Trouble reaching target boost at the track only
Trouble reaching target boost at the track only
Anyone else have this problem?
On the street I reach my target boost of 30 psi no problem.
As soon as I take a run down the track I'm only seeing 25-26 psi.
Has anyone else experienced this? I spoke to a few friends and they said they have seen the same thing. They think it has something to do with reaching different load cells at the track compared to the street.
On the street I reach my target boost of 30 psi no problem.
As soon as I take a run down the track I'm only seeing 25-26 psi.
Has anyone else experienced this? I spoke to a few friends and they said they have seen the same thing. They think it has something to do with reaching different load cells at the track compared to the street.
There are a few factors. What kind of dyno\load, What kind of boost controller, What is the air Temp difference from the dyno pulls? The Dyno is a tuning tool, So try to get your A/F and timing close on the dyno then tweak it on the drag/road.
Most importantly what did you run at the track
Most importantly what did you run at the track
Also, the fact that "peak boost" on a pull happens at 3.5-5Krpm (depending on turbo) and when your at the track, "peak boost" is at like 5.5-6.5Krpm (where you land after the shift).
Anyone else have this problem?
On the street I reach my target boost of 30 psi no problem.
As soon as I take a run down the track I'm only seeing 25-26 psi.
Has anyone else experienced this? I spoke to a few friends and they said they have seen the same thing. They think it has something to do with reaching different load cells at the track compared to the street.
On the street I reach my target boost of 30 psi no problem.
As soon as I take a run down the track I'm only seeing 25-26 psi.
Has anyone else experienced this? I spoke to a few friends and they said they have seen the same thing. They think it has something to do with reaching different load cells at the track compared to the street.
I had trouble hitting my target boost at the track with my Greddy and Apex EBC. I switched over to ECU controlled boost and it solved my problem. I think a MBC will fix this problem also.
That's it right there. You will hardly ever hit your peak boost at the track. On the dyno, your peak boost occurs between 3-4K rpm. At the track you probably don't even see 3-4K rpm because you are shifting high. Most turbo's have some boost taper, so you will only see what boost you are making at 5-5.5K when you shift.
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I give up, every time I go to island, my boost just dies.
Tonight, I had to crank my mbc (hallman pro) alllll the way down to hit 34psi with AFR around 11.3 ~max. It took a huge number of turns on the mbc to achieve this. I could only trap 117.
About 10 miles from the track, i roll on it hard and the boost comes on a lot sooner, goes way higher, and the afr jump to 12 before i let off?!?! And the car pulls a lot harder.
I had to get out of the car and crank the mbc back four full turns to bring the boost down to drivable level (which happened to about where it was at the track).
This is soooo frustrating. Where is my power going? I thought it may be heat soak but shouldn't that hurt afr and not max boost/spool?? hmmm, i need to do some reading tonight.
Tonight, I had to crank my mbc (hallman pro) alllll the way down to hit 34psi with AFR around 11.3 ~max. It took a huge number of turns on the mbc to achieve this. I could only trap 117.
About 10 miles from the track, i roll on it hard and the boost comes on a lot sooner, goes way higher, and the afr jump to 12 before i let off?!?! And the car pulls a lot harder.
I had to get out of the car and crank the mbc back four full turns to bring the boost down to drivable level (which happened to about where it was at the track).
This is soooo frustrating. Where is my power going? I thought it may be heat soak but shouldn't that hurt afr and not max boost/spool?? hmmm, i need to do some reading tonight.
Time for a bigger turbo or a proper electronic boost control.. This has nothing to do with island and everything to do with turbo and MBC..
I give up, every time I go to island, my boost just dies.
Tonight, I had to crank my mbc (hallman pro) alllll the way down to hit 34psi with AFR around 11.3 ~max. It took a huge number of turns on the mbc to achieve this. I could only trap 117.
About 10 miles from the track, i roll on it hard and the boost comes on a lot sooner, goes way higher, and the afr jump to 12 before i let off?!?! And the car pulls a lot harder.
I had to get out of the car and crank the mbc back four full turns to bring the boost down to drivable level (which happened to about where it was at the track).
This is soooo frustrating. Where is my power going? I thought it may be heat soak but shouldn't that hurt afr and not max boost/spool?? hmmm, i need to do some reading tonight.
Tonight, I had to crank my mbc (hallman pro) alllll the way down to hit 34psi with AFR around 11.3 ~max. It took a huge number of turns on the mbc to achieve this. I could only trap 117.
About 10 miles from the track, i roll on it hard and the boost comes on a lot sooner, goes way higher, and the afr jump to 12 before i let off?!?! And the car pulls a lot harder.
I had to get out of the car and crank the mbc back four full turns to bring the boost down to drivable level (which happened to about where it was at the track).
This is soooo frustrating. Where is my power going? I thought it may be heat soak but shouldn't that hurt afr and not max boost/spool?? hmmm, i need to do some reading tonight.
What is it about these two parts that would cause the inconsistency? Again, I leave the track and it rolls out like a monster. I even have to turn the boost controller down by 4 full rotations for a safer level.
Obviously it's not Island itself, but the different loads/driving that come from drag racing. It'd just like to know why I build substantially less boost under these conditions? It's killing my et and mph. Is it shift points? Heat soak?
I'm running an FPred (and meth) with a hallman prorx(heavy spring).
What is it about these two parts that would cause the inconsistency? Again, I leave the track and it rolls out like a monster. I even have to turn the boost controller down by 4 full rotations for a safer level.
Obviously it's not Island itself, but the different loads/driving that come from drag racing. It'd just like to know why I build substantially less boost under these conditions? It's killing my et and mph. Is it shift points? Heat soak?
What is it about these two parts that would cause the inconsistency? Again, I leave the track and it rolls out like a monster. I even have to turn the boost controller down by 4 full rotations for a safer level.
Obviously it's not Island itself, but the different loads/driving that come from drag racing. It'd just like to know why I build substantially less boost under these conditions? It's killing my et and mph. Is it shift points? Heat soak?
in what gear down the dragstrip are you not seeing full boost?
are you logging it? or just looking at the gauge?
4th gear rolls vs. drag strip
AND
2-4th vs. drag strip
I wouldn't expect to build great boost right after a launch but I would in 3rd 4th and 5th (6spd ftl).
On the track according to my gauges I'm not building as much boost AND AFR are richer. I'm not logging it. Also, it also doesn't seem to matter what rpm I shift at, mph is still around 117 and 118.
Thanks
not in a MBC it never does.. An FP red can hold 30psi flat as a table to 7500 with a properly tuned electronic boost controller, with an mbc you need to crank it up to see the same peak pressure rowing through the gears as you would from a low rpm roll on the street, although different setups will have less of an effect then others. Also Binh has a T4 twin scroll housing.