isuzu dmax 2010 exhaust

Submitted: Friday, Feb 08, 2013 at 17:28
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wondering if any out there could help me out what would be the best size exhaust for my isuzu dmax 2010 2 and half'' or 3'' and should i put the same size dump pipe on
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Reply By: Ross M - Friday, Feb 08, 2013 at 19:39

Friday, Feb 08, 2013 at 19:39
Jack p1
First of al,l a dump pipe is the bit which goes directly from the outlet of the turbo exit flange and is generally a wide oval shape which has it's large oval size, maybe 4" oval, gradually reduced to a size, commonly 2 3/4" or 3" depending on model.
The drop pipe which is next in line often has the large size, maybe 3" reduce down to the continuing pipe size used for the rest of the system ie 2 3/4" or may even remain the 3" size and it is continued right through.
I believe both sizes of exhaust are available.

Probably for normal use 2 3/4" will suit you well, Beaudesert sell that size while other brands may offer the 3". I don't think you will notice any difference between the two sizes but the larger might be harder to fit and clear all the gear and provide good positioning of all components.

You don't say if it is a dual cab with tub or tray. check your model carefully as there is some differences and one Dmax may not fit another Dmax.
The wheelbase of a dctub is 3050mm while others are 3200mm so yes there is a difference so you must get the correct one. Be aware of this when ordering/buying.

Ross M
AnswerID: 504337

Follow Up By: Ross M - Friday, Feb 08, 2013 at 20:04

Friday, Feb 08, 2013 at 20:04
Trivia entry.

The Dmax OE size of the engine/drop pipe if it can be called that, is less than 50mm where a BT 50 in the same area has a OE pipe dia of 68mm.
Considerably bigger to begin with.
With the bigger exhaust on the Dmax you will have around the same size as a BT50 does.
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Follow Up By: Isuzumu - Friday, Feb 08, 2013 at 20:27

Friday, Feb 08, 2013 at 20:27
The mandrel bending is the key here, the standard Mazda BT 50 is not mandrel bent, just had a 2 3/4 made for our 2102 Isuzu D.Max (first they have done for this model) they make one for your model and ship it to you so you can fit it yourself. It will be a good engine up grade, do the chip as well.
Cheers Bruce
D.Max and Jayco Outback

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Follow Up By: olcoolone - Friday, Feb 08, 2013 at 23:02

Friday, Feb 08, 2013 at 23:02
Arhhh the mandrel bend theory..... mandrel bends over a conventional compression bend accounts for a 1-2% at most performance increase on a standard engine...... but accounts for a 40% price increase!

I can guarantee you will not notice any difference, if it did offer the snake oil hype of noticeable more performance and better fuel consumption the vehicle manufactures would be using mandrel exhaust on all there models....... seeing the spend 10's of millions of dollars on saving grams, engine auxiliary loads and low friction materials and surfaces in the quest of obtaining 1-4% fuel savings and performance boost.

They could of just fitted a mandrel exhaust, saved the millions and got better results.

Restrictive bend in inlet and exhaust systems fitted to vehicle are done for many reasons including noise, performance and fit.... what might been seen by some as a stupid restriction may be more beneficial then one thinks.
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Follow Up By: Isuzumu - Saturday, Feb 09, 2013 at 08:12

Saturday, Feb 09, 2013 at 08:12
Have you ever had one fitted?
Cheers Bruce
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Follow Up By: olcoolone - Saturday, Feb 09, 2013 at 11:11

Saturday, Feb 09, 2013 at 11:11
I come from a racing background and know the advantages and disadvantages of compression and mandrel bends.

Yes there are advantages but not a great as one may think.

When gas flow is increased you may gain top end but you loose bottom end..... this will show on any dyno graph and seeing most people want low down torque from a diesel going mandrel bend may may give the opposite result.

I'm all for mandrel bends on high performance engines where every 1Kw is an advantage but for road use I would sooner spend my money on something else.
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Follow Up By: Isuzumu - Saturday, Feb 09, 2013 at 12:35

Saturday, Feb 09, 2013 at 12:35
This is my third one and the advantage has allways been to bring in the turbo at lower rpm to help with turbo lag which is a real pain in all TDs
Cheers Bruce
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Reply By: jack p1 - Friday, Feb 08, 2013 at 20:23

Friday, Feb 08, 2013 at 20:23
thanks guys just some people been telling me go for the 2 and half inch then some say 3 would be better i have the 2010 damx LE duel cab with tub in the LS model its only a 3.0 L turbo would it keep up with the 3'' exhaust
AnswerID: 504338

Reply By: Grant L - Friday, Feb 08, 2013 at 20:41

Friday, Feb 08, 2013 at 20:41
Hi jack p1

I have Colorado dual cab 4wd 2010 model put 3" exhaust right through including dump pipe got it from mob in Bris within 24 hrs fitted perfect did it myself had to modify heat shield at turbo flange slightly took about three hours without hoist on my own.
Results very inconclusive fuel consumption the same although did appear to have better performance through gears and better response from accelerator.
A month later put in K & N sports air filter which appeared to help acceleration and mid range torque also marginally better fuel consumption say 1 litre only, have now done at least 25k with this setup towing 23' van presently 68klms east of Southern Cross WA ,
Yesterday did 397 Klm starting east of Balladonia WA through Norseman to Kalgoorlie, were I filled up this morn with 56.31ltrs you can work out the consumption.
Please note yesterday there was none or little wind 25deg day rolling hills not using aircon till Norseman Kalgoolie leg run it at 85 to 95 in fifth but 4th below 80klm/hr(please note on windy day fuel consumption can see worst of approx 16 to 18 ltrs/100ks but my van is like a sail.
Exhaust cost $900. Air filter $100.
Hope this info helps

Grant
AnswerID: 504341

Follow Up By: jack p1 - Friday, Feb 08, 2013 at 21:06

Friday, Feb 08, 2013 at 21:06
thanks grant

yeah does help alot good too hear from people that have done it yeah was going to get the chip as well

cheers jack
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Follow Up By: Ross M - Friday, Feb 08, 2013 at 21:44

Friday, Feb 08, 2013 at 21:44
Grant L
Just a comment off topic. I noticed your K&N mention in the post.
If you value your engine it would be best to use an airfilter better than the 30micron K&N.
They do not stop fine dust entering your intake system and cylinders.
OK for a street car perhaps, but not for a touring vehicle where dust may be in the air. They do flow more air at the expense of clean air.

Ross M
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Follow Up By: Grant L - Friday, Feb 08, 2013 at 23:06

Friday, Feb 08, 2013 at 23:06
Thanks Ross M
I am watching it (air filter) closely each service check beyond element to ensure no foreign matter has past usually leave a slight smear of oil and when checking wipe it with tissue, so far so good also coming from experience with vlate own merc truck in which dealer would not change air filter for (wait for it) three years that was 500k stating that the more build up of matter in filter the better they work. Hm.
Also have mate in Sydney who has run them for some time (don't no what Klm) and swears by them.
Done 25k plus so far since fitting haven't washed it yet vehicle doesn't use oil same as past two units I owned which both did roughly 400k each. Time will tell, happy so far.

Grant
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FollowupID: 781138

Reply By: Rockape - Friday, Feb 08, 2013 at 20:51

Friday, Feb 08, 2013 at 20:51
Jacko,
check out Beaudesert exhausts. They do a lot of R&D and I think theirs is 2 3/4 inch system.

Bigger is not always better.

RA.
AnswerID: 504342

Follow Up By: jack p1 - Friday, Feb 08, 2013 at 21:09

Friday, Feb 08, 2013 at 21:09
cheers rockape

been to a few places round my home town and there all saying different things think ill go for the 2 3/4 inch system though
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FollowupID: 781125

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