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HARROP TVS, What You Need To Know & FAQ

Old 06-01-2011, 08:10 PM
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Hey guys I had a quick question. Who would you guys recommend as far as tuning the tvs. Im in PA and wanna go to someone who really knows what they're doing and possibly have them install it for me? I wouldn't mind doing it myself but I feel too uncomfortable driving it a long distance to a good tuner. Does BYT know what they are doing as far as the tvs goes?
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Old 06-02-2011, 02:19 AM
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I would get ahold of BYT
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Old 06-03-2011, 05:30 AM
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Originally Posted by InfraRedline View Post
Well thats more acceptable for those boost levels. I saw 19psi on the 2.9 with 3" intake, vibrant header, 2.5" dp and 3" catback. Now I have a 3" dp going on
how much did your boost drop when you put on the 3in dp
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Old 06-05-2011, 11:47 PM
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Might be getting tvs here soon. Any good tuners in nc???
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Old 06-06-2011, 03:04 AM
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Originally Posted by freakta View Post
how much did your boost drop when you put on the 3in dp
I did it at the same time as my ported head, so im not sure. I still havent logged boost with this setup yet lol
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Old 06-11-2011, 12:12 AM
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bump just got mine
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Old 06-30-2011, 05:20 AM
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im stage 3 right now but want more power and tq this is my set up right now. what would i or could i make to the wheels with this setup and a TVS ?

3.1 pulley or 2.9 for the tvs not sure which one i should run.

current mods 2.9 pulley shorter belt 80lb injectors s3 heat exchanger dual pass end plate option b bkr7e spark plugs zzp mid length header zzp 3inch down pipe stock exhuast ( u grading to a full 3 inch exhuast) making 16psi on a zzp can tune.

what psi can i expect with a 3.1 pulley or 2.9 and a good spot on tune with all the above mods. i have when upgrading to a tvs ?
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Old 07-03-2011, 06:01 PM
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Looking into this for my LE5 2.4L Auto, the M62 is clearly limited by its design and they dont call it the Heaton for nothing.

I'm thinking: 3.4 or larger pulley, not looking for crazy boost. Between 10 and 12 PSI, with my 20% displacement advantage and full exhaust 3.4 should put me there.

I'll add Option B, Phenolic gasket, 78# springs and do a Port on the head and add some ARP studs to keep it all together and flowing fast.

Not many 2.4s with the TVS, but I think it can work great if boost is kept lower.

One thing, 5 rib belt on LE5s, do I just run it on the 6 rib pulley wherever it fits best? As in, leave a rib empty on the pulley?

Informed comments welcome, I'm thinking hard about this TVS.
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Old 07-03-2011, 08:23 PM
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Originally Posted by OttawaMark View Post
Looking into this for my LE5 2.4L Auto, the M62 is clearly limited by its design and they dont call it the Heaton for nothing.

I'm thinking: 3.4 or larger pulley, not looking for crazy boost. Between 10 and 12 PSI, with my 20% displacement advantage and full exhaust 3.4 should put me there.

I'll add Option B, Phenolic gasket, 78# springs and do a Port on the head and add some ARP studs to keep it all together and flowing fast.

Not many 2.4s with the TVS, but I think it can work great if boost is kept lower.

One thing, 5 rib belt on LE5s, do I just run it on the 6 rib pulley wherever it fits best? As in, leave a rib empty on the pulley?

Informed comments welcome, I'm thinking hard about this TVS.
the only issue you might run into with this based in the size if the supercharger and pulley is your front upper crossmember since your auto (correct?)

i know you probably already modified it to fit your m62 but you will probably have to modify it even further to allow for adequate space
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Old 08-15-2011, 12:28 AM
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Is porting and polishing worth anything on these?

Last edited by 87gn06gto07irl; 08-18-2011 at 01:20 AM.
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Old 08-15-2011, 02:08 AM
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the tvs is maxed factory so no porting can be done

as low as your tune lets you go... ive got a 2.5 on mine, a few others are running them as well. i think im the only guy running 60#s with it though, most people go up to 80#s
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Old 08-15-2011, 07:44 AM
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how is your car running with the 60#s with the tvs ?
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Old 08-16-2011, 10:24 AM
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Lots of methanol
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Old 08-17-2011, 11:52 AM
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Originally Posted by WickedSS2005 View Post
Lots of methanol
and then lots more...
4 1#hr injectors, one at each cyl in each port
pumped very high velcity

o ya and a brfpr for the fuel

bigger injectors psssshhh just run the ones i have more efficiently

id love to get some nitrous and run this setup


so i could be the only 4cyl running 12 injectors hahaha
but ill prob just pump it into my intercooler to keep temps even lower than they already are
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Old 08-17-2011, 12:06 PM
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Old 08-17-2011, 05:16 PM
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What is the max efficient blower rpm?
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Old 08-17-2011, 06:16 PM
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~12,000RPM?

so on the 80mm pulley would be ~5825 engine rpm

Last edited by RooTBeeR; 08-17-2011 at 06:22 PM.
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Old 08-18-2011, 01:29 PM
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Originally Posted by freakta View Post
and then lots more...
4 1#hr injectors, one at each cyl in each port
pumped very high velcity

o ya and a brfpr for the fuel

bigger injectors psssshhh just run the ones i have more efficiently

id love to get some nitrous and run this setup
so i could be the only 4cyl running 12 injectors hahaha
but ill prob just pump it into my intercooler to keep temps even lower than they already are
You sir, have got to have a long discussion with me. I'm outta the loop on so much this year because I've reterted back to the M62
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Old 08-18-2011, 01:53 PM
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Originally Posted by 87gn06gto07irl View Post
what is the max efficient blower rpm?
22,000

Originally Posted by harrop View Post
part of the durability testing we have done on all our htv range is "extended abuse" mode on our in-house and eaton-certified test cell.
We have run our generic htv1320 at 8,000rpm to 22,000rpm for 100 continuous hours, cycling the bleed valve (boost controller) from 5psi - 25psi every few minutes (its actually a lot more complicated than that).
We have not had any failures while durability testing.
Assuming we had a head that could flow the massive amounts of air it would produce at that speed, this is the pulley size you'd need, and the engine rpm youd have to spin to:

(22,000 * Supercharger Pulley) / Crankshaft Pulley @ 6.25 = Engine RPM)

2.3 @ 8,096 = 22,000 rpm
2.4 @ 8,448 = 22,000 rpm
2.5 @ 8,800 = 22,000 rpm
2.6 @ 9,152 = 22,000 rpm
2.7 @ 9,504 = 22,000 rpm
2.75 @ 9,680 = 22,000 rpm
2.8 @ 9,856 = 22,000 rpm
2.85 @ 10,032 = 22,000 rpm
2.99 @ 10,525 = 22,000 rpm
3.06 @ 10,771 = 22,000 rpm
3.10 @ 10,912 = 22,000 rpm
3.15 @ 11,087 = 22,000 rpm
3.30 @ 11,616 = 22,000 rpm
3.34 @ 11,757 = 22,000 rpm

Edit: Oh you said most efficient, I understood "max rpm". Ah well. lol

While I'm here, figure I'll share this:



This is the TVS performance map converted from Volume to the more familiar Mass using an assumed air density of 0.076 ft^3/lb.

The conversion I used was:

Volume m^3/hr * 0.5885 = Volume ft^3/min

Volume ft^3/min * Air Density ft^3/lb = Mass lb/min

Last edited by Pyros777; 08-18-2011 at 02:52 PM.
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Old 08-21-2011, 12:48 AM
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so what is the rpm range tat the supercharger is most efficient fromi.e. 7k -15k K just numbers.


it wuld be a fun experiment to play with pulley size based on engine rpm to figure driving input, and see what the tvs would be most efficient driving at... or maybe it spast my bed time
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Old 08-22-2011, 01:36 PM
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Best bet is to pop the car on a dyno and bust out a custom PID to log supercharger speed.

Also, if you trust the conversion to MAF from above, you could do MAF vs pressure ratio (PSI+14.7/14.7) on that chart using data from your log. From there you could compare it to your dyno chart, and you'd be able to see all kinds of data at least regarding what parts of that performance map our cars operate in when theyre making power.

I've done this to a certain extent with the M62 with a dyno log, but I'm not totally convinced its accurate. It is a nice illustration though.

Note: I filtered the log to only show WOT.



Looks like I made ~220whp & ft-lb at 5252rpm, 14.06psi aka 1.97:1 Pressure Ratio, and 10978 s/c rpm. Thats right about 59% efficiency according to the M62 map.

If I had had a better flowing exhaust at the time, I might have made the same power at a lower boost level, thus moving the point inward to one of the more efficient bands on the map.

Last edited by Pyros777; 08-22-2011 at 02:35 PM.
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Old 08-22-2011, 01:49 PM
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Wow! This is over my head for sure. Seems like detailed info. Wish I knew wtf I was looking at.
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Old 08-22-2011, 02:08 PM
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Old 08-23-2011, 09:12 AM
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serious question, has anyone run a crazy small pulley on a tvs and set the boost limit at 20psi? curious if it can be made to put out a better trq and hp curve than a m62 across the board without generating motor destroying boost at upper rpms. also curious how effective the car is at limiting boost with the bypass valve and how it affects iat2s and such.
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Old 08-23-2011, 11:14 AM
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I didnt know you could set a boost limit on a SC. In addition, as long as you have a good tune and a couple supporting mods, you wont hurt your motor with it. I've got a 2.7 pulley on my TVS.
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