smoke

[french7777]

I just received all the parts to install a holset 40 on my 98 6.5 does anyone have experience on smoking from the exhaust on acceleration or kickdown and what do you do to minimize it ,I have been told that since i use it mostly for towing a trailer that I would experience turbo lag and lots of black smoke plus little power in the 2000rpm power band that I need for towing i was contemplating also the addition of a heath or kojo tune ,can you tell me the best one to use for towing

 

[WarWagon]

Kojo tunes are sold with large turbos like the A Team Turbo. Heath only sells the restrictive quick spool GM turbos and Turbo Masters. IMO the Kojo tune would have more of the the 'open mind' for larger turbo tuning.

I assume you have black smoke with the factory GM turbo? If so you have issues with the vacuum system. You are replacing the turbo and will no longer need the vac system so don't worry about it.

To reduce black smoke with a larger turbo:
4" exhaust with 4" converter.
Tune.
Downshift more for power. Smoking bad - you are lugging the engine: downshift so the turbo can get up to speed. MT - is up to you and Automatics are in the tune.
Larger precups. Some 6.5 rebuilt engines appear to have been changed out with 6.5 NA engines giving you smaller than turbo precups - rare. The Diamond precups are the newest ones out there. The larger the precup (to a point) and the less smoke - more fuel you can burn w/o smoke.
New injectors and suggested higher pop pressures.

 

[buddy]

You probably won't have much smoke with the HX40, are you just assuming you will, or someone suggested it was too big? Which HX40 model did you get?

 

[WarWagon]

You could also have exhaust problems, like a plugged cat, collapsed crossover, or leaks before the turbo.

 

[Slim Shady]

My suggestion is get a good tuner, they can make a turbo run or smoke depending on how they tune for it. Not all tuner's have an open mind about tunning for a turbo. If you were told that something will smoke and you heard it from someone that doesn't run one then don't believe it. opinions are like A SS e 's everyone has one and they don't necessarily know what they are talking about. Matter of fact most people that are most opinionated about one thing or another typically don't know, they just like telling people they do. (just my opinion)

 

[french7777]

Hi thanks for all the info ...............to tell you the truth and I was talking to bill heath and he suggested I remove the holset 40 and reinstall the gm turbo with his tubo kit he is the one who suggested I might have tons of black smoke on acceleration and here in Ontario you will get chased down by the smoke police and ticketed which they love to do so that is why I'm at a stanstill i want the power and not the smoke

 

[Jorge6.5]

You wont have smoke from that turbo. The stock gm turbo sucks as a single on the 6.5, sounds like Heath was trying to sell you an overpriced gm turbo for $1000.

I dont understand where he gets his reasoning with turbos. His turbo kit wont hold a candle to what you got!

 

[buddy]

You never said which HX40 you have? The HX40WII will spool so fast you wont know what to do with all the boost you can make, other than dump it at whatever boost you want to sustain.

You are being misled, throw it on and have some fun.

I just helped tune a truck for a guy in Saskatchewan that also didnt want to smoke. So he went with the HX40WII, rather than the larger ones that might give you some. Regardless, even with my ATT that is even larger, it doesnt smoke bad if you dont do it on purpose. Your foot is the smoke generator. And depending on your fuel levels and curve and timing it can be minimal even with the larger ATT.

 

[Jorge6.5]

You never said which HX40 you have? The HX40WII will spool so fast you wont know what to do with all the boost you can make, other than dump it at whatever boost you want to sustain.

You are being misled, throw it on and have some fun.

100% right, I couldn't agree more.

 

[Slim Shady]

Hi thanks for all the info ...............to tell you the truth and I was talking to bill heath and he suggested I remove the holset 40 and reinstall the gm turbo with his tubo kit he is the one who suggested I might have tons of black smoke on acceleration and here in Ontario you will get chased down by the smoke police and ticketed which they love to do so that is why I'm at a stanstill i want the power and not the smoke

I guess now you found out what I posted was true. I know what you were told and have heard it a million times from people that were told the same thing, only about another product. (same speech though).

 

[french7777]

wow talk about confusion ,I just talked to Kojo and they sounded really knowledgeable and i will go with them ,he told me that he will make a couple of differente adjustments so it does not smoke too much on acceleration and at the same time i,m going to add thier fuel enhancement kit

 

[great white]

wow talk about confusion ,I just talked to Kojo and they sounded really knowledgeable and i will go with them ,he told me that he will make a couple of differente adjustments so it does not smoke too much on acceleration and at the same time i,m going to add thier fuel enhancement kit

"fuel enhancement kit"?

Tell me more, a bit curious as to what this entails.

Not trying to chuck sh**, just curious......

 

[french7777]

"fuel enhancement kit"?

Tell me more, a bit curious as to what this entails.

Not trying to chuck sh**, just curious......

from what I understand they can prg it to be leaner I would guess , not quite sure but he said they could compensate ,I would think not give it has much fuel or adjust the fuel map

 

[french7777]

he has a fuel line that runs from the filter to the distributeur that enlarges the line to 3/8 of an inch instead of a 1/4 and allows it to have more fuel

 

[great white]

he has a fuel line that runs from the filter to the distributeur that enlarges the line to 3/8 of an inch instead of a 1/4 and allows it to have more fuel

Ah, that's what is known as "feed the beast" modification on this forum.

Pioneered by Tim when he was frequenting another "diesel place" on the web.....

Sold by Walking J.

I've got FTB ver 2 on my 98. Same thing, but with a braided stainless hose.

The GM8 is not a favorite on this forum. It all depends on how you intend to use your truck as to whether or not it is appropriate. I won't get too far into it but my gm8 with a TM hauls my truck just fine in daily use, gets good mileage and allowed my truck to my 35 foot 8500lb trailer from Vancouver island to Newfoundland. Bill might have made the recommendation based on what he knows and what you told him you'd be using the truck for. The "smoke" might have also been a factor in the recommendation. I can't say either way because I wasn't part of the conversation.

Now, if you're looking to attack the 1/4 mile, post "big" dyno HP numbers or build a purpose specific rig (puller, etc) the GM8 may not be the best choice.

The smoke can be addressed in a couple ways, pulling fuel is one of them.

Kojo has been at this for a while, you're in good hands......

 

[buddy]

If I recall that long trip cross country with the GM8, TM and tune also entailed an engine swap. Bigger turbo could add considerable reliability to the 6.5 so they dont get so worn out and fail as easily. At the same time holding more boost than necessary and too much advance could shorten engine life. Engine may have been ready to go, but the extra towing stress with new operating parameters could have broke the camels back. Hopefully with less stress from better breathing and lower IATs the engines never get to that point.

 

[great white]

If I recall that long trip cross country with the GM8, TM and tune also entailed an engine swap. Bigger turbo could add considerable reliability to the 6.5 so they dont get so worn out and fail as easily. At the same time holding more boost than necessary and too much advance could shorten engine life. Engine may have been ready to go, but the extra towing stress with new operating parameters could have broke the camels back. Hopefully with less stress from better breathing and lower IATs the engines never get to that point.

Since you feel the need to address me directly, I'll respond to you directly;

It was not the turbo, TM or "tune" that caused the failure.

Believe whatever you want.

I'm not getting into it here.

There will be no further responses with regards to this subject.

 

[buddy]

Great I didnt want to read anything more from you anyway.

Just a data point, and another selling point for a better breathing setup, it reduces engine stress. You can hear it, you can feel it. Over the life of the engine a larger turbo could significantly reduce wear.