considering the lsxrt fast intake
Thread Starter
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Joined: Jan 2007
Posts: 403
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considering the lsxrt fast intake Im in the middle of a 370 swap into a gbody monte carlo, and im considering a fast intake. My set up is as follows, thompson 370, tsp 228r cam on a 112, prc stage 1 ls6 heads milled for 11-1, 8.1 marine injectors.
I still have the original lq4 truck intake with a dbw 78 mm throttle body, and i need some advice on whether or not to upgrade to the fast. I have seen poets that claim a 30 horsepower gain, thats pretty significant.
i would have to use an adapter to mount my 3 bolt 78mm tb to the 4 bolt fast flange, or would i need a larger throttle body to see the benefits of the fast? I could buy a 90 mm ls2 dbw throttle body with an x-link as an upgrade. But is it all worth it for me?
As i see it, i have 3 options.
1. Leave my stock intake and throttle body
2. Buy the fast intake and use an adapter to run my old throttle body.
3. Buy a fast, an ls2 90mm dbw tb, and an x link. This is obviuosly the best option, but its also a pretty big pile of money.
Sorry about the lenghty post, im just looking for some advice.
I still have the original lq4 truck intake with a dbw 78 mm throttle body, and i need some advice on whether or not to upgrade to the fast. I have seen poets that claim a 30 horsepower gain, thats pretty significant.
i would have to use an adapter to mount my 3 bolt 78mm tb to the 4 bolt fast flange, or would i need a larger throttle body to see the benefits of the fast? I could buy a 90 mm ls2 dbw throttle body with an x-link as an upgrade. But is it all worth it for me?
As i see it, i have 3 options.
1. Leave my stock intake and throttle body
2. Buy the fast intake and use an adapter to run my old throttle body.
3. Buy a fast, an ls2 90mm dbw tb, and an x link. This is obviuosly the best option, but its also a pretty big pile of money.
Sorry about the lenghty post, im just looking for some advice.
I wouldn't.
If you want a good throttle body on a budget, look at the Ballistic Speed 92mm. They are a sponsor here and the TB is not widely known, but it should be because it is excellent.
https://ls1tech.com/forums/generatio...ttle-body.html
If you want a good throttle body on a budget, look at the Ballistic Speed 92mm. They are a sponsor here and the TB is not widely known, but it should be because it is excellent.
https://ls1tech.com/forums/generatio...ttle-body.html
Thread Starter
TECH Regular
Joined: Jan 2007
Posts: 403
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As an alternative to the fast route, what if I used a tbss intake that already has the dbw 90mm tb?
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Joined: Jan 2007
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IM also considering the car fast lsx, seems like used fast car Intakes sell for a reasonable price. For the difference in price from a used car fast vs truck fast, I could make my truck accessories work with the car intake.
Sorry everyone, I guess IM at a point where I have several different options and IM not sure which way to go.
Sorry everyone, I guess IM at a point where I have several different options and IM not sure which way to go.
We have had some issues tuning with the FAST truck intake. At idle on engines with a large cam, it causes the KPA to jump all around. The intake manifold sucks in and expands (thin plastic). Stock cam engines work fine but the larger cams cause problems. Anyone else had this problem?
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Joined: Jun 2011
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From: Katy, TX
my LSXRT is very rigid and does not flex at all. It was tuned by Patrick G with his custom 224/228 cam and it drives absolutely just as good as when I had the OEM Gen 3 truck manifold installed. Idle is perfect and smooth. Above 4k RPMs it really puts a smile on your face 
