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I had a chance to go back to the dyno today after the intercooler upgrade. I do not know why the torque # shows up so damn funky this time. Tuner said rwtq was 627 ft/lbs if I recall. These are the changes made since the last time on the dyno.
1. Trick 5" Race Intercooler (this alone I'm confident resulted in 100+whp increase)
2. Fresh BR7EF plugs gapped to .025"
3. Installed a Hallman mbc *before the dyno, as me and the dyno tuner could never get the Innovate to work right for whatever reason during the first dyno day. We think that on initial tip-in, the uego sensor reads a slight lean spike that pushes the controller into boost cut-off.
First dyno day in April resulted in 552/605 @ 15psi. Today was 30* warmer (110* and humid), so SAE numbers would be even higher. This time we started at gate which was a 9lb spring which made 10.5lbs of boost @ super rich 10.8:1. That yielded 556rwhp/581rwtq. Then the tuner had me gradually turn up the boost until 15lbs while keeping things real rich. Initially AFRs were 10.8:1 and made in the 620s @ 15psi and he made a few more passes and kept leaning it out until we ended up at 11.3:1 and 650rwhp/62xrwtq at 15psi. He said the map sensor was pegged, which I already knew as I have been working with Atomic on street tuning prior to the dyno and he recommended a map sensor upgrade. I had planned to install one of Gadgetized's 2.5 bar map sensors but I ran out of time and it actually worked out perfectly because I'm out of fuel pump at this hp/boost level. Tuner said he watched the fuel pressure gauge and saw that pressure was dropping 1psi @ 14psi and 2psi @ 15psi even though AFR's were safe. He said the Walbro 450 F90000267 typically opens the bypass valve anywhere in the low to mid 70s and that an easy fix would be to install the higher pressure F90000274 which he says should allow me to go up to 750rwhp with my BAP. So even though I was limited by the map sensor, I found the limits of a Walbro 450 F90000267 and Kenne Bell 20V Boost-A-Pump at 650whp in my particular application. From my research that's about what a BAP and Walbro 450 are capable of. Possibly another ~50 or so more if base fuel pressure is dropped down a bit and depending on the injectors. I think I read about a guy on tech with a Walbro 450 F90000267 and a BAP going up to 750rwhp on E85 but he did say fuel pressure was dropping quite a bit at that point. Anyways, here is the dyno graph which is a bit confusing as the baseline run shows torque in a normal number but I'm not sure why the highest hp run only shows it in a weird number. When the curve was on the tuner's screen it showed in the 620s but I can't remember the exact #. I want to say thank you to Atomic and also to Eddie @ Addiction Motorsports. I'm headed back to the track for a night race in early July so I'm hoping the air is a bit cooler and I can go low 11s.
I had a chance to go back to the dyno today after the intercooler upgrade. I do not know why the torque # shows up so damn funky this time. Tuner said rwtq was 627 ft/lbs if I recall. These are the changes made since the last time on the dyno.
1. Trick 5" Race Intercooler (this alone I'm confident resulted in 100+whp increase)
2. Fresh BR7EF plugs gapped to .025"
3. Installed a Hallman mbc on the dyno, as me and the tuner could never get the Innovate to work right for whatever reason. We think that on initial tip-in, the uego sensor reads a slight lean spike that pushes the controller into boost cut-off.
Last dyno run was 552/605 @ 15psi. Today was 30* warmer (110* and humid), so SAE numbers would be even higher. This time we started at gate which was a 9lb spring which made 10.5lbs of boost @ super rich 10.8:1. That yielded 556rwhp/581rwtq. Then the tuner had me gradually turn up the boost until 15lbs while keeping things real rich. Initially AFRs were 10.8:1 and made in the 620s @ 15psi and he made a few more passes and kept leaning it out until we ended up at 11.3:1 and 650rwhp/62xrwtq at 15psi. He said the map sensor was pegged, which I already knew as I have been working with Atomic on street tuning prior to the dyno and he recommended a map sensor upgrade. I had planned to install one of Gadgetized's 2.5 bar map sensors but I ran out of time and it actually worked out perfectly because I'm out of fuel pump at this hp/boost level. Tuner said he watched the fuel pressure gauge and saw that pressure was dropping 1psi @ 14psi and 2psi @ 15psi even though AFR's were safe. He said the Walbro 450 F90000267 typically opens the bypass valve anywhere in the low to mid 70s and that an easy fix would be to install the higher pressure F90000274 which he says should allow me to go up to 750rwhp with my BAP. So even though I was limited by the map sensor, I found the limits of a Walbro 450 F90000267 and Kenne Bell 20V Boost-A-Pump at 650whp in my particular application. From my research that's about what a BAP and Walbro 450 are capable of. Possibly another ~50 or so more if base fuel pressure is dropped down a bit and depending on the injectors. I think I read about a guy on tech with a Walbro 450 F90000267 and a BAP going up to 750rwhp on E85 but he did say fuel pressure was dropping quite a bit at that point. Anyways, here is the dyno graph which is a bit confusing as the baseline run shows torque in a normal number but I'm not sure why the highest hp run only shows it in a weird number. When the curve was on the tuner's screen it showed in the 620s but I can't remember the exact #. I want to say thank you to Atomic and also to Eddie @ Addiction Motorsports. I'm headed back to the track for a night race in early July so I'm hoping the air is a bit cooler and I can go low 11s.
Low 11s i don't know, you'll need a significant jump from your 114 trap up to around 120.
I think with good air I can. I picked up 100rwhp and the mid range gains are very noticeable as well. Either way if I can run a tenth or two quicker and with more consistency (lower IATs) then the intercooler swap will have been worth it.
Thanks for your guidance and tuning! After you pointed out that the fluttery sound was the wastegate opening, I realized I still had the 6lb spring in the wastegate and I couldn't make over 12.5lbs when testing last night. I ended up putting the 9lb spring in last minute which is more friendly with the manual controller.
Yea with a manual controller you want to get as close as you can to your target boost with springs then tweak from there. With an electronic controller you generally want the softest spring in there and let the controller do the work.
Looks like you could carry your rpm out more if cam set up would allow it.
It's staying pretty flat up there.
I'm not too sure why the dyno operator decided to let out? None of the pulls showed lean activity so maybe he just saw power dropping off. Also, these runs are being made in 3rd with a stock (shortened) driveshaft with wheel speeds north of 140mph so that might have played a part in it.
At the track I just put it in D so it will shift wherever the shift points are set to. Although I remember reading something that stock48 wrote where he said that his truck went quicker when he lowered the shift points down?
Jun 20, 2016 | 08:07 PM
