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Old 10-03-2018, 02:06 PM   #1
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Are big singles the future?

Just looking around at the big dogs new setups for drag racing I am noticing a lot of crews going from compounds and triples to large singles with nitrous. I get the appeal of a big single as I am moving in that direction as well, less weight, less chance for failures.

My question is, what kind of nitrous setups and cam profile are they using to make it all go. I am looking at camshafts today to help keep my single S485 lit, and I figured I would ask to see what the fast guys are doing.
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Old 10-03-2018, 03:59 PM   #2
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engine management is #1 IMO (dare I post without a rig)
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Old 10-03-2018, 04:23 PM   #3
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I tend to agree. Most of the big names in this game are running large singles, more displacement, and electronically controlling fuel. (Common rail)
Sure makes swapping a turbo easier. (No race rig here either, just a spectator.)
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Old 10-04-2018, 03:00 AM   #4
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Transbrakes, bump boxes, dump valves and nitrous are a big reason why Big singles are working....try a 102mm on a normal truck and it’s probably not going to work.
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Old 10-04-2018, 07:57 AM   #5
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Quote:
Originally Posted by JQmile View Post
Transbrakes, bump boxes, dump valves and nitrous are a big reason why Big singles are working....try a 102mm on a normal truck and it’s probably not going to work.
Yeah, I saw Lavon mention some things about the Rossler TH400 they use in their new truck, but even across the board from 11.90, 10.90, Super Street, 5.90, etc. Everyone seems to be using singles.

Its just interesting how things are changing.
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Old 10-04-2018, 09:02 AM   #6
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I think that with the advancement in cylinder head designs along with better camshafts guys are seeing that they don't need huge boost pressures to make big power. Single turbos coupled with a big wastegate and some nitrous can accomplish the same things that twins and triples were doing. We've gone 10.00's in a 7000lb truck with a box 72sxe and some nitrous. Pretty hard to argue against single turbos when guys are doing amazing things with them.
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Old 10-04-2018, 12:04 PM   #7
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Is any part of this that more and more guys are building dedicated race trucks vs a weekend race truck that is still decently streetable? I don't know, just speculating.
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Old 10-04-2018, 12:56 PM   #8
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Quote:
Originally Posted by JQmile View Post
Transbrakes, bump boxes, dump valves and nitrous are a big reason why Big singles are working....try a 102mm on a normal truck and it’s probably not going to work.
A good torque convertor makes a dump valve redundant. Yes programming is important, probably moreso on the gas side of things.

Click the image to open in full size.

Here's a little SBF with a 91mm turbo and a TIGHT non-optimal convertor. Maxes out a 3 bar map in 4 seconds from idle. No nitrous.

Most he could make on the brake before I tinkered was about 6 psi.
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Old 10-04-2018, 01:01 PM   #9
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Quote:
Originally Posted by Hurley View Post
engine management is #1 IMO (dare I post without a rig)
as in these super secret standalone ECU's? or....
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Old 10-04-2018, 01:03 PM   #10
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as in these super secret standalone ECU's? or....
No, as in the tuner's ability to make the power train work in concert with all associated variables.

Sent from my XT1254 using Tapatalk
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Old 10-04-2018, 03:11 PM   #11
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Quote:
Originally Posted by blackmega3500 View Post
Actually if you think about it, big singles go back to Bradenton in 2010 iirc where I think it was a mid 10 run by Aron Nick using a 478. Everyone else used compounds, and thats when the big single explosion took off. Then the whole 5.9 vs 6.7 can spool XYZ better debate started. Thank God Australians solved that issue.
Not to start a pissing match but I was entered in that race and all entries had to run a single turbo only.
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Old 10-04-2018, 03:27 PM   #12
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Aron, Bruce, and myself were sponsored with turbos from Bullseye. It was a fun event. Especially for us northern boys at that time of the year.
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Old 10-04-2018, 04:27 PM   #13
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Quote:
Originally Posted by blackmega3500 View Post
Thanks for clarification! I think you understood my point.

I just remember mainly the 10 he ran not only blew people's minds, but put bullseye and b&b tooling on the diesel radar.
It was also 66mm inducer, 2.6 sled pull type rules. I ran that race also, was a fun time and wish the class would have took off.
 
Old 10-04-2018, 05:10 PM   #14
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It was also 66mm inducer, 2.6 sled pull type rules. I ran that race also, was a fun time and wish the class would have took off.
Didn't you buy a turbo off ol' blackmega3500pingasucker and almost miss the race cause he was a dewshy seller?


See that is how it usually goes, once a dewshbag, always a dewshbag........
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Old 10-04-2018, 05:13 PM   #15
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Is it safe to say that's when diesel racing was "affordable"?

Long before that, think late '96/'97 was when it was affordable. If you been around that long anyhow.
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Old 10-04-2018, 07:29 PM   #16
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I did buy that 466 bullseye charger from you blackmega, ran a 11.54 with it at 6000lb.
 
Old 10-04-2018, 07:30 PM   #17
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With a junk ass 160hp pump
 
Old 10-04-2018, 07:31 PM   #18
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It wasn't no batmo wheel though.
 
Old 10-04-2018, 08:20 PM   #19
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Holy cow I forgot I even had that one. My old truck saw so many... at least 6 or 7 I can think of.

It was a 6 blade race cover iirc!

Glad it worked for ya!
Oh snap! Who's wrong again, Slapper????

If I recall you stalled on sending the turbo, my man wanted to install it on his truck and test before that race......

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Old 10-04-2018, 11:36 PM   #20
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Quote:
Originally Posted by RacinDuallie View Post
Long before that, think late '96/'97 was when it was affordable. If you been around that long anyhow.
It was reasonable until 2005 id say. Though transmissions were high. Not much higher than today, but they were the limiting factor.

A single with nitrous went 9s in 2008/9 in a street legal truck. But it was a rough ride and not consistent.

As larger displacement engines with better controls have come along, it has become simpler to run big singles.

Turbocharging is not "free' horsepower. Turbochargers take heat energy to run. If you can make a big single work, then you are making the most of your energy. I see that as the direction that we are headed.
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