Is anyone running high flow pipes and exhaust manifold. Tips on putting them on and benefits or noticeable difference. Any pros or cons?
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been looking at that set myself.Over the past two weeks, i've been researching this. From what i've read, the exhaust note will be a little bit deeper. For stock, non-tuned trucks, not much noticeable difference from the drivers seat and minimal MPG gain, on the dyno HP/TQ numbers do improve slightly. The biggest gains is If the truck has a tuner, such as EFI Live, there will be a more noticeable difference on the higher HP settings, where the program calls for more fuel. Increasing intake flow will see slightly more gains, but there is a limit with a stock turbo. I tow a 5th wheel and other than 5-6 thousand miles a year towing, the truck is a daily driver. For my money, and to help the EFI Live (Idaho Rob tune) I'm looking at the Dmaxstore package deal, just under 800 for teh LMM (the 200 bucks for the coolant hose is rather steep and makes me hesitant). #dmaxstore (Sale) Max-Flow Up Pipes & Manifolds W/ FREE Downpipe, 2004.5-2010 GM 6.6L Duramax | DMAX Store
Yes, unfortunately Idaho Rob no longer tunes by the last report, you could always give them a phone call to verify this.been looking at that set myself.
Btw, i read somewhere that Idaho Rob no longer tunes. Something about EPA? Is this true? if so, where would one recommend going for EFI live tunes? i'm looking to do minor mods but want dpf/egr gone.
Drive pressure is the pressure build up between the head and the turbo. More efficient fixed vain turbos and exhaust systems will run close to 1:1 boost to drive pressure, on variable turbos they generally run higher numbers because the exhaust side will close to help with quicker spooling. There is no set number carved in stone, but when you start pushing higher drive pressure numbers motors don't tend to last as long, and the odds of cracking a piston or bending a rod go up significantly.Drive pressure? im familiar with boost but not drive? is that the pressure on the exhaust side? Upstream or down of the turbo?
Yes, that is the exhaust side. Generally people measure boost near the y bridge, which is the compressed air after it is compressed by the turbo and runs through the intercooler just prior to going into the motor.Thanks for the explanation but if the drive pressure is between the head and the turbo... then where do you measure boost? Or is 'between head and turbo' on the exhaust side, not intake?
I have the same thought except i'd be lying bout the EGT part. i'm not knowledgeable on why cooler EGTs are better other than cooler engines typically last longer ... Regardless, *hat tip* for the below information.reliability and cool EGT's are in mind with most mods to my truck.
Tune 3 (PPEI - stock trans tune) climbing a pretty good grade to my house (daily commute - 7% grade), 3000ft elevation, 65mph, 1,580 rpm.
Avg Boost: 11psi
Drive Pressure: 7.8psi
EGT (maniford): 1,150
EGT (downpipe): 789
Avg Boost: 11psi
Drive Pressure: 7.3psi
EGT (maniford): 1,090
EGT (downpipe): 748
Throttle response... No scientific data here, just seat of the pants. Feels like from a dead stop (stop light) with no boost, it might take maybe 1/2 second longer to start building boost, but once you have some boost (driving down the road running 3lbs for instance) and you put your foot into it, it feels like it spools up way quicker. From watching gauges, looks like I am running a little under 10% lower drive pressure (every day driving, towing, hauling) and on average about 100 deg cooler EGT's at the manifolds.
Ran the test and tune at the drag strip. Some people were saying the maxflow manifold/up pipe combos were raising EGT's, they definitely don't. Before I did the DmaxStore Max Flow uppipes/downpipe/manifolds, I went to the track, ran the 1/4 mile on my PPEI stock trans tune 1 and tune 4. This was my baseline. The readings I got were Manifold EGT, downpipe EGT, max boost, drive pressure.
Tale of the track
Tune 1 - Stock ([email protected]) - Dmax Store MaxFlow ([email protected]) = .175 seconds faster
Manifold EGT - 1,290 - 1,175 = 115 deg cooler
Downpipe EGT - 629 - 578 = 51 deg cooler
Boost - 33 - 33 = same
Drive Pressure - 62.9 - 61.2 = 1.7 psi lower
Tune 4 - Stock ([email protected]) - Dmax Store MaxFlow ([email protected]) = .112 seconds faster
Manifold EGT - 1,500 - 1,480 = 20 deg cooler
Downpipe EGT - 745 - 735 = 10 deg cooler
Boost - 37 - 37 = same
Drive Pressure - 72.2 - 69.8 = 2.4 psi lower
So dropped temps, decreased drive pressure, and dropped my 1/4 mile times, thats a win in my book. Those numbers are just peak readings in the 1/4 mile, day to day driving I noticed sometimes more drastic drops (towing up grades in higher temps). Same tunes, same tire pressures, only difference was when I did my stock baseline the ambient air temp was 68 deg, and when I ran today (maxflow upgrades), ambient air temp was 77 deg, so almost 10 deg warmer. I also had a 1/4 tank of fuel (according to the gauge) first time to the track and was almost full tank this time. So 10 deg warmer air and prolly 20-25 gallons more fuel.
BTW, that setup with stock trans tunes put down 485hp at the wheels on the dyno.
You have additional sensors to obtain this info on boost/drive pressure or can you get them from PIDs with an EDGE-type device? considering you have manifold and dp temps i assume you have additional sensors but i'm not completely familiar with what all is available on stock. Need to pick me up one of them Edge devices before i do anything so i can have baseline info like you.Yes, that is the exhaust side. Generally people measure boost near the y bridge, which is the compressed air after it is compressed by the turbo and runs through the intercooler just prior to going into the motor.
You can see your boost using a Edge Insight (or similar device) among many other PIDS. The EGT and Drive pressure you would need to get probes to be able to see. DP temp (I have my sensor where the main exhaust hits the downpipe) I dont see a huge benefit in monitoring, I just did it as a beta since I was changing manifolds, down pipe and up-pipes. The gauges I normally keep a close eye on when towing or driving it hard are oil temp (added sensor), drive PSI (added sensor), EGT (added sensor), then fuel rail pressure, boost, trans temp and coolant temp. I keep the coolant temp displaying on my Edge Insight because the dash gauge is no where near close to accurate.You have additional sensors to obtain this info on boost/drive pressure or can you get them from PIDs with an EDGE-type device? considering you have manifold and dp temps i assume you have additional sensors but i'm not completely familiar with what all is available on stock. Need to pick me up one of them Edge devices before i do anything so i can have baseline info like you.
I did, so did the misses. She was out of town when the manifolds, down and up pipes were replaced. I didn't tell her I did anything to the truck, we went out to the movies, and before I was even up to speed on the highway she was asking what I did to the truck, of course I asked what she meant, her exact response "it sounds deeper and more rumbly".One question, did you notice any changes with the exhaust tone?