Q45 dyno run

[carfrk666]

well last thursday we got bored here at school so we decided to dyno the Q45, she wouldnt dyno in 3rd gear like its soposed to because she kept downshiftin and we didnt want to start a run at those high speeds needed for 3rd gear, but non the less she ran 221hp and 218 ft/lb torque, not bad for this old girl, maybe later if i can find a way to lock into 3rd we will do another pull, but she pulled pretty god non the less

[Q45tech]

Based on the typical 0.787 correction factor these HP numbers are common and have been for the past 18 years. Torque should come out 225-235 depending on tire brand and temperature frictional losses. How much strap down pressure is applied to rear?

Buy a Nico ecu reprogram and see at least +20 HP and 25 lb/ft gain.

[qsiguy]

To keep it in 3rd gear all you need to do is unplug the TCU. It will stay in 3rd gear regardless of which forward gear you put it in.

Those numbers are about the same as mine pre turbo. Haven't done a dyno yet since installing the turbo.

[carfrk666]

ill try that tcu thing, just unplug the main wire harness off the unit?

QSIguy, what are you hopeing for numbers with the turbo?

[Q45tech]

Each 1.0 psi of boost increases air density by 6.8% LESS [1% of new peak for each 11F increase in plenum temperature less the increase in backpressure at exhaust valve caused by turbine.

6 psi probably nets 5.5% [without intercooler] so 33% gross and or about 25% net rear wheel. I would guess 300-320 RWHP is possible [based on 240 HP tuned stock with 370cc injectors].

[qsiguy]

Not sure. I'm tuning at 8-9 PSI of boost, intercooled now. It's a bad time of the year for me to dyno because it's so hot here.

I'm pretty confident I'll be over 400 rwhp. If I'm only at 300-320 after all this work someone may be able to pick up a turbo Q pretty cheap...

[elwesso]

Yeah run again with the TCU unplugged

Those numbers dont seem too bad though

[Q45tech]

Is 8-9 psi the plenum pressure or turbo out and what is plenum air temp at various time increments and rpm as intercooler changes?

Air temp is critical on pump gasoline with such high CR.

[SUB ZERO CAR FANATIC]

Each 1.0 psi of boost increases air density by 6.8% LESS [1% of new peak for each 11F increase in plenum temperature less the increase in backpressure at exhaust valve caused by turbine.

6 psi probably nets 5.5% [without intercooler] so 33% gross and or about 25% net rear wheel. I would guess 300-320 RWHP is possible [based on 240 HP tuned stock with 370cc injectors].

i thought the Q was rated conservatively at 278 rwhp andactually put out around 300.Was that incorrect info?? thanks Q45TECH SUBZERO

[carfrk666]

278 rated HP at the crank, 305 actual at the crank, that power gets put through a transmission, rear end and looses about 15-30% power due to friction

[Q45tech]

When ever you use the term HP you must specify an rpm [@ rpm] to allow engineers to convert to torque.

it was determined that the 90 Q engine produced ~~ 270-286 HP.....[the usual +- 3% variation in production].........the peak torque was UNDERRATED instead of 292 lb/ft many engine produced 300-305 lb/ft* at 4,000-4,500 rpm. * Most were on the + side 292 +3% to +4.5%Much depends on plenum air temperature since the plenum and runners are very sensitive to tuning changes as the air heats up.

They tried to broaden the reflected pulse with miniscule different port diameter and shapes in 2 input head ports.

Anyway you must specify plenum air temperature for anything to be meaningful. To be in tune 60-80F is required.

http://www.sengpielaudio.com/c...e.htm

[elwesso]

Which of course explains why HP sells cars, TORQUE wins races!