Adiquate result from my "slightly adjusted" Griffi
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Adiquate result from my "slightly adjusted" Griffi
The engine in question is a 5 litre Rover v8, with a few things bolted on to it...
Not too bad a result. I'm a bit surprised by the antics at 4000 RPM. The only thing that's different beween this and the 260 bhp result in the summer is my own design of isolated runner twin plenum inlet manifold.
Not too bad a result. I'm a bit surprised by the antics at 4000 RPM. The only thing that's different beween this and the 260 bhp result in the summer is my own design of isolated runner twin plenum inlet manifold.
nice one mate,
glad to see things going the right direction,
glad to see things going the right direction,
Regards Tony C (COOPS)
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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Certainly very odd. Above that point the torque curve does exactly what I would expect, below there it is all over the place. Usually results like that are from excessive wheelspin on the rollers. If that isn't the case, then there is something very wrong with airflow in the intake or some wierdy in the exhaust.
With IR setups the torque plot usually has a small hump low down for the airbox (if there is one) then 1 or 2 distinct humps for resonant modes.
Intriguing...
With IR setups the torque plot usually has a small hump low down for the airbox (if there is one) then 1 or 2 distinct humps for resonant modes.
Intriguing...
Its daves own design manifold:bill shurvinton wrote:Certainly very odd. Above that point the torque curve does exactly what I would expect, below there it is all over the place. Usually results like that are from excessive wheelspin on the rollers. If that isn't the case, then there is something very wrong with airflow in the intake or some wierdy in the exhaust.
With IR setups the torque plot usually has a small hump low down for the airbox (if there is one) then 1 or 2 distinct humps for resonant modes.
Intriguing...
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- Getting There
- Posts: 188
- Joined: Sat Nov 18, 2006 4:45 pm
I think I have the answer to the jump in torque issue.
There is a term: "Effective wide open throttle". In a NA engine, it means the throttle angle to achieve atmospheric pressure in the manifold. Any throttle opening after this is simply slowing the airflow down.
Effective WOT with these plenums at low RPM is around 30% or so, and the RR test was done with the throttle pegged at 100%. It would be interesting to see results from using a progressive throttle opening in this lower RPM area.
There is a term: "Effective wide open throttle". In a NA engine, it means the throttle angle to achieve atmospheric pressure in the manifold. Any throttle opening after this is simply slowing the airflow down.
Effective WOT with these plenums at low RPM is around 30% or so, and the RR test was done with the throttle pegged at 100%. It would be interesting to see results from using a progressive throttle opening in this lower RPM area.