.5/3" exhaust and intercooler installation Graham. |
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Post by dani4JB1T on Jun 18, 2004 3:55:00 GMT 11
i know that you block the EGR`s you will win more power and torque, but if you do that you will increase your engine temp too. This could be dangerous because your engine`s life will be reduce it by the overheating. I don`t know how much your engine`s life will be reduce, but it will....EGR`s are not a simple device without importance, and they requires maintenance too.
cheers !!
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Post by Yarno on Jun 18, 2004 15:32:04 GMT 11
i know that you block the EGR`s you will win more power and torque, but if you do that you will increase your engine temp too. This could be dangerous because your engine`s life will be reduce it by the overheating. I don`t know how much your engine`s life will be reduce, but it will....EGR`s are not a simple device without importance, and they requires maintenance too. cheers !! I don't see how this would increase temp in the engine as you would be removing the hot exhaust gasses from the intake.... which I would see as being cooler!!! |
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Post by Yarno on Jun 18, 2004 15:35:19 GMT 11
2.8 boost pressure is usually 11 psi. As for the dyno figures, remember it was done in 3rd gear plus going through another 4.3 reduction of the diff. These multiply the torque hugely. Manufacturers quote power and torque at the crank, not wheels. An average 2.8 is around 225NM at the crank. The MU has 4.56 diff so this would increase torque even more!! |
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Post by geeves on Jun 18, 2004 18:30:32 GMT 11
i know that you block the EGR`s you will win more power and torque, but if you do that you will increase your engine temp too. This could be dangerous because your engine`s life will be reduce it by the overheating. I don`t know how much your engine`s life will be reduce, but it will....EGR`s are not a simple device without importance, and they requires maintenance too.
cheers !!
Yes and no. The EGRs function is to lower combustion temperature by adding a relitivly inert gas to the mix. This is suposed to decrease nitos oxide being produced. It has no other real function.Disconecting it will alow the engine to breath better and therfore cooler except that the higher charge available if used could cause the engine to run hotter although this would not be the case in normal use. EGRs do need maintanance if they are to do there job as they do clog and leak etc but here in clean green NZ we have no real emmisions laws and it has been common to remove these and catyletic converters for years nearly always with an improvment in performance and ecconomy.
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Brad
Isuzu Baby
Posts: 15
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Post by Brad on Jun 19, 2004 1:47:28 GMT 11
Yaros, on the right trackwith these big torque numbers.
those reading are off a chasis dyne - torque measured at the wheels.
Thats the engine torque multiplied by the gear (3rd I think I saw in one of the plots) and the diff ratio (?) and then by the tyre size onto the dyno roller.
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Post by Bruce on Jul 30, 2004 7:49:10 GMT 11
Hi all, does anyone know how they get into the injector pump to change the settings on the 3.1? As it is a bit of away to go to Brisbane to get a tune up I have been talking to the dyno place in Gladstone and as they have not done one of these motors they are making some inquires and I though I would see if anyone here knew what they did to theirs.
Cheers Bruce
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Post by ben on Aug 10, 2004 20:56:15 GMT 11
Just out of curiosity, what boost should my truck be running, its a 1991 swb bighorn Irmscher s 2.8 turbo intercooled, standard, and what can i safely take it up to?
Cheers for any info
Ben
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Post by namic69 on Apr 10, 2005 19:03:27 GMT 11
Matt, who did the work for you and how would they cope with a 96 Bighorn?
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praxis
Isuzu Baby
MU's Rule!!!
Posts: 10
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Post by praxis on May 20, 2005 12:11:57 GMT 11
Been looking for my Dyno figures and cant find the graphs but needless to say after putting on a 2.5 inch exhaust system and unifilter with 12 pound of boost , I was getting 88 KW from the back wheels of the MU but I cant remember the torque figures. Havent changed any fuel settings at all. Vehicle is 96 3.1TD. Purchased vehicle at 40K and now have 120K on the clock and its still going strong!!! Cheers Geoff  |
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