5.0 Mustang Man

Hey guys I have a few questions. I just aquired 3 turbos, a silver bullet 66, a t6 flanged air research tv8102 (80mm inlet) 1.23 exhaust ar and .95 cold side ar, and the other is a t6 flanged turbo that I dont know what is(no tag on it). It is a big boy. The inlet is 85mm exhaust ar is 1.32 and cold side ar is .96 and exhaust wheel measures at 100mm. Right now I have a 62/14 over a s400. The setup works awesome, spools like stock and makes 70lbs. I want more power. What do you guys think about using the 66 for top turbo and one of the t6 ones for bottom? Should I use the bigger one? The exhaust housing is huge on this thing. I should have plenty of fuel, I have adrenaline box and mach 7 injectors, FASS 150/150 and so vp. Any opinions? Thanks.

Diesel- Dummy

If your not over 750 hp i would not do it the turbos you have now will do that mush power

5.0 Mustang Man

I have not dynoed the truck yet so I dont know. But I want more power than what it has so why not?

Mike Holmen

You'll see more HP increase if you go with a S366 or S364 for the secondary. The S400 is more than likely a S475, so that tons of air for 800rwhp. If you want lots more HP, use NOS spray.

You using the methanol spray currently?

The S362, its restricting top end air flow and choking up the exhaust flow.

5.0 Mustang Man

Not currently using the water meth because my egt's dont get bad. So should I just try out the silver 66 for top turbo for now and see what it does? Or are you saying to use a different 66?

Mike Holmen

There are two things to improve how the primary lights up. First a larger wastegate and open earlier. The second is to go with a larger secondary. A S366 in the secondary is gonna be laggy without enough fuel to spin the turbos. Most VP trucks are limited to around 700rwhp on fuel. Have you done a camshaft swap and done any head porting? Running mach 7's, you should consider a HRVP.

RowJ

I would leave well enough alone, unless going for a 'project' CTD. You've got a twin set that should give enough air for 8-900 hp, IMO.
Be careful what you wish for. Going too big on the secondary is laggy and no fun to drive.
I'd dump the Juice and get an Adrenaline...then add NOS with your Mach 7's if wanting more HP. As mentioned .... record top end for #2 only on a VP-44 truck is, I believe, 686 hp. Probably no amount of air will take you past that on diesel only.

RJ

Mike Holmen

I've heard that a few VP truck just break the magic 700rwhp barrier. Mach 7's are hard for the VP to keep enough fuel pressure in the injector lines. My mach 6's worked good with a HRVP, it improved my top end power, but that only small amount of ponies. the best dyno pull I've done was 677rwp, with 6's, SO pump and twins HX-40/BTH-3B at PDR dyno, running a edge drag box. There been a few VP truck come close to 1000rwhp, with everything in on the hairy edge of holding together. To get up to 1000rwhp, you need lots of drugs (methanol 50/50, heavy NOS shot) and bring a good VP. A street truck might get close to low 11's, running 1000rwhp. A tweaked in drag truck might be faster

Then again there's the rumour of the monster VP....

5.0 Mustang Man

I have an adrenaline on the truck now, I should of mentioned that. I guess Ill just leave it like it is and be happy with it. I cant keep a clutch in it at the power it is making now anyways. There are just a few **** cars up here that I want to beat with this thing and not resort to getting my Cobra out because it massacres them all lol.

Dglass89

what kind of clutch do you have? i knwo of a southbend 3600 that holds 800 hp so either your clutch must not be a dual dics or somethings happening causeing it to slip and cause premature wear... do you ride the clutch with your foot?

5.0 Mustang Man

I have a sb 3600 dd. I was easy on it for 5-600 miles and it worked awesome for about 2000 miles. Then started slipping. Only did a few boosted launches on it too. And I dont ride the clutch at all. Now it is too the point that it is slipping real bad even when the adrenaline is on 0. Turn it up and all it does is slip. Clutch has about 4k miles now. Im pretty ****** about it. I have a custom made dd out of a buddies truck that we are putting in this weekend and I have to figure out what to do with the southbend. We had the sb out about a month ago because my cluster broke in my trans and upon inspection the flywheel looked horrible. All cracked up and material missing. Disks were not horrible, they were missing material but not too bad. I dont know why this clutch is so bad when I was told they were so awesome.

RowJ

Talked to Peter at SB? Something sound wrong!

RJ

5.0 Mustang Man

Not yet. I have been waiting to get another clutch in there so I have something to drive. I rely on this truck so I cant just pull it and send it. But that should be taken car of this weekend and I will send it. Hopefully he takes care of it for me because I know this truck does not make more than 650 on a good day.

Big Blue24

Looks like you've just about maxed out the VP-44. If you want more, you should look into a P-Pump retrofit or sell the truck and buy an 03 or newer common rail.

If you P-Pump it with a build pump that will make 800+, it will take a lot of tuning to make it street/eco friendly. Big P-pumps tend to make lots of smoke when the AFC is not setup perfect.

You could be a guinea pig and try out Industrial Injection's new Dragon Fire VP-44 pump for 1900 bucks. Supposed to be capable of 800+ on fuel only.

If you do decide to mess with the twin setup, you'd see more gains and better driveability adding a larger bottom primary turbo. Something like an S480 or 115 lbs per minute will do the trick. If I'm not mistaken, your current S475 pushes around 96 lbs per minute.

Nitrous really is your next cheapest and biggest gain in HP. I bet you could hit 800+ with a well tuned single stage with a progressive controller or a well setup two stage system.