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HARROP TVS, What You Need To Know & FAQ

Old 08-08-2009, 08:33 PM
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Cool HARROP TVS, What You Need To Know & FAQ

Since the previous thread has gotten lost in the shuffle and ran into a bunch of useless posts, I am re-hosting this. Try to keep it cleaner this time.

**Please keep in mind the views expressed in this post are the personal experience of myself and basic info to get you started. Use the information at your own risk**

For a starters:

Required Bare Minimum: to get you mobile
60# Injectors
Tune

HIGHLY Recommended: Basically required for any decent numbers. Obviously, the 3" will yield better numbers
Intake
-or-
3" Intake
Header
2.5" or 3" dp
2.5" or 3" exhaust
Any combination of: Dual Pass (+/- Opt B), H/E, Meth

Optional Equipment
Smaller Pulley
Clutch
Solid Motor/Tranny Mounts
-or-
Rotated Tranny Mounts
Return-style Fuel System for smaller than the "stock" 80mm pulley
-or-
larger injectors (72#)
LS4 Throttle Body - if you can get used to the uber touchy throttle
Internals
Head port/polish
Upgraded Valvetrain

Vendors of the TVS/Harrop-lsj1320
OTTPerformance
Intense Racing
ZZP

WickedSS2005's Personal Experience
My initial setup was the bare minimum. My last dyno was 318/288 @ 7,395rpm w/ afr of 11.9 and 17* timing @ 69*F w/ 48% humidity; and was still on the way up. Stock air box mod, pacesetter header, 3" catless dp, 3" custom exhaust, secondary cobra h/e, no meth. IAT2's topped at 133*F after the third pull. My 2.6/60's setup hit 160+ IAT2's after multiple runs and dyno'd in at 258/239.

Questions
so just out of curiosity, would it help if you tried to port the TVS at all? and i noticed that is doesnt the silencer holes like the m62 yet it is still a quieter whine for some reason any one know?
The TVS is designed for maximum performance and a direct statement from HARROP itself states: "Porting the HTV1320 can and will decrease performance and void warranty. Through extensive testing it has been designed to be the most effective directly from the manufacturer"

What PSI can I expect from "x" pulley? *note, this is with 2.5" exhaust and stock header/dp. Take off 1-3psi depending on exhaust components
64mm / 2.5" ~ 27.5 psi
70mm / 2.75" ~ 25 psi
75mm / 2.95" ~ 22.5 psi
80mm / 3.15" ~ 20 psi
85mm / 3.35" ~ 17.5 psi
89mm / 3.5" ~15psi

Per Area47, note this is with a higher redline w/ upgrade valvetrain: as a slight correction to the psi reference.
if you spin the motor high enough a 3.1 pulley will make 23psi. a 2.9 will make 25, and a 2.75 will make 26.5. 99% of the tvs owners will not spin their engines to 7900 to see this. i personally have seen 27psi out of the 2.75 ring

i've already spent the 250 on my K&N .... will it fit up to the TVS... if not what needs to be done and/or who sells one that will fit??
Yes, the 2.75" intakes will work with the TVS. It's more of a matter of what Throttle Body you are running and use a coupler to make up the difference from the K&N to an LS4 throttle body.

OTTP has just released a full 3" intake designed for the utmost ease of use. No rubbing, clears the '07 brake lines, full stainless steel. ZZP and RAW also offer a 3" intake. Fujita F5 cai for the ss/sc is a 3" intake as well.

Personally, I tested on the stock air box mod

how hard is it to install any how tos or pics?
There's a how-to on here. It varies slightly from a how-to to swapping pullies on the M62. Only diff is you need to make a modification to the MAP sensor and angle it to fit beneath the housing of the TVS and adjust your oil dipstick. Piece of cake.

What numbers can I expect?
My final numbers were 318hp/282tq. My mods were as follows: airbox mod, stock tb, 60# injectors, stock endplate and manifold, cobra h/e in-series with stock h/e, 90% distilled water/10% coolant w/ bottle of water wetter in the f/i cooling system, stock head, stock internals, 1.75" primary pacesetter header, custom 3" catless dp, custom 3" exhaust, stock clutch, stock axles, TTR motor/trans mounts. Best 1/4 mile was [email protected] 60' was 2.4 seconds.

does anyone happen to know the rpm rate of the tvs as far as pulley's go and what's safe? the stock m62's safest small pulley was the 2.8, but you can get away with a 2.7. i was going to throw my current 2.75 on if i went with the tvs, which i was told by my tuner would be perfectly safe. i'm curious if i could go a little smaller and still be safe?
Good question. From my understanding, a 2.5" pulley is not going to harm the blower. I do not know the rpm limits off hand. Keep in mind, there is a difference in max sustained rpm, and max absolute rpm. I doubt anyone would ever sustain the tvs at 2.5" pulley running 8k engine rpm. you'd be asking for damage. The pulley for the M62 will not bolt up to the TVS

the TVS is the stet-up I'm looking at getting. My question is, will the stage 3 pcm be safe to run with the TVS?
No, a custom tune is needed.

im assuming you need the smaller belt if pulley down the TVS like the M62?
Yes you do. Stock belt is fine for the 80mm pulley but like the M62 will require a larger tensioner pulley or stage 2 belt.

Last edited by Staged07SS; 07-23-2013 at 11:42 AM.
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Old 08-08-2009, 08:36 PM
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You keep it cleaner, TOM! Im sorry for being usless
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Old 08-08-2009, 08:46 PM
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does anyone happen to know the rpm rate of the tvs as far as pulley's go and what's safe? the stock m62's safest small pulley was the 2.8, but you can get away with a 2.7. i was going to throw my current 2.75 on if i went with the tvs, which i was told by my tuner would be perfectly safe. i'm curious if i could go a little smaller and still be safe?
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Old 08-08-2009, 08:49 PM
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Originally Posted by JimHarr18 View Post
does anyone happen to know the rpm rate of the tvs as far as pulley's go and what's safe? the stock m62's safest small pulley was the 2.8, but you can get away with a 2.7. i was going to throw my current 2.75 on if i went with the tvs, which i was told by my tuner would be perfectly safe. i'm curious if i could go a little smaller and still be safe?
What kind of fueling do you plan on running? I am on the 2.9" and my IDC's are at 97-98% at 7350 RPM's
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Old 08-08-2009, 08:50 PM
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as a slight correction to the psi reference.
if you spin the motor high enough a 3.1 pulley will make 23psi. a 2.9 will make 25, and a 2.75 will make 26.5. 99% of the tvs owners will not spin their engines to 7900 to see this. i personally have seen 27psi out of the 2.75 ring
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Old 08-08-2009, 08:53 PM
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Originally Posted by Area47 View Post
as a slight correction to the psi reference.
if you spin the motor high enough a 3.1 pulley will make 23psi. a 2.9 will make 25, and a 2.75 will make 26.5. 99% of the tvs owners will not spin their engines to 7900 to see this. i personally have seen 27psi out of the 2.75 ring
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
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Old 08-08-2009, 08:58 PM
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i was most likely going to stick with the stock fuel rail rather than go with a return system. i currently have 60's in my car, but upgrading to 79's or 80's did cross my mind, but really only if i needed to. i do not know my idc's, but on the stock m62 i have a 2.75, redline is at 7k, and my tune is not aggressive at all.
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Old 08-08-2009, 08:59 PM
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mine was only making 18 also,so instead of spinning the crap out of it i just pulleyed down.
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Old 08-08-2009, 09:00 PM
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Originally Posted by JimHarr18 View Post
does anyone happen to know the rpm rate of the tvs as far as pulley's go and what's safe? the stock m62's safest small pulley was the 2.8, but you can get away with a 2.7. i was going to throw my current 2.75 on if i went with the tvs, which i was told by my tuner would be perfectly safe. i'm curious if i could go a little smaller and still be safe?
Good question. From my understanding, a 2.5" pulley is not going to harm the blower. I do not know the rpm limits off hand. Keep in mind, there is a difference in max sustained rpm, and max absolute rpm. I doubt anyone would ever sustain the tvs at 2.5" pulley running 8k engine rpm. you'd be asking for damage
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Old 08-08-2009, 09:05 PM
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yeah, i have no plans to raise my limiter, at least not too far over 7200. and as far as max blower rpm, while i won't say i never run the car to redline, i don't do it too often to the point where i could justify myself getting a SLIGHTLY smaller pulley. i wouldn't mind a 2.6 to be honest, but again, only if i'm not maxing out the blower before 6800 engine rpm.
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Old 08-08-2009, 09:06 PM
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Originally Posted by JimHarr18 View Post
i was most likely going to stick with the stock fuel rail rather than go with a return system. i currently have 60's in my car, but upgrading to 79's or 80's did cross my mind, but really only if i needed to. i do not know my idc's, but on the stock m62 i have a 2.75, redline is at 7k, and my tune is not aggressive at all.
You know the pulleys from the M62 and TVS are not interchangable correct? My reccomendation is to look alot deeper into what "you" want with the car before jumping to a TVS.. Also, do more research on fueling...

Originally Posted by scott allen View Post
mine was only making 18 also,so instead of spinning the crap out of it i just pulleyed down.
Well that has its' advantages and disadvantages.... Me personally a 2.9" with a nice P&P head and a built valvetrain revving to 7500-7700 would seem ideal pending further research
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Old 08-08-2009, 09:07 PM
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i shift around 7100 to 7200.
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Old 08-08-2009, 09:09 PM
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Originally Posted by scott allen View Post
i shift around 7100 to 7200.
From what I gather is sounds like you need a better tune then
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Old 08-08-2009, 09:09 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
This is why I had put the fromt he beginning: w/ 2.5" exhaust and stock header/dp

Well, added the stock header/dp for clarification just now, but it has always said w/ 2.5" exhaust
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Old 08-08-2009, 09:10 PM
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Originally Posted by TVS Cobalt View Post
From what I gather is sounds like you need a better tune then
thats just were i shift at i dont want to hurt the moter.
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Old 08-08-2009, 09:12 PM
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Originally Posted by scott allen View Post
thats just were i shift at i dont want to hurt the moter.
I was reffering to your earlier post in a sense.(IT was posed towards WickedSS2005)
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Old 08-08-2009, 09:18 PM
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i know whats up with that 290 aint much for my mods,it was on a mustang dyno but damn. that was on the stock pulley and no meth i just added all that.
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Old 08-08-2009, 09:34 PM
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the TVS is the stet-up I'm looking at getting. My question is, will the stage 3 pcm be safe to run with the TVS?
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Old 08-08-2009, 09:43 PM
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No. A custom tune is needed, the stage tune would only be a limp until you get to the performance shop for a real tune. And a very short limp too
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Old 08-08-2009, 09:49 PM
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Originally Posted by WickedSS2005 View Post
No. A custom tune is needed, the stage tune would only be a limp until you get to the performance shop for a real tune. And a very short limp too
The stage 3 pcm is locked........
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Old 08-08-2009, 09:52 PM
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Originally Posted by TVS Cobalt View Post
The stage 3 pcm is locked........
This I know. I was posting with the assumption that I was strictly answering the stage tunes are not useable. But you do get to keep your stock PCM when you go to stage 3, so tuning is still possible
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Old 08-08-2009, 10:28 PM
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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
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Old 08-09-2009, 01:07 PM
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def gonna do this
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Old 08-09-2009, 01:09 PM
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Harryresh, I'm only about 3 hours from you if you wanna do the Harrop set up. I know tuning and all for the Harrop.
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Old 08-09-2009, 04:16 PM
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i wonder what it would be like to run a 2.5" pulley on the tvs..lol. Of course having the mods to support it so the car doesnt blow up.
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