Engine/Transmission (1998.5 - 2002) HTT SP66/14 Turbo?????

[MrDiesel]

Now I'm a little confused about better drivability but slower spool up? Seems like it would be worse to drive it it did not spool...

 

[BradyWilliams]

When you install a SPS66/80 or any Phat Shaft turbo for that matter you absolutley need a Air Intake System. A AFE Stage 2 would be a very nice choice for installing with a Phat Shaft product. We are distributors for AFE and can make you a very good buy. The surging that some people see is a result of a restricted air intake. You need a system that will handle 1000+cfm to make the turbo work right. Thanks

 

[MrDiesel]

I have an AFE. I'm still confused on the clipping issue. If clipping raises spool up RMS wouldn't that make it a little harder to drive on the street?

 

[Smokin_Monster]

It doesn't affect your spoolup at all. If it does you won't notice. It just makes it relase the pressure a little better and not surge so bad. Drivability is definately improved.

 

[MrDiesel]

Sounds good... So I'm guessing some of you have done your home work here... where's the best place to buy one???

 

[CumminsAholic]

A buddy of mine put on a silver bullet 66 from II. It's on a 2001, he has no surging issues like I have with my sps64 and says the spoolup is really good. I may have to upgrade.

Corey

 

[mcdaniel1]

Here is one for the gurus. If a truck had a SP66/14 that surged, and then used that same 66 as the little turbo in a twins setup, would the surge remain? or would it go away due to better breathing of the twins... .

 

[DTroy]

I have a question that's probably quite simple for you turbo guru's.



What is the surging and what actually causes it?

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[mcdaniel1]

... . The surging that some people see is a result of a restricted air intake. You need a system that will handle 1000+cfm to make the turbo work right. Thanks

This is really all that has been said that relates to "why" they surge. Is there more to it. ? which brings me to my question above. would adding the 66 to a twins setup still surge if it surged as a single?

 

[Jetpilot]

The 66 in twin setups is working great as long as you have big fuel. To really match the up a 66 you would need to run something like a Big Brother size turbo. This has proved to not be a good primary for the 24 guys... ... Now if you are running a heavily fueled 12v this is a hot setup.



Doug

 

[RyanB]

The 66 in twin setups is working great as long as you have big fuel. To really match the up a 66 you would need to run something like a Big Brother size turbo. This has proved to not be a good primary for the 24 guys... ... Now if you are running a heavily fueled 12v this is a hot setup.



Doug

Good info Doug- I was thinking of going this route but already have my HT3B... . Anyone have prices on the Big Brothers or know where I could get one? Anyone looking for a brand new HT3B still in the box???? PM me if you do!!!!



About the Big Brother... how much larger is it than the HT3B? High Tech Turbo also told me I could run a Super 4C... . does anyone know anything about that turbo?



The way its looking... I will have enough fuel to run a SP66 up top and could run something fairly large on the bottom.



One thing that I have to rember though is that I can't run anything larger than a 3" inducer and if I do I have to run a reducer down to 3".



The HT3B is 2. 913"

HTT's Super 4C is 3. 307"

Whats the Big Brother???





Ryan

 

[Jetpilot]

Ryan,



The VP just does not provide enough fuel to keep one of these larger turbos running... . On the dragstrip guys normally loose about a full second when we have tried a BB or S4T type turbo as the primary. On the sledtrack the trucks come up short due to coming off the rpm needed to keep the charger going so it equals less distance. The 24v like the HTB3, B2, or S400 size turbo for the primary, this works awsome when paired to a 62mm secondary turbo.



As for the inducer size on the BB it is larger than 3" but I will need to look up the exact size.



Doug

 

[RyanB]

Ryan,



The VP just does not provide enough fuel to keep one of these larger turbos running... . On the dragstrip guys normally loose about a full second when we have tried a BB or S4T type turbo as the primary. On the sledtrack the trucks come up short due to coming off the rpm needed to keep the charger going so it equals less distance. The 24v like the HTB3, B2, or S400 size turbo for the primary, this works awsome when paired to a 62mm secondary turbo.



As for the inducer size on the BB it is larger than 3" but I will need to look up the exact size.



Doug

Mine is a P-Pump... just was intrested in what was going on here. My pump has 13MM P&B's , cut Pulling cam, 191 DV's, 5GSK and other mods... should be good for a few more cc's than stock!

 

[Hohn]

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Surging is flow instability that results when the turbo's compressor is trying to deliver more air than the engine will accept.

A good way visualize it is to see a turbo compressor map. The area to the left of the mapped area is the "surge region" or the conditions that will cause flow instability.

Another way conceptualize surging is "overspooling". The turbo wants to give the engine more air than it can handle.

The difference in cylinder head flows is why the same turbo may or may not surge on one engine or another. The turbo that works well on a HPCR truck may have mild surging on a VP44 truck, and LOTS of surging on a 12V truck. The stock 12V will not accept as much air as a stock HPCR, thus it tends to surge more with the same turbo.

A larger turbine housing can reduce surge by causing the engine to operate farther to the right on the compressor map.

From a spoolup standpoint, the ideal would be operating right ON the surge line all the way up. This can't be done, though-- so turbo guys try to make it as close to the surge line as they can without crossing it. If they must cross it, they try to make it by the smallest amount and for the smallest time.

"Barking" the turbo is not the same as surging.

JH

 

[Hohn]

This is really all that has been said that relates to "why" they surge. Is there more to it. ? which brings me to my question above. would adding the 66 to a twins setup still surge if it surged as a single?

No. The same turbo used in a twins combination will be less likely to surge-- because putting it in twins makes BOTH the hot side and "cold" side less likely to surge.

On the hot side, the turbo spools less because the pressure drop across it's turbine is less (due to the restriction of the larger turbine section downstream).

On the cool side, the same thing happens-- the turbo spools slower because it has to suck air through the bigger turbo's compressor.


If you have only mild surging, it should be completely eliminated in twins.

If you have severe surging, twins might not be enough to take it out-- you'll need to swap housings as well, probably (go bigger).

jh