Harrop TVS86 Owners Thread

[johan]

Originally Posted by CSG Mike

10.6:1, K20.

In the specific example I'm thinking.

The obvious advantage there being simply the high rpm power of a K20. VTEC is quite a thing.

[CSG Mike]

Originally Posted by johan

The obvious advantage there being simply the high rpm power of a K20. VTEC is quite a thing.

RPM doesn't matter; ultimate air moved is still determined by the supercharger.

This is FI we're talking about, not NA.

[Irace86.2.0]

Originally Posted by CSG Mike

RPM doesn't matter; ultimate air moved is still determined by the supercharger.

This is FI we're talking about, not NA.

VTEC also adds valve lift besides valve timing. Maybe thats what he meant when he said a high reving vtec

[86 South Africa]

Anyone one here use their,own freight forwarding company to get a harrow kit?
I'm looking for quotes.... some shipping quotes I've had are over $1000!!!

[johan]

Originally Posted by CSG Mike

RPM doesn't matter; ultimate air moved is still determined by the supercharger.

This is FI we're talking about, not NA.

Of course it matters. HP is a byproduct of torque at RPM. As VTEC motors can keep their torque from falling off at high RPM due to the additional lift/potential flow provided, they will generally have more HP than another motor of the same displacement.

[CSG Mike]

Originally Posted by johan

Of course it matters. HP is a byproduct of torque at RPM. As VTEC motors can keep their torque from falling off at high RPM due to the additional lift/potential flow provided, they will generally have more HP than another motor of the same displacement.

VTEC allows for more flow, but the determining factor here is the mass of air moved through the supercharger.

This is precisely the principal upon which a restrictor works.

Whether you have a 2L engine, or a 4L engine, if you have a restriction at the intake...

[The Racers Line]

Originally Posted by 86 South Africa

Anyone one here use their,own freight forwarding company to get a harrow kit?
I'm looking for quotes.... some shipping quotes I've had are over $1000!!!

Have you talked to Harrop directly? Its about $350 to get one here to the states.

[86 South Africa]

Originally Posted by The Racers Line

Have you talked to Harrop directly? Its about $350 to get one here to the states.

Thanks for the note - just got a response from them at approx $495 (US)
Reckon that's about the best I'd get?

[ajc209]

Originally Posted by CSG Mike

VTEC allows for more flow, but the determining factor here is the mass of air moved through the supercharger.

This is precisely the principal upon which a restrictor works.

Whether you have a 2L engine, or a 4L engine, if you have a restriction at the intake...

The TVS chargers are limited to a pressure ratio of 2.4 (that 1.4Bar boost) and they have a 20k rpms limit.

On the FA20 with a pressure ration of 2.2 and e85 Harrop could not squeeze any more power (more boost = less efficiency due to moving into a very inefficient region of operation for the SC).

On the K20 with a higher rpm ceiling for the same SC rpm at peak revs (and thus same airflow) it runs less boost due to lower restriction in the head. Therefore you can spin it faster whilst staying within spec and get more power.

The TVS1320 hits max boost way before it hits max rpms on the FA20. Stock harrop runs about 8k rpms, not even half but you ant run it at 20k as the pressure ratio will be way out of spec.

[CSG Mike]

Originally Posted by ajc209

The TVS chargers are limited to a pressure ratio of 2.4 (that 1.4Bar boost) and they have a 20k rpms limit.

On the FA20 with a pressure ration of 2.2 and e85 Harrop could not squeeze any more power (more boost = less efficiency due to moving into a very inefficient region of operation for the SC).

On the K20 with a higher rpm ceiling for the same SC rpm at peak revs (and thus same airflow) it runs less boost due to lower restriction in the head. Therefore you can spin it faster whilst staying within spec and get more power.

The TVS1320 hits max boost way before it hits max rpms on the FA20. Stock harrop runs about 8k rpms, not even half but you ant run it at 20k as the pressure ratio will be way out of spec.

The assumption here, due to the torque involved, is built engine vs built engine, at which point, the FA20 can be built to flow substantially better than stock.

Likewise, a stock K20 would never be able to even do 1 pull at this power level.

[Dipstik-sportech]

Well I have a built engine and could run 1.4bar of boost easily.

Sent from my S60 using Tapatalk

[ajc209]

Originally Posted by Dipstik-sportech

Well I have a built engine and could run 1.4bar of boost easily.

Sent from my S60 using Tapatalk

My point was at 1.4bar you wont make as much power as you would with a k20 unless you improve the restriction (bigger valves more lift like element tuning did).

Sent from my SM-G935F using Tapatalk

[armstrom]

Does anyone know what the scaling is for the IAT sensor Harrop uses in the kit? I can't seem to find any information on it. I'll be dropping Harrop an email tonight but they might be slow to respond.
Thanks!
-Matt

[CSG Mike]

Originally Posted by armstrom

Does anyone know what the scaling is for the IAT sensor Harrop uses in the kit? I can't seem to find any information on it. I'll be dropping Harrop an email tonight but they might be slow to respond.
Thanks!
-Matt

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