130 replies to this topic

[garw]

I would like know what the relationship is between abs and power in the vx Comparing dyno experience with other cars is wrong As they can have traction control and canbus The abs in the vx cannot from what I see tell the ecu anything other than how fast It's going . The tuners would know if there is a specific map for Power vs speed So by taking the ABS fuse out there would have been no speed signal That could suggest a speed limiter may have been reached on the dyno The ecu reduced the power at that high speed More food for thought

[LordRagnar]

Car was standard. Max torque is 350 for the VXT engine so 300 is about spot on. It has a brand new filter

Edited by LordRagnar, 22 March 2017 - 07:19 PM.

[garw]

300 nm would be spot on I think this figure was confused with lb/ft Which would be very high

[slindborg]

In my past life, no speed signal into a power train controller (over CAN, not canbus you're new here so I'll be nice) would default the torque map into top gear and make the assumption of speed limitation based on engine speed. So yes, it 'could' impact the dunno reading but given the antiqueness of the vxt powetrain id doubt it. To quote one of the steves at track and road, putting a car on a dyno is like driving it through space... any weirdness that you might not feel on the road will be shown on the rollers

[garw]

What's wrong with canbus:-) Was it my grammar :-) I went to a Welsh school so they didn't do me any favours , Assuming im the newbie you refer to .

[chickendippers]

I'd say 300lb ft is about spot on to be honest, always worth taking dyno figures with a pinch of salt though

[P11 COV]

Is  300lbs/ft not quite a high figure considering the power is 'only' 238hp?   300 is more in the region of a stage 4 car and would normally need a uprated clutch. 238bhp is more like a stage 1.5 ish so would expect torque in the region of 240 -250. (Based on Courtenays Sport tuning figures.

[garw]

300nm = 221 lb/ft

[scw02102]

I can confirm 100% that the ABS can interfere with bhp reading on a dyno

 

My car was on the dyno 3 weeks ago and wouldnt make over 228bhp yet the fuel and mapping said totally different. The mapper rabbid (rich) said this happens on the Astra's sometimes pop the ABS fuse.

I looked at him and was like yeah right. Anyway I removed the fuse changed nothing on the car/map and instantly pulled 268bhp without touching anything. 

 

I cant remember why but its something to do with ABS and being on the dyno and the ecu does something that effects the power or timing

 

Makes no difference on the road just on the dyno

Edited by scw02102, 22 March 2017 - 09:02 PM.

[scw02102]

Is  300lbs/ft not quite a high figure considering the power is 'only' 238hp?   300 is more in the region of a stage 4 car and would normally need a uprated clutch. 238bhp is more like a stage 1.5 ish so would expect torque in the region of 240 -250. (Based on Courtenays Sport tuning figures.

 

This dyno is an accurate one I dyno at this one and 3 days before at Courtney Sport. 

Courtney was over reading by 20bhp so a 238bhp on this rollers is well over 250bhp at CS 

 

I also know a car that made 404bhp on one rollers yet only 350bhp on the above rollers. 

[james4563]

With regard to torque, my stage 4 made 360lbs/ft, so 300lbs does seem a little high for stage 1-2. I'm pretty sure standard vxt only has about 190lbs/ft. So 300 is quite an increase. Can't comment about the abs issue other than my dyno was done on a 4wd roller and the abs fuse wasn't removed.

[slindborg]

What's wrong with canbus:-) Was it my grammar :-) I went to a Welsh school so they didn't do me any favours , Assuming im the newbie you refer to .

Not a grammar issue, more that canbus is a diabolical marketing term for plain ole CAN

[NOSBandit]

Why don't people post the dyno graphs, then everyone can see the results! Sent from my SM-G935F using Tapatalk

[LordRagnar]

Defo 300lbs/ft


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[LordRagnar]

Defo 300lbs/ft


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[LordRagnar]

Not sure why that posted twice Sent from my iPhone using Tapatalk

[NOSBandit]

Can you include the curves as well, it's always interesting to see the whole sheet Sent from my SM-G935F using Tapatalk

[mbes2]

So.. 300lbs/ft.. you best save for a clutch.. (paddle) must pull well Two vxt's needing the abs fuse removed on the same dyno setup..

[chickendippers]

300lb ft should be fine on standard clutch, they generally have an easy life in a VX. Closer to 350lb ft you may get issues, but then again a C20LET clutch kit only costs about £150 and will be more than sufficient. No need for the expense of a paddle clutch.

Edited by chickendippers, 22 March 2017 - 11:27 PM.

[ditonics]

I'm thoroughly confused by this thread.

Me too. Logically i question the original readings.