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Old 11-13-2012, 10:26 AM   #1 (permalink)
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Default What turbo for road racing?

What turbo are you guys running? I'm planning on getting my car set up for some Road Races nothing professional just for fun. I have an agp 50trim that makes 20psi around 3900-4k. There is a lot of lag to the turbo and I'm thinking I need something that will spool quicker to pull me out of the turns. The boost comes on hard at 3500 its makes 10psi then slams to 20 by 3900 and usually spins and torque steers, It pulls hard from that point to redline but when I shift it takes a second or 2 to build boost again. What are your subjection?

Thanks
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Old 11-13-2012, 10:37 AM   #2 (permalink)
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Sounds like a boost leak, You should be seeing alot more boost by 3500 RPM
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Old 11-13-2012, 10:39 AM   #3 (permalink)
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My stage 3 is just like stock boost but instead of 15 psi its 21. And ii like the power haven't tested around corners yet. Only been straight shots. Or you could look in to something like a persision I know they make a 50 trim like that spools up faster
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Old 11-13-2012, 10:43 AM   #4 (permalink)
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^^ 5431.


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Old 11-13-2012, 10:51 AM   #5 (permalink)
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Quote: Originally Posted by underSRTarmor View Post

Yea that one I've heard good stuff about that one seen good and track times
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Old 11-13-2012, 11:12 AM   #6 (permalink)
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I was thinking about the 5431 and I have been reading through the Precision turbo owners thread. I would like to keep the power levels around 380-400wph on 93 and I don't know if it will support that with pump gas. I was also thinking about the GTX3071r as well.

I don't believe that there is a boost leek as the spool of the turbo has been the same since I installed it. According to AGP this 50trim will max out around 480whp so that's where the slower spool comes from.
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Old 11-13-2012, 11:13 AM   #7 (permalink)
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I think the turbo you have is fine. I would check for boost leaks and I would also look into better boost management. Perhaps something that provides boost my gear like a N2MB boost box?
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Old 11-13-2012, 11:14 AM   #8 (permalink)
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Quote: Originally Posted by turbozetec View Post
I was thinking about the 5431 and I have been reading through the Precision turbo owners thread. I would like to keep the power levels around 380-400wph on 93 and I don't know if it will support that with pump gas. I was also thinking about the GTX3071r as well.

I don't believe that there is a boost leek as the spool of the turbo has been the same since I installed it. According to AGP this 50trim will max out around 480whp so that's where the slower spool comes from.

to achieve that power on 93 only you wont have a great spool...
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Old 11-13-2012, 11:21 AM   #9 (permalink)
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Quote: Originally Posted by Rhunter View Post
I think the turbo you have is fine. I would check for boost leaks and I would also look into better boost management. Perhaps something that provides boost my gear like a N2MB boost box?

I just don't want to wait for the spool in a road race. On a drag strip it wouldn't be a problem wind it out and shift but if I'm down low in the rpms I would like some bottom power to pull me out of turns with out downshifting to 2nd spinning.
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Old 11-13-2012, 11:37 AM   #10 (permalink)
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Quote: Originally Posted by turbozetec View Post
I just don't want to wait for the spool in a road race. On a drag strip it wouldn't be a problem wind it out and shift but if I'm down low in the rpms I would like some bottom power to pull me out of turns with out downshifting to 2nd spinning.

You can address this via better boost management. You mentioned in your 1st post that you have you boost set at 20 PSI? This leads me to believe you are using some sort of manual boost controller?

Wouldn't it be great to set your target boost for the gear you are in? You will make 10 or 12 PSI faster than you will make 20 PSI? See where I'm going?

Regardless of what turbo you end up getting, I think you will benefit from better boost control. Just my .02 cents.
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Old 11-13-2012, 12:11 PM   #11 (permalink)
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Quote: Originally Posted by Rhunter View Post
You can address this via better boost management. You mentioned in your 1st post that you have you boost set at 20 PSI? This leads me to believe you are using some sort of manual boost controller?

Wouldn't it be great to set your target boost for the gear you are in? You will make 10 or 12 PSI faster than you will make 20 PSI? See where I'm going?

Regardless of what turbo you end up getting, I think you will benefit from better boost control. Just my .02 cents.

Ralph and under are the men....I've learned alot of stuff from these guys the short time I've been on the forums.....id do what they're saying....road racing isn't about how hp you make...its about how efficiently you transfer what power you have to the road.
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Old 11-13-2012, 01:05 PM   #12 (permalink)
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Quote: Originally Posted by Rhunter View Post
You can address this via better boost management. You mentioned in your 1st post that you have you boost set at 20 PSI? This leads me to believe you are using some sort of manual boost controller?

Wouldn't it be great to set your target boost for the gear you are in? You will make 10 or 12 PSI faster than you will make 20 PSI? See where I'm going?

Regardless of what turbo you end up getting, I think you will benefit from better boost control. Just my .02 cents.


I agree with you I am using a mbc boost by gear is the way to go on any setup and a boost box is something I have been planing on getting for some time now. I just think a turbo with faster spool will work better on a road course.
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Old 11-13-2012, 01:24 PM   #13 (permalink)
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If I had to guess with my setup I'm making in the high 300's and with a turbo that makes 20psi at almost 4k and is good for almost 500whp I would like to have a turbo with fast spool and make around 400whp. This turbo pulls like crazy after 4k I would like to move the power band down 500rpms
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Old 11-13-2012, 01:42 PM   #14 (permalink)
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Quote: Originally Posted by dustin.b View Post
Ralph and under are the men....I've learned alot of stuff from these guys the short time I've been on the forums.....id do what they're saying....road racing isn't about how hp you make...its about how efficiently you transfer what power you have to the road.

Thanks man! Ralph has opened my eyes to alot. I just catch in fast.

I'm not always right tho.

But thank you. = )


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Old 11-13-2012, 02:04 PM   #15 (permalink)
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What manifold and a/r housing do you have? If you run a crappy log manifold and anything larger than a .63 and you are hurting your spool...
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