ls6 intake on 1999 ls1
Instructor
Joined: Aug 2012
Posts: 185
Likes: 0
From: Santa Clara Ca.
Nobody answered the OP's question about if a tune is needed afterwards. I've been tempted as well to do the swap. But from what I've read, it doesn't make any difference below 5K rpm. And I'm not clear if a tune will be required afterwards. Read this article on intakes. I have never reved my 97' above 5K and can't imagine doing so. Going above 4K scares me. It does not sound good for the motor!So if that's the case that the LS1 and LS6 are the same below 5K, why do the swap???
http://tpis.com/pages/2_17_06
http://tpis.com/pages/2_17_06
Burning Brakes
Joined: May 2007
Posts: 911
Likes: 27
From: Southern IL
Nobody answered the OP's question about if a tune is needed afterwards. I've been tempted as well to do the swap. But from what I've read, it doesn't make any difference below 5K rpm. And I'm not clear if a tune will be required afterwards. Read this article on intakes. I have never reved my 97' above 5K and can't imagine doing so. Going above 4K scares me. It does not sound good for the motor!
So if that's the case that the LS1 and LS6 are the same below 5K, why do the swap???
http://tpis.com/pages/2_17_06
So if that's the case that the LS1 and LS6 are the same below 5K, why do the swap???
http://tpis.com/pages/2_17_06
Burning Brakes
Joined: May 2007
Posts: 911
Likes: 27
From: Southern IL
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
It's more a matter of not being able to buy parts when I start breaking stuff from abuse! I get on it pretty often, but the sound of the engine and exhaust I have as I get into the 4K range makes it sound lke I'm over reving it. I have a Corsa Indy Pace catback with the Tiger Shark tips. Only other engine mods is a Halltech Stinger intake and a oil catch can which seems to be working as it collects a shocking amount of oil!!! I also did a 160 degree themostat and sent my pcm to ECS for a mail order tune. 47K miles on the clock right now.
Being in California, smog rules apply. But I may have finally found a smog tech that will inspect in my favor!!!
My plans have been to get a set of headers, either a Fast intake or an LS6 intake, a better cam, and either a better set of heads or have mine upgraded. Then do a local street/dyno tune.
And for the record, it doesn't scare me to drive the car hard. Panty comment!! It the repair bill that scares me if I break something. The Corvette tax is brutal!
Being in California, smog rules apply. But I may have finally found a smog tech that will inspect in my favor!!!
My plans have been to get a set of headers, either a Fast intake or an LS6 intake, a better cam, and either a better set of heads or have mine upgraded. Then do a local street/dyno tune.And for the record, it doesn't scare me to drive the car hard. Panty comment!! It the repair bill that scares me if I break something. The Corvette tax is brutal!
Instructor
Joined: Aug 2012
Posts: 185
Likes: 0
From: Santa Clara Ca.
Nobody answered the OP's question about if a tune is needed afterwards. I've been tempted as well to do the swap. But from what I've read, it doesn't make any difference below 5K rpm. And I'm not clear if a tune will be required afterwards. Read this article on intakes. I have never reved my 97' above 5K and can't imagine doing so. Going above 4K scares me. It does not sound good for the motor!
So if that's the case that the LS1 and LS6 are the same below 5K, why do the swap???
http://tpis.com/pages/2_17_06
So if that's the case that the LS1 and LS6 are the same below 5K, why do the swap???
http://tpis.com/pages/2_17_06
Team Owner
Joined: Oct 2000
Posts: 29,937
Likes: 22
St. Jude Donor '03-'04
Cruise-In 1-2-3-4-5 Veteran
I did the swap and tune on my '98. I got about 10 horsepower across the curve, 14 at the peak. No way of telling what's attributable to the intake and what's attributable to the tune.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I don't want to hijack this thread but i also am doing the swap. Thanx to the op for starting this thread and all contributors. My question is that i've heard a lot of bad stories about the oil pressure sensors going bad in c5's and the pita it is to change. So, does it make good sense to do a sensor relocate while the intake is off? If so, where can i get a kit. Again, thanx to the op.
dpecorvettes.com is the kit I used. It came with a small length of wiring to extend the wires (about 5" or 6"). I got the one without the gauge. This one uses the C5 Corvette sender (has copper crush washer) if you ever need to replace it.
West Coast Corvettes also has a kit they sell. They don't say, but I think their kit uses a Buick sender which has pipe-threads, hence the sealant on the threads.
Getting your sender out of the hostile environment it lives in (heat, vibration, etc) goes a long way in extending the life. I have only had one occasion to replace a sender in approx 4 or 5 years.
Btw, don't worry about brass vs. aluminum debate. My Delco aluminum uinit is the one that lasted 4-5 yrs, and I've now had an Airtex (aluminum) unit for 6+ months with no issues.
TPE makes one that requires more work, but is a great design. Not sure if they are even in business any more.
HTH
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Racer
Joined: Jun 2012
Posts: 459
Likes: 1
From: LAUREL MD
Ls6 intake
First off, let me thank LoneStarFRC for his reply to my post regarding the oil pressure sending unit relocate.
Secondly, regarding the two tube approach to the intake swap, I have read that (and it seems to make sense) just plugging the rear holes or hose in the rear of the intake may cause heating problems with the #7 cylinder. The two tube approach supposedly allows cooling to that cylinder. The rear tube is joined to the front tube with a tee and a length of hose and allows circulation of coolant to the area of cylinder #7.
Secondly, regarding the two tube approach to the intake swap, I have read that (and it seems to make sense) just plugging the rear holes or hose in the rear of the intake may cause heating problems with the #7 cylinder. The two tube approach supposedly allows cooling to that cylinder. The rear tube is joined to the front tube with a tee and a length of hose and allows circulation of coolant to the area of cylinder #7.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Here's a pic of one. They are widely available and prices vary all over the place.
Some people prefer to modify the underside of their new Z06 manifold a bit and keep the one-piece coolant crossover tube they already have.
HTH
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Secondly, regarding the two tube approach to the intake swap, I have read that (and it seems to make sense) just plugging the rear holes or hose in the rear of the intake may cause heating problems with the #7 cylinder. The two tube approach supposedly allows cooling to that cylinder. The rear tube is joined to the front tube with a tee and a length of hose and allows circulation of coolant to the area of cylinder #7.
1. Use the OE one-piece LS1 tube assy and modify the intake
2. Use a Z06 front piece and use a separate modified piece in the rear made from the rear section of a LS1 line and route a rubber line to the front and tee into the front hose.
3. Use small rear (Z06 style) plugs that are modified and have 1/8" NPT threads that allows hose(s) to be run to the front. Wegner sells them.
See:
http://s41657.storefront-solutions.com/
and search part # WA0214
Check Nook and Tranny too. They may have something on this as well.
Heel & Toe
Joined: Aug 2018
Posts: 20
Likes: 6
From: Lakeland Florida
Oil sensor relocate, intake swap
I don't want to hijack this thread but i also am doing the swap. Thanx to the op for starting this thread and all contributors. My question is that i've heard a lot of bad stories about the oil pressure sensors going bad in c5's and the pita it is to change. So, does it make good sense to do a sensor relocate while the intake is off? If so, where can i get a kit. Again, thanx to the op.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,668
I have a 2000 C5. I bought an LS6 intake for it very early in its life. I just bolted the intake to the heads with the stock 4 point steam pipe system under it, and I never had any issues. With this intake, a 160° Stat, Flowmaster mufflers, a Blackwing air filter, stock exhaust manifolds with no cats and a tune, I ran a best time of 12.89@109.97mph. It is an A4 car.
Acct Suspended APR 2026 by request
Joined: Dec 2010
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Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
it looks identical to the ls1 intake, not much to see unless they have done some dressing up in the engine bay
Instructor
Joined: Sep 2017
Posts: 207
Likes: 53
Does the ls6 intake take a larger TB .
And is wiring/hookup of TB different
Sorry for all the noob questions
Wonder what the gain side would be . I already have long tubes and some head work .And would I be better off just getting the intake and get a BBK TB .
Last edited by IronMaidens2.0; Jul 17, 2021 at 12:51 PM.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
the runners are designed different internally, on the outside it is virtually the same as an ls1 and all the sensors are the same... the easiest way to tell is to look at the bottom, the ls6 intake is flat and the ls1 is concaved... the part number will also tell you but I don't know those off the top of my head, you can search around and easily find those... if you get an ls6 from an f-body that had egr you will have to block that port off but that's no big deal, if it came from a vette none of those had egr so you're fine... ls6 takes the same tb and there is really no reason to change it imo... plenty of guys have made ~1khp with forced induction on the factory tb and intake, if you are staying n/a then it wouldn't be much benefit unless you are building a max effort motor and use a larger intake such as a fast or msd which will require you to use an aftermarket tb anyway... the ls6 will help a tad bit but is not a huge gain (roughly 10hp or so on the top end) so don't expect it to blow you away