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Got Over 400kw Atw?

T04GTR

By T04GTR,
in Engines & Forced Induction

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colinhunt
colinhunt

Let's not turn yet another thread into a discussion about your car, please.

Lithium
Lithium
SiR_RB
SiR_RB

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Ryan1200 Proficient

Ryan1200

Posted
Posted

^^

Your big valves helping or hurting?

Are you using pods or an air box?

Apexi pods and hurting spool helping top end. Before the latest mods it's a pretty normal figure 400kw on 98 for a nicely built 26 with stock valves always thought something may have been holding it back considering the amount of head work iv had done.

"Clearly" shoot 4?? :)

Ryan1200 Proficient

Ryan1200

Posted
Posted

Iv been considering returning to stock airbox to till I noticed one of my plastic turbo to afm pipes completely chewed up by a hungry possum in the shed wasn't fn happy.. If I get time in the next few months I'll return it to stock and re test id prefer the stock look.

bigmikespec Veteran

bigmikespec

Posted
Posted

Unless you are opening the ports to 90% of the valve head ratio don't bother with bigger than +1.0mm exhaust valves. The bigger valve head can also hurt flow in a small bore. Moreso a problem on intake though.

black bnr32 Community Regular

black bnr32

Posted
Posted

Yep close about 4300 on pump but I think around 3800 on e85. I still believe my +2mm Exhuast valves effect spool a bit... Not only was it a smallish outlet on the manifolds but there could have been a nasty square edge in the mix aswell I really should've matched it up earlier but got lazy...

hot damn. your spool is comparatively very good, imo. what cams? dumps? boost control info? timing?

GASCO123 Rookie

GASCO123

Posted
Posted

How do you work that out exactly? :huh:

You - 175km/h @ 7000rpm (4th)

RPMGTR - 230km/h @ 8000rpm (4th)

You are doing 150km/h @ 6k, 175km/h @ 7k... So roughly 200km/h you are 8k

Meaning yours is the shorter ratio... So of course yours appears more responsive.

Ben's dyno using 5th, mines 4th gear.

Ben's getting 28.7 km/1000rpm. Std is 33.5 5th and 25.5 4th. Half way between.

Ben tends to use 5th gear as it give less gear box loss, 5th is 1:1 ratio.

Unusual he starts the dyno at 3000 rpm

jangles Veteran

jangles

Posted
Posted

Ben's dyno using 5th, mines 4th gear.

Ben's getting 28.7 km/1000rpm. Std is 33.5 5th and 25.5 4th. Half way between.

Ben tends to use 5th gear as it give less gear box loss, 5th is 1:1 ratio.

Unusual he starts the dyno at 3000 rpm

isnt the idea to run the dyno in 1:1?

GTR_JOEY Grand Master

GTR_JOEY

Posted
Posted

Depending which gear you run it will give u a higher/lower torque readout...

Hp should still be the same yea?

Though I guess depending what gear the car is in it will effect how much load is on the engine causing the curve to move left/right relative to load

rob82 Mentor

rob82

Posted
Posted

Depending which gear you run it will give u a higher/lower torque readout...

Hp should still be the same yea?

Though I guess depending what gear the car is in it will effect how much load is on the engine causing the curve to move left/right relative to load

No gear ratio will only change the tractive effort or the actual load through the load cell. In a perfect world the gear ratio shouldn't make a difference in measured hp or only be slightly different due to the differing thrust loading through the gearbox.

In reality even the good dynos show a slight difference between say 3rd and 4th gear probly due to unaccounted for acceleration rates.

The ramp rate is really the only thing that should influence how a turbocharged cars power delivery is plotted. Slower ramp rate gives the turbocharger longer to spool hence moving the graph to the left.

GASCO123 Rookie

GASCO123

Posted
Posted

No gear ratio will only change the tractive effort or the actual load through the load cell. In a perfect world the gear ratio shouldn't make a difference in measured hp or only be slightly different due to the differing thrust loading through the gearbox.

In reality even the good dynos show a slight difference between say 3rd and 4th gear probly due to unaccounted for acceleration rates.

The ramp rate is really the only thing that should influence how a turbocharged cars power delivery is plotted. Slower ramp rate gives the turbocharger longer to spool hence moving the graph to the left.

In my opinion, exactly.

Dyno's are set up to give a fixed road speed increase with time, e.g. 12 kph/sec.

If you use a taller gear the dyno stills holds the wheel speed to 12 kph/sec, giving the dyno sweep longer time from start to red line.

This then gives the turbo's more time to spool. Should give a quicker spool up , not by time but by road speed, which is what the reads.

I prefer dyno runs in rpm not road speed. This shows what the motor is doing more acurately than the unknown gearing of the car.

People on this thread do not even knowin what gear Ben's run was done.To me it seems 5th with a 4.1:1 diff. Only way to get 230 kph at 8000rpm.

He does use 4th sometimes,and 5th soetimes. He tuned my R32 GTR many years ago, great job too.

ezy_09s Proficient

ezy_09s

Posted
Posted

Ben's dyno using 5th, mines 4th gear.

Ben's getting 28.7 km/1000rpm. Std is 33.5 5th and 25.5 4th. Half way between.

Ben tends to use 5th gear as it give less gear box loss, 5th is 1:1 ratio.

Unusual he starts the dyno at 3000 rpm

Since when is 5th gear 1:1 ratio ?

4th is 1:1 , 5th is 0.752

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