Twins drive pressure

[Shibbyutman]

I have read in a few threads that it can be dangerous to run a high drive pressure when you are running a set of twins. I have a set of PDR twins coming eventually, HX40 and HT3B. Later down the road when I install them, unless Brian is still looking to make a deal , I would rather like to not blow a head gasket. Obviously with my current fueling situation that is going to be hard, but I have built this truck doing everything only once and if I blow the head sky high because of something I am not going to be happy camper.

So, when monitoring drive pressures, what should they be at and what is the best way to control them?

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2003 Dodge Ram 2500 4X4, PDR Cobra Stage 2 Twins, Dual 7" Black Stacks with rain caps, Banks Big Hoss Bundle, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.

[awenthol]

Are you going to read DP at each point? IE, right before one AND right before two...or just manifold?

You'll want a 1:1 boost:drive pressure ratio....good luck tuning

[Shibbyutman]

I will read it at as many points as necessary to keep it from blowing things up so if I have to have as many gauges as BBRam's truck so be it

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2003 Dodge Ram 2500 4X4, PDR Cobra Stage 2 Twins, Dual 7" Black Stacks with rain caps, Banks Big Hoss Bundle, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.

[awenthol]

I dont' think you'd need too many gauges...one boost after each turbo and one drive that you could switch between the two. Set the small turbo wastegate when the pressures get high enoguh that it's no longer 1:1 (or fairly close) then move the DP to the big-en and set it to 1:1..or a little higher if you want. Then either remove the DP or keep it reading at the manifold....

I've never set twins before, but that's how I would think it's done...if someone that has done it wants to chip in, please do so!!

[Shibbyutman]

rock on, thanks for the info

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2003 Dodge Ram 2500 4X4, PDR Cobra Stage 2 Twins, Dual 7" Black Stacks with rain caps, Banks Big Hoss Bundle, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.

[Neel]

ive heard you dont want to leave the drive pressure gauge hooked up, because it gets all sooty and doesnt work after awhile.

but correct me if im wrong

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2006 cummins 3500 laramie murdered out,48re,9'' lift, 40'' baja claws/rockstar wheels,full kicker/pioneer sound system,HID's,PPE xcel. with power puck stack,nitrous,boost fooler,FASS,5'' mbrp,intake,autometer gauges need to install 66/71/14

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Last edited by Neel : 11-10-2008 at 08:06 PM.

[awenthol]

Yes, it will get sooty...I had mine hooked up for just a day and it was starting to narrow the tube. I don't see why a person couldn't try to "poke it open" every once in awhile, though? I've been trying to rig a setup for reading drive pressure through the pyro hole and when I do, I'm gonna leave it on permanent...guess we'll see how long it lasts

[alcook59]

Several thousand miles here in the manifold. I used a large piece of copper tubing and coiled it around several times (probably 8 feet). Never a problem.

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2006 RCLB 4x4 Twins/Flux3.5s/billet ATS trans/MPI stock-s-400 twins/guages/other stuff 700+HP
0-60 3.27 seconds 11.93@115.98mph

[BBRam]

Rule of thumb from what I have heard. 1:1 from Drive Pressure (exhaust manifold) to overall boost reading (intake manifold)
Bottom charger should be 1/2 of overall boost reading at the intake.

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03-3500, DRW, QC, 4x4, DTT Trans, Mag-Hytec, R700 BD Twins, BD IC Boots, BD Billet Flexplate, Lockup Switch, SMARTY TNT-R BETA/TS MP-8, Eliminator Fuel System, Floor It Stage 3 CP3 & Rail Cap, BIG Stix's by FTE, ARP Head Stud's, Springs, Fluidampr, ATS ARC-FLOW, AFE, Boost, Drive Pressure, Pyro, Fuel Pressure, Tran's Temp, Rail Pressure Gauge, GDP Ladder Bars, GrandRock 7" Miters. Old #'s (R/T .021, 60' 1.76, 1/4 ET 13.14 @ 100.45 mph)

[Shibbyutman]

That makes sense to try and divide the load up evenly between the two turbos.

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2003 Dodge Ram 2500 4X4, PDR Cobra Stage 2 Twins, Dual 7" Black Stacks with rain caps, Banks Big Hoss Bundle, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.

[Diesel Ram]

alcook59 do you have any pictures of your setup for this?

[awenthol]

Here's how I had/have mine...6' copper kit from AutoMeter + plastic kit to gauge...