Big Single or Twins?

[towner]

Posting for a friend(yes he's going to subscribe)



I have a 97 12v engine 5 speed with the 215 pump with a hybrid hx35 with a 40 compressor, gauges, 3 gsk, 4" exh. , K&N intake and a #10 plate the boost goes to 40psi and the exh temp will climb to 1500 in a blink of an eye... . I'm swinging between a HTB2@ with a 64/14 and twins. If I do twins I have to have the head O-ringed but the single with probably bring down my EGT's about 200 degrees. do you think I should go all the way and get the 66mm on the HTB2 or jump in and just get twins with my exsisting primary turbo? The rig is used to pull my toys around probably pulling tha max 12k load

 

[mattymac]

If you have the money do twins! Absolutley without a doubt! Your hybrid would make a nice top turbo and with the loads your seeing I could bet you WILL have turbo surging especially up around Tahoe City in the hills. I have it with my 66 towing the snowmobile trailer.

 

[Jim Fulmer]

As much as I like the singles that are out now I'd have to say if your towing that much and want quick spooling and able to use allot of power towing I'd go with a small than you listed single and a 3B or S400 (B2) on the bottom.



Jim

 

[RHARVEY]

Here is my setup...

97 5 speed 215 pump,#10 plate,3k GSK,110hp injectors and PDR Towing twins. . I seen nearly 300* drop in flat towing egts. Pulling a 6% grade was 3rd gear and floating the pryo needle in and out of the 1250* @ 42 mph. Now with this setup I use 4th @ 55 mph and see not over 1100* pulling the same hill...

All I have done to the head so far is a set of studs and that is it. But I also have a set of 50lb blow off valves too.

When we put the system on the truck I changed my 14cm gated housing to a 12cm gated housing. I wanted the boost up as soon as I could get it. I wanted things really working at my towing rpms which is 1800 rpms.

At this point... I would not want to drive a truck without twins. . My truck now drives more like a sports car than a truck. .



Rick

 

[Hohn]

As much as I like the singles that are out now I'd have to say if your towing that much and want quick spooling and able to use allot of power towing I'd go with a small than you listed single and a 3B or S400 (B2) on the bottom.

Jim

No joke. And the lower flow of a 12V head isn't going to help any potential surge issues with a larger single (SPS66, for example).

 

[towner]

Anyone towing with a big single or does my buddy crank up his gold card and my time?

 

[mattymac]

I cant tow my 26 ft. snowmobile trailer in the hills without my SPS 66 surging at around 13-18 lbs of boost while lugging 15-1800, once its beyond that then im gone and EGT's are manageable but still higher than I want them to be. Im not dissapointed in this turbo by any means but twins are in my future.

 

[Jim Fulmer]

I cant tow my 26 ft. snowmobile trailer in the hills without my SPS 66 surging at around 13-18 lbs of boost while lugging 15-1800, once its beyond that then im gone and EGT's are manageable but still higher than I want them to be. Im not dissapointed in this turbo by any means but twins are in my future.

Correct me if I'm wrong but the only turbo I know of that like that low of RPM is an HX-35... ... I know the 40's like 1800+ RPM.



Jim

 

[Forrest Nearing]

as stated above, if you're going to be towing regularly and want to USE a fair amount of power, twins are the only way to go...



you can do a budget set of twins with your hybrid on top and an HT3B on bottom...



I really don't think you want to tow w/ a 66mm on a 12v... a 64mm would probably work well, but if you've got the time and ability, you can hang an HT3B under your current turbo for less than a 64 or 66mm single will cost you.



I'm going w/ a SPS66 because I don't tow anything, and at this point in my life, I've got more money than time... (well... slightly... not enough money to justify twins!) if I towed, I would go w/ a budget set of twins

 

[SRadke]

The 64mm turbo from HTT is a great turbo for towinf but you aren't gunna do it at 1600 rpm. Hold it higher than 1800 and she'll purr like a kitten. That said, I've since switched to twins and will not go back. You can get a twin kit to utilize that 35/40 hybrid that would be a sweet towing powerfulll setup for not a lot more money than a big single. The head work is the only downfall.



-Scott

 

[mattymac]

Correct me if I'm wrong but the only turbo I know of that like that low of RPM is an HX-35... ... I know the 40's like 1800+ RPM.



Jim

If Im really luggin it down then it will surge around 1500, I mean Really makin it grunt. For the most part its around 18-1900 at 15 lbs in 5th or 6th gear and I cant drive through it, just have to back off a bit. I need to get it changed over to a SPS 62 but my EGT's are as hot as I want them to be right now with the 66. I will either have twins on this truck or just hold off and have them on a new mega cab with an all billet auto.

 

[Swayse]

Gotta go compounds. I had PDR street compounds, sold them to buy an ATS Aurora 5000. Big mistake. I thought it would at least make a nice nitrous turbo, nope blew it up with a small shot of nitrous. So much for the unbreakable turbo.



I bought some used Powerbypoole B1/B2 compounds off of the TDR classifieds, can't wait to try them.

 

[towner]

We're trying to figure it out? Have two 12v std trucks both with 3. 54 and ext cabs. We want to put a big single on one and twins on the other? trying to figure out the time and $$$$$

 

[AFarmer]

Twins. Low EGT's towing even with a good size injector. You do some towing with a set of twins and the bottom charger really pics up the slack that a single just can't do unless its at higher RPM's.

 

[Cooker]

you can hang an HT3B under your current turbo for less than a 64 or 66mm single will cost you.



I'm going w/ a SPS66 because I don't tow anything, and at this point in my life, I've got more money than time... (well... slightly... not enough money to justify twins!)

Are you getting your SPS66 for free

 

[Forrest Nearing]

Are you getting your SPS66 for free

I wish!!!



for a long time I had more time than money... these days it's the opposite... more money than time. no time to build my own twins, and the SPS66 should make as much or more power than a low-buck set of twins



and I don't have the money to spend $3-4k on a set of pro-built twins...

 

[Cooker]

I was just giving you a hard time but I see where you are coming from.

 

[cmonroe]

I've had 4 combinations of twins now between my old 12v and my common rail. Without a dought any small sets of twins like your 35 with a 3b or b2 will tow much better than a single. You can build or even buy a set reasonably priced, if your on a budget. After driving and towing with compounds I do not think I'll ever go back to a big single.

 

[NPloysa]

I've had 4 combinations of twins now between my old 12v and my common rail. Without a dought any small sets of twins like your 35 with a 3b or b2 will tow much better than a single. You can build or even buy a set reasonably priced, if your on a budget. After driving and towing with compounds I do not think I'll ever go back to a big single.

But will your 3rd gen do 0-60 in 4 seconds flat, like your 98 did when you took me on a demo? You know, when your transmission was going south and shifted like a mad man without synchros? I wish I videotaped that, Craig!



By the way, shouldn't ATS' new variable boost turbo work for this guy?



Nick

 

[cmonroe]

Caught me, yea the MST is a good single for towing. It will have good top end but not like the Aurora 5000 does. As far as the new common rail, it doesn't come out of the hole like the 12v did. It still has the defueling issue so 0-60 is slower more like 5. 8 seconds (not that impressive). But once she is rolling down the highway she gets along nicely. I will add that it is much nicer as a daily driver.