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HARROP TVS, What You Need To Know & FAQ

Old 08-09-2009, 03:20 PM
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Hey wicked. Just a thought for you to maybe change in the first post.

As far as the exhaust goes, I would suggest having at least a full 2.5" catback with a 3" dp. Reason being is because your EGT's can climb really high really fast. And if you're one to hot lap your car at the track, your motor could go boom due to high EGT's. Other than that, I don't have anything to add to it.

Good post btw. TVS ftw!
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Old 08-09-2009, 03:42 PM
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While that is something to consider, as long as it's not stock you will be safe(r) to drive assertively
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Old 08-09-2009, 05:26 PM
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Originally Posted by TVS Cobalt View Post
Very properly put sir My car on the 3.1" was only making 18psi at 6800........ Boost in my opinion is insignificant as there are too many different factors for each set-up to make a generalized statement like the original post
falling VE in short.

people on here like big numbers.
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Old 08-09-2009, 05:32 PM
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Originally Posted by Area47 View Post
falling VE in short.

people on here like big numbers.
So I've noticed. You would think that they would try getting down the 1320' a little faster, or get that powerband nice and fat and take it auto-x'ing
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Old 08-09-2009, 06:38 PM
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Originally Posted by TxLonghorn#1 View Post
Is a 2.5inch full exhaust suitable? Also, with my mods, what should it get to allow me to run the TVS safely?

Mods:
Ijen CAI
AeroForce Intercepter Scan (dual) gauges (cobalt ss edition)
DC Strut Bar
Clutch Masters Stage 3 w/ Flywheel
Motor mounts
Corsa Touring Exhaust
JEX spark plugs
JBP Polyurethane Control Arm Bushings
LSJ Polyurethane Transaxle Mounts
Progress Rear Sway Bar
Innovative LC-1 Wideband Controller (DB-Blue Gauge)
Nokya Headlights & Foglights
GM Stage 2 w/stage 3 pulley & stage 3 pcm
Vibrant Long-Tube Headers w/dp
Quick Time Cut Out

Can anyone help me out? I just order 60# injectors.
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Old 08-10-2009, 02:39 AM
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^You would definately need some cooling mods if you want to run the tvs. At least a heat exchanger and dual pass endplate. I would recommend meth as well.
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Old 08-10-2009, 01:36 PM
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Originally Posted by InfraRedline View Post
^You would definately need some cooling mods if you want to run the tvs. At least a heat exchanger and dual pass endplate. I would recommend meth as well.
no. you don't.
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Old 08-10-2009, 01:38 PM
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Originally Posted by TxLonghorn#1 View Post
Can anyone help me out? I just order 60# injectors.
You need to loose the stage 3 pcm, a h/e or dual pass is a nice start. Do you need them... its up to the end user really.
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Old 08-10-2009, 02:32 PM
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Just some info for people. Tuned my car yesterday...mods r in my sig...tune info is the following

AFR = 11.9
Timing = 25*
KR = 0 (didnt even see any at all during the tune process)
IAT2 = 149* after 4 pulls on the highway in 27*C weather
Boost = 20psi
1st gear = idle - 4000rpm reduced to 75% boost, 4000-5000rpm starts to climb, by 5000rpm it makes 100% boost. All other gears are 100%
Trim = 0.8%

Car pulls like a **** :P
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Old 08-11-2009, 10:00 PM
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If anyone ever wants to buy a tvs just let us know. We are Harrop's only warehouse direct vendor.
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Old 08-11-2009, 10:21 PM
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What about fuel system. Would I need to do a return line, or just upgrade to 79lb'ers to run a 2.75" on my 2.2. Would my current 60lbers be enough fuel?
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Old 08-12-2009, 08:58 AM
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Originally Posted by Sw4y1313 View Post
Would my current 60lbers be enough fuel?
I say yes with meth injection. Others will disagree.
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Old 08-12-2009, 10:03 AM
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Originally Posted by Snakes709 View Post
Just some info for people. Tuned my car yesterday...mods r in my sig...tune info is the following

AFR = 11.9
Timing = 25*
KR = 0 (didnt even see any at all during the tune process)
IAT2 = 149* after 4 pulls on the highway in 27*C weather
Boost = 20psi
1st gear = idle - 4000rpm reduced to 75% boost, 4000-5000rpm starts to climb, by 5000rpm it makes 100% boost. All other gears are 100%
Trim = 0.8%

Car pulls like a **** :P
out of curiosity, what size pulley are you running?
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Old 08-12-2009, 10:08 AM
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Originally Posted by JimHarr18 View Post
out of curiosity, what size pulley are you running?
That boost level he's on the factory 80mm pulley. ~3.1 or equal to the factory pulley on the M62.

I've got the same set-up. My tune is a little different. 11.6-11.8 AFR, 22* of timing and 50/50 meth mix for the moment. Going to bump up timing this weekend and up my meth content.
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Old 08-12-2009, 01:05 PM
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Originally Posted by Sw4y1313 View Post
What about fuel system. Would I need to do a return line, or just upgrade to 79lb'ers to run a 2.75" on my 2.2. Would my current 60lbers be enough fuel?
60's are not enough of a safe window to do it.

sure it's fine in the summer. winter rolls around. nope.
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Old 08-12-2009, 03:51 PM
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Originally Posted by Area47 View Post
60's are not enough of a safe window to do it.

sure it's fine in the summer. winter rolls around. nope.
Curious, why does weather (hot or cold ambient temps) make a difference?

Is it the colder the temps the 'richer' your tune should be and when it's hot the 'leaner' your tune can be? I really have no idea, just taking a blind stab at it.
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Old 08-12-2009, 04:14 PM
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Cold air is more dense. A pulley smaller than 80mm would out work the 60's trying to meet fuel needs for winter temp air
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Old 08-12-2009, 04:28 PM
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Alright, so 79lb'ers it is. I don't want to go with anything larger then a 2.9 but 2.75 is my goal. How has our stock fuel pumps held up to the 79lb injectors? I know a few are running them but cant remember if they had an additional inline or aftermarket in-tank.
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Old 08-12-2009, 04:31 PM
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Not that I am aware of. Some may have, but most I know are on stock fuel system running 79's
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Old 08-12-2009, 04:35 PM
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Originally Posted by WickedSS2005 View Post
Not that I am aware of. Some may have, but most I know are on stock fuel system running 79's
Excellent, I like your quick responses Wicked. Thanks for the info. Good thing you got going here in these TVS threads

And thanks Area, exactly the info I needed as well.

Now I just gotta make it through 21 weeks of OSUT and I'll have the TVS
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Old 08-14-2009, 02:31 PM
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Originally Posted by lsjwannabe View Post
You need to loose the stage 3 pcm, a h/e or dual pass is a nice start. Do you need them... its up to the end user really.
I don't have it installed right now, I was just curious.


Originally Posted by fast98 View Post
If anyone ever wants to buy a tvs just let us know. We are Harrop's only warehouse direct vendor.
I will be purchasing one in the next week. I JUST bought 60# injectors from you, because I thought that's what I read, but as I was reading this thread, I'll need 79#s. I have a dual pass ready to get installed. I'm also going to purchase a h/e and meth for sure. But can
I ran the Vibrant long tubes with the TVS?? It's a 2.5, so is that ok?
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Old 08-14-2009, 07:52 PM
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So with a 2.5" pulley and 8K redline wont be a problem for the TVS to handle? This is of course on a motor build to handle horsepower oviously not on a stock motor. I'd like to build big horsepower on a supercharger rather than a turbo just because I think it be unique and different. Is it possible to see 30 PSI on a TVS is what I'm asking more or less?

Also what mods would I need to do to my car to directly bolt on a TVS right now running the stock TVS pulley which from what i read is a 3.1" pulley. My guess is bigger fuel injectors, the LS4 TB and 3" intake, my exhaust system is completely opened up so I know I'm ok there and tuning inst a problem. Is a H/E a must, should I get one before I even buy the TVS?
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Old 08-15-2009, 02:02 PM
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Old 08-15-2009, 02:11 PM
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Originally Posted by CobaltSS313 View Post
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So with a 2.5" pulley and 8K redline wont be a problem for the TVS to handle? This is of course on a motor build to handle horsepower oviously not on a stock motor. I'd like to build big horsepower on a supercharger rather than a turbo just because I think it be unique and different. Is it possible to see 30 PSI on a TVS is what I'm asking more or less?

Also what mods would I need to do to my car to directly bolt on a TVS right now running the stock TVS pulley which from what i read is a 3.1" pulley. My guess is bigger fuel injectors, the LS4 TB and 3" intake, my exhaust system is completely opened up so I know I'm ok there and tuning inst a problem. Is a H/E a must, should I get one before I even buy the TVS?


First thing.

You don't want the 2.5" pulley.

I ran it just fine on stock motor 28 psi at 7400 rpms.

The 2.75" is the smallest size that will allow you to run optimal timing.

Right now you could strap the tv on to your car and drive just fine. A 3" intake is not necessary but is nice to have becuase is slows down your maf freq.

If you wanna chat i can pm you my phone number.
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Old 08-15-2009, 02:17 PM
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Also, the point of this thread to to answer your questions Cobaltss313. BUT, everything you asked was in my first post... It lists the bare bones minimum, the basics, and the extras..
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