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.

engine management is #1 IMO (dare I post without a rig)

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.)

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.

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.

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.

A good torque convertor makes a dump valve redundant. Yes programming is important, probably moreso on the gas side of things.

https://scontent.fyyc2-1.fna.fbcdn.n...0b&oe=5C4AB3CD

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.

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.

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Not to start a pissing match but I was entered in that race and all entries had to run a single turbo only.

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.:Cheer:

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........ :hehe: :hehe: :hehe:

Long before that, think late '96/'97 was when it was affordable. If you been around that long anyhow. :hehe: