Forcedperformance T-28 17 psi actuator?

I currently use one on my FP B28 and it seems to do a very good job as compared to the stocker. Although I still have boost fade by redline, just not as bad.

Yes.. it is worth every $$$.. It will hold boost better..

Thanks guys sorry it took so long to respond ... i am def going to put that on the mod list>>>>>>>>>>>>>:>

Did yall notice a better spool up? An increase in airflow? Any overall butt in the seat increase? How is the install - any tips? Since I have a mbc I don't really need to play with adjusting it do I? - Just set it the lowest it can go and raise the boost with my boost controller?

Generation X said:

I currently use one on my FP B28 and it seems to do a very good job as compared to the stocker. Although I still have boost fade by redline, just not as bad.

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What is your boost set at, it still falls at redline. My t28 on the stock actuator would spike to like 24-25lbs on really cold nights then only hold 16 or so at redline.

tonymitss5 said:

What is your boost set at, it still falls at redline. My t28 on the stock actuator would spike to like 24-25lbs on really cold nights then only hold 16 or so at redline.

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My boost is set at, or atleast I think it's set at around 23psi, and by about 6k it falls to about 19 to 20psi. I'm actually still not sure if I'm really running 23psi, or that it's just where it spikes to and then I'm just actually running 19 to 20 psi. I've read in several areas that a smallish turbo is going to drop off some what by redline. But... I'm only seeing around 26.72lbs of air-flow on my logger, and I thought with this turbo that I should be seeing around 35 to 36lbs of air-flow atleast. I'm also running HKS 264/272 cams, so I think I should definitely be flowing more than what I'm seeing on my logger. I may try to adjust the actuator one more time. I also run a 75 wet shot as well, so I have to be careful because the nitrous adds another 2 to 3psi when engaged.

If you're tuning off an safc then you are running more airflow than that, are you?

mattgst said:

If you're tuning off an safc then you are running more airflow than that, are you?

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Yeah I'm tuning with a S-AFC. So... would that still make a difference in my air-flow readings that I'm getting off of my logger?

The airflow readings from your logger are not the actual values. The logger is telling you what the ECU thinks it's getting.

I have the fpbig28 with 17 psi actuator. It works great. I run it without a boost controller off the manifold and it holds 17 psi perfectly, no spikes.

If you are using a MBC in addition to the fp actuator, you may want to invest in one of those lightweight ceramic ball or light spring models for slight boost adjustment over 17 psi. Hallman and Joe P. both have these mbc's.

Also, make sure you have the nipple on the compressor housing securely blocked if your boost source is the intake manifold.

MattGST - the MBC is your boost controller

Bill

Billios996 said:

The airflow readings from your logger are not the actual values. The logger is telling you what the ECU thinks it's getting.

I have the fpbig28 with 17 psi actuator. It works great. I run it without a boost controller off the manifold and it holds 17 psi perfectly, no spikes.

If you are using a MBC in addition to the fp actuator, you may want to invest in one of those lightweight ceramic ball or light spring models for slight boost adjustment over 17 psi. Hallman and Joe P. both have these mbc's.

Also, make sure you have the nipple on the compressor housing securely blocked if your boost source is the intake manifold.

MattGST - the MBC is your boost controller

Bill

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Thanks for the info. Is there any way that I can see my actual values, or figure them out somehow? I would love to see how much air that I'm flowing with my set up. I'm also currently running a RRE MBC along with the 17psi actuator. I guess I'm running about 22 to 23 psi like I thought I was. I have my MBC tapped off of the turbo. Thanks for any info.

Where is your boost gauge tapped? Manifold or turbo?
Try switching your mbc source to the manifold also.

To figure out your airflow, you need to log the airflow, then take out the correction factor you have programmed into your AFC.

Generation X said:

Thanks for the info. Is there any way that I can see my actual values, or figure them out somehow? I would love to see how much air that I'm flowing with my set up. I'm also currently running a RRE MBC along with the 17psi actuator. I guess I'm running about 22 to 23 psi like I thought I was. I have my MBC tapped off of the turbo. Thanks for any info.

Click to expand...

Tell us what % you're taking out on your high table of your afc at the rpm you're getting 26.72lbs

The formula is peak airflow (lbs/min) / (1 - SAFC-II correction factor in decimal form) = actual airflow

Billios996 said:

Where is your boost gauge tapped? Manifold or turbo?
Try switching your mbc source to the manifold also.

To figure out your airflow, you need to log the airflow, then take out the correction factor you have programmed into your AFC.

Click to expand...

My boost gauge is tapped to the manifold.

mattgst said:

Tell us what % you're taking out on your high table of your afc at the rpm you're getting 26.72lbs

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Ok.... actually to be exact I was getting 26.56lbs of air-flow at 7068 rpm, and at 7000 rpm my HI setting on my S-AFC is set at -16%.

Generation X said:

Ok.... actually to be exact I was getting 26.56lbs of air-flow at 7068 rpm, and at 7000 rpm my HI setting on my S-AFC is set at -16%.

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so now you need to add that 16% back in to get your actual airflow

Billios996 said:

so now you need to add that 16% back in to get your actual airflow

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So.. do I add like 26.56 + 16 = 41.56. Is that what your saying, or am I still thinking wrong here. I'm not the greatest when it comes to math equations. Thanks again fo any help.

your in luck, I'm an engineer

26.56 psi= 0.16 x Xpsi (16% = 0.16)
26.65/0.16 = Xpsi

solve for X

I should have been an algebra teacher

Bill

I got 31.6 lbs min for you.