Decent Hp?
06-07-2005, 04:11 PM
#1
Member
Thread Starter
Join Date: Feb 2005
Posts: 48
Well my cars broken in good so I decided too dyno it and see how much power its making. Now im not sure if I should be happy, disapointed or just in between.
Mods:
-Rebuilt s4 6 port motor
-large street port
-removed air pump
-removed 5th/6th port actuators
-hks intake
-pacesetter headers
-custom single exhaust 2 1/2 inch pipe
-walbro fuel pump
I only got one run as it was kinda a favor because they didnt have alot of time but I have 150.6hp to the wheels and torque is messed up for some reason.
Let me know how that sounds.
Mods:
-Rebuilt s4 6 port motor
-large street port
-removed air pump
-removed 5th/6th port actuators
-hks intake
-pacesetter headers
-custom single exhaust 2 1/2 inch pipe
-walbro fuel pump
I only got one run as it was kinda a favor because they didnt have alot of time but I have 150.6hp to the wheels and torque is messed up for some reason.
Let me know how that sounds.
06-07-2005, 06:30 PM
#2
Super Moderator
Join Date: Sep 2002
Location: Savannah, Ga
Posts: 2,763
The walbro is hurting power. N/a's run too rich to begin with, and walbro's only make it worse by overwhelming the stock FPR and raising the fuel pressure.
You hp number is low, most likely due to the above reason. Put the stock pump back on.
You hp number is low, most likely due to the above reason. Put the stock pump back on.
06-07-2005, 09:17 PM
#3
Senior Member
Join Date: May 2005
Posts: 959
Yea...could be fuel related; a streetport really doesn't need all that much fuel over the stock port..at least on an NA.. get a wideband, check the AFR, or go back to the dyno and see if they can give you an AFR readout..that way you'll see what your running and can adjust for it by putting the stock pump back on..or maybe an S-AFC if you plan to throw NOS or FI at it...
06-08-2005, 07:39 AM
#5
Senior Member
Join Date: Aug 2003
Location: Tavistock Ontario Canada
Posts: 128
A friend of mine pulled 174 rwhp on a street port S4.
Aux ports where converted to an S5 style actuation.
S5 VDI manifold
Apexi SAFC2
Header + high flow exhaust
K&N
He believes there is still more to be had by better SAFC tuning yet.
Aux ports where converted to an S5 style actuation.
S5 VDI manifold
Apexi SAFC2
Header + high flow exhaust
K&N
He believes there is still more to be had by better SAFC tuning yet.
06-08-2005, 09:20 AM
#6
Super Moderator
Join Date: Sep 2002
Location: Savannah, Ga
Posts: 2,763
Kahren did 165 wheel hp on stock ports with the stock ecu/intake manifold on a S5. Haltech and custom intake manifold put him at 180 wheel hp on the same engine. On another car he made 195 wheel hp from a streetported S5 engine in a S4 with the stock ecu and S-afc.
06-08-2005, 11:05 AM
#8
Senior Member
Join Date: Oct 2003
Posts: 352
I've made 166 on a stock port/stock electronics engine. Fuel and timing tuning only. As has been said these engines run grossly rich with a completely stock setup. We ended up dialing fuel pressure back to around 25psi (end of regualtors adjustment) to bring A/F ratios into the 12.5:1 range. We've worked on some stuff to pull more fuel out and will dyno again. Expect power to fall somewhere north of 170whp with correct fuel tuning. Our exhaust is also not quite optimized. Hopefully there is another 5hp there but I won't hold my breath.
FWIW an SCCA ITS engine (the engine I'm referring to) is box stock from the AFM to the exhaust ports. The six-port sleeves are commonly removed as are ours. Speedsource claims 175whp from there package on stock electronics. And that number is well varified by many racers. With their Motec package they claim 185whp.
We found added timing to be a major source of HP. We started at stock and gradually bumped timing up until we found best power from 25* BTDC under full load at 7000rpm. We gained about 10hp for every 5* we advanced the timing until we hit 25* BTDC at which point the power didn't rise anymore.
Taking the above numbers into account a IMO a well built and tuned street ported motor should be capable of 200+whp.
FWIW an SCCA ITS engine (the engine I'm referring to) is box stock from the AFM to the exhaust ports. The six-port sleeves are commonly removed as are ours. Speedsource claims 175whp from there package on stock electronics. And that number is well varified by many racers. With their Motec package they claim 185whp.
We found added timing to be a major source of HP. We started at stock and gradually bumped timing up until we found best power from 25* BTDC under full load at 7000rpm. We gained about 10hp for every 5* we advanced the timing until we hit 25* BTDC at which point the power didn't rise anymore.
Taking the above numbers into account a IMO a well built and tuned street ported motor should be capable of 200+whp.
