Discussion
Guy's the results as promised.
Slightly disappointing that the VXR didn't make its claimed power (383ps/1.01=379bhp)
So it was about 20bhp down. Though I understand from dyno owner Charlie that thats typical for any model of RO' to be down on manufacturers claim. (Now if I bought a four wheel car and it came with only three, Vauxhall would replace it under warrenty! wonder if they keep any horsepowers in there parts bin!)
The TVR incidently, despite what most of us expected, exceeded the manufacturers claim and produced 351bhp at the flywheel! infact it had 291bhp at the road wheels. Two bhp more than the VXR that is supposed to have 30bhp more!
Both cars are stock, but it explains his performance at Santapod the other day.
Slightly disappointing that the VXR didn't make its claimed power (383ps/1.01=379bhp)
So it was about 20bhp down. Though I understand from dyno owner Charlie that thats typical for any model of RO' to be down on manufacturers claim. (Now if I bought a four wheel car and it came with only three, Vauxhall would replace it under warrenty! wonder if they keep any horsepowers in there parts bin!)
The TVR incidently, despite what most of us expected, exceeded the manufacturers claim and produced 351bhp at the flywheel! infact it had 291bhp at the road wheels. Two bhp more than the VXR that is supposed to have 30bhp more!
Both cars are stock, but it explains his performance at Santapod the other day.
Yeah as you say its all down to algorythems, or something, not sure what music has to do with it though!
This month's TG Mag, featured there long termer Astra VXR on the rollers at the same dyno as above, and that to was 20bhp down on manufacturers claimed output.
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
This month's TG Mag, featured there long termer Astra VXR on the rollers at the same dyno as above, and that to was 20bhp down on manufacturers claimed output.
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
Boyce said:
Yeah as you say its all down to algorythems, or something, not sure what music has to do with it though!
This month's TG Mag, featured there long termer Astra VXR on the rollers at the same dyno as above, and that to was 20bhp down on manufacturers claimed output.
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
This month's TG Mag, featured there long termer Astra VXR on the rollers at the same dyno as above, and that to was 20bhp down on manufacturers claimed output.
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
Absolutely the best way, measure the gains.
1. You need a BIG bonnet, but run it in the UP positon.
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Very sensible and the real value of a RR (other than for chat down the pub)
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Boyce said:
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
Very sensible and the real value of a RR (other than for chat down the pub)
Smiler. said:
1. You need a BIG bonnet, but run it in the UP positon.
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Very sensible and the real value of a RR (other than for chat down the pub)
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Boyce said:
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
Very sensible and the real value of a RR (other than for chat down the pub)
Well its got a big bonnet, and it was up, as for the rest its just me who needs a cup of tea.
Anyone know if an aftermarket complete filter box replacement is available, i.e a cone type filter from Greens or K&N or similar.
I'm sure the inlet is way restrictive, gonna be in the states in the next few weeks if I can get one there ?
Boyce said:
Smiler. said:
1. You need a BIG bonnet, but run it in the UP positon.
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Very sensible and the real value of a RR (other than for chat down the pub)
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Boyce said:
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
Very sensible and the real value of a RR (other than for chat down the pub)
Well its got a big bonnet, and it was up, as for the rest its just me who needs a cup of tea.
Anyone know if an aftermarket complete filter box replacement is available, i.e a cone type filter from Greens or K&N or similar.
I'm sure the inlet is way restrictive, gonna be in the states in the next few weeks if I can get one there ?
Think there was a cone type filter on the wortec stand last night
intake is very restrictive as standard - loads of options available though the K&N Typhoon type thing is generally not well regarded as it draws a fair bit of heat in from the engine bay. For not that much more money the OTRCAI solution offers far better results. Simple thing you can do to improve things - K&N or similiar panel filter in the standard airbox and the extra hole mod - do a search on here. Not sure what size throttle body on the 5.7 VXR - larger one of those if possible (up to around 90mm) and mafless/larger maf will both help but require tune to work properly, FAST intake manifold - around 500 quid from States + fitting and tune and throttle body etc etc. Then you're looking at heads to improve things further and the costs really start to climb but so do the performance figures.
well_fans said:
intake is very restrictive as standard - loads of options available though the K&N Typhoon type thing is generally not well regarded as it draws a fair bit of heat in from the engine bay. For not that much more money the OTRCAI solution offers far better results. Simple thing you can do to improve things - K&N or similiar panel filter in the standard airbox and the extra hole mod - do a search on here. Not sure what size throttle body on the 5.7 VXR - larger one of those if possible (up to around 90mm) and mafless/larger maf will both help but require tune to work properly, FAST intake manifold - around 500 quid from States + fitting and tune and throttle body etc etc. Then you're looking at heads to improve things further and the costs really start to climb but so do the performance figures.
Is the OTRCAI, the system/method you describe here, or is it ans aftermarket kit from somewhere?
The extra hole mod, is there some marking in the airbox to show where to cut ?
Not sure what size the MAF is anyone know ?
Where do you get a larger MAF from and are they expensive?
Sorry for all the questions but I need to find my missing 20BHP !!
Cheers
crisisjez said:
Boyce said:
Smiler. said:
1. You need a BIG bonnet, but run it in the UP positon.
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Very sensible and the real value of a RR (other than for chat down the pub)
2. You need 200psi in the tyres.
3. You need to stick the air intake probe in a cup of tea before the run.
4. You need to stop listening to me now.
Boyce said:
To be honest all I wanted to achieve was a base line to see any improvement with a programme of mods.
Very sensible and the real value of a RR (other than for chat down the pub)
Well its got a big bonnet, and it was up, as for the rest its just me who needs a cup of tea.
Anyone know if an aftermarket complete filter box replacement is available, i.e a cone type filter from Greens or K&N or similar.
I'm sure the inlet is way restrictive, gonna be in the states in the next few weeks if I can get one there ?
Think there was a cone type filter on the wortec stand last night
Anyone shed any light on the cone filter on the wortec stand, Price gains etc ?
Cheers Jez
Edited by Boyce on Wednesday 21st March 12:34
Boyce said:
This month's TG Mag, featured there long termer Astra VXR on the rollers at the same dyno as above, and that to was 20bhp down on manufacturers claimed output.
Neither me nor TG mag were suprised when it did'nt make the power, considering the standard VXR Astras struggle to make it either. Both the MK5 Golf Gti and Ford Focus ST tested on the same day as the Astra by Top gear (but featured in an earlier issue) made claimed power.
My vote is to use RWHP figures and sod the FW guesstimates. Thats what the US and Oz do, cant see why we should be any different.
Interesting info, thanks for posting up the graphs. It would be good to have a sticky or something with all the dyno results and mods listed in it for reference. BO55?
Its pity there is only one forum for Holden stuff, we could do with a few especially with the VXR8 coming on.
Dyno results, Technical, Monaros,VT-VZ, VE, General Chat. Or similar.
Interesting info, thanks for posting up the graphs. It would be good to have a sticky or something with all the dyno results and mods listed in it for reference. BO55?
Its pity there is only one forum for Holden stuff, we could do with a few especially with the VXR8 coming on.
Dyno results, Technical, Monaros,VT-VZ, VE, General Chat. Or similar.
An otrcai is only about 1ft straight shot from the front of the bonnet to the intake, whereas the stock one twists and turns through the engine bay for a good few feet.
They get my vote for sure. Guys in Oz can get up to 330rwhp from stock 5.7L engines with the otrcai, headers, exhaust and a tune. A nicely tuned VXR should get to 350rwhp stock engine.
I think LeSerge has one, as do I. Duncan from Wortec tried a few, not sure if he runs one now though. I think the orssom one is pretty good, which is what Roger will be stocking soon/now.
Of course if you are going forced induction dont bother with one as you will have to throw it away (or sell it off).
They get my vote for sure. Guys in Oz can get up to 330rwhp from stock 5.7L engines with the otrcai, headers, exhaust and a tune. A nicely tuned VXR should get to 350rwhp stock engine.
I think LeSerge has one, as do I. Duncan from Wortec tried a few, not sure if he runs one now though. I think the orssom one is pretty good, which is what Roger will be stocking soon/now.
Of course if you are going forced induction dont bother with one as you will have to throw it away (or sell it off).
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