What is a TST?

[CDyksman]

Just as the title suggests, what is TST?

HOw does it work?

Do I need guages?

Is it a programmer?

I am asking these ?'s because I'm looking for better mileage, will it help?

Thanks in advance.

 

[Signal73]

www.tstproducts.com

 

[DrDiesel]

TST is the king of diesel boxes.

It is the most expandable for future mods as well as just adding it for HP/LB-FT, timing, fuel rail and gage package all in one unit. Adjust on the fly, turbo cool down and EGT limiter controls.

I had one on my 2003 and now on my new 2006.

I love it... .

 

[pipeguy]

TST also has a system that is for only economy. One setting ...

Give them a call and have a talk with them. They are a great bunch of guys and will be able to give you the best product for your application.



If you follow the link by "SIGNAL" you will find there contact info.

 

[ENafziger]

And, yes, you need gauges. The backdown built into TST is limited by the sensors that they plug in to. I had to learn the hard way. TST backdown was set on 37 psi, and after installing new gauges, I found out I was actually pegging 60!!! Not good... or too good, depending on how you look at it!

 

[DrDiesel]

And, yes, you need gauges. The backdown built into TST is limited by the sensors that they plug in to. I had to learn the hard way. TST backdown was set on 37 psi, and after installing new gauges, I found out I was actually pegging 60!!! Not good... or too good, depending on how you look at it!

What`s Back-Down. Never heard this term. Also, how do know it`s not your aftermarket gage that`s incorrect. I like how the conclusion was made that the TST info is wrong without proper verification. I`m not trying to be a smart arse either. I just feel that your statement is unfounded without proper verification. You have compared one to another and have no way of knowing without a qualifier.

This is what contributes to miss/bad/incorrect product information... . :--)

 

[ENafziger]

how do know it`s not your aftermarket gage that`s incorrect. I like how the conclusion was made that the TST info is wrong without proper verification. I`m not trying to be a smart arse either. I just feel that your statement is unfounded without proper verification. You have compared one to another and have no way of knowing without a qualifier.

Dr. Diesel,



I'm not spreading unfounded information here. Most people recommend that gauges should be the very first mod that is done. I chose not to listen to that, and purchased a TST CR R49 w/gauges. One thing led to another, and pretty soon I had 5" straight pipe exhaust, AFE Stage II intake, an II SPS66 turbo, EDGE EZ chip stacked, and so on... and still no gauges. Definately not a smart thing. The TST has the option of setting a maximum desired EGT and Boost... when these values are reached, TST will "backdown" the fuel, to avoid exceeding these values.



The OEM "boost" sensor on our trucks only reads to 39 psi... the same as the upper setting of the TST backdown boost feature. Therefore, when actual boost pressure goes higher than 39 psi, neither TST nor the OEM sensor knows how high because the value is outside the limits of the sensor. Using the stock turbo charger, I don't think that this would be much of a problem. However, larger turbos and stacked fueling boxes all lend theirselves to much higher achievable boost levels... as in my case.



I thought my SPS66 came wastegated to 55 psi, and so even though I knew I would be exceeding the OEM sensor's range, I felt reasonably confident that boost shouldn't exceed this 55 psi level; however, I never hooked a regulated compressed air source to test this as I should have done.



Upon installing analog gauges, I realized immediately why people recommend gauges as one of first mods... my boost gauge pegged 60 psi briefly before coming down, and stabilizing at about 55!!!



No, I haven't verified this using multiple gauges, but I have no reason to doubt that an overfueled SPS66 can make 60 psi boost. If you call Industrial Injection, I believe you'll find the turbo is capable of making 70+ psi boost.



Do a little research around here, ride in a few modded trucks, and I believe you'll find that I'm not just making up good stories with no verification. And, no, I'm not bashing TST... it uses the MAP sensor for its boost reading, and because of that, it can not read above 39 psi boost. It's nobody's fault, it's just the way it is... and analog gauges will prove it.



Hope this helps, Eric

 

[seemore]

Dr D,

It didn't sound like ENafziger's "statement is unfounded without proper verification". It sounded like he was giving good advice to be sure to get gauges with any mod!!

 

[hintonJ]

TST is a baaaad 1/4 mile truck too...

 

[BSwope]

Ill have to agree, that things pulls hard on top!

 

[DrDiesel]

OK. The TST limits boost @35 psi. That`s the default setting. It has EGT and Boost gages with a EGT limiter.

I did not try to answer a question related to a highly modded truck such as yours.

The person that asked the question has a stock 06. Same as I have.

Your adding your bad experience with all the mods you have into the mix.

This is not what this person is looking to do. So with all the mods you have done, your truck runs some ridiculous boost numbers , but it`s the TST box that`s reading incorrectly... HHMMMMMMMMMMMMMM.

Sounds like you didn`t do your home work before you started down the dark path...

I have a stock truck with the TST R49, it reads 35 maybe 37 psi of boost.

The de-fuel program based on EGT`s works perfect. The only gage he would need other than what the TST has would be a fuel gage. Maybe later if he`s modding by then.

I do agree if your stacking and changing turbo`s ETC. that you should have a complete set of aftermarket gages to cover yourself/trucks ARSE so you don`t burn it to the ground.

Let`s not add into what the question pertains too.....

 

[Diesel Nut]

Just get some twins, a trans and get it over with!



The TST is awesome in every respect. Completely reliable, top notch performance (power and economy), and comparably priced.

 

[Yo Hoot]

So does the TST backdown at 39psi since it does correctly read psi? I seems to me that the TST will not allow higher than 39psi boost levels even if you want it? It must be backing out at 39 but since it's not a boost control device, the boost still kicks up higher with the residual fuel load. That's probably why you see the 60 psi spike.

 

[DrDiesel]

The TST box will de-fuel when the boost passes the set limit.

It also states the boost is read from the MAP sensor and it has a maximum limit of 40 psi.

 

[ENafziger]

Your adding your bad experience with all the mods you have into the mix.

Dr. Diesel,



I'm not sure what you have against me, but I'm not adding bad experience into the mix. And, yes, I have done my homework.



The original post asked if gauges should be added when adding a TST. I replied (like many others have) that gauges should be considered one of the first mods that is done, regardless of running one chip or stacked chips. Again, this is my opinion, but it reflects the opinion of many others as well.



I gave my example with the intent of showing the original poster that the boost limiter feature on the TST should be used with caution, as many more people that just myself have exceeded the 39 psi max value displayed by the TST. And, no, not just people with larger turbos. I've read several discussions on TDR about people with stockers pushing 40+ psi boost. Yes, the TST boost readout is a nice feature, but you have to understand its limitations as well.



I gave my advice to the original poster, just as you did. There's no need to say that I'm posting unfounded information, not doing my homework, etc. I'm simply trying to pass on some helpful information that I've learned through hours of reading, wrenching, personal experience, etc. No one is required to follow other's advice on these forums, but it's not too cool either to bash other people's posts or character. We're all here to help each other, right? --Eric

 

[DrDiesel]

Dr. Diesel,



I'm not sure what you have against me, but I'm not adding bad experience into the mix. And, yes, I have done my homework.



The original post asked if gauges should be added when adding a TST. I replied (like many others have) that gauges should be considered one of the first mods that is done, regardless of running one chip or stacked chips. Again, this is my opinion, but it reflects the opinion of many others as well.



I gave my example with the intent of showing the original poster that the boost limiter feature on the TST should be used with caution, as many more people that just myself have exceeded the 39 psi max value displayed by the TST. And, no, not just people with larger turbos. I've read several discussions on TDR about people with stockers pushing 40+ psi boost. Yes, the TST boost readout is a nice feature, but you have to understand its limitations as well.



I gave my advice to the original poster, just as you did. There's no need to say that I'm posting unfounded information, not doing my homework, etc. I'm simply trying to pass on some helpful information that I've learned through hours of reading, wrenching, personal experience, etc. No one is required to follow other's advice on these forums, but it's not too cool either to bash other people's posts or character. We're all here to help each other, right? --Eric

I have nothing against you. Your posts speak for them-self... .

I think is great that you advise based on first hand experience. Maybe you could save someone from the same mistake`s. The TST works as designed and stated in all there data and installation information. Something that was obviously missed by you. That`s all I`m talking about. You made a mistake and I pointed it out. Don`t take it personal. This is a discussion about a TST box and it`s function`s not your mistake and mods. Happy Motoring.

 

[ENafziger]

The TST works as designed and stated in all there data and installation information. Something that was obviously missed by you. That`s all I`m talking about. You made a mistake and I pointed it out.

I know the TST works as designed. Yes, I read the instructions. The point of my posts is to inform that TST WILL NOT read boost pressures higher than 39 psi. That is not a mistake. That is the limitation of the OEM sensor. With a mechanical gauge, it's easy to see if you've pegged or not. With the TST, it's not obvious, unless you are aware that the reading saturates at 39 psi. That's not a mistake. It's the limitation of the sensor. The TST is working as designed if it reads 39 psi and the actual boost is 50 psi. However, without a good set of gauges, you would never know that. I don't think I'm missing anything or spreading false information.



Again, I didn't make a mistake by adding analog gauges... if anything, I made a mistake by not adding them sooner. I revealed that about myself in the posts, and was informing the original poster and you as well! In fact, adding gauges should be seriously considered by all people thinking about performance mods... especially more extreme boxes such as the TST.

 

[BSwope]

I have analog gauges and the R49, gauges came first!

 

[DrDiesel]

I have a TST with TST gages. No problems. Of course I have a stock truck. :-laf